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Monolithic Power Systems

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FY2010 Annual Report · Monolithic Power Systems
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2010 ANNUAL REPORT ON FORM 10-K

To our Shareholders, Customers, Partners and Employees: 

2010 was a year of extremes.  The 2009 recession ended abruptly and the result of our aggressive strategy to buy market share came 
home immediately as we entered 2010.   Demand for our products outpaced supply by more than 40% and we spent most of the year 
struggling  to  keep  our  customers  satisfied.    However,  just  as  quickly  as  business  ramped-up,  by  the  end  of  the  year,  end  market 
demand abruptly shrunk by more than 30%.   2010 was a tumultuous year for the industry—the consumer market experienced extreme 
supply and demand swings within the same year.   

Despite the challenges we faced throughout the year, we grew over 32% to a record $218M revenue, earnings per share (EPS) grew 
76% to $1.18, and our cash grew to $196.9M, or just over $5 per share.   And, in an effort to continue to bring shareholder value, we 
issued  a  $70M  stock  repurchase  program.      However,  2010  was  also  a  year  confronted  with  new  challenges.        During  the  2009 
recession, we bought market share that quickly turned into revenue in early 2010.  Keep in mind that the economic conditions were 
unclear at the time and it looked as if the recession would extend into 2010.  As a result of our increased consumer business, our gross 
margin  dropped  3.7%  to  55.5%  year-over-year.    Even  though  we  supplied  product  to  our  customers,  for  most  of  the  year  we 
experienced capacity constrained shortages and some customers were forced to seek alternative suppliers.   In summary, 2010 was a 
challenging year for MPS and we’re committed to continuous improvement.   

With new corporate initiatives in place to forge a stronger MPS, 2011 will be a rebuilding year.  Let me highlight these initiatives that 
we set in motion in 2010: 

1.  Execute  to  2011  growth  plan  and  maintain  gross  margin  in  existing  and  new  markets  to  make  up  for  the  lost 

customer revenue from 2010.  

2.  Balance  market  segment  revenue  through  diversification  into  higher  end  markets  that  value  our  unique,  small 

footprint and high output current (i.e., current density).  

 
 
 
 

Servers & enterprise storage 
Telecom/Datacom 
Industrial 
Lighting 

3.  Continue capacity expansion to meet our growth objective:  40% fab capacity growth in 2010 from existing two 

4. 

Foundries and another 50% planned by the end of 2011 with the addition of a third Foundry. 
Improve on-time delivery and customer satisfaction: Install supply chain management (SCM) and CRM software 
in 2011. 

Technology  Highlights
:    MPS  is  in  production  with  our  proprietary  Mesh  ConnectTM  manufacturing  technology  that  provides 
improved efficiency and reduces cost by eliminating expensive gold bond wires.  We also released our next generation proprietary, 
high-voltage DMOS process that reduces the Rds(on) per unit area by 40% to provide superior power-density solutions. 

New Product and Market Highlights
:  Despite a year of supply and capacity constraints, we were able to release more than 55 new 
products and entered into two significant new markets—WLED AC-input lighting and ACDC converters.  We also released our first 
fully integrated, monolithic, 12V, 25A Intelli-Phase DCDC buck converter that targets high-current point-of-load applications.  This is 
truly  a  leading-edge  product  that  is  opening  doors  into  large  telecom/datacom  companies  and  is  a  testament  to  our  initiative  to 
diversify into new markets. 

In 2011, we will focus on establishing MPS as a leader in the energy-saving market segment.  There are new demands for extreme 
high-efficiency power conversion products in the cloud computing, industrial, automotive, and lighting markets.  MPS possesses the 
enabling technologies for high-current and high-voltage applications to make a significant impact in this market.  We will introduce a 
few breakthrough products in 2011 that we believe will redefine the standard in the industry.  

In summary, I continue to be excited about our future.  We increased our served available market by more than $2.5B through new 
product introductions and we continue to invest in R&D to maintain leadership technology.  2011 is a year to regroup and come out 
stronger through execution of our initiatives and a focus on innovative energy saving power solutions for the future. 

Michael R. Hsing 
President and Chief Executive Officer 

 
 
 
 
 
 
 
 
 
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UNITED STATES 
SECURITIES AND EXCHANGE COMMISSION 
Washington, D.C. 20549 

FORM 10-K  

(Mark One) 
 

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE 
ACT OF 1934 

For the fiscal year ended December 31, 2010 

or 

 

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE 
ACT OF 1934 

Commission file number: 000-51026  

Monolithic Power Systems, Inc. 
(Exact name of registrant as specified in its charter)  

Delaware 
(State or other jurisdiction of 
incorporation or organization) 

77-0466789 
(I.R.S. Employer 
Identification Number) 

6409 Guadalupe Mines Road, San Jose, CA 95120 (408) 826-0600 
(Address of principal executive offices, including zip code and telephone number) 

Securities registered pursuant to Section 12(b) of the Act: 

Title of each class 
Common Stock, $0.001 Par Value 

Name of each exchange on which registered 
The NASDAQ Global Select Market 

Securities registered pursuant to Section 12(g) of the Act: 
None 

Indicate  by  check  mark  if  the  registrant  is  a  well-known  seasoned  issuer,  as  defined  in  Rule  405  of  the 

Securities Act of 1933. Yes   No 

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of 

the Securities Exchange Act of 1934 (the “Exchange Act”). Yes   No 

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) 
of the Exchange Act during the preceding 12 months (or for such shorter period that the registrant was required to file 
such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes      No    

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, 
if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 
of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and 
post such files).     Yes      No    

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Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained 
herein, and will not be contained, to the best of the registrant’s knowledge, in definitive proxy or information statements 
incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated 
filer  or  a  smaller  reporting  company.  See  the  definitions  of  “large  accelerated  filer,”  “accelerated  filer”  and  “smaller 
reporting company” in Rule 12b-2 of the Exchange Act. 

Large accelerated filer           Accelerated filer           Non-accelerated filer            Smaller reporting 

company   

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange 

Act).  Yes   No 

The  number  of  shares  of  the  registrant’s  stock  outstanding  as  of  June  30,  2010  was  36,545,581.  The  closing 
price  of  the  registrant’s  common  stock  on  the  Nasdaq  Global  Select  Market  as  of  June  30,  2010  was  $17.86.  The 
aggregate market value of the voting and non-voting common equity held by non-affiliates of the registrant based upon 
the closing price of the Common Stock on the Nasdaq Global Select Market on June 30, 2010 was $373,041,070.* 

There were 35,315,748 shares of the registrant’s common stock issued and outstanding as of February 22, 2011. 

DOCUMENTS INCORPORATED BY REFERENCE 

Portions of the registrant’s Proxy Statement for the registrant’s 2011 Annual Meeting of Stockholders are 

incorporated by reference into Part III of this Form 10-K to the extent stated herein.  The Proxy Statement will be filed 
within 120 days of the registrant’s fiscal year ended December 31, 2010.  

*  Excludes 15,658,623 shares of the registrant’s common stock held by executive officers, directors and stockholders 
whose ownership exceeds 5% (“affiliates”) of the Common Stock outstanding at June 30, 2010.  Exclusion of such 
shares should not be construed to indicate that any such person possesses the power, direct or indirect, to direct or 
cause  the  direction  of  the  management  or  policies  of  the  registrant  or  that  such  person  is  controlled  by  or  under 
common control with the registrant. 

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72 

MONOLITHIC POWER SYSTEMS, INC. 
TABLE OF CONTENTS 

Item 1. 

Business 

Executive Officers of the Registrant 
Risk Factors 
Unresolved Staff Comments 
Properties 
Legal Proceedings 

PART I 

PART II 

Item 1A 
Item 1B 
Item 2. 
Item 3. 

Item 5. 

Item 6. 
Item 7. 
Item 7A. 
Item 8. 
Item 9. 
Item 9A. 
Item 9B. 

Market for the Registrant's Common Equity, Related Stockholder Matters and Issuer 
Purchases of Equity Securities 
Selected Financial Data 
Management's Discussion and Analysis of Financial Condition and Results of Operations 
Quantitative and Qualitative Disclosures About Market Risk 
Financial Statements and Supplementary Data 
Changes in and Disagreements with Accountants on Accounting and Financial Disclosure 
Controls and Procedures 
Other Information 

PART III 

Item 10. 
Item 11. 
Item 12. 

Item 13. 
Item 14. 

Directors, Executive Officers and Corporate Governance 
Executive Compensation 
Security Ownership of Certain Beneficial Owners and Management and Related 
Stockholder Matters 
Certain Relationships and Related Transactions, and Director Independence 
Principal Accounting Fees and Services 

Item 15. 

Exhibits, Financial Statement Schedules 
Signatures 

PART IV 

Except  as  the  context  otherwise  requires,  the  terms  “Monolithic  Power  Systems”,  “MPS”,  “Registrant”, 
“Company”, “we”, “us”, or “our” as used herein are references to Monolithic Power Systems, Inc. and its consolidated 
subsidiaries. 

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FORWARD-LOOKING STATEMENTS 

This  annual  report  on  Form  10-K  and  the  documents  incorporated  herein  by  reference  contain  forward-looking 
statements  within  the  meaning  of  Section  27A  of  the  Securities  Act  of  1933,  as  amended,  and  Section  21E  of  the 
Securities Exchange Act of 1934, as amended, that have been made pursuant to and in reliance on the provisions of the 
Private Securities Litigation Reform Act of 1995. These statements include among other things, statements concerning: 

• 
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• 
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• 
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• 
• 
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• 

the above-average industry growth of product and market areas that we have targeted, 
our plan to introduce additional new products within our existing product families as well as in new product 
categories and families, 
our belief that we will continue to incur significant legal expenses that vary with the level of activity in each 
of our legal proceedings, 
the impact of our outstanding litigation and changing  market conditions on the revenue  we derive from our 
CCFL product line, 
the effect of auction-rate securities on our liquidity and capital resources, 
the  application  of  our  products  in  the  computer,  consumer  electronics,  and  communications  markets 
continuing to account for a majority of our revenue, 
estimates of our future liquidity requirements, 
the cyclical nature of the semiconductor industry, 
protection of our proprietary technology, 
near term business outlook for 2011, 
the factors that we believe will impact our ability to achieve revenue growth, 
the outcome of the IRS audit of our tax return for the tax years ended December 31, 2006 and 2007, 
the percentage of our total revenue from various market segments, and 
the factors that differentiate us from our competitors. 

In  some  cases,  words  such  as  “would,”  “could,”  “may,”  “should,”  “predict,”  “potential,”  “targets,”  “continue,” 
“anticipate,” “expect,” “intend,” “plan,” “believe,” “seek,” “estimate,” “project,” “forecast,” “will,” the negative of these 
terms or other variations of such terms and similar expressions relating to the future identify forward-looking statements. 

All forward-looking statements are based on our current outlook, expectations, estimates, projections, beliefs and plans 
or  objectives  about  our  business  and  our  industry.  These  statements  are  not  guarantees  of  future  performance  and  are 
subject to risks and uncertainties. Actual events or results could differ materially and adversely from those expressed in 
any such forward-looking statements. 

Risks and uncertainties that could cause actual results to differ materially include those set forth throughout this annual 
report on Form 10-K and, in particular, in the section entitled “Item 1A. Risk Factors”. 

Except  as  required  by  law,  we  disclaim  any  duty  to  and  undertake  no  obligation  to  update  any  forward-looking 
statements, whether as a result of new information relating to existing conditions, future events or otherwise or to release 
publicly  the  results  of  any  future  revisions  we  may  make  to  forward-looking  statements  to  reflect  events  or 
circumstances  after  the  date  hereof  or  to  reflect  the  occurrence  of  unanticipated  events.  Readers  are  cautioned  not  to 
place undue reliance on such statements, which speak only as of the date of this annual report on Form 10-K. Readers 
should carefully review future reports and documents that we file from time to time with the Securities and Exchange 
Commission, such as our quarterly reports on Form 10-Q and any current reports on Form 8-K. 

ITEM 1.                BUSINESS 

General 

PART I 

Monolithic  Power  Systems  is  a  fabless  semiconductor  company  that  designs,  develops  and  markets  proprietary, 
advanced  analog  and  mixed-signal  semiconductors.  We  combine  advanced  process  technology  with  our  highly 
experienced analog designers to produce high-performance power  management integrated circuits (ICs) for DC to DC 
converters, LED drivers, Cold Cathode Fluorescent Lamp (CCFL) backlight controllers, Class-D audio amplifiers, and 
other Linear ICs. Our products are used extensively in computing and network communications products, flat panel TVs, 

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set  top  boxes  and  a  wide  variety  of  consumer  and  portable  electronics  products.  We  partner  with  world-class 
manufacturing organizations to deliver top quality, ultra-compact, high-performance solutions through productive, cost-
efficient channels. Founded in 1997 and headquartered in San Jose, California, we have expanded our global presence 
with offices in Taiwan, China, Korea, Japan, and Europe, which operate under MPS International, Ltd. 

Industry Overview 

Semiconductors  comprise  the  basic  building  blocks  of  electronic  systems  and  equipment.  Within  the  semiconductor 
industry,  components  can  be  classified  either  as  discrete  devices,  such  as  individual  transistors,  or  as  ICs,  in  which  a 
number of transistors and other elements are combined to form a more complicated electronic circuit. ICs can be further 
divided  into  three  primary  categories:  digital,  analog,  and  mixed-signal.  Digital  ICs,  such  as  memory  devices  and 
microprocessors,  can  store  or  perform  arithmetic  functions  on  data  that  is  represented  by  a  series  of  ones  and  zeroes. 
Analog  ICs,  in  contrast,  handle  real  world  signals  such  as  temperature,  pressure,  light,  sound,  or  speed.  In  addition, 
analog ICs also perform power management functions, such as regulating or converting voltages, for electronic devices. 
Mixed-signal  ICs  combine  digital  and  analog  functions  onto  a  single  chip  and  play  an  important  role  in  bridging  real 
world phenomena to digital systems. 

Analog and Mixed-Signal Markets.  We focus on the market for ‘high performance’ analog and mixed-signal ICs. ‘High 
performance’ products generally are differentiated by functionality and performance factors which include integration of 
higher  levels  of  functionality  onto  a  single  chip,  greater  precision,  higher  speed  and  lower  heat  and  noise.  There  are 
several key factors that distinguish analog and mixed-signal IC markets from digital IC markets and in particular the high 
performance  portion  of  the  analog  and  mixed  signal  IC  market.  These  factors  include  longer  product  life 
cycles, numerous  market  segments,  technology that  is  difficult  to  replicate,  relative  complexity  of  design  and  process 
technology, importance of experienced design engineers, lower capital requirements and diversity of end markets.  We 
have, however, targeted product and market areas that we believe have the ability to offer above average industry growth 
over the long term. 

Products and Applications 

We  currently  have  three  primary  product  families  that  address  multiple  applications  within  the  computing,  consumer 
electronics,  communications,  and  industrial/automotive  markets.  Our  products  are  differentiated  with  respect  to  their 
high  degree  of  integration  and  strong  levels  of  accuracy  and  efficiency,  making  them  cost-effective  relative  to  many 
competing solutions. These product families include: 

Direct Current (DC) to DC Converters. DC to DC converter ICs are used to convert and control voltages within a broad 
range of electronic systems, such as portable electronic devices, wireless LAN access points, computers, set top boxes, 
TVs and monitors, automobiles and medical equipment. We believe that our DC to DC converters are differentiated in 
the  market, particularly  with  respect to their high degree of integration, high voltage operation, high load current, and 
high  switching  speed  in  a  small  footprint.  These  features  are  important  to  our  customers  as  they  result  in  fewer 
components,  a  smaller  form  factor,  more  accurate  regulation  of  voltages,  and,  ultimately,  lower  system  cost  and 
increased reliability through the elimination of many discrete components and power devices. 

Lighting  Control  Products  and  AC/DC  Offline  Solutions.  Lighting  control  ICs  are  used  in  backlighting  and  general 
illumination products. Lighting control ICs for backlighting are used in systems that provide the light source for LCD 
panels  typically  found  in  notebook  computers,  LCD  monitors,  car  navigational  systems,  and  LCD  televisions. 
Backlighting  solutions  are  typically  either  WLED  lighting  sources  or  cold  cathode  fluorescent  lamps  (CCFL).  WLED 
lighting  control  ICs  step-up  or  step-down  a  DC  voltage,  or  convert  from  an  AC  line  voltage  supplied  by  the  utility 
company  (also  called  AC/DC  Offline)  and  provide  efficient  precision  power  and  protection  to  a  LED  string  or  to 
multiple LED strings. The CCFL ICs function by converting low-voltage direct current (DC) or battery voltage to high-
voltage alternating current (AC). We believe our CCFL ICs were the first to utilize a full bridge resonant topology that 
allows for high efficiency, extended lifetimes for cold cathode fluorescent lamps (CCFLs), and lower signal interference 
with adjacent components. The full bridge topology is now the industry standard for these products. 

In addition to AC/DC offline solutions for lighting illumination applications, MPS also offers AC/DC power conversion 
solutions for a diverse number of end products that plug into a wall outlet. 

Audio  Amplifiers.  Audio  amplifier  ICs  are  used  to  amplify  sound  produced  by  audio  processors.  We  currently  offer 
Class-D  audio  amplifiers,  which  are  well-suited  for  applications  that  require  both  a  small  form  factor  and  high  power 

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efficiency, such as plasma televisions, LCD televisions and DVD players. With today’s systems becoming smaller and 
utilizing  larger  amounts  of  power,  solution  sizes  and  the  management  of  heat  dissipation  are  becoming  increasingly 
important  to  the  overall  system  design.  The  high  degree  of  power  efficiency  and  small  form  factor  provided  by  our 
Class-D  audio  amplifiers  allows  system  vendors  to  significantly  reduce  heat  dissipation,  eliminating  the  costly  and 
sizable fans and heat sinks traditionally required by audio amplifier ICs. These features enable our customers to achieve 
their design and cost objectives without sacrificing sound quality.   

We currently target our products at the consumer electronics, communications and computing markets, with the 
consumer market representing the largest portion of our revenue. 

The following is a brief summary of our product family solutions for various applications. For each of these applications, 
we  are  currently  shipping  product  or  have  design  wins,  which  are  decisions  by  original  equipment  manufacturers,  or 
OEMs, or original design manufacturers, or ODMs, to use our ICs: 

WLED 
Lighting 
Illumination 
(non-
backlight) 

Application 

LCD 
Backlight 
(Inverters 
or 
WLED) 

DC to DC 
Converters 
(Buck & 
Boost) 

µP Reset & 
Supervisory 

Audio 
Amplifiers 

AC/DC 
Offline 

Chargers 
(Switching 
& Linear) 

Current 
Limit 
Switches 

Computing 
  Computers and PDA  
    devices 
  LCD Monitors 
  Disk Drives/ Storage  
    Networks 
Consumer Electronics     
  LCD TV Displays 
  Plasma TV Displays 
  Set Top Boxes 
  Blu-Ray & DVD  
    Players 
  Digital Still Cameras     
  Commercial &  
    Industrial Bulb &    
    CFL Replacement 
  GPS and  
    Infotainment  
    systems 
Communications 
  Cellular Handsets 
  Networking  
    Infrastructure 
  VOIP 
  Wireless Access     
    Points 

X 

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X 

We  derive  a  majority  of  our  revenue  from  the  sales  of  our  DC  to  DC  converter  IC  product  family  to  the  computing, 
consumer electronics and communications markets.  In the future, we will continue to introduce additional new products 
within our existing product families, such as high current, high voltage, small form factor switching voltage regulators, 
as  well  as  expand  our  newer  product  families  in  battery  chargers,  voltage  references  and  low  dropout  regulators.  Our 
ability to achieve revenue growth will depend in part upon our ability to enter new market segments, gain market share, 
grow in regions outside of Greater China, expand our customer base and successfully secure manufacturing capacity. 

Please  refer  to  the  table  showing  our  revenue  by  product  family  in  the  section  entitled  “Item  7.  Management’s 
Discussion and Analysis of Financial Condition and Results of Operations – Results of Operations”. 

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Customers, Sales, and Marketing 

We sell our products through third party distributors, value-added resellers and directly to OEMs, ODMs, and electronic 
manufacturing service (EMS) providers. Our third party distributors are subject to distribution agreements with us which 
allow the distributor to sell our products to end customers and other resellers.  Distributors may distribute our products to 
end  customers  which  include  OEMs,  ODMs  or  EMS  providers.  Our  value-added  resellers  may  second  source  our 
products and provide other services to customers. ODMs typically design and manufacture electronic products on behalf 
of OEMs, and EMS providers typically provide manufacturing services for OEMs and other electronic product suppliers. 
The following is a summary for the years ended December 31, 2010, 2009 and 2008 of those customers that accounted 
for more than 10% of our total revenue in one or more of these years: 

Customer 
A 
B 
C 
D 

Revenue 
Year ended December 31, 
2009 

2008 

2010 

14 %     
*        
*        
*        

13 %     
10 %     
10 %     
*      

20 %  
10 %  
*   
*   

Current distribution agreements with several of our major distributors provide that each distributor shall have the non-
exclusive right to sell and use its best efforts to promote and develop a market for our products in several countries in 
Asia.  These  agreements  may  be  terminated  by  either  us  or  the  distributor  on  up  to  three  months’  notice.  These 
agreements  provide  that  payment  for  purchases  from  us  will  generally  occur  within  30  to  45  days  from  the  date  of 
invoice.  In addition, we allow for limited stock rotation in certain agreements. 

We have sales offices located in the United States, Taiwan, China, Korea and Japan and have marketing representatives 
in Europe. Our products typically require a highly technical sales and applications engineering effort where we assist our 
customers in the design and use of our products in their application.  We maintain a staff of applications engineers who 
work directly with our customers’ engineers in the development of their systems electronics containing our products. 

Because our sales are billed and payable in United States dollars, our sales are not directly subject to fluctuating currency 
exchange rates. However, because 87% of our revenue in 2010 was attributable to direct or indirect sales to customers in 
Asia, changes in the relative value of the dollar may create pricing pressures for our products. 

Our  sales  are  made  primarily  pursuant  to  standard  individual  purchase  orders.  Our  manufacturing  lead  times  are 
generally  4  to  12  weeks  and  we  often  build  inventory  in  advance  of  customer  orders  based  on  our  forecast  of  future 
customer orders. This subjects us to certain risks, most notably the possibility that sales will not meet our forecast, which 
could  lead  to  inventories  in  excess  of  demand.  If  excess  inventory  exists,  it  may  be  necessary  for  us  to  sell  it  at  a 
substantial discount or dispose of it altogether, either of which would negatively affect our profit margins. 

We operate in the cyclical semiconductor industry where there is seasonal demand for certain of our products. While we 
are not and will not be immune from current and future industry downturns, we have targeted product and market areas 
that we believe have the ability to offer above average industry performance over the long term. 

Research and Development 

We  have  assembled  a  qualified  team  of  engineers  in  the  United  States,  China  and  Europe  with  core  competencies  in 
analog  and  mixed-signal  design.  Through  our  research  and  development  efforts,  we  have  developed  a  collection  of 
intellectual  property  and  know-how  that  we  are  able  to  leverage  across  our  products  and  markets.  These  include  the 
development  of  high  efficiency  power  devices,  the  design  of  precision  analog  circuits,  expertise  in  mixed-signal 
integration and the development of proprietary semiconductor process technologies. 

Our  research  and  development  efforts  are  generally  targeted  at  three  areas:  systems  architecture,  circuit  design  and 
implementation, and process technology. In the area of systems architecture, we are exploring new ways of solving our 
customers’  system  design  challenges  and  are  investing  in  the  development  of  systems  expertise  in  new  markets  and 
applications that align  well  with our core capabilities. In the area of circuit design and implementation, our initiatives 
include expanding our portfolio of products and adding new features to our products. 

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Please refer to the discussion of the amount spent on research and development during each of the last three fiscal years 
in the section entitled “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations 
– Results of Operations – Research and Development”. In the area of process technology, we are investing research and 
development  resources  to  provide  leading-edge  analog  power  processes  for  our  next  generation  of  integrated  circuits. 
Process technology is a key strategic component to our future growth. 

Patents and Intellectual Property Matters 

We  rely  on  our  proprietary  technologies,  which  include  both  our  proprietary  circuit  designs  for  our  products  and  our 
proprietary  manufacturing  process  technologies.  Our  future  success  and  competitive  position  depend  in  part  upon  our 
ability to obtain and maintain protection of our proprietary technologies. 

In general, we have elected to pursue patent protection for aspects of our circuit designs that we believe are patentable 
and to protect our manufacturing process technologies by maintaining those process technologies as trade secrets. As of 
January  18,  2011  we  had  approximately  84  patents  issued  and  pending,  of  which  68  have  been  issued  in  the  United 
States.  Our  U.S.  issued  patents  are  scheduled  to  expire  at  various  times  through  October  2028  and  our  other  issued 
patents are scheduled to expire at various times through August 2027. Our patents are material to our business, but we do 
not rely on any one particular patent for our success. We also rely on a combination of nondisclosure agreements and 
other  contractual  provisions,  as  well  as  our  employees’  commitment  to  confidentiality  and  loyalty,  to  protect  our 
technology, know-how, and processes. We have entered into a patent license agreement with another integrated circuit 
company,  which  is  a  value-added  reseller,  pursuant  to  which  we  have  granted  this  company  a  license  (with  certain 
limited  sublicense rights)  under certain of our patents  to  make, use, and sell certain of this company’s own integrated 
circuit products for a period of two years ending in 2011, and for which this company is obligated to pay us royalties 
based on sales of those products. We also seek to register certain of our trademarks as we deem appropriate. We have not 
registered  any  of  our  copyrights  and  do  not  believe  registration  of  copyrights  is  material  to  our  business.  Despite 
precautions  that  we  take,  it  may  be  possible  for  unauthorized  third  parties  to  copy  aspects  of  our  current  or  future 
technology or products or to obtain and use information that we regard as proprietary. There can be no assurance that the 
steps we take will be adequate to protect our proprietary rights, that our patent applications will lead to issued patents, 
that  others  will  not  develop  or  patent  similar  or  superior  products  or  technologies,  or  that  our  patents  will  not  be 
challenged, invalidated, or circumvented by others. Furthermore, the laws of the countries in which our products are or 
may be developed, manufactured or sold may not protect our products and intellectual property rights to the same extent 
as laws in the United States. Our failure to adequately protect our proprietary technologies could harm our business. 

The semiconductor industry is characterized by frequent claims of infringement and litigation regarding patent and other 
intellectual property rights. For a more complete description of our legal matters, please read the section entitled Item 3. 
Legal Proceedings and Note 10 to our consolidated financial statements. Patent infringement is an ongoing risk, in part 
because  other  companies  in  our  industry  could  have  patent  rights  that  may  not  be  identifiable  when  we  initiate 
development efforts. Litigation may be necessary to enforce our intellectual property rights, and we may have to defend 
ourselves  against  infringement  claims.  Any  such  litigation  could  be  very  costly  and  may  divert  our  management 
resources. Further, we have agreed to indemnify certain of our customers and a supplier in some circumstances against 
liability from infringement by our products. In the event any third party were to make an infringement claim against us 
or our customers, we could be enjoined from selling selected products or could be required to indemnify our customers 
or  supplier  or  pay  royalties  or  other  damages  to  third  parties.  If  any  of  our  products  is  found  to  infringe  and  we  are 
unable to obtain necessary licenses or other rights on acceptable terms, we would either have to change our product so 
that  it  does  not  infringe  or  stop  making  the  infringing  product,  which  could  have  a  material  adverse  effect  on  our 
operating results, financial condition, and cash flows. 

Manufacturing 

We utilize a fabless business model, working with third parties to manufacture and assemble our integrated circuits. This 
fabless approach allows us to focus our engineering and design resources on our strengths and to reduce our fixed costs 
and  capital  expenditures.  In  contrast  to  many  fabless  semiconductor  companies,  who  utilize  standard  process 
technologies  and  design  rules  established  by  their  foundry  partners,  we  have  developed  our  own  proprietary  process 
technology and collaborate with our foundry partners to install our technology on their equipment in their facilities for 
use solely on our behalf. This close collaboration and control over the manufacturing process has historically resulted in 
favorable yields and product performance for our integrated circuits. 

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We  currently  contract  with  two  suppliers  to  manufacture  our  wafers  in  foundries  located  in  China.  Once  our  silicon 
wafers  have  been  produced,  they  are  shipped  to  our  facility  in  Chengdu,  China  for  wafer  sort.  Our  semiconductor 
products are then assembled and packaged by independent subcontractors in Malaysia and China. The assembled ICs are 
then sent for final testing at our Chengdu facility prior to shipping to our customers. 

In September 2004,  we  signed an agreement  with a Chinese local authority to construct a  facility  in Chengdu, China, 
initially for the testing of our ICs. Pursuant to this agreement, we agreed to contribute capital in the form of cash, in-kind 
assets,  and/or  intellectual  property,  of  at  least  $5.0  million  to  our  wholly-owned  Chinese  subsidiary  as  the  registered 
capital for the subsidiary and have exercised the option to purchase land use rights for the facility for approximately $0.2 
million. We also have the option to acquire the facility after a five-year lease term for the original construction cost less 
rents paid, which is currently estimated at $1.9 million and. which becomes exercisable in March 2011. We will likely 
enter  into  a  purchase  agreement  for  this  facility  at  a  date  to  be  determined  and  as  the  opportunity  necessitates.  The 
facility has been fully operational since 2006 and we have benefitted from shorter manufacturing cycle times and lower 
labor and overhead costs. Furthermore, we are continuing to expand our product testing capabilities in our China facility 
and  are  able  to  take  advantage  of  the  rich  pool  of  local  engineering  talent  to  expand  our  manufacturing  support  and 
engineering operations. 

Key Personnel and Employees 

Our performance is substantially dependent on the performance of our executive officers and key employees. Due to the 
relative  complexity  of  the  design  of  our  analog  and  mixed-signal  ICs,  our  engineers  generally  have  more  years  of 
experience and greater circuit design aptitude than the more prevalent digital circuit design engineer.  Analog engineers 
with advanced skills are limited in number and difficult to replace. The loss of the services of key officers, managers, 
engineers and other technical personnel would harm the business. Our future success will depend, in part, on our ability 
to attract, train, retain, and motivate highly qualified technical and managerial personnel.  We may not be successful in 
attracting and retaining such personnel. Our employees are not represented by a collective bargaining organization, and 
we have never experienced a work stoppage or strike. Our management considers employee relations to be good. As of 
December 31, 2010, we employed 889 employees located in the United States, Taiwan, China, Japan, Korea and Europe. 

Competition 

The  analog  and  mixed-signal  semiconductor  industry  is  highly  competitive,  and  we  expect  competitive  pressures  to 
continue. Our ability to compete effectively and to expand our business will depend on our ability to continue to recruit 
both applications engineering and design engineering personnel, our ability to introduce new products, and our ability to 
maintain  the  rate  at  which  we  introduce  these  new  products.  Our  industry  is  characterized  by  decreasing  unit  selling 
prices over the life of a product. We compete with domestic and international semiconductor companies, many of which 
have substantially greater financial and other resources with which to pursue engineering, manufacturing, marketing, and 
distribution of their products. We are in direct and active competition, with respect to one or more of our product lines, 
with at least 10 manufacturers of such products, of varying size and financial strength. The number of our competitors 
has  grown due to expansion  of the  market segments in  which  we participate. We consider our primary competitors to 
include  Fairchild  Semiconductor  International,  Intersil  Corporation,  Linear  Technology,  Maxim  Integrated  Products, 
Micrel Inc., Microsemi Corporation, National Semiconductor Corporation, O2Micro International, Richtek Technology 
Corporation,  Rohm  Co.,  Ltd.,  Semtech  Corporation,  STMicroelectronics  N.V.,  Texas  Instruments  Incorporated  and 
Volterra. 

We  expect  continued  competition  from  existing  competitors  as  well  as  competition  from  new  entrants  into  the 
semiconductor  market.  We  believe  that  we  are  competitive  with  respect  to  these  factors,  particularly  because  our  ICs 
typically  are  smaller  in  size,  are  highly  integrated,  possess  higher  levels  of  power  management  functionalities  and 
achieve high performance specifications at lower price points than most of our competition. However, we cannot assure 
you  that  our  products  will  continue  to  compete  favorably  or  that  we  will  be  successful  in  the  face  of  increasing 
competition  from  new  products  and  enhancements  introduced  by  existing  competitors  or  new  companies  entering  this 
market. 

Geographical and Segment Information 

Please  refer  to  the  geographical  and  segment  information  for  each  of  the  last  three  fiscal  years  in  Note  13  to  our 
consolidated financial statements. 

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Please refer to the discussion of risks attendant to our foreign operations in the section entitled “Item 1A: Risk Factors”. 

Available Information 

We were incorporated in California in 1997 and reincorporated in Delaware in November 2004. Our executive offices 
are located at 6409 Guadalupe Mines Road, San Jose, CA 95120. Our telephone number is (408) 826-0600. Our e-mail 
address is investors@monolithicpower.com, and our website is www.monolithicpower.com. Our annual reports on Form 
10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and amendments to those filed or furnished pursuant 
to Sections 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, are available free of charge. These may 
be obtained from our website, as soon as reasonably practicable after we electronically file such material with, or furnish 
it  to,  the  Securities  and  Exchange  Commission,  or  at  the  SEC  website  at  www.sec.gov.  Information  contained  on  our 
website is not a part of this Form 10-K. 

Executive Officers of the Registrant 

The executive officers of the Company, and their ages as of March 4, 2011 are as follows: 

Name 
Michael R. Hsing 
Meera P. Rao 
Deming Xiao 
Maurice Sciammas 
Paul Ueunten 
Saria Tseng 

Age 
51 
50 
48 
51 
56 
40 

Position 
President, Chief Executive Officer, and Director 
CFO and Principal Financial and Accounting Officer 
President of MPS Asia Operations 
Senior Vice President of Worldwide Sales and Marketing 
Senior Vice President of Engineering 
Vice President, General Counsel 

Michael R. Hsing has served on our board of directors and has served as our President and Chief Executive Officer since 
founding  Monolithic  Power  Systems  in  August  1997.  Before  founding  our  company,  Mr.  Hsing  held  senior  technical 
positions at companies such as Supertex, Inc. and Micrel, Inc. Mr. Hsing is an inventor on numerous patents related to 
the  process  development  of  bipolar  mixed-signal  semiconductor  manufacturing.  Mr.  Hsing  holds  a  B.S.E.E.  from  the 
University of Florida. 

Meera  P.  Rao  has  served  as  our  Chief  Financial  Officer  since  January  2011.  Ms.  Rao  joined  us  in  January  2009  and 
served as our Vice President of Finance and Corporate Controller. Prior to joining MPS, she was the principal in her own 
consulting  practice,  working  with  various  semiconductor  companies,  including  MPS,  where  she  set  up  our  business 
operations  in  Chengdu,  China  in  2006.  Ms.  Rao  has  more  than  20  years  of  experience  with  semiconductor  and  high 
technology  companies  and  has  held  various  senior  executive  positions,  including  the  CFO  of  Integration  Associates, 
Vice President of Finance and Interim CFO at Atrica, Vice President of Finance at Raza Foundries, Corporate Controller 
and Interim CFO at nVIDIA, as well as various positions at Advanced Micro Devices (AMD).  Ms. Rao is a CPA and 
holds an MBA from the University of Rochester. 

Maurice Sciammas currently serves as our Senior Vice President of Worldwide Sales and Marketing, a position he has 
had  since  2007.  Mr.  Sciammas  joined  the  Company  in  July  1999  and  served  as  Vice  President  of  Products  and  Vice 
President of Sales (excluding greater China) until he was appointed to his current position.  Before joining the Company, 
he  was  Director  of  IC  Products  at  Supertex  from  1990  to 1999.  He  has  also  held  positions  at  Micrel,  Inc.  He  holds a 
B.S.E.E. degree from San Jose State University. 

Deming Xiao has served as our President of our Asia Operations since January 2008. Since joining us in May 2001, Mr. 
Xiao has held several executive positions, including Foundry Manager and Senior Vice President of Operations. Before 
joining  us,  from  June  2000  to  May  2001,  Mr.  Xiao  was  Engineering  Account  Manager  at  Chartered  Semiconductor 
Manufacturing, Inc. Prior to that, Mr. Xiao spent 6 years as the Manager of Process Integration Engineering at Fairchild 
Imaging  Sensors.  Mr.  Xiao  holds  a  B.S.  in  Semiconductor  Physics  from  Sichuan  University,  Chengdu,  China  and  a 
M.S.E.E. from Wayne State University. 

Paul Ueunten has served as our Senior Vice President of Design Engineering since October 2007.  Mr. Ueunten joined 
us  in  May  1998  and  held  several  senior  level  positions,  including  Vice  President  of  Design  Engineering,  prior  to  his 
appointment  as  our  Senior  Vice  President  of  Design  Engineering.   Before  joining  us,  Mr.  Ueunten  held  positions  at 
National  Semiconductor,  Signetics  Corporation  and  Sperry  Flight  Systems.  Mr.  Ueunten  holds  a  MS  in  Electrical 

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Engineering from the University of Santa Clara, a BS in Electrical Engineering from the University of Washington and a 
BS in Engineering-Physics from Pacific Lutheran University. Mr. Ueunten is credited with a number of patents and is a 
Member of the Institute of Electrical and Electronics Engineers. 

Saria  Tseng  has  served  as  our  Vice  President  and  General  Counsel  since  November  2004.  Ms.  Tseng  joined  the 
Company from MaXXan Systems, Inc., a privately held provider of intelligent storage networking solutions, where she 
was also Vice President and General Counsel from January 2001 to November 2004. Prior to her corporate experience, 
Ms.  Tseng  was  an  attorney  at  Gray  Cary  Ware  &  Freidenrich,  LLP  from  July  1999  to  January  2001.  Previously,  she 
practiced  law  at  Wang  &  Wang  and  Jones  Day,  Reavis  &  Pogue.  Ms.  Tseng  is  a  member  of  the  state  bar  in  both 
California and New York and is a member of the bar association of the Republic of China (Taiwan). She holds Masters 
of Law degrees from Boalt Hall, University of California at Berkeley and the Chinese Culture University in Taipei. 

ITEM 1A. 

  RISK FACTORS 

Our business involves risks and uncertainties.  You should carefully consider the risks described below, together with all 
of  the  other  information  in  this  annual  report  on  Form  10-K  and  other  filings  with  the  Securities  and  Exchange 
Commission in evaluating our business.  If any of the following risks actually occur, our business, financial condition, 
operating  results,  and  growth  prospects  would  likely  be  adversely  affected.  In  such  an  event,  the  trading  price  of  our 
common stock could decline, and you could lose all or part of your investment in our common stock. Our past financial 
performance  should  not  be  considered  to  be  a  reliable  indicator  of  future  performance,  and  investors  should  not  use 
historical trends to anticipate results or trends in future periods.  These risks involve forward-looking statements and our 
actual results may differ substantially from those discussed in these forward-looking statements. 

The future trading price of our common stock could be subject to wide fluctuations in response to a variety of 
factors. 

The future trading price of our common stock is likely to be highly volatile and could be subject to wide fluctuations in 
price in response to various factors, many of which are beyond our control, including: 

our results of operations and financial performance; 
general economic, industry and global market conditions; 

• 
• 
•  whether our forward guidance meets the expectations of our investors; 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 

the depth and liquidity of the market for our common stock; 
developments generally affecting the semiconductor industry; 
commencement of or developments relating to our involvement in litigation; 
investor perceptions of us and our business strategies; 
changes in securities analysts’ expectations or our failure to meet those expectations; 
actions by institutional or other large stockholders; 
terrorist acts or acts of war; 
actual or anticipated fluctuations in our results of operations; 
developments with respect to intellectual property rights; 
announcements of technological innovations or significant contracts by us or our competitors; 
introduction of new products by us or our competitors; 
our sale of common stock or other securities in the future; 
conditions and trends in technology industries; 
changes in market valuation or earnings of our competitors; 
our  ability  to  develop  new  products,  enter  new  market  segments,  gain  market  share,  manage  litigation  risk, 
diversify our customer base and successfully secure manufacturing capacity; 
our ability to increase our gross margins; and 
changes in the estimation of the future size and growth rate of our markets. 

• 
• 

In  addition,  the  stock  market  in  general  often  experiences  substantial  volatility  that  is  seemingly  unrelated  to  the 
operating performance of particular companies. These broad market fluctuations may adversely affect the trading price 
of our common stock. 

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We  expect  our  operating  results  to  fluctuate  from  quarter  to  quarter  and  year  to  year,  which  may  make  it 
difficult to predict our future performance and could cause our stock price to decline and be volatile. 

Our  revenue,  expenses,  and  results  of  operations  are  difficult  to  predict,  have  varied  significantly  in  the  past  and  will 
continue to fluctuate significantly in the future due to a number of factors, many of which are beyond our control. We 
expect fluctuations to continue for a number of reasons, including: 

• 

• 
• 
• 
• 

a  deterioration  in  general  demand  for  electronic  products  as  a  result  of  worldwide  financial  crises  and 
associated macro-economic slowdowns; 
a deterioration in business conditions at our distributors, value-added resellers and/or end-customers; 
adverse general economic conditions in the countries where our products are sold or used; 
the timing of developments and related expenses in our litigation matters; 
the  possibility  of  additional  lost  business  as  a  result  of  customer  and  prospective  customer  concerns  about 
adverse outcomes in our litigations or about being litigation targets; 
continued dependence on our turns business (orders received and shipped within the same fiscal quarter); 
increases in assembly costs due to commodity price increases, such as the price of gold; 
the timing of new product introductions by us and our competitors; 
the acceptance of our new products in the marketplace; 
our ability to develop new process technologies and achieve volume production; 
our ability to meet customer product demand in a timely manner; 
the scheduling, rescheduling, or cancellation of orders by our customers; 
the cyclical nature of demand for our customers’ products; 
an increase in stock rotation reserves; 
our ability to manage our inventory levels, including the levels of inventory held by our distributors; 
inventory levels and product obsolescence; 
seasonality and variability in the computer, consumer electronics, and communications markets; 
the availability of adequate manufacturing capacity from our outside suppliers; 
increases in prices for finished wafers due to general capacity shortages; 
the potential loss of future business resulting from current capacity issues; 
changes in manufacturing yields; and 

• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
•  movements in exchange rates, interest rates or tax rates. 

Due  to  the  factors  noted  above  and  other  risks  described  in  this  section,  many  of  which  are  beyond  our  control,  you 
should  not  rely  on  quarter-to-quarter  or  year-over-year  comparisons  to  predict  our  future  financial  performance. 
Unfavorable changes in any of the above factors may seriously harm our business and cause our stock price to decline 
and be volatile. 

We may not be profitable on a quarterly or annual basis. 

Our profitability is dependent on many factors, including: 

• 

• 

• 
• 

our  sales,  which  because  of  our  turns  business  (i.e.,  orders  received  and  shipped  within  the  same  fiscal 
quarter), is difficult to accurately forecast; 
consumer electronic sales, which has experienced and may continue to experience a downturn as a result of the 
worldwide economic crisis; 
our competition, which could adversely impact our selling prices and our potential sales; 
our manufacturing costs, including our ability to negotiate with our vendors and our ability to efficiently run 
our test facility in China; 

•  manufacturing capacity constraints; and 
• 

our operating expenses, including general and administrative expenses, selling and marketing expenses, stock-
based  compensation  expenses,  litigation  expenses,  which  we  expect  to  be  significant  due  to  the  litigation  in 
which we are involved, and research and development expenses relating to products that will not be introduced 
and will not generate revenue until later periods, if at all. 

We  may  not  achieve  profitability  on  a  quarterly  or  annual  basis  in  the  future.  Unfavorable  changes  in  our  operations, 
including any of the factors noted above, may have a material adverse effect on our quarterly or annual profitability. 

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We may not experience growth rates comparable to past years. 

In the past, our revenues increased significantly in certain years due to increased sales of certain of our products. Due to 
various factors, including increased competition, loss of certain of our customer install base, unfavorable changes in our 
operations,  reduced  global  electronics  demand,  end-customer  market  downturn,  market  acceptance  and  penetration  of 
our current and future products and ongoing litigation, we may not experience growth rates comparable to past periods, 
which could materially and adversely affect our stock price and results of operations. 

Due to product shortages early in 2010, several major customers in Korea sought alternative suppliers, which impacted 
our revenue in the fourth quarter of 2010 and may continue to impact our revenue in future periods. If we are unable to 
fill this revenue gap, our growth rate may be impacted, which could materially and adversely affect our stock price and 
results of operations. 

We may be unsuccessful in developing and selling new products with margins similar to or better than what we 
have experienced in the past, which would impact our overall gross margin and financial performance. 

Our success depends on products that are differentiated in the market, which result in gross margins that have historically 
been above the industry averages. During 2010, our gross margins decreased materially as compared to 2009. Should we 
fail  to  improve  our  gross  margin  in  future  years,  and  accordingly  develop  and  introduce  sufficiently  differentiated 
products that result in higher gross margins than industry averages, our financial condition could be materially adversely 
affected. 

The  highly  cyclical  nature  of  the  semiconductor  industry,  which  has  produced  significant  and  sometimes 
prolonged downturns, could materially adversely affect our operating results, financial condition and cash flows. 

Historically,  the  semiconductor  industry  has  been  highly  cyclical  and,  at  various  times,  has  experienced  significant 
downturns and wide fluctuations in supply and demand. These conditions have caused significant variances in product 
demand and production capacity, as well as rapid erosion of average selling prices. The industry may experience severe 
or prolonged downturns in the future, which could result in downward pressure on the price of our products as well as 
lower demand for our products. Because significant portions of our expenses are fixed in the short term or incurred in 
advance  of  anticipated  sales,  we  may  not  be  able  to  decrease  our  expenses  in  a  timely  manner  to  offset  any  sales 
shortfall.  These  conditions  could  have  a  material  adverse  effect  on  our  operating  results,  financial  condition  and  cash 
flows. 

If demand for our products declines in the major end markets that we serve, our revenue will decrease and our 
results of operations and financial condition would be materially and adversely affected. 

We believe that the application of our products in the computer, consumer electronics and communications markets will 
continue to account for the majority of our revenue. If the demand for our products declines in the major end markets 
that we serve, our revenue will decrease and our results of operations and financial condition would be materially and 
adversely affected. In addition, as technology evolves, the ability to integrate the functionalities of various components, 
including our discrete semiconductor products, onto a single chip and/or onto other components of systems containing 
our products increases. Should our customers require integrated solutions that we do not offer, demand for our products 
could decrease, and our business and results of operations would be materially and adversely affected. 

We derive most of our revenue from direct or indirect sales to customers in Asia and have significant operations 
in Asia, which may expose us to political, cultural, regulatory, economic, foreign exchange, and operational risks. 

We  derive  most  of  our  revenue  from  customers  located  in  Asia  through  direct  or  indirect  sales  through  distribution 
arrangements  with  parties  located  in  Asia.  As  a  result,  we  are  subject  to  increased  risks  due  to  this  geographic 
concentration of business and operations. For the year ended December 31, 2010, approximately 87% of our revenue was 
from customers in Asia. There are risks inherent in doing business in Asia, and internationally in general, including: 

• 

• 

• 

changes in, or impositions of, legislative or regulatory requirements, including tax laws in the United States 
and in the countries in which we manufacture or sell our products; 
trade restrictions, including restrictions imposed by the United States  government on trading  with parties in 
foreign countries; 
currency exchange rate fluctuations impacting intra-company transactions; 

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transportation delays; 
changes in tax regulations in China that may impact our tax status in Chengdu; 

international political relationships and threats of war; 
terrorism and threats of terrorism; 
epidemics and illnesses; 

• 
• 
•  multi-tiered distribution channels that lack visibility to end customer pricing and purchase patterns; 
• 
• 
• 
•  work stoppages and infrastructure problems due to adverse weather conditions or natural disasters; 
•  work stoppages related to employee dissatisfaction; 
• 
• 
• 
• 
• 

economic and political instability; 
changes in import/export regulations, tariffs, and freight rates; 
longer accounts receivable collection cycles and difficulties in collecting accounts receivables; 
enforcing contracts generally; and 
less effective protection of intellectual property and contractual arrangements. 

If we fail to expand our customer base and significantly reduce the geographical concentration of our customers, we will 
continue  to  be  subject  to  the  foregoing  risks,  which  could  materially  and  adversely  affect  our  revenue  and  financial 
condition. 

We receive a significant portion of our revenue  from our distribution channel, and the loss of any one of these 
distributors  or  value-added  resellers  or  failure  to  collect  a  receivable  from  them  could  adversely  affect  our 
operations and financial position. 

We  market  our  products  through  distribution  arrangements  and  value-added  resellers  and  through  our  direct  sales  and 
applications  support  organization  to  customers  that  include  OEMs,  ODMs  and  electronic  manufacturing  service 
providers. Receivables from our customers are generally not secured by any type of collateral and are subject to the risk 
of  being  uncollectible.  For  the  year  ended  December  31,  2010,  sales  to  our  largest  distributor  accounted  for 
approximately  14%  of  our  total  revenue.  Significant  deterioration  in  the  liquidity  or  financial  condition  of  any  of  our 
major  customers  or  any  group  of  our  customers  could  have  a  material  adverse  impact  on  the  collectability  of  our 
accounts receivable and our future operating results. We primarily conduct our sales on a purchase order basis, and we 
do not have any long-term supply contracts. 

Moreover,  we  believe  a  high  percentage  of  our  products  are  eventually  sold  to  a  number  of  OEMs.  Although  we 
communicate  with  OEMs  in  an  attempt  to  achieve  “design  wins,”  which  are  decisions  by  OEMs  and/or  ODMs  to 
incorporate  our  products,  we  do  not  have  purchase  commitments  from  these  end  users.  Therefore,  there  can  be  no 
assurance  that  the  OEMs  and/or  ODMs  will  continue  to  incorporate  our  ICs  into  their  products.  OEM  technical 
specifications and requirements can change rapidly, and we may not have products that fit new specifications from an 
end-customer for whom we have had previous design wins. We cannot be certain that we will continue to achieve design 
wins from large OEMs, that our direct customers will continue to be successful in selling to the OEMs, or that the OEMs 
will  be  successful  in  selling  products  which  incorporate  our  ICs.  The  loss  of  any  significant  customer,  any  material 
reduction  in  orders  by  any  of  our  significant  customers  or  by  their  OEM  customers,  the  cancellation  of  a  significant 
customer order, or the cancellation or delay of a customer’s or OEM’s significant program or product could reduce our 
revenue and adversely affect our operations and financial condition. 

Due to the nature of our business as a component supplier, we may have difficulty both in accurately predicting 
our future revenue and appropriately managing our expenses. 

Because we provide components for end products and systems, demand for our products is influenced by our customers’ 
end  product  demand.  As  a  result,  we  may  have  difficulty  in  accurately  forecasting  our  revenue  and  expenses.  Our 
revenue depends on the timing, size, and speed of commercial introductions of end products and systems that incorporate 
our products, all of which are inherently difficult to forecast, as well as the ongoing demand for previously introduced 
end products and systems. In addition, demand for our products is influenced by our customers’ ability to manage their 
inventory. Our sales to distributors are subject to higher volatility because they service demand from multiple levels of 
the supply chain which, in itself, is inherently difficult to forecast. Specifically, in the fourth quarter of 2010, demand 
was  lower  because  distributors  used  up  inventory  that  was  shipped  in  the  third  quarter.  If  our  customers,  including 
distributors, do not manage their inventory correctly or misjudge their customers’ demand, our shipments to and orders 
from our customers may vary significantly on a quarterly basis. 

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Our ability to increase product sales and revenues is currently constrained by the manufacturing capacity of our 
suppliers. 

Although we provide our suppliers with rolling forecasts of our production requirements, their ability to provide wafers 
to us is limited by the available capacity, particularly capacity in the geometries we require, at the facilities in which they 
manufacture wafers for us.  As a result, this lack of capacity has constrained our product sales and revenue growth.  In 
addition,  an  increased  need  for  capacity  to  meet  internal  demands  or  demands  of  other  customers  could  cause  our 
suppliers to reduce capacity available to us. Our suppliers may also require us to pay amounts in excess of contracted or 
anticipated  amounts  for  wafer  deliveries  or  require  us  to  make  other  concessions  in  order  to  acquire  the  wafer  supply 
necessary to meet our customer requirements. If our suppliers extend lead times, limit supplies or the types of capacity 
we require, or increase prices due to capacity constraints or other factors, our revenue and gross margin may materially 
decline.  In addition, if we experience supply delays or limitations, our customers may reduce their purchase levels with 
us and/or seek alternative solutions to meet their demand, which could materially and adversely impact our business and 
results of operations. 

Due  to  lack  of  capacity,  which  resulted  in  product  shortages  in  early  2010,  several  major  customers  in  Korea  sought 
alternative suppliers, which impacted our revenue in the fourth quarter of 2010 and may continue to impact our revenue 
in  future  periods.  If  we  are  faced  with  capacity  issues  similar  to  what  we  experienced  in  2010,  our  product  sales  and 
revenue may be further impacted, which could materially and adversely affect our business and results of operations. 

We currently depend on two third-party suppliers to provide us with wafers for our products. If any of our wafer 
suppliers become insolvent or capacity constrained and are unable and/or fail to provide us sufficient wafers at 
acceptable yields and at anticipated costs, our revenue and gross  margin  may decline or we may not be able to 
fulfill our customer orders. 

We  have  a  supply  arrangement  with  two  suppliers  for  the  production  of  wafers.  Should  any  of  our  suppliers  become 
insolvent or capacity constrained, we many not be able to fulfill our customer orders, which would likely cause a decline 
in our revenue. 

While certain aspects of our relationship with these suppliers are contractual, many important aspects of this relationship 
depend on our suppliers’ continued cooperation and our management relationships. In addition, the fabrication of ICs is a 
highly complex and precise process. Problems in the fabrication process can cause a substantial percentage of wafers to 
be rejected or numerous ICs on each wafer to be non-functional. This could potentially reduce yields. The failure of our 
suppliers to supply us wafers at acceptable yields could prevent us from fulfilling our customer orders for our products 
and would likely cause a decline in our revenue. 

Further, as is common in the semiconductor industry, our customers may reschedule or cancel orders on relatively short 
notice. Under our agreement with our suppliers, we have an option to order wafers based on a committed forecast that 
can  cover  a  period  of  one  to  six  months.  If  our  customers  cancel  orders  after  we  submit  a  committed  forecast  to  our 
suppliers for the corresponding wafers, we may be required to purchase wafers that we may not be able to resell, which 
would adversely affect our operating results, financial condition, and cash flows. 

We  might  not  be  able  to  deliver  our  products  on  a  timely  basis  if  our  relationships  with  our assembly  and  test 
subcontractors are disrupted or terminated. 

All of our products are assembled by third-party subcontractors and a portion of our testing is currently performed by 
third-party subcontractors. We do not have any long-term agreements with these subcontractors. As a result, we may not 
have direct control over product delivery schedules or product quality. Also, due to the amount of time typically required 
to  qualify  assembly  and  test  subcontractors,  we  could  experience  delays  in  the  shipment  of  our  products  if  we  were 
forced  to  find  alternate  third  parties  to  assemble  or  test  our  products.  In  addition,  events  such  as  the  recent  global 
economic crisis may materially impact our assembly supplier’s ability to operate. Any future product delivery delays or 
disruptions  in  our  relationships  with  our  subcontractors  could  have  a  material  adverse  effect  on  our  operating  results, 
financial condition, and cash flows. 

15 

 
  
  
 
 
 
  
  
  
  
There  may  be  unanticipated  costs  associated  with  adding  to  or  supplementing  our  third-party  supplier’s 
manufacturing capacity. 

We anticipate that future growth of our business will require increased manufacturing capacity on the part of third-party 
supply foundries, assembly shops, or testing facilities for our products.  In order to facilitate such growth, we may need 
to  enter  into  strategic  transactions,  investments  and  other  activities.  Such  activities  are  subject  to  a  number  of  risks, 
including: 

• 
• 

• 

• 
• 

the costs and expense associated with such activities; 
the availability of modern foundries to be developed, acquired, leased or otherwise made available to us or 
our third-party suppliers; 
the ability of foundries and our third-party suppliers to obtain the advanced equipment used in the production 
of our products; 
delays in bringing new foundry operations online to meet increased product demand; and 
unforeseen  environmental,  engineering  or  manufacturing  qualification  problems  relating  to  existing  or  new 
foundry facilities. 

These and other risks may affect the ultimate cost and timing of any expansion of our third-party supplier’s capacity. 

We purchase inventory in advance based on expected demand for our products, and if demand is not as expected, 
we may have insufficient or excess inventory, which could adversely impact our financial position. 

As a fabless semiconductor company, we purchase our inventory from a third party manufacturer in advance of selling 
our  product.  We  place  orders  with  our  manufacturer  based  on  existing  and  expected  orders  from  our  customers  for 
particular  products.  While  our  contracts  with  our  customers  and  distributors  include  lead  time  requirements  and 
cancellation penalties that are designed to protect us from misalignment between customer orders and inventory levels, 
we  must  nonetheless  make  some  predictions  when  we  place  orders  with  our  manufacturer.  In  the  event  that  our 
predictions are inaccurate due to unexpected increases in orders or unavailability of product within the time frame that is 
required, we may have insufficient inventory to meet our customer demands. In the event that we order products that we 
are  unable  to  sell  due  to  a  decrease  in  orders,  unexpected  order  cancellations,  injunctions  due  to  patent  litigations,  or 
product  returns,  we  may  have  excess  inventory  which,  if  not  sold,  may  need  to  be  disposed  of  or  would  result  in  a 
decrease in our revenues in future periods as the excess inventory at our distributors is  sold. If any of these situations 
were to arise, it could have a material impact on our business and financial position. 

If  we  are  unsuccessful  in  any  of  the  legal  proceedings  involving  us  and  any  of  our  competitors,  we  could  be 
prevented  from  selling  many  of  our  products  and/or  be  required  to  pay  substantial  damages.  An  unfavorable 
outcome or an additional award of damages, attorneys’ fees or an injunction could cause our revenue to decline 
significantly and could severely harm our business and operating results. 

If  we  are  not  successful  in  litigation  that  could  be  brought  against  us  or  our  customers,  we  could  be  ordered  to  pay 
monetary  fines  and/or  damages.  If  we  are  found  liable  for  willful  patent  infringement,  damages  could  be  doubled  or 
tripled.  We  and/or  our  customers  could  also  be  prevented  from  selling  some  or  all  of  our  products.  Moreover,  our 
customers and end-users could decide not to use our products or our products or our customers’ accounts payable to us 
could be seized. Finally, interim developments in these proceedings could increase the volatility in our stock price as the 
market assesses the impact of such developments on the likelihood that  we  will or  will  not ultimately prevail in these 
proceedings. 

Given our inability to control the timing and nature of significant events in our legal proceedings that either have 
arisen  or  may  arise,  our  legal  expenses  are  difficult  to  forecast  and  may  vary  substantially  from  our  publicly-
disclosed forecasts with respect to any given quarter, which could contribute to increased volatility in our stock 
price and financial condition. 

Historically, we have incurred significant expenses in connection with various legal proceedings that vary with the level 
of activity in the proceeding. It is difficult for us to forecast our legal expenses for any given quarter, which adversely 
affects our ability to forecast our expected results of operations in general. We may also be subject to unanticipated legal 
proceedings, which would result in our incurrence of unexpected legal expenses. If we fail to meet the expectations of 
securities or industry analysts as a result of unexpected changes in our legal expenses, our stock price could be impacted. 

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Our ongoing legal proceedings and the potential for additional legal proceedings have diverted, and may continue 
to divert, financial and management resources. 

The semiconductor industry is characterized by frequent claims of infringement and litigation regarding patent and other 
intellectual property rights. Patent infringement is an ongoing risk, in part because other companies in our industry could 
have  patent  rights  that  may  not  be  identifiable  when  we  initiate  development  efforts.  Litigation  may  be  necessary  to 
enforce  our  intellectual  property  rights,  and  we  may  have  to  defend  ourselves  against  additional  infringement  claims. 
Such litigation is very costly. In the event any third party makes a new infringement claim against us or our customers, 
we could incur additional ongoing legal expenses. In addition, in connection  with these legal proceedings,  we  may be 
required to post bonds to defend our intellectual property rights in certain countries for an indefinite period of time, until 
such dispute is resolved. If our legal expenses materially increase or exceed anticipated amounts, our capital resources 
and financial condition could be adversely affected. Further, if we are not successful in any of our intellectual property 
defenses,  our  financial  condition  cold  be  adversely  affected  and  our  business  could  be  harmed.  In  addition,  our 
management  team  may  also  be  required  to  devote  a  great  deal  of  time,  effort  and  energy  to  these  legal  proceedings, 
which could distract management’s focus on our operations and adversely affect our business. 

We will continue to vigorously defend and enforce our intellectual property rights around the world, especially as 
it relates to patent litigation. We will take the appropriate action in various courts throughout the world and may 
be required to post bonds to defend such intellectual property in certain countries for an indefinite period of time, 
until  such  dispute  is  resolved.  If  we  are  not  successful  in  defending  our  intellectual  property,  we  could  lose 
revenue and the business could be harmed. 

From time to time, we are faced with having to defend our intellectual property rights throughout the world. Should we 
become  engaged  in  such  proceedings,  it  could  divert  management’s  attention  from  focusing  on  and  implementing  the 
business strategy. Further, should we not be successful in any of our intellectual property defenses, the revenue may be 
affected and the business could be harmed. 

Failure to protect our proprietary technologies or maintain the right to certain technologies may negatively affect 
our ability to compete. 

We rely heavily on our proprietary technologies. Our future success and competitive position depend in part upon our 
ability to obtain and maintain protection of certain proprietary technologies used in our products. We pursue patents for 
some of our new products and unique technologies, and we also rely on a combination of nondisclosure agreements and 
other  contractual  provisions,  as  well  as  our  employees’  commitment  to  confidentiality  and  loyalty,  to  protect  our 
technology, know-how, and processes. Despite the precautions we take, it may be possible for unauthorized third parties 
to  copy  aspects  of  our  current  or  future  technology  or  products  or  to  obtain  and  use  information  that  we  regard  as 
proprietary. We intend to continue to protect our proprietary technology, including through patents. However, there can 
be no assurance that the steps we take will be adequate to protect our proprietary rights, that our patent applications will 
lead  to  issued  patents,  that  others  will  not  develop  or  patent  similar  or  superior  products  or  technologies,  or  that  our 
patents will not be challenged, invalidated, or circumvented by others. Furthermore, the laws of the countries in which 
our  products  are  or  may  be  developed,  manufactured,  or  sold  may  not  protect  our  products  and  intellectual  property 
rights  to  the  same  extent  as  laws  in  the  United  States.  Our  failure  to  adequately  protect  our  proprietary  technologies 
could harm our business. 

The market for government-backed student loan auction-rate securities has suffered a decline in liquidity which 
may impact the liquidity and potential value of our investment portfolio. 

The  market  for  government-backed  student  loan  auction-rate  securities  with  interest  rates  that  reset  through  a  Dutch 
auction  every  7  to  35  days,  became  illiquid  in  2008.  At  December  31,  2010, the  Company’s investment 
portfolio included $19.2 million, net of impairment charges of $1.0 million, in government-backed student loan auction-
rate securities. As of that date, $20.2 million, the face value of our auction-rate security investments, have failed to reset 
through  successful  auctions  and  it  is  unclear  as  to  when  these  investments  will  regain  their  liquidity.  The  underlying 
maturity of these auction-rate securities is up to 37 years.  

Based on certain assumptions described in Note 2, “Fair Value Measurements”, to our consolidated financial statements 
and  the  Liquidity  and  Capital  Resources  section  of  “Item  2.  Management’s  Discussion  and  Analysis  of  Financial 
Condition  and  Results  of  Operations”  of  this  annual  report  on  Form  10-K,  we  recorded  temporary  and  other-than-
temporary  impairment  charges  on  these  investments.  The  valuation  is  subject  to  fluctuations  in  the  future,  which  will 

17 

 
  
 
 
  
  
  
  
  
depend on many factors, including the collateral quality, potential to be called or restructured, underlying final maturity, 
insurance  guaranty,  liquidity  and  market  conditions,  among  others.  We  experienced  our  first  failed  auction  in  mid-
February 2008. 

Should there be further deterioration in the market for auction-rate securities or if the accounting rules for these securities 
change, the value of our portfolio may decline, which may have an adverse impact on our cash position and our earnings. 
In addition, it is unlikely that we will be able to liquidate our auction-rate securities in the short term. 

We  may  be  unsuccessful  in  developing  and  selling  new  products  or  in  penetrating  new  markets  required  to 
maintain or expand our business. 

Our competitiveness and future success depend on our ability to design, develop, manufacture, assemble, test, market, 
and support new products and enhancements on a timely and cost-effective basis. A fundamental shift in technologies in 
any of our product markets could have a material adverse effect on our competitive position within these markets. Our 
failure to timely develop new technologies or to react quickly to changes in existing technologies could materially delay 
our  development  of  new  products,  which  could  result  in  product  obsolescence,  decreased  revenue,  and/or  a  loss  of 
market share to competitors. 

As we develop new product lines, we must adapt to market conditions that are unfamiliar to us, such as competitors and 
distribution channels that are different from those we have known in the past. Some of our new product lines require us 
to re-equip our labs to test parameters we have not tested in the past. If we are unable to adapt rapidly to these new and 
additional conditions, we may not be able to successfully penetrate new markets. 

The  success  of  a  new  product  depends  on  accurate  forecasts  of  long-term  market  demand  and  future  technological 
developments, as well as on a variety of specific implementation factors, including: 

• 
• 
• 
• 
• 
• 
• 

timely and efficient completion of process design and device structure improvements; 
timely and efficient implementation of manufacturing, assembly, and test processes; 
the ability to secure and effectively utilize fabrication capacity in different geometries; 
product performance; 
product availability; 
the quality and reliability of the product; and 
effective marketing, sales and service. 

To  the  extent  that  we  fail  to  timely  introduce  new  products  or  to  quickly  penetrate  new  markets,  our  revenue  and 
financial condition could be materially adversely affected. 

Certain  of  our  CCFL  products  are  used  to  drive  fluorescent  lighting  products  which  contain  small  amount  of 
mercury. 

Our CCFL products are used to drive fluorescent lighting products which contain small amount of mercury. This is the 
subject of environmental concerns, particularly in Europe. Should environmental issues impair the widespread use of our 
CCFL-based products, and should we be unable to produce replacement products based on LED lighting fast enough to 
compensate for the loss of our CCFL-related business, our business and results of operations could be adversely affected. 

The  complexity  of  calculating  our  tax  provision  may  result  in  errors  that  could  result  in  restatements  of  our 
financial statements. 

Due to the complexity associated  with the calculation of our tax provision,  we  have  hired independent tax advisors to 
assist us in the calculation. If we or our independent tax advisors fail to resolve or fully understand certain issues that we 
may have had in the past and issues that may arise in the future, we could be subject to errors, which would result in us 
having to restate our financial statements. Restatements are generally costly and could  adversely impact our results  of 
operations and/or have a negative impact on the trading price of our common stock. 

We face risks in connection with our internal control over financial reporting related to income taxes. 

Because of the complexity of our tax structure, we have had errors in our financial statements in the calculation of our 
tax  provision  that  previously  resulted  in  restatements  of  our  prior  year  financial  results.  Although  we  believe  that  we 

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have  implemented  appropriate  internal  control  over  financial  reporting  related  to  the  computation  of  our  income  tax 
provision, we cannot be certain that any measures we have taken or may take in the future will ensure that we implement 
and  maintain  adequate  internal  control  over  financial  reporting  and  that  we  will  avoid  any  material  weakness  in  the 
future.  In  addition,  we  cannot  assure  you  that  we  will  not  in  the  future  identify  further  material  weaknesses  in  our 
internal  control  over  financial  reporting  related  to  the  calculation  of  our  income  tax  provision  that  we  have  not 
discovered to date, which may impact the reliability of our financial reporting and financial statements. 

Changes in effective tax rates or adverse outcomes resulting from examination of our income tax returns could 
adversely affect our results 

Our future effective tax rates could be adversely affected by earnings being lower than anticipated in countries where we 
have lower statutory rates and higher than anticipated in countries where we have higher statutory rates, by changes in 
the valuation of our deferred tax assets and liabilities, or by changes in tax laws, regulations, accounting principles or 
interpretations  thereof.  In  addition,  we  are  subject  to  the  continuous  examination  of  our  income  tax  returns  by  the 
Internal  Revenue  Service  and  other  tax  authorities.  We  regularly  assess  the  likelihood  of  adverse  outcomes  resulting 
from these examinations to determine the adequacy of our provision for income taxes. There can be no assurance that the 
outcomes  from  these  continuous  examinations  will  not  have  an  adverse  effect  on  our  operating  results  and  financial 
condition. 

Our products must meet exacting specifications, and undetected defects and failures may occur, which may cause 
customers to return or stop buying our products and may expose us to product liability risk. 

Our  customers  generally  establish  demanding  specifications  for  quality,  performance,  and  reliability  that  our  products 
must  meet.  Integrated  circuits  as  complex  as  ours  often  encounter  development  delays  and  may  contain  undetected 
defects or failures when first introduced or after commencement of commercial shipments, which might require product 
replacement or recall. Further, our third-party manufacturing processes or changes thereof, or raw material used in the 
manufacturing  processes  may  cause  our  products  to  fail.  We  have  from  time  to  time  in  the  past  experienced  product 
quality, performance or reliability problems. Our standard warranty period is one year, which exposes the company to 
significant risks of claims for defects and failures. If defects and failures occur in our products, we could experience lost 
revenue, increased costs, including warranty expense and costs associated with customer support, delays in, cancellations 
or rescheduling of orders or shipments, and product returns or discounts, any of which would harm our operating results. 

In addition, product liability claims may be asserted with respect to our technology or products. Although we currently 
have insurance, there can be no assurance that we have obtained a sufficient amount of insurance coverage, that asserted 
claims  will  be  within  the  scope  of  coverage  of  the  insurance,  or  that  we  will  have  sufficient  resources  to  satisfy  any 
asserted claims. 

The  price  and  availability  of  commodities  (e.g.,  gold,  platinum,  copper  and  silicon)  may  adversely  impact  our 
ability to deliver our products in a timely and cost-effective manner and  may affect our business and results of 
operations. 

Our  products  incorporate  commodities  such  as  gold,  platinum,  copper  and  silicon.  The  price  and  availability  of  these 
commodities and other like commodities that we use could negatively impact our business and results of operations. 

Devaluation  of  the  U.S. Dollar  relative  to  other  foreign  currencies,  including  the  Chinese  Yuan,  may  adversely 
affect results of operations. 

Our  manufacturing and packaging  suppliers are and  will continue to be primarily located in China  for the  foreseeable 
future. Should the value of the Chinese Yuan continue to rise against the U.S. Dollar, there could be an increase in our 
manufacturing costs relative to competitors who have manufacturing facilities located in the U.S., which could adversely 
affect  our  operations.  In  addition,  because  we  collect  payments  from  all  customers  in  U.S.  dollars,  fluctuations  in  the 
value of foreign currencies could have an adverse impact on our customers’ business, which could negatively impact our 
business and results of operations. 

19 

 
 
 
  
  
  
  
  
  
  
  
We and our manufacturing partners are or will be subject to extensive Chinese government regulation, and the 
benefit of various incentives from Chinese governments that we and our manufacturing partners receive may be 
reduced or eliminated, which could increase our costs or limit our ability to sell products and conduct activities in 
China. 

Most of our manufacturing partners are located in China. In addition, we have established a facility in China, initially for 
the testing of our ICs. The Chinese government has broad discretion and authority to regulate the technology industry in 
China. China’s government has implemented policies from time to time to regulate economic expansion in China. It also 
exercises significant control over China’s economic growth through the allocation of resources, controlling payment of 
foreign  currency-denominated  obligations,  setting  monetary  policy  and  providing  preferential  treatment  to  particular 
industries  or  companies.  New  regulations  or  the  readjustment  of  previously  implemented  regulations  could  require  us 
and our manufacturing partners to change our business plans, increase our costs, or limit our ability to sell products and 
conduct activities in China, which could adversely affect our business and operating results. 

In  addition,  the  Chinese  government  and  provincial  and  local  governments  have  provided,  and  continue  to  provide, 
various  incentives  to  encourage  the  development  of  the  semiconductor  industry  in  China.  Such  incentives  include  tax 
rebates, reduced tax rates, favorable lending policies, and other measures, some or all of which may be available to our 
manufacturing  partners  and  to  us  with  respect  to  our  facility  in  China.  Any  of  these  incentives  could  be  reduced  or 
eliminated by governmental authorities at any time. Any such reduction or elimination of incentives currently provided 
to our manufacturing partners could adversely affect our business and operating results. 

There  are  inherent  risks  associated  with  the  operation  of  our  testing  facility  in  China,  which  could  increase 
product costs or cause a delay in product shipments. 

We  have  a  testing  facility  in  China  that  began  operations  in  2006.  In  addition  to  the  risks  discussed  elsewhere  in  this 
annual report on Form 10-K, we face the following risks, among others: 

• 
• 

inability to maintain appropriate and acceptable manufacturing controls; and 
higher than anticipated overhead and other costs of operation. 

If  we  are  unable  to  continue  a  fully  operational  status  with  appropriate  controls,  we  may  incur  higher  costs  than  our 
current  expense  levels,  which  would  affect  our  gross  margins.  In  addition,  if  capacity  restraints  result  in  significant 
delays in product shipments, our business and results of operations would be adversely affected. 

The average selling prices of products in our markets have historically decreased over time and will likely do so in 
the future, which could harm our revenues and gross profits. 

Average  selling  prices  of  semiconductor  products  in  the  markets  we  serve  have  historically  decreased  over  time.  Our 
gross profits and financial results will suffer if we are unable to offset any reductions in our average selling prices by 
reducing our costs, developing new or enhanced products on a timely basis with higher selling prices or gross profits, or 
increasing our sales volumes. Additionally, because we do not operate our own manufacturing or assembly facilities, we 
may not be able  to reduce our costs as rapidly as companies that operate their own  facilities, and our costs  may even 
increase, which could also reduce our margins. 

Because of the lengthy sales cycles for our products and the fixed nature of a significant portion of our expenses, 
we  may  incur  substantial  expenses  before  we  earn  associated  revenue  and  may  not  ultimately  achieve  our 
forecasted sales for our products. 

The  introduction  of  new  products  presents  significant  business  challenges  because  product  development  plans  and 
expenditures  must  be  made  up  to  two  years  or  more  in  advance  of  any  sales.  It  takes  us  up  to  12  months  or  more  to 
design  and  manufacture  a  new  product  prototype.  Only  after  we  have  a  prototype  do  we  introduce  the  product  to  the 
market and begin selling efforts in an attempt to achieve design wins. This sales process, which averages six to twelve 
months,  requires  us  to  expend  significant  sales  and  marketing  resources  without  any  assurance  of  success.  Volume 
production of products that use our ICs, if any, may not be achieved for an additional three to six months after an initial 
sale. Sales cycles for our products are lengthy for a number of reasons: 

• 

our customers usually complete an in-depth technical evaluation of our products before they place a purchase 
order; 

20 

 
  
  
  
  
  
   
   
  
  
  
  
  
  
   
• 

• 
• 

the commercial adoption of our products by OEMs and ODMs is typically limited during the initial release of 
their product to evaluate product performance and consumer demand; 
our products must be designed into a customer’s product or system; and 
the  development  and  commercial  introduction  of  our  customers’  products  incorporating  new  technologies 
frequently are delayed. 

As a result of our lengthy sales cycles, we may incur substantial expenses before we earn associated revenue because a 
significant portion of our operating expenses is relatively fixed and based on expected revenue. The lengthy sales cycles 
of  our  products  also  make  forecasting  the  volume  and  timing  of  orders  difficult.  In  addition,  the  delays  inherent  in 
lengthy  sales  cycles  raise  additional  risks  that  customers  may  cancel  or  change  their  orders.  Our  sales  are  made  by 
purchase  orders.  Because  industry  practice  allows  customers  to  reschedule  or  cancel  orders  on  relatively  short  notice, 
backlog is not always a good indicator of our future sales. If customer cancellations or product changes occur, we could 
lose anticipated sales and not have sufficient time to reduce our inventory and operating expenses. 

The  loss  of  any  of  our  key  personnel  or  the  failure  to  attract  or  retain  specialized  technical  and  management 
personnel could impair our ability to grow our business. 

Our future success depends upon our ability to attract and retain highly qualified technical and managerial personnel. We 
are particularly dependent on the continued services of our key executives, including Michael Hsing, our President and 
Chief  Executive  Officer,  who  founded  our  company  and  developed  our  proprietary  process  technology.  In  addition, 
personnel  with  highly  skilled  analog  and  mixed-signal  design  engineering  expertise  are  scarce  and  competition  for 
personnel with these skills is intense. There can be no assurance that we will be able to retain existing key employees or 
that we will be successful in attracting, integrating or retaining other highly qualified personnel with critical capabilities 
in  the  future.  If  we  are  unable  to  retain  the  services  of  existing  key  employees  or  are  unsuccessful  in  attracting  new 
highly qualified employees quickly enough to meet the demands or our business, including design cycles, our business 
could be harmed. 

If we fail to retain key employees in sales, applications, finance and legal or to make continued improvements to 
our internal systems, particularly in the accounting and finance area, our business may suffer. 

If  we  fail  to  continue  to  adequately  staff  our  sales,  applications,  financial  and  legal  staff,  maintain  or  upgrade  our 
business systems and maintain internal controls that meet the demands of our business, our ability to operate effectively 
will suffer. The operation of our business also depends upon our ability to retain these employees, as these employees 
hold  a  significant  amount  of  institutional  knowledge  about  us  and  our  products,  and,  if  they  were  to  terminate  their 
employment, our sales and internal control over financial reporting could be adversely affected. 

We  intend  to  continue  to  expand  our  operations,  which  may  strain  our  resources  and  increase  our  operating 
expenses. 

We  plan  to  continue  to  expand  our  domestic  and  foreign  operations  through  internal  growth,  strategic  relationships, 
and/or acquisitions. We expect that any such expansion will strain our systems and operational and financial controls. In 
addition, we are likely to incur significantly higher operating costs. To manage our growth effectively, we must continue 
to improve and expand our systems and controls, as well as hire experienced administrative and financial personnel. If 
we fail to do so, our growth will be limited. If we fail to  effectively manage our planned expansion of operations, our 
business and operating results may be harmed. 

We may engage in future acquisitions that dilute the ownership interests of our stockholders and cause us to incur 
debt or to assume contingent liabilities, and we may be unable to successfully integrate these companies into our 
operations, which would adversely affect our business. 

As a part of our business strategy, from time to time we review acquisition prospects that would complement our current 
product  offerings,  enhance  our  design  capability  or  offer  other  competitive  opportunities.  In  the  event  of  future 
acquisitions, we could use a significant portion of our available cash, cash equivalents and short-term investments, issue 
equity  securities  which  would  dilute  current  stockholders’  percentage  ownership,  incur  substantial  debt  or  contingent 
liabilities, and/or incur impairment charges related to goodwill or other intangibles. Such actions by us could impact our 
operating results and/or the price of our common stock. 

21 

 
   
   
   
  
  
  
 
  
  
  
  
  
  
In addition, we may be unable to identify or complete prospective acquisition for various reasons, including competition 
from other companies in the semiconductor industry, the valuation expectations of acquisition candidates and applicable 
antitrust  laws  or  related  regulations.  If  we  are  unable  to  identify  and  complete  acquisitions,  we  may  not  be  able  to 
successfully expand our business and product offerings. 

To the extent we are successful in completing strategic acquisitions, if we are unsuccessful in integrating any acquired 
company into our operations or if integration is more difficult than anticipated, we may experience disruptions that could 
harm our business and not realize the anticipated benefits of the acquisitions. Some of the risks that may adversely affect 
our ability to integrate or realize any anticipated benefits from the acquired companies, businesses or assets include those 
associated with: 

• 
• 
• 
• 
• 
• 
• 
• 
• 

unexpected losses of key employees or customers of the acquired companies or businesses; 
conforming the acquired company’s standards, processes, procedures and controls with our operations; 
coordinating new product and process development; 
hiring additional management and other critical personnel; 
increasing the scope, geographic diversity and complexity of our operations; 
difficulties in consolidating facilities and transferring processes and know-how; 
other difficulties in the assimilation of acquired operations, technologies or products; 
diversion of management’s attention from other business concerns; and 
adverse effects on existing business relationships with customers. 

We compete against  many companies with substantially greater financing and other resources, and our  market 
share may be reduced if we are unable to respond to our competitors effectively. 

The  analog  and  mixed-signal  semiconductor  industry  is  highly  competitive,  and  we  expect  competitive  pressures  to 
continue. Our ability to compete effectively and to expand our business will depend on our ability to continue to recruit 
applications  and  design  talent,  our  ability  to  introduce  new  products,  and  our  ability  to  maintain  the  rate  at  which  we 
introduce these new products. We compete with domestic and non-domestic semiconductor companies, many of which 
have substantially greater financial and other resources with which to pursue engineering, manufacturing, marketing, and 
distribution of their products. We are in direct and active competition, with respect to one or more of our product lines, 
with at least 10 manufacturers of such products, of varying size and financial strength. The number of our competitors 
has grown due to the expansion of the market segments in which we participate. We consider our competitors to include, 
but not be limited to: Fairchild Semiconductor, Intersil, Linear, Maxim Integrated Products, Micrel, Microsemi, National 
Semiconductor,  O2Micro,  RichTek,  Rohm,  Semtech,  STMicroelectronic,  Texas  Instruments  and  Volterra.  We  expect 
continued competition from existing competitors as well as competition from new entrants in the semiconductor market. 

We cannot assure you that our products will continue to compete favorably or that we will be successful in the face of 
increasing  competition  from  new  products  and  enhancements  introduced  by  existing  competitors  or  new  companies 
entering this market, which would materially and adversely affect our results of operations and our financial condition. 

If securities or industry analysts downgrade our stock or do not continue to publish research or reports about our 
business, our stock price and trading volume could decline. 

The  trading  market  for  our  common  stock  will  depend  on  the  research  and  reports  that  industry  or  securities  analysts 
publish about  us or our business. We do not have any control over these analysts. If one or more of the analysts  who 
cover us downgrade our stock, our stock price would likely decline. If one or more of these analysts cease coverage of us 
or fail to regularly publish reports on us, we could lose visibility in the financial markets, which in turn could cause our 
stock price or trading volume to decline. 

Because of their significant stock ownership, our officers and directors will be able to exert significant influence 
over our future direction. 

Executive  officers,  directors,  and  affiliated  entities  beneficially  owned  in  aggregate,  approximately  17%  of  our 
outstanding  common  stock  as  of  December  31,  2010.  These  stockholders,  if  acting  together,  would  be  able  to 
significantly  influence  all  matters  requiring  approval  by  our  stockholders,  including  the  election  of  directors  and  the 
approval of mergers or other business combination transactions. 

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Major earthquakes or other natural disasters and resulting systems outages may cause us significant losses. 

Our corporate headquarters, the production facilities of our third-party wafer supplier, our IC testing facility, a portion of 
our assembly and research and development activities, and certain other critical business operations are located in or near 
seismically active regions and are subject to periodic earthquakes. We do not maintain earthquake insurance and could 
be  materially  and  adversely  affected  in  the  event  of  a  major  earthquake.  Much  of  our  revenue,  as  well  as  our 
manufacturers and assemblers, are concentrated in Asia. Such concentration increases the risk that other natural disasters, 
labor  strikes,  terrorism,  war,  political  unrest,  epidemics,  and/or  health  advisories  could  disrupt  our  operations.  In 
addition, we rely heavily on our internal information and communications systems and on systems or support services 
from third parties to manage our operations efficiently and effectively. Any of these are subject to failure due to a natural 
disaster  or  other  disruption.  System-wide  or  local  failures  that  affect  our  information  processing  could  have  material 
adverse effects on our business, financial condition, operating results, and cash flows. 

Our facilities in Chengdu, China are located in a seismically active area, as evidenced by the May 2008 earthquake that 
was  centered  in  the  Sichuan  Province  of  China.  Although  there  was  no  damage  to  our  facilities  as  a  result  of  that 
earthquake, should there be additional earthquakes in the area, we may incur losses and our business, financial condition 
and/or operating results may suffer. 

ITEM 1B.             UNRESOLVED STAFF COMMENTS 

None. 

ITEM 2.                PROPERTIES 

Our primary operating locations are currently in San Jose, California and Chengdu, Sichuan, China. We currently lease 
approximately  55,110  square  feet  in  San  Jose,  which  serves  as  our  corporate  headquarters,  sales  and  research  and 
development  center.  Certain  test  procedures  and  manufacturing  also  take  place  in  our  San  Jose  facility.  The  San  Jose 
facility was sold and the new landlord has exercised their right to terminate the lease, effective April 18, 2012. 

We lease approximately 56,000 square feet in Chengdu which serves as our test facility and manufacturing hub and we 
constructed  a  150,000  square  foot  research  and  development  facility  in  Chengdu,  which  was  put  into  operation  in 
October 2010. We also lease sales and research and development offices in the United States, Japan, China, Taiwan and 
Korea. We believe that our existing facilities are adequate for our current operations. 

ITEM 3.                LEGAL PROCEEDINGS 

O2Micro 

We have been engaged in a number of legal proceedings involving patent infringement claims with O2Micro, Inc. and its 
parent corporation, O2Micro International Limited (referred to hereinafter as “O2Micro”).  There are two proceedings, 
both  involving  O2Micro’s  U.S.  Patent  No.  7,417,382  (‘382  patent).   On  June  18,  2010,  the  U.S.  International  Trade 
Commission  issued  a  final  determination  finding  of  no  violation  of  Section  337  by  us  or  our  customers  in  an  action 
brought by O2Micro International, Ltd. in 2008.  An International Trade Commission (“ITC”) administrative law judge 
had  previously  issued  an  initial  determination  on  April  20,  2010  that  also  found  no  violation.   The  ITC's  final 
determination  concludes  that  none  of  our  accused  products  infringes  O2Micro's  U.S.  Patent  No.  7,417,382  (the  '382 
patent). 

In  addition  to  the  matter  before  the  ITC,  a  related  case  is  pending  before  the  Northern  District  of  California  Court  in 
Oakland,  California.   Subsequent  to  the  ITC’s  final  determination  finding  of  no  violation,  O2Micro  filed  a  motion  to 
dismiss  its  claims  for  infringement  of  the  '382  patent,  with  prejudice,  and  covenanted  not  to  sue  us  or  any  of  our 
distributors  or  customers  for  infringement  of  the  '382  patent.   On  June  23,  2010,  the  court  granted  this  motion  and 
vacated the jury trial that was scheduled on July 12, 2010.  We filed a motion seeking recovery of costs and attorney fees 
from  O2Micro.  On March 3, 2011, the court issued an order granting our  motion in part.  It ordered O2Micro to pay 
$339,315 in costs forthwith and ordered the parties to meet and confer to try to reach an agreement as to the reasonable 
attorneys fees to be paid.  If the parties are unable to reach an agreement, we are to submit detailed documentation to the 
court in support of our fees request. 

23 

 
  
  
 
 
 
  
 
  
  
 
  
  
Linear Technology Corporation 

On July 1, 2008, the United States District  Court  for the  District of  Delaware held as  a  matter of law that  we did not 
breach our October 1, 2005 Settlement and License Agreement with Linear Technology Corporation (“Linear”).  Based 
upon that ruling, we anticipate filing a motion to seek recovery of our attorney fees when the final judgment is entered. 
 The court has not issued its final judgment concerning the patent validity and enforceability issues.   

PART II 

ITEM 5.                Market for the Registrant’s Common Equity, Related Stockholders Matters, and Issuer 
Purchases of Equity Securities. 

Market Price of Our Common Stock 

Our common stock is traded on the Nasdaq Global Select Market under the symbol “MPWR”. The following table sets 
forth, for the periods indicated, the high and low sales price per share of our common stock on the Nasdaq Global Select 
Market. These prices represent quotations among dealers without adjustments for retail mark-ups, markdowns or 
commissions, and may not represent prices of actual transactions. 

2010 
Fourth Quarter ended December 31, 2010 
Third Quarter ended September 30, 2010 
Second Quarter ended June 30, 2010 
First Quarter ended March 31, 2010 

2009 
Fourth Quarter ended December 31, 2009 
Third Quarter ended September 30, 2009 
Second Quarter ended June 30, 2009 
First Quarter ended March 31, 2009 

Holders of Our Common Stock 

High 

Low 

  $ 
  $ 
  $ 
  $ 

  $ 
  $ 
  $ 
  $ 

18.52     $ 
19.90     $ 
25.34     $ 
24.50     $ 

24.75     $ 
25.26     $ 
23.40     $ 
16.90     $ 

14.75   
15.46   
17.34   
18.40   

18.93   
20.80   
14.92   
10.67   

As of February 22, 2011, we had approximately 22 stockholders of record and the closing price of common stock was 
$21.66 per share as reported by The Nasdaq Global Select Market.  Many of our shares of common stock are held by 
brokers  and  other  institutions  on  behalf  of  stockholders.  Based  on  several  factors,  including  our  proxy  mailing  from 
2010, we estimate the total number of stockholders represented by these record holders to be at least 1,452. 

Dividend Policy 

We have not paid cash dividends on our common stock since our inception. We currently expect to retain earnings for 
use in the operation and expansion of our business, and therefore do not anticipate paying any cash dividends for the next 
several years. 

Performance of Our Common Stock 

The following graph compares the cumulative 60-month total return provided shareholders on our common stock relative 
to the cumulative total returns of the Nasdaq Composite Index, the S & P 500 Index and the Philadelphia Semiconductor 
Index. An investment of $100 (with reinvestment of all dividends) is assumed to have been made in our common stock 
on 1/1/2010 and its relative performance is tracked through 12/31/2010. 

24 

 
 
 
  
   
  
 
  
    
  
   
    
        
    
    
        
    
  
   
  
  
  
  
  
The information contained in the Stock Performance Graph section shall not be deemed to be “soliciting material” or 
“filed”  or  incorporated  by  reference  in  future  filings  with  the  SEC,  or  subject  to  the  liabilities  of  Section  18  of  the 
Exchange Act, except to the extent that the Company specifically incorporates it by reference into a document filed under 
the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended. 

Recent Sales of Unregistered Securities 

There were no sales of unregistered securities during the year ended December 31, 2010. 

Purchases of Equity Securities by the Issuer and Affiliated Purchasers 

On  July  27,  2010,  the  Company  announced  that  its  Board  of  Directors  approved  a  stock  repurchase  program  that 
authorizes the Company to repurchase up to $50.0 million of its common stock between August 2, 2010 and December 
31,  2011.  In  February  2011,  the  Board  of  Directors  approved  an  increase  from  $50.0  million  to  $70.0  million.  As  of 
December 31, 2010, the following shares have been repurchased through the open market and subsequently retired: 

Average 
Price per 
Share 

Value 
(in thousands)   
16,998   
14,529   
31,527   

17.29      $ 
15.85      $ 
       $ 

2010 Calendar Year 
August 
November 

Total Shares Repurchased 

Shares 

Repurchased     

983,189      $ 
916,600      $ 
1,899,789       

25 

 
 
  
 
 
 
 
  
  
    
    
    
    
  
On  February  5,  2008,  the  Company  announced  that  its  Board  of  Directors  approved  a  stock  repurchase  program  that 
authorizes the Company to repurchase up to $25.0 million of its common stock through the end of 2008. As of December 
31, 2008, the following shares have been repurchased through the open market and subsequently retired: 

2008 Calendar Year 
February 
March 
April 
May 
June 
July 
August 
September 
October 

Total Shares Repurchased 

There were no shares repurchased in 2009. 

ITEM 6.                SELECTED FINANCIAL DATA 

Shares 

Repurchased     

Average 
Price per 
Share 

27,500      $ 
527,332      $ 
201,863     $ 
100     $ 
18,000     $ 
14,155     $ 
100     $ 
307,355     $ 
333,700     $ 
1,430,105       

Value 
(in thousands)   
464   
9,028   
4,043   
2   
390   
309   
2   
5,784   
5,021   
25,043   

16.88      $ 
17.12      $ 
20.03      $ 
21.98      $ 
21.66      $ 
21.86      $ 
22.03      $ 
18.82      $ 
15.05      $ 
       $ 

The following financial data is derived from our audited annual consolidated financial statements as of and for the years 
ended  December  31,  2010,  2009,  2008,  2007  and  2006.  You  should  read  the  following  table  in  conjunction  with  the 
consolidated  financial  statements  and  the  related  notes  contained  elsewhere  in  this  report  on  Form  10-K.  Operating 
results for any year are not necessarily indicative of results to be expected for any future periods. 

26 

 
  
  
    
 
 
 
    
    
    
    
 
 
 
    
    
    
    
    
    
  
 
  
 
Consolidated Statement of Operations Data: 

2010 

Year ended December 31, 
2008 
(in thousands, except per share amounts) 

2007 

2009 

2006 

Revenue 
Cost of revenue, including stock-based 
compensation* 
Gross profit 

Operating expenses: 
Research and development, including 
stock-based compensation* 
Selling, general and administrative, 
including stock-based compensation* 
Lease abandonment 
Litigation expense 
Patent litigation settlement (provision 
reversal) 
  Total operating expenses 

  $ 

218,840      $ 

165,008      $ 

160,511      $ 

134,004      $ 

105,015   

97,383        
121,457        

67,330        
97,678        

61,184        
99,327        

48,781        
85,223        

38,107   
66,908   

44,372        

38,295        

34,850        

27,342        

22,301   

41,169        
-        
5,418        

36,752        
-        
9,457        

35,256        
-        
6,714        

29,537        
(496 )      
9,370        

-        
90,959        

(6,356 )      
78,148        

-        
76,820        

9,800        
75,553        

27,594   
1,218   
11,560   

3,000   
65,673   

Income from operations 

30,498        

19,530        

22,507        

9,670        

1,235   

Other income (expense): 
Interest and other income 
Other expense 
  Total other income, net 

Income before income taxes 
Income tax provision 
Net income (loss) 

1,156        
(234 )      
922        

1,047        
(429 )      
618        

3,587        
(652 )      
2,935        

4,741        
(139 )      
4,602        

31,420        
1,857        
29,563        

20,148        
474        
19,674        

25,442        
1,216        
24,226        

14,272        
2,692        
11,580        

2,637   
(273 ) 
2,364   

3,599   
6,024   
(2,425 ) 

Basic income (loss) per share 
Diluted income (loss) per share 

  $ 
  $ 

0.83      $ 
0.78      $ 

0.57      $ 
0.54      $ 

0.72      $ 
0.67      $ 

0.37      $ 
0.33      $ 

(0.08 ) 
(0.08 ) 

Weighted-average common shares 
outstanding 
Stock options, restricted stock and 
warrants 
Diluted weighted-average common 
equivalent shares outstanding 

35,830        

34,310        

33,509        

31,703        

29,502   

1,996        

2,324        

2,611        

3,387        

-   

37,826        

36,634        

36,120        

35,090        

29,502   

* Stock-based compensation has been included in the following line 
items: 
    Cost of revenue 
    Research and development 
    Selling, general and administrative 
        Total 

393      $ 
6,742        
9,675        
16,810      $ 

  $ 

  $ 

246      $ 
6,408        
7,957        
14,611      $ 

344      $ 
5,821        
6,993        
13,158      $ 

539      $ 
4,625        
6,064        
11,228      $ 

539   
5,236   
5,749   
11,524   

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Consolidated Balance Sheet Data: 

Cash and cash equivalents 
Short-term investments 
Long-term investments 
Restricted cash 
Working capital 
Restricted assets 
Total assets 
Common stock 
Total stockholders' equity 

2010 

2009 

As of December 31, 
2008 
(in thousands) 

2007 

2006 

  $ 

48,010      $ 
129,709       
19,180       
-       
195,403       
-       
281,603       
178,269       
246,895       

46,717      $ 
118,914       
19,445       
-       
179,577       
-       
241,821       
175,518       
212,957       

83,266      $ 
21,922       
37,425       
7,360       
117,365       
7       
195,299       
147,298       
164,645       

83,114      $ 
27,765       
-       
7,350       
119,348       
8,340       
172,590       
143,890       
137,537       

50,816   
27,674   
-   
-   
77,111   
8,309   
117,327   
113,168   
95,025   

ITEM  7. 
RESULTS OF OPERATIONS 

      MANAGEMENT’S  DISCUSSION  AND  ANALYSIS  OF  FINANCIAL  CONDITION  AND 

The  following  discussion  should  be  read  in  conjunction  with  the  consolidated  financial  statements  and  related  notes 
which appear elsewhere in this annual report on Form 10-K. 

Overview 

We are a fabless semiconductor company that designs, develops, and markets proprietary, advanced analog and mixed-
signal semiconductors. We currently offer products that serve multiple markets, including flat panel televisions, wireless 
communications,  telecommunications  equipment,  general  consumer  products,  notebook  computers,  cellular  handsets, 
and set top boxes, among others. We believe that we differentiate ourselves by offering solutions that are more highly 
integrated,  smaller  in  size,  more  energy  efficient,  more  accurate  with  respect  to  performance  specifications  and, 
consequently,  more  cost-effective  than  many  competing  solutions.  We  plan  to  continue  to  introduce  additional  new 
products within our existing product families, as well as in new product categories. 

We operate in the cyclical semiconductor industry where there is seasonal demand for certain of our products. We are 
not and will not be immune from current and future industry downturns, but we have targeted product and market areas 
that we believe have the ability to offer above average industry performance over the long term. 

We work with third parties to manufacture and assemble our integrated circuits (“ICs”). This has enabled us to limit our 
capital expenditures and fixed costs, while focusing our engineering and design resources on our core strengths. 

Following the introduction of a product, our sales cycle generally takes six to twelve months to achieve revenue. Volume 
production  is  usually  achieved  in  three  to  six  months  after  we  receive  an  initial  customer  order  for  a  new  product. 
Typical  lead  times  for  orders  are  fewer  than  90  days.  These  factors,  combined  with  the  fact  that  orders  in  the 
semiconductor industry can typically be cancelled or rescheduled without significant penalty to the customer, make the 
forecasting of our orders and revenue difficult. 

We derive most of our revenue from sales through distribution arrangements or direct sales to customers in Asia, where 
the components we produce are incorporated into an end-user product. 87% of our revenue for the year ended December 
31, 2010 and 84% of our revenue for the year ended December 31, 2009 was attributable to direct or indirect sales to 
customers in Asia. We derive a majority of our revenue from the sales of our DC to DC converter product family which 
services the consumer electronics, communications and computing markets. We believe our ability to achieve revenue 
growth  will  depend,  in  part,  on  our  ability  to  develop  new  products,  enter  new  market  segments,  gain  market  share, 
manage litigation risk, diversify our customer base and successfully secure manufacturing capacity. 

Critical Accounting Policies and Estimates 

Our discussion and analysis of our financial condition and results of operations are based upon our consolidated financial 
statements,  which  have  been  prepared  in  accordance  with  generally  accepted  accounting  principles  in  the  U.S.  The 
preparation of these financial statements requires us to make estimates and judgments that affect the reported amount of 
assets,  liabilities,  revenue  and  expenses,  and  related  disclosure  of  contingent  assets  and  liabilities.  We  evaluate  our 

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estimates  on  an  on-going  basis,  including  those  related  to  revenue  recognition,  stock-based  compensation,  long-term 
investments,  short-term  investments,  inventories,  income  taxes,  warranty  obligations  and  contingencies.  We  base  our 
estimates  on  historical  experience  and  on  various  other  assumptions  that  are  believed  to  be  reasonable  under  the 
circumstances,  the  results  of  which  form  the  basis  for  making  the  judgments  about  the  carrying  values  of  assets  and 
liabilities  that  are  not  readily  apparent  from  other  sources.  Estimates  and  judgments  used  in  the  preparation  of  our 
financial  statements  are,  by  their  nature,  uncertain  and  unpredictable,  and  depend  upon,  among  other  things,  many 
factors  outside  of  our  control,  such  as  demand  for  our  products  and  economic  conditions.  Accordingly,  our  estimates 
and judgments may prove to be incorrect and actual results may differ, perhaps significantly, from these estimates. 

We believe the following critical accounting policies reflect our more significant judgments used in the preparation of 
our consolidated financial statements. 

Revenue  Recognition.  We  recognize  revenue  in  accordance  with  Financial  Accounting  Standards  Board  (“FASB”)  – 
Accounting  Standards  Codification  (“ASC”)  605-10-S25  Revenue  Recognition  –  Overall  –  Recognition.  ASC  605-10-
S25  requires  that  four  basic  criteria  must  be  met  before  revenue  can  be  recognized:  (1)  persuasive  evidence  of  an 
arrangement exists; (2) delivery has occurred or services have been rendered; (3) the fee is fixed and determinable; and 
(4)  collectibility  is  reasonably  assured.  Determination  of  criteria  (3)  and  (4)  are  based  on  management’s  judgment 
regarding the fixed nature of the fee charged for products delivered and the collectibility of those fees. The application of 
these criteria has resulted in our generally recognizing revenue upon shipment (when title passes) to customers. Should 
changes in conditions cause management to determine these criteria are not met for certain future transactions, revenue 
recognized for any reporting period could be adversely impacted. 

Approximately 85% of our distributor sales, including sales to our value-added resellers, are made through distribution 
arrangements  with  third  parties.  These  arrangements  do  not  include  any  special  payment  terms  (our  normal  payment 
terms  are  30-45  days  for  our  distributors,  with  value-added  resellers  having  payment  terms  up  to  90  days),  price 
protection or exchange rights. Returns are limited to our standard product warranty. Certain of our large distributors have 
contracts that include limited stock rotation rights that permit the return of a small percentage of the previous six months’ 
purchases in return for a compensating new order of equal or greater dollar value. 

We  maintain  a  sales  reserve  for  stock  rotation  rights,  which  is  based  on  historical  experience  of  actual  stock  rotation 
returns on a per distributor basis, where available, and information related to products in the distribution channel. This 
reserve is recorded at the time of sale. In the future, if we are unable to estimate our stock rotation returns accurately, we 
may not be able to recognize revenue from sales to our distributors based on when we sell inventory to our distributors. 
Instead, we may have to recognize revenue when the distributor sells through such inventory to an end-customer. 

We generally recognize revenue upon shipment of products to the distributor for the following reasons (based on ASC 
605-15-25-1 Revenue Recognition – Products – Recognition – Sales of Products When Right of Return Exists): 

(1)  Our  price  is  fixed  and  determinable  at  the  date  of  sale.  We  do  not  offer  special  payment  terms,  price 

protection or price adjustments to distributors where we recognize revenue upon shipment 

(2)  Our distributors are obligated to pay us and this obligation is not contingent on the resale of our products 
The distributor’s obligation is unchanged in the event of theft or physical destruction or damage to the 
(3) 
products 

(4)  Our distributors have stand-alone economic substance apart from our relationship 
(5)  We do not have any obligations for future performance to directly bring about the resale of our products 

(6) 

by the distributor 
The  amount  of  future  returns  can  be  reasonably  estimated.  We  have  the  ability  and  the  information 
necessary  to  track  inventory  sold  to  and  held  at  our  distributors.  We  maintain  a  history  of  returns  and 
have the ability to estimate the stock rotation returns on a quarterly basis. 

If  we  enter  into  arrangements  that  have  rights  of  return  that  are  not  estimable,  we  recognize  revenue  under  such 
arrangements only after the distributor has sold our products to an end customer. 

Approximately  15%  of  our  distributor  sales  are  made  through  small  distributors  based  on  purchase  orders  rather  than 
formal distribution arrangements.  These distributors do not receive any stock rotation rights and, as such, hold very little 
inventory, if any.  We do not have a history of accepting returns from these distributors. 

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The terms in a majority of our distribution agreements include the non-exclusive right to sell, and the agreement to use 
best efforts to promote and develop a market for, our products in certain regions of the world and the ability to terminate 
the distribution agreement by either party with up to three months notice. We provide a one year warranty against defects 
in  materials  and  workmanship.  Under  this  warranty,  we  will  repair  the  goods,  provide  replacements  at  no  charge,  or, 
under  certain  circumstances,  provide  a  refund  to  the  customer  for  defective  products.  Estimated  warranty  returns  and 
warranty costs are based on historical experience and are recorded at the time product revenue is recognized. 

In 2006,  we  signed a distribution agreement  with a  U.S. distributor. Revenue from this  distributor is recognized upon 
sale by the distributor to the end customer because the distributor has certain rights of return which management believes 
are  not  estimable.  The  deferred  revenue  balance  from  this  distributor  as  of  December  31,  2010  and  2009  was  $1.0 
million and $0.9 million, respectively. 

Inventory  Valuation. We  value  our  inventory  at  the  lower  of  the  standard  cost  (which  approximates  actual  cost  on  a 
first-in,  first-out  basis)  or  its  current  estimated  market  value.  We  write  down  inventory  for  obsolescence  or  lack  of 
demand, based on assumptions about future demand and market conditions. If actual market conditions are less favorable 
than  those  projected  by  management,  additional  inventory  write-downs  may  be  required.  On  the  contrary,  if  market 
conditions are more favorable, we may be able to sell inventory that was previously reserved. 

Accounting  for  Income  Taxes. ASC  740-10  Income  Taxes  –  Overall  prescribes  a  recognition  threshold  and 
measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be 
taken in a tax return. This interpretation also provides guidance on derecognition, classification, interest and penalties, 
accounting in interim periods and disclosure. In accordance  with ASC 740-10,  we recognize  federal, state and foreign 
current  tax  liabilities  or  assets  based  on  our  estimate  of  taxes  payable  or  refundable  in  the  current  fiscal  year  by  tax 
jurisdiction. We also recognize federal, state and foreign deferred tax assets or liabilities for our estimate of future tax 
effects attributable to temporary differences and carryforwards. We record a valuation allowance to reduce any deferred 
tax  assets  by  the  amount  of  any  tax  benefits  that,  based  on  available  evidence  and  judgment,  are  not  expected  to  be 
realized. 

Our calculation of current and deferred tax assets and liabilities is based on certain estimates and judgments and involves 
dealing with uncertainties in the application of complex tax laws. Our estimates of current and deferred tax assets and 
liabilities may change based, in part, on added certainty or finality or uncertainty to an anticipated outcome, changes in 
accounting or tax laws in the U.S., or foreign jurisdictions where we operate, or changes in other facts or circumstances. 
In addition, we recognize liabilities for potential U.S. and foreign income tax for uncertain income tax positions taken on 
our tax returns if it has less than a 50% likelihood of being sustained. If we determine that payment of these amounts is 
unnecessary  or  if  the  recorded  tax  liability  is  less  than  our  current  assessment,  we  may  be  required  to  recognize  an 
income tax benefit or additional income tax expense in our financial statements in the period such determination is made. 
We  have  calculated  our  uncertain  tax  positions  which  were  attributable  to  certain  estimates  and  judgments  primarily 
related to transfer pricing, cost sharing and our international tax structure exposure. 

As  of  December  31,  2010,  2009  and  2008,  we  had  a  valuation  allowance  of  $16.8  million,  $14.6  million  and  $14.4 
million,  respectively,  attributable  to  management’s  determination  that  none  of  the  deferred  tax  assets  will  be  realized, 
except  for  certain  deferred  tax  assets  related  to  uncertain  income  tax  positions.  As  a  result  of  the  cost  sharing 
arrangements  with the Company’s international subsidiaries (cost share arrangements), relatively small changes in costs 
that are not subject to sharing under the cost share arrangements can significantly impact the overall profitability of the 
US entity.   Historically, the US operations have shown an inconsistent earnings pattern due to litigation costs not subject 
to  cost  sharing.  The  Company  evaluated  its  US  valuation  allowance  at  December  31,  2010  by  reviewing  both  its 
earnings  history  and  its  expected  earnings  for  the  next  12  months  in  its  US  entity.  Because  of  the  US  entity’s 
inconsistent earnings history and uncertainty of future earnings, the Company has determined that it is more likely than 
not that the US deferred tax benefits would not be realized.  We have settled most of our legacy litigation matters that 
resulted  in  litigation  cost  that  were  not  subject  to  cost  share  in  the  past.  As  a  result,  during  our  next  fiscal  year,  a 
relatively small number of design wins in the US, and the absence of new litigation that may be not subject to cost share 
may  position  the  US  entity  for  a  stable  earnings  pattern.  As  such,  we  will  continue  to  evaluate  if  our  facts  and 
circumstances warrant a reversal of the valuation allowance against the US deferred tax benefits during fiscal year 2011. 

Contingencies. We are engaged in legal proceedings regarding our intellectual property, challenges to the enforceability 
or validity of our intellectual property and claims that our products infringe on the intellectual property rights of others. 
In addition, from time to time, we become aware that we are subject to other contingent liabilities. When this occurs, we 
will evaluate the appropriate accounting for the potential contingent liabilities using ASC 450-20-25-2 Contingencies – 

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Loss  Contingencies  -  Recognition  to  determine  whether  a  contingent  liability  should  be  recorded.  In  making  this 
determination, management may, depending on the nature of the matter, consult with internal and external legal counsel 
and technical experts. Based on the facts and circumstances in each matter, we use our judgment to determine whether it 
is probable that a contingent loss has occurred and whether the amount of such loss can be estimated. If we determine a 
loss  is  probable  and  estimable,  we  record  a  contingent  loss  in  accordance  with  ASC  450-20-25-2.  In  determining  the 
amount of a contingent loss,  we take into account advice received from experts  for each specific  matter regarding the 
status of legal proceedings, settlement negotiations (which may be ongoing), prior case history and other factors. Should 
the judgments and estimates made by management need to be adjusted as additional information becomes available, we 
may  need  to  record  additional  contingent  losses  that  could  materially  and  adversely  impact  our  results  of  operations. 
Alternatively, if the judgments and estimates made by management are adjusted, for example, if a particular contingent 
loss  does  not  occur,  the  contingent  loss  recorded  would  be  reversed  which  could  result  in  a  favorable  impact  on  our 
results of operations. 

Accounting  for  Stock-Based Compensation. We  account  for  stock-based  compensation  in  accordance  with  ASC  718-
10-30 Compensation – Stock Compensation – Overall – Initial Measurement,  under the  modified prospective  method. 
ASC  718-10-30  eliminates  the  alternative  of  applying  the  intrinsic  value  measurement  to  stock  compensation  awards 
issued to employees. Rather, the standard requires us to measure the cost of employee services received in exchange for 
an award of equity instruments based on the grant-date  fair value of the award. That cost  will be recognized over the 
period  during  which  an  employee  is  required  to  provide  services  in  exchange  for  the  award,  known  as  the  requisite 
service period (usually the vesting period). We currently use the Black-Scholes option-pricing model to estimate the fair 
value  of  our  share-based  payments.  The  Black-Scholes  option-pricing  model  is  based  on  a  number  of  assumptions, 
including historical volatility, expected life, risk-free interest rate and expected dividends. If these assumptions change, 
stock-based compensation may differ significantly from what we have recorded in the past. The amount of stock-based 
compensation that we recognize is also based on an expected forfeiture rate. If there is a difference between the forfeiture 
assumptions used in determining stock-based compensation costs and the actual forfeitures which become known over 
time,  we  may  change  the  forfeiture  rate,  which  could  have  a  significant  impact  on  our  stock-based  compensation 
expense. 

Warranty Reserves. We currently provide a 12-month warranty against defects in materials and workmanship and will 
either repair the goods or provide replacement products at no charge to the customer for defective products. We record 
estimated warranty costs by product, which are based on historical experience over the preceding 12 months, at the time 
we recognize product revenue. Reserve requirements are recorded in the period of sale and are based on an assessment of 
the  products  sold  with  warranty  and  historical  warranty  costs  incurred.  There  have  been  situations  where  we  have 
recognized  warranty  reserves  for  specific  claims,  separate  from  our  historical  run  rates.  As  the  complexity  of  our 
products increases, we could experience higher warranty claims relative to sales than we have previously experienced, 
and we may need to increase these estimated warranty reserves. 

Fair  Value  of  Financial  Instruments.  ASC  820-10  Fair  Value  Measurements  and  Disclosures  –  Overall  defines  fair 
value, establishes a framework for measuring fair value in generally accepted accounting principles in the United States 
of  America,  and  requires  that  assets  and  liabilities  carried  at  fair  value  be  classified  and  disclosed  in  one  of  the  three 
categories, as follows: 

• 
• 
• 

Level 1: Quoted prices in active markets for identical assets; 
Level 2: Significant other observable inputs; and 
Level 3: Significant unobservable inputs. 

ASC 820-10-35-51 Fair Value Measurement and Disclosure – Overall – Subsequent Measurement – Determining Fair 
Value  When  the  Volume  and  Level  of  Activity  for  the  Asset  or  Liability  Have  Significantly  Decreased  and  Identifying 
Transactions That Are Not Orderly provides additional guidance for estimating fair value in accordance with ASC 820-
10 Fair Value Measurements and Disclosures – Overall, when the volume and level of activity for the asset or liability 
have significantly decreased. 

Our financial instruments include cash and cash equivalents and short-term and long-term investments. Cash equivalents 
are  stated  at  cost,  which  approximates  fair  market  value  based  on  quoted  market  prices.  Short-term  and  long-term 
investments are stated at their fair market value. 

At  December  31,  2010,  the  face  value  of  our  holdings  in  auction  rate  securities  was  $20.2  million,  all  of  which  was 
classified  as  long-term  available-for-sale  investments.  Investments  in  available-for-sale  securities  are  recorded  at  fair 

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value, and unrealized gains or losses (that are deemed to be temporary) are recognized through shareholders' equity, as a 
component  of  accumulated  other  comprehensive  income  in  our  consolidated  balance  sheet.  We  record  an  impairment 
charge to earnings when an available-for-sale investment has experienced a decline in value that is deemed to be other-
than-temporary.  Investments  in  trading  securities  are  recorded  at  fair  value  and  unrealized  gains  and  losses  are 
recognized in other income (expense) in our consolidated statement of operations. 

We  adopted  the  provisions  of  ASC  320-10-35  Investments  –  Debt  and  Equity  Securities  –  Overall  –  Subsequent 
Measurement and  ASC 320-10-50 Investments – Debt and Equity Securities – Overall - Disclosure, effective  April 1, 
2009 and used the guidelines therein to determine whether the impairment is temporary or other-than temporary. Other-
than-temporary impairment charges exist when the entity has the intent to sell the security or it will more likely than not 
be required to sell the security before anticipated recovery. During the year ended December 31, 2009, we recognized a 
credit  loss  of  $70,000,  which  was  deemed  to  be  other-than-temporary  in  other  income  (expense)  in  our  Consolidated 
Statement of Operations. 

Based on certain assumptions described in Note 2 to our consolidated financial statements and the Liquidity and Capital 
Resources section of Part II, Item 7 of this annual report on Form 10-K, we recorded impairment charges on our holdings 
in auction-rate securities. The valuation of these securities is subject to fluctuations in the future, which will depend on 
many factors, including the collateral quality, potential to be called or restructured, underlying final maturity, insurance 
guaranty, liquidity and market conditions, among others. 

Recent Accounting Pronouncements 

In  October  2009,  the  Financial  Accounting  Standards  Board  (“FASB”) issued  Accounting  Standards  Update  ("ASU") 
No. 2009-13,  "Multiple-Deliverable  Revenue  Arrangements"  ("ASU  2009-13").  The  new  standard  changes  the 
requirements for establishing separate units of accounting in a multiple element arrangement and requires the allocation 
of arrangement consideration to each deliverable to be based on the relative selling price. ASU 2009-13 is effective for 
fiscal years beginning on or after June 15, 2010. We are currently evaluating ASU 2009-13 and the impact, if any, that it 
may have on our results of operations or financial position. 

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Results of Operations 

 The table below shows the Consolidated Statements of Operations amounts (in thousands) and shows each as a 
percentage of revenue. 

2010 

Year ended December 31, 
2009 
(in thousands, except percentages) 

2008 

Revenue 
Cost of revenue 
Gross profit 

  $ 218,840        
     97,383        
    121,457        

100.0 %   $ 165,008        
     67,330        
     97,678        

44.5   
55.5   

100.0 %   $ 160,511        
     61,184        
     99,327        

40.8   
59.2   

100.0 % 
38.1   
61.9   

Operating expenses: 
     Research and development 
     Selling, general and administrative 
     Litigation expense 
     Patent litigation settlement (provision 
reversal) 
          Total operating expenses 

     44,372        
     41,169        
5,418        

20.3   
18.8   
2.5   

     38,295        
     36,752        
9,457        

23.3   
22.3   
5.7   

     34,850        
     35,256        
6,714        

-        
     90,959        

-   
41.6   

(6,356 )     
     78,148        

(3.9 )      
47.4   

-        
     76,820        

21.7   
22.0   
4.2   

-   
47.9   

Income from operations 

     30,498        

13.9   

     19,530        

11.8   

     22,507        

14.0   

Interest and other income 
Other expense 
          Total other income, net 

1,156        
(234 )     
922        

0.6   
(0.1 )      
0.5   

1,047        
(429 )     
618        

0.6   
(0.2 )      
0.4   

3,587        
(652 )     
2,935        

2.2   
(0.4 ) 
1.8   

Income before income taxes 
Income tax provision 

     31,420        
1,857        

14.4   
0.9   

     20,148        
474        

12.2   
0.3   

     25,442        
1,216        

15.9   
0.8   

Net income 

  $  29,563        

13.5 %   $  19,674        

11.9 %   $  24,226        

15.1 % 

The following table shows our revenue by product family (amounts in thousands, except percentages): 

Year ended December 31, 

Percent Change 

   2010 

% of 

Revenue       2009 

% of 
Revenue   

   2008 

% of 

Revenue      

2010 to 2009  
Change 

2009 to 2008  
Change 

Product Family 
DC to DC 
Converters 
Lighting Control 
Products 
Audio Amplifiers      

Total 

  $ 183,051       

83.7 %   $  123,581       

74.9 %   $  115,373       

71.9 %   

48.1%     

7.1% 

     28,554       
7,235       

13.0 %      27,836       
3.3 %      13,591       
  $ 218,840        100.0 %   $  165,008       

16.9 %      32,308       
8.2 %      12,830       

20.1 %   
8.0 %   
100.0 %    $  160,511        100.00 %     

2.6%     
(46.8%)     

(13.8%) 
5.9% 

Revenue. Revenue for the year ended December 31, 2010 was $218.8 million, an increase of $53.8 million, or 32.6%, 
from $165.0 million for the year ended December 31, 2009. Sales during the first three quarters of 2010 were strong for 
MPS  and  the  semiconductor  industry  in  general.  However,  due  to  product  shortages  early  in  2010,  several  major 
customers in Korea sought alternative suppliers, which impacted our revenue in the fourth quarter and may continue to 
impact  our  revenue  in  future  periods.  In  addition,  in  the  fourth  quarter  of  2010,  sales  were  lower  because  distributors 
used  up inventory that  was shipped in the  third quarter and the  general demand  for consumer products declined  more 
than  seasonally.  Sales  during  2009  were  generally  weak,  primarily  from  the  deterioration  in  the  general  demand  for 
electronic products as a result of a worldwide financial crises and associated macro-economic slowdowns. 

In  2010,  we  saw  an  increase  in  demand  for  our  DC  to  DC  products,  with  sales  having  increased  by  $59.5  million  or 
48.1% over sales in 2009. The increase was primarily because of higher demand for electronic products in the consumer 
and communications markets. Sales of our lighting control products increased slightly as a result of greater demand for 

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our WLED solution  for consumer electronics products. This  was partially offset by a reduction in the demand for our 
CCFL products. Audio sales were down year over year due to lower demand and a decline in the average selling price 
for certain of our audio products. 

Revenue for the year ended December 31, 2009 was $165.0 million, an increase of $4.5 million, or 2.8%, from $160.5 
million  for  the  year  ended  December  31,  2008. The  increase  in  revenue  between  these  two  periods  resulted  primarily 
from  increased  sales  of  our  DC  to  DC  products  of  $8.2  million  as  a  result  of  an  increase  in  demand  for  electronic 
products in the consumer and communications markets. This was partially offset by a decrease in the sales of our lighting 
control products in the amount of $4.5 million as a result of the continuing shift of notebook backlighting from CCFL 
solutions to WLED solutions. Sales for our audio products for the year ended December 31, 2009 remained relatively flat 
year over year. 

Gross Profit. Gross profit as a percentage of revenue, or gross margin, was 55.5% for the year ended December 31, 2010 
and 59.2% for the year ended December 31, 2009. Gross margin declined year-over-year as a result of a change in the 
product mix, higher product costs from increased wafer and gold costs, underutilized capacity towards the end of 2010 
and an increase in inventory reserves. 

Gross profit as a percentage of revenue was 59.2% for the year ended December 31, 2009 and 61.9% for the year ended 
December 31, 2008. Gross margin declined year-over-year as a result of increasing price pressure and therefore declining 
average selling prices, and an increase in inventory reserves resulting from a decrease in the general demand for certain 
of our lighting control products. 

Research  and  Development.  Research  and  development  (R&D)  expenses  consist  of  salary  and  benefit  expenses  for 
design and product engineers, expenses related to new product development, and related facility costs.  

Revenue 
Research and development ("R&D"), excluding 
stock-based compensation 
R&D stock-based compensation 
Total R&D 
R&D as a percentage of net revenue 

Year ended December 31, 

2010 
2009 
(in thousands, except percentages) 
  $  218,840      $  165,008      $  160,511        

2008 

37,630        
6,742        
44,372      $ 
20.3 %     

31,887        
6,408        
38,295      $ 
23.2 %     

29,029        
5,821        
34,850        
21.7 %     

  $ 

   Percentage Change 
2009 to 
2008 

2010 to 
2009 

32.6 %     

2.8 % 

18.0 %     
5.2 %     
15.9 %     

9.8 % 
10.1 % 
9.9 % 

R&D expenses were $44.4 million, or 20.3% of revenue, for the year ended December 31, 2010 and $38.3 million, or 
23.2% of revenue, for the year ended December 31, 2009. The year-over-year increase was primarily due to an increase 
in variable compensation, facilities costs and costs associated with new product development. 

R&D expenses were $38.3 million, or 23.2% of revenue, for year ended December 31, 2009 and $34.9 million, or 21.7% 
of  revenue,  for  the  year  ended  December  31,  2008.  The  year-over-year  increase  was  primarily  due  to  an  increase  in 
personnel  and  new  product  development  expenses  to  support  new  product  development.  Stock-based  compensation 
expenses increased by $0.6 million, primarily due to the acceleration of certain awards. 

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Selling, General and Administrative. Selling, general and administrative (SG&A) expenses include salary and benefit 
expenses for sales, marketing and administrative personnel, sales commissions, travel expenses, related facilities costs, 
outside legal and accounting fees, and fees associated with Sarbanes-Oxley compliance requirements. 

Revenue 
Selling, general and administrative ("SG&A"), 
excluding stock-based compensation 
SG&A stock-based compensation 
Total SG&A 
SG&A as a percentage of net revenue 

  Year ended December 31, 

2009 
2010 
(in thousands, except percentages) 
  $  218,840      $  165,008      $  160,511        

2008 

31,494        
9,675        
41,169      $ 
18.8 %     

28,795        
7,957        
36,752      $ 
22.3 %     

28,263        
6,993        
35,256        
22.0 %     

  $ 

   Percentage Change 
2009 to 
2008 

2010 to 
2009 

32.6 %     

2.8 % 

9.4 %     
21.6 %     
12.0 %     

1.9 % 
13.8 % 
4.2 % 

SG&A expenses were $41.2 million, or 18.8% of revenue, for the year ended December 31, 2010 and $36.8 million, or 
22.3% of revenue, for the year ended December 31, 2009. SG&A as a percentage of revenue declined compared to the 
corresponding  period  in  the  prior  year  due  to  the  efficiencies  of  greater  scale  from  increased  revenues.  Total  SG&A 
expenses  increased  year  over  year  due  to  higher  stock-based  compensation  expenses  and  an  increase  in  sales 
commissions and other variable compensation as a result of increased revenue in 2010. 

SG&A expenses were $36.8 million, or 22.3% of revenue, for the year ended December 31, 2009 and $35.3 million, or 
22.0%  of  revenue,  for  the  year  ended  December  31,  2008.  For  the  year  ended  December  31,  2009,  SG&A  expenses 
increased compared to the corresponding period in the prior year due to an increase in sales and sales-related expenses. 
Stock-based  compensation  increased  by  $1.0  million,  primarily  related  to  certain  severance  arrangements  and  the 
acceleration of certain awards. 

Litigation Expense, excluding Patent Litigation Settlement and Provision Reversal, net. 

Year ended December 31, 

Revenue 
Litigation expense 
Litigation expense as a percentage of net 
revenue 

2009 
2010 
(in thousands, except percentages) 
  $  218,840      $  165,008      $  160,511        
6,714        

5,418        

9,457        

2008 

2.5 %     

5.7 %     

4.2 %     

   Percentage Change 
2009 to 
2008 

2010 to 
2009 

32.6 %      
(42.7 %)     

2.8 % 
40.9 % 

Litigation  expenses,  excluding  patent  litigation  settlements  and  provision  reversals  were  $5.4  million,  or  2.5%  of 
revenue,  for  the  year  ended  December  31,  2010  as  compared  to  $9.5  million,  or  5.7%  of  revenue,  for  the  year  ended 
December  31,  2009.  As  a  result  of  settling  our  lawsuits  involving  O2Micro  in  the  second  quarter  of  2010,  our  legal 
expenses were significantly lower in 2010 compared to 2009. 

Litigation  expenses,  excluding  patent  litigation  settlements  and  provision  reversals  were  $9.5  million,  or  5.7%  of 
revenue,  for  the  year  ended  December  31,  2009  as  compared  to  $6.7  million,  or  4.2%  of  revenue,  for  the  year  ended 
December  31,  2008.  During  the  year  ended  December  31,  2009,  we  incurred  significant  legal  expenses  to  defend  our 
lawsuit against O2Micro. During the year ended December 31, 2008, we incurred significant legal expenses to defend 
our lawsuit against Linear Technology. 

For  a  more  complete  description  of  our  litigation  matters,  please  see  Part  I,  Item  3  “Legal  Proceedings”  and  Note  10 
“Litigation” of Notes to Consolidated Financial Statements. 

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Patent Litigation Settlement (Provision Reversal, net). 

  Year ended December 31, 

2010 
(in thousands, except percentages) 

2008 

2009 

   Percentage Change 
2009 to 
2008 

2010 to 
2009 

Revenue 
Patent litigation settlement (provision reversal)      
Patent litigation settlement (provision reversal) 
as a percentage of net revenue 

  $  218,840      $  165,008   
(6,356 ) 
-        

  $  160,511        
-        

32.6 %     

2.8 % 

0.0 %     

(3.9 %)     

0.0 %     

There were no patent litigation settlements or provision reversals in 2010. Patent litigation provision reversal, net  was 
$6.4  million  for  the  year  ended  December  31,  2009.  In  2009,  we  completed  the  litigation  process  with  respect  to  the 
lawsuit related to TSE, a customer.  The conclusion of this lawsuit resulted in recording a reversal of a patent litigation 
provision  of  approximately  $7.4  million.  This  provision  was  recorded  as  a  patent  litigation  provision  in  the  second 
quarter of 2007 and the reversal of this provision in 2009 is reflected in the Patent Litigation Settlement and Provision 
Reversal, net item in the Consolidated Statement of Operations.  In connection with the completion of this lawsuit, the 
Company also jointly terminated an escrow agreement with TSE and retrieved the deposit of $7.4 million. This recovery 
was reduced by certain litigation stipulations for other parties involved in the case in the amount of $1.0 million. 

Interest and Other Income. For the years ended December 31, 2010, 2009 and 2008, interest and other income was $1.2 
million, $1.0 million and $3.6 million, respectively. Interest rates remained low in 2010, resulting in a small increase in 
interest income as our cash and investment balances grew year over year. For the years ended December 31, 2009 and 
2008, despite year over year increases in cash, cash equivalents and investment balances, interest income decreased due 
to significant declines in interest rates as a result of the economic downturn. 

Other Expense. Other expense, comprised mainly of foreign exchange losses,  was $0.2 million, $0.4 million and $0.7 
million for the years ended December 31, 2010, 2009 and 2008, respectively. 

Income Tax Provision. The income tax provision for the year ended December 31, 2010 was $1.9 million or 5.9% of our 
income before income taxes. This was lower than the federal statutory rate of 34% primarily because our foreign income 
was taxed at lower rates and because of the benefit that we realized as a result of stock options exercised and restricted 
units released. 

The  income  tax  provision  for  the  year  ended  December  31,  2009  was  $0.5  million  or  2.4%  of  the  pre-tax  income, 
respectively. This differs from the U.S. federal statutory rate of 34% primarily because our foreign income is taxed at 
lower rates and because of the benefit that we realized as a result of stock options exercised and restricted units released. 

The income tax provision for the year ended December 31, 2008 was $1.2 million or 4.8% of our income before income 
taxes. This was lower than the U.S. federal statutory rate of 34% due primarily to a benefit from earnings in low foreign 
tax  jurisdictions  and  a  decrease  in  prior-year  uncertain  tax  position  reserves  under  ASC  740-10,  which  was  partially 
offset by an increase in current-year ASC 740-10 reserves, additional ASC 740-10 interest accruals, an increase in the 
valuation allowance in the U.S. and non-deductible stock option compensation expenses. 

For additional information, see Note 8 “Income Taxes” of the Notes to Consolidated Financial Statements. 

Liquidity and Capital Resources 

As  of  December  31,  2010,  we  had  working  capital  of  $195.4  million,  including  cash  and  cash  equivalents  of  $48.0 
million and short-term investments of $129.7 million compared to working capital of $179.6 million, including cash and 
cash equivalents of $46.7 million and short-term investments of $118.9 million as of December 31, 2009. Our working 
capital increased year-over-year primarily due to cash generated from operating activities and the proceeds received from 
the exercise of options and from the employee stock purchase program. 

For  the  year  ended  December  31,  2010,  net  cash  provided  by  operating  activities  was  $48.5  million,  primarily  due  to 
strong operating results, partially offset by an increase in inventory to support the deliveries in the first quarter of 2011. 

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For  the  year  ended  December  31,  2009,  net  cash  provided  by  operating  activities  was  $31.8  million,  primarily  due  to 
strong operating results during the  year. This  was offset by an increase in accounts receivable as a result of increased 
shipments at the end of the quarter ended December 31, 2009 for which collections had not yet been made and a decrease 
in accrued and long-term liabilities. For the year ended December 31, 2008, net cash provided by operating activities was 
$39.6 million, primarily due to strong operating results. 

For the year ended December 31, 2010, net cash used in investing activities was $33.8 million, primarily related to the 
Chengdu  building  construction  and  equipment  purchases  for  our  Chengdu  facility  and  the  net  purchase  of  short-term 
investments. For the year ended December 31, 2009, net cash used in investing activities was $82.1 million, primarily 
related to the net purchase of short-term investments. For the year ended December 31, 2008, net cash used in investing 
activities was $29.6 million, primarily related to the purchase of $28.1 million in auction-rate securities, which became 
illiquid in February 2008, and the purchase of $5.2 million in capital equipment. This was offset by the release of $8.6 
million in restricted assets as a result of an agreement between O2Micro and us relating to certain legal proceedings in 
Taiwan. 

We  use  professional  investment  management  firms  to  manage  the  majority  of  our  invested  cash.  Our  fixed  income 
portfolio  is  primarily  invested  in  municipal  bonds,  government  securities,  auction-rate  securities  and  highly  rated 
corporate notes. The balance of the fixed income portfolio is managed internally and invested primarily in money market 
funds for working capital purposes. 

We  adopted  the  provisions  of  ASC  320-10-35  Investments  –  Debt  and  Equity  Securities  –  Overall  –  Subsequent 
Measurement and  ASC 320-10-50 Investments – Debt and Equity Securities – Overall - Disclosure, effective  April 1, 
2009  and  used  the  guidelines  therein  to  determine  whether  the  impairment  is  temporary  or  other-than  temporary. 
Temporary impairment charges are recorded in accumulated other comprehensive income (loss) within equity and have 
no  impact  on  net  income.  Other-than-temporary  impairment  charges  exist  when  the  entity  has  the  intent  to  sell  the 
security or it will more likely than not be required to sell the security before anticipated recovery. Other-than-temporary 
impairment charges are recorded in other income (expenses) in the Consolidated Statement of Operations. 

At December 31, 2010, the Company’s investment portfolio included $19.2 million, net of impairment charges of $1.0 
million,  in  government-backed  student  loan  auction-rate  securities.  The  underlying  maturity  of  these  auction-rate 
securities is up to 37 years. Although it is unclear as to when these investments will regain their liquidity, management 
has  concluded  that  as  of  December  31,  2010  and  2009,  the  cumulative  impairment  of  $1.0  million  and  $1.1  million, 
respectively, was temporary based on the following analysis: 

1.  The decline in the fair value of these securities is not attributable to adverse conditions specifically 

related to these securities or to specific conditions in an industry or in a geographic area; 

2.  Management  possesses  both  the  intent  and  ability  to  hold  these  securities  for  a  period  of  time 

sufficient to allow for any anticipated recovery in fair value; 

3.  Management believes that it is more likely than not that the Company will not have to sell these 

securities before recovery of its cost basis; 

4.  Except  for  the  credit  loss  of  $70,000  recognized  in  year  ended  December  31,  2009  for  the 
Company’s holdings in auction rate securities described below, the Company does not believe that 
there  is  any  additional  credit  loss  associated  with  other  auction-rate  securities  because  the 
Company expects to recover the entire amortized cost basis; 

5.  The majority of the securities remain AAA rated, with $8.6 million of the auction rate securities 
having been downgraded by Moody’s to A3-Baa3 during the year ended December 31, 2009, and 
there have been no downgrades during the year ended December 31, 2010; and 

6.  All scheduled interest payments have been made pursuant to the reset terms and conditions. 

Based on the guidance of ASC 320-10-35 and ASC 320-10-50, the Company evaluated the potential credit loss of each 
of the auction-rate securities that are currently held by the Company. Based on such analysis, the Company determined 
that those securities that are not 100% FFELPS guaranteed are potentially subject to credit risks based on the extent to 
which the underlying debt is collateralized and the security-specific student-loan default rates. The Company’s portfolio 
includes three such securities, one of which has a senior parity ratio of approximately 126%, which is substantially above 
the expected student-loan default rate for that security. Conversely, the senior parity ratio for the other two securities is 
approximately  105%.  If,  therefore,  the  student-loan  default  rate  and  borrowing  rate  increases  for  these  issuers,  the 
remaining balance in these trusts may not be sufficient to cover the senior debt. The Company therefore concluded that 
there is potential credit risk for these two securities and as such, used the discounted cash flow model to determine the 

37 

 
  
  
  
 
 
   
   
   
   
   
   
  
amount of credit loss to be recorded. In valuing the potential credit loss, the following parameters  were used: 20  year 
expected term, cash flows based on the 90-day t-bill rates for 20 year forwards and a risk premium of 5.9%, the amount 
of interest that the Company was receiving on these securities when the market was last active. As of December 31, 2010 
and 2009, the potential credit loss associated with these securities was $70,000, which the Company deemed other-than-
temporary and recorded in other expense in its Consolidated Statement of Operations during 2009. 

Unless another rights offering or other similar offers are made to redeem at par and accepted by us, we intend to hold the 
balance of these investments through successful auctions at par, which we believe could take approximately 2.0 years. 

The valuation of the auction-rate securities is subject to fluctuations in the future, which will depend on many factors, 
including  the  collateral  quality,  potential  to  be  called  or  restructured,  underlying  final  maturity,  insurance  guaranty, 
liquidity and market conditions, among others. To determine the fair value of the auction-rate securities at December 31, 
2009,  March  31,  2010,  June  30,  2010,  September  30,  2010  and  December  31,  2010,  we  used  a  discounted  cash  flow 
model, for which there are three valuation parameters, including time-to-liquidity, discount rate and expected return. The 
following are the values used in the discounted cash flow model: 

Time-to-Liquidity 
Expected Return (Based on the requisite 
treasury rate, plus a contractual penalty 
rate) 
Discount Rate (Based on the requisite 
LIBOR, the cost of debt and a liquidity 
risk premium) 

December 31, 
2009 
24 months 
2.4% 

March 31, 
2010 
24 months 
2.4% 

June 30,  
2010 
24 months 
2.7% 

September 30, 
2010 
24 months 
2.2% 

December 31, 
2010 
24 months 
2.9% 

5.2% - 10.0%, 
depending on 
the credit-
rating of the 
security 

4.6% - 9.4%, 
depending on 
the credit-
rating of the 
security 

3.8% - 8.6%, 
depending on 
the credit-
rating of the 
security 

3.2% - 8.0%, 
depending on 
the credit-
rating of the 
security 

4.1% - 8.9%, 
depending on 
the credit-
rating of the 
security 

In October 2008, the Company accepted an offer to participate in an auction-rate security rights offering from UBS to 
sell up to $18.2 million in face value of eligible auction-rate securities commencing in June 2010. Between October 2008 
and June 2010, $9.6 million of these auction-rate securities were called at par. On June 30, 2010, the Company exercised 
the UBS put right and sold the remaining $8.6 million in auction rate securities at par, for which the sale was completed 
and  proceeds  were  received  on  July  1,  2010.  At  December  31,  2009,  we  had  $16.9  million  in  eligible  auction-rate 
securities remaining at UBS. The impairment related to these auction-rate securities and the corresponding put right were 
valued at $0.7 million. The change in the impairment and the fair value of the put right was recorded in accordance with 
the  provisions  of  ASC  320-10-35  and  ASC  320-10-50  in  other  income  (expense)  in  the  Consolidated  Statement  of 
Operations. 

From the end of the third quarter of 2010 to the end of the fourth quarter of 2010, we sold $0.2 million in auction-rate 
securities at par. However, the FFELPS-guaranteed student-loan credit default spread and the spread between the 90-day 
libor and t-bill forward rates increased. The net effect of the adjustments was an increase in the overall impairment from 
$0.9 million at September 30, 2010 to $1.0 million at December 31, 2010. 

From the end of the second quarter of 2010 to the end of the third quarter of 2010, we kept the time-to-liquidity constant 
at 2.0 years. There was a slight decrease in the spread between the 90-day libor and t-bill forward rates as well as a small 
decrease  in  the  FFELPS-guaranteed  student-loan  credit  default  spread.  We  also  sold  $8.8  million  in  auction-rate 
securities at par, all of which was related to the exercise of the UBS put right. The net effect of the adjustments was a 
reduction in the overall impairment from $1.3 million at June 30, 2010 to $0.9 million at September 30, 2010. 

From the end of the first quarter of 2010 to the end of the second quarter of 2010, we kept the time-to-liquidity constant 
at  2.0  years.  The  spread  between  the  90-day  libor  and  t-bill  forward  rates  remained  relatively  constant.  We  sold  $8.1 
million in auction rate securities at par, all of which were held at UBS. However, the FFELPs-guaranteed student-loan 
credit default spread increased slightly. The net effect of the adjustments was a reduction in the overall impairment from 
$1.5 million at March 31, 2010 to $1.3 million at June 30, 2010. The overall impairment decreased primarily because we 
sold a large amount of auction-rate securities back to UBS at par. This  was partially offset by a slight increase in the 
FFELPS-guaranteed student-loan credit default spread. 

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From the end of the fourth quarter of 2009 to the end of the first quarter of 2010, we kept the time-to-liquidity constant at 
2.0 years. We sold $0.2 million in auction-rate securities at par. The spread between the 90-day libor and t-bill forward 
rate decreased and the FFELPs-guaranteed student-loan credit default spread decreased. The net effect of the adjustments 
was a reduction in the overall impairment from $1.8 million at December 31, 2009 to $1.5 million at March 31, 2010. 

Net cash used in financing activities for the year ended December 31, 2010 was $14.0 million, primarily related to the 
repurchase of our common stock in the amount of $31.5 million, which  was partially offset by the exercise of options 
and proceeds from our Employee Stock Purchase Plan in the amount of $16.2 million. Net cash provided by financing 
activities  for  the  year  ended  December  31,  2009  was  $13.6  million,  primarily  from  the  exercise  of  stock  options  and 
proceeds from our Employee Stock Purchase Plan in the amount of $13.0 million. 

Net  cash  used  by  financing  activities  for  the  year  ended  December  31,  2008  was  $9.8  million,  primarily  from  the 
repurchase  of  $25.0  million  of  our  common  stock.  This  was  partially  offset  by  the  proceeds related to the exercise of 
options  and  proceeds  from  our  Employee  Stock  Purchase  Plan  of  common  stock  in  the  amount  of  $14.5  million  and 
excess tax benefits related to the exercise of options of $0.8 million. 

On July 27, 2010, we announced that our Board of Directors approved a stock repurchase program that authorizes the 
Company to repurchase up to $50.0 million of its common stock between August 2, 2010 and December 31, 2011. In 
February 2011, the Board of Directors approved an increase from $50.0 million to $70.0 million. As of December 31, 
2010, the following shares have been repurchased through the open market and subsequently retired: 

2010 Calendar Year 
August 
November 

Total Shares Repurchased 

There were no repurchases in 2009. 

Shares 

Repurchased      

983,189      $ 
916,600      $ 
1,899,789       

Average 
Price per 
Share 

Value 
(in thousands)   
16,998   
14,529   
31,527   

17.29      $ 
15.85      $ 
       $ 

Although cash requirements will fluctuate based on the timing and extent of many factors such as those discussed above, 
we believe that cash generated from operations, together with the liquidity provided by existing cash balances and short 
term  investments,  will  be  sufficient  to  satisfy  our  liquidity  requirements  for  the  next  12 months.  For  further  details 
regarding our operating, investing and financing activities, see the Consolidated Statement of Cash Flows. 

In the future, in order to strengthen our financial position, in the event of unforeseen circumstances, or in the event we 
need to fund our growth in future financial periods, we may need to raise additional funds by any one or a combination 
of the following: issuing equity securities, debt or convertible debt or the sale of certain product lines and/or portions of 
our business. There can be no guarantee that we will be able to raise additional funds on terms acceptable to us, or at all. 

From time to time, we have engaged in discussions with third parties concerning potential acquisitions of product lines, 
technologies and businesses, and we continue to consider potential acquisition candidates. Any such transactions could 
involve the issuance of a significant number of new equity securities, debt, and/or cash consideration.  We may also be 
required  to  raise  additional  funds  to  complete  any  such  acquisition,  through  either  the  issuance  of  equity  securities  or 
borrowings. If we raise additional funds or acquire businesses or technologies through the issuance of equity securities, 
our existing stockholders may experience significant dilution. 

Contractual Obligations 

We lease our headquarters and sales offices in San Jose, California. The San Jose facility was sold and the new landlord 
has exercised their right to terminate the lease, effective April 18, 2012. 

In September 2004, we signed an agreement with the Chinese local authority to construct a facility in Chengdu, China. 
Pursuant  to  this  agreement,  we  agreed  to  contribute  capital  in  the  form  of  cash,  in-kind  assets,  and/or  intellectual 
property, of at least $5.0 million to our wholly-owned Chinese subsidiary as the registered capital for the subsidiary and 
exercised the option to purchase land use rights for the facility of approximately $0.2 million. We also have the option to 
acquire  the  facility  after  a  five-year  lease  term  for  the  original  construction  cost  less  rents  paid,  which  is  currently 

39 

 
  
  
  
  
  
    
    
    
    
  
  
  
 
 
  
 
estimated at $1.9 million and which becomes exercisable in March 2011. We will likely enter into a purchase agreement 
for this facility at a date to be determined and as the opportunity necessitates. 

As  of  December  31,  2010,  our  total  outstanding  purchase  commitments  were  $14.4  million,  which  includes  wafer 
purchases  from  our  two  foundries,  the  purchase  of  assembly  services  primarily  from  multiple  contractors  in  Asia  and 
purchase commitments related to the construction of our Chengdu facility. This compares to purchase commitments of 
$13.2 million as of December 31, 2009. 

The following table summarizes our contractual obligations at December 31, 2010, and the effect such obligations are 
expected to have on our liquidity and cash flow over the next five years (in thousands). 

Operating leases 
Outstanding 
purchase 
commitments 

   Total 
  $ 

2,413      $ 

2011 

2012 

Payments by Period 
2013 

2014 

2015 

1,665      $ 

574      $ 

174      $ 

-      $ 

     Thereafter   
-   
-      $ 

  $ 

14,379      $ 

14,379      $ 

-      $ 

-      $ 

  $ 

16,792      $ 

16,044      $ 

574      $ 

174      $ 

-      $ 

-      $ 

-      $ 

-      $ 

-   

-   

Because of the uncertainty as to the timing of payments related to our liabilities for unrecognized tax benefits, we have 
excluded estimated obligations of $5.0 million, after considering the valuation allowance, from the table above. 

Off Balance Sheet Arrangements 

As of December 31, 2010, we had no off-balance sheet arrangements as defined in Item 303(a)(4) of the Securities and 
Exchange Commission’s Regulation S-K. 

ITEM 7A.            QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK 

Interest Rate Risk 

Our cash equivalents and investments are subject to market risk, primarily interest rate and credit risk. Our investments 
are managed by outside professional managers within investment guidelines set by us. Such guidelines include security 
type, credit quality and maturity and are intended to limit market risk by restricting our investments to high quality debt 
instruments with relatively short-term maturities. 

We do not use derivative financial instruments in our investment portfolio. Investments in debt securities are classified as 
available-for-sale or trading. For available-for-sale investments, no gains or losses are recognized by us in our results of 
operations due to changes in interest rates unless such securities are sold prior to maturity or are determined to be other-
than-temporarily impaired. Available-for-sale investments are reported at fair value with the related unrealized gains or 
losses  being  included  in  accumulated  other  comprehensive  income,  a  component  of  stockholders’  equity.  Trading 
securities are reported at fair value with unrealized gains and losses included in earnings. 

Fluctuations in interest rates of +/- 10% could impact our annual results of operations by approximately $0.1 million. 

Foreign Currency Exchange Risk 

Our sales outside the United States are transacted in U.S. dollars. Accordingly, our sales are not generally impacted by 
foreign currency rate changes. In 2010, the primary functional currency of the Company’s offshore operations was the 
local  currency,  primarily  the  New  Taiwan  Dollar  and  the  Chinese  Yuan.  To  date,  fluctuations  in  foreign  currency 
exchange rates  have  not had  a  material impact on our results of operations. However, fluctuations of +/- 10% in  such 
local currencies could impact our annual results of operations by approximately $4.2 million. 

Value Change to Long-Term Investments 

As of December 31, 2010, all of our holdings in auction rate securities, which have a face value of $20.2 million, have 
failed to reset as a result of current market conditions. Should these auctions continue to fail and if the credit rating for 
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these  securities  decline,  a  10%  decline  in  the  fair  value  could  impact  our  results  of  operations  by  approximately  $2.0 
million. 

In valuing the auction-rate securities using the discounted cash flow model, a change in either the liquidity risk premium 
or time-to-liquidity by 10% would result in a $0.1 million change in the value of our auction-rate securities portfolio. 

ITEM 8. 

FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA 

MONOLITHIC POWER SYSTEMS, INC. 

CONSOLIDATED FINANCIAL STATEMENTS 

Contents 

orts of Independent Registered Public Accounting Firm 
solidated Balance Sheets 
solidated Statements of Operations 
solidated Statements of Stockholders’ Equity 
solidated Statements of Cash Flows 
es to Consolidated Financial Statements 

Page 
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         40 
         41 
         42 
         43 

41 

 
 
  
  
  
  
  
   
  
 
REPORT OF INDEPENDENT REGISTERED PUBLIC ACCCOUNTING FIRM 

To the Board of Directors and Stockholders of 
Monolithic Power Systems, Inc. 

We  have  audited  the  accompanying  consolidated  balance  sheets  of  Monolithic  Power  Systems,  Inc.  and  subsidiaries 
(collectively, the “Company”) as of December 31, 2010 and 2009, and the related consolidated statements of operations, 
stockholders’ equity, and cash flows for each of the three years in the period ended December 31, 2010.  These financial 
statements  are  the  responsibility  of  the  Company’s  management.  Our  responsibility  is  to  express  an  opinion  on  the 
financial statements based on our audits. 

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United 
States).  Those  standards  require  that  we  plan  and  perform  the  audit  to  obtain  reasonable  assurance  about  whether  the 
financial statements are free of material misstatement.  An audit includes examining, on a test basis, evidence supporting 
the amounts and disclosures in the financial statements.  An audit also includes assessing the accounting principles used 
and significant estimates made by management, as well as evaluating the overall financial statement presentation.  We 
believe that our audits provide a reasonable basis for our opinion. 

In  our  opinion,  such  consolidated  financial  statements  present  fairly,  in  all  material  respects,  the  financial  position  of 
Monolithic Power Systems, Inc. and subsidiaries as of December 31, 2010 and 2009, and the results of their operations 
and their cash flows for each of the three years in the period ended December 31, 2010, in conformity with accounting 
principles generally accepted in the United States of America. 

We  have  also  audited,  in  accordance  with  the  standards  of  the  Public  Company  Accounting  Oversight  Board  (United 
States),  the  Company’s  internal  control  over  financial  reporting  as  of  December  31,  2010,  based  on  the  criteria 
established  in  Internal  Control  –  Integrated  Framework  issued  by  the  Committee  of  Sponsoring  Organizations  of  the 
Treadway Commission, and our report dated March 4, 2011 expressed an unqualified opinion on the Company’s internal 
control over financial reporting. 

/s/ Deloitte & Touche LLP 

San Jose, California 
March 4, 2011 

42 

 
 
 
 
 
 
 
 
 
  
 
REPORT OF INDEPENDENT REGISTERED PUBLIC ACCCOUNTING FIRM 

To the Board of Directors and Stockholders of 
Monolithic Power Systems, Inc. 

We  have  audited  the  internal  control  over  financial  reporting  of  Monolithic  Power  Systems,  Inc.  and  subsidiaries 
(collectively, the “Company”) as of December 31, 2010, based on the criteria established in Internal Control-Integrated 
Framework  issued  by  the  Committee  of  Sponsoring  Organizations  of  the  Treadway  Commission.  The  Company’s 
management is responsible for maintaining effective internal control over financial reporting and for its assessment of 
the effectiveness of internal control over financial reporting included in the accompanying Management’s Annual Report 
on  Internal  Control  Over  Financial  Reporting.  Our  responsibility  is  to  express  an  opinion  on  the  Company’s  internal 
control over financial reporting based on our audit. 

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United 
States).  Those  standards  require  that  we  plan  and  perform  the  audit  to  obtain  reasonable  assurance  about  whether 
effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an 
understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and 
evaluating  the  design  and  operating  effectiveness  of  internal  control  based  on  the  assessed  risk,  and  performing  such 
other procedures as we considered necessary in the circumstances.  We believe that our audit provides a reasonable basis 
for our opinion. 

A  company’s  internal  control  over  financial  reporting  is  a  process  designed  by,  or  under  the  supervision  of,  the 
company’s principal executive and principal financial officers, or persons performing similar functions, and effected by 
the  company’s  board  of  directors,  management  and  other  personnel  to  provide  reasonable  assurance  regarding  the 
reliability  of  financial  reporting  and  the  preparation  of  financial  statements  for  external  purposes  in  accordance  with 
generally accepted accounting principles.  A company’s internal control over financial reporting includes those policies 
and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the 
transactions  and  dispositions  of  the  assets  of  the  company;  (2)  provide  reasonable  assurance  that  transactions  are 
recorded  as  necessary  to  permit  preparation  of  financial  statements  in  accordance  with  generally  accepted  accounting 
principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of 
management  and  directors  of  the  company;  and  (3)  provide  reasonable  assurance  regarding  prevention  or  timely 
detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the 
financial statements. 

Because of the inherent limitations of internal control over financial reporting, including the possibility of collusion or 
improper  management  override  of  controls,  material  misstatements  due  to  error  or  fraud  may  not  be  prevented  or 
detected on a timely basis.  Also, projections of any evaluation of the effectiveness of the internal control over financial 
reporting  to  future  periods  are  subject  to  the  risk  that  the  controls  may  become  inadequate  because  of  changes  in 
conditions, or that the degree of compliance with the policies or procedures may deteriorate. 

In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of 
December 31, 2010, based on the criteria established in Internal Control-Integrated Framework issued by the Committee 
of Sponsoring Organizations of the Treadway Commission. 

We  have  also  audited,  in  accordance  with  the  standards  of  the  Public  Company  Accounting  Oversight  Board  (United 
States), the consolidated financial statements as of and for the year ended December 31, 2010, of the Company and our 
report dated March 4, 2011 expressed an unqualified opinion on those consolidated financial statements. 

/s/ Deloitte & Touche LLP 

San Jose, California 
March 4, 2011 

43 

 
 
  
 
 
 
 
 
 
 
  
MONOLITHIC POWER SYSTEMS, INC. 

CONSOLIDATED BALANCE SHEETS 
(in thousands, except share amounts) 

ASSETS 
Current assets: 

Cash and cash equivalents 
Short-term investments 
Accounts receivable, net of allowances of $0 in both 2010 and 2009 
Inventories 
Deferred income tax assets, net - current 
Prepaid expenses and other current assets 

Total current assets 

Property and equipment, net 
Long-term investments 
Deferred income tax assets, net - long-term 
Other assets 

Total assets 

LIABILITIES AND STOCKHOLDERS’ EQUITY 
Current liabilities: 

Accounts payable 
Accrued compensation and related benefits 
Accrued liabilities 

Total current liabilities 

Non-current income tax liability 
Other long-term liabilities 
      Total liabilities 
Stockholders' equity: 

  $ 

  $ 

  $ 

December 31, 

2010 

2009 

48,010     $ 
129,709       
18,347       
25,789       
204       
2,314       
224,373       
37,262       
19,180       
39       
749       
281,603     $ 

8,979     $ 
8,792       
11,199       
28,970       

5,015       
723       
34,708       

46,717   
118,914   
15,521   
19,616   
5   
2,726   
203,499   
17,968   
19,445   
175   
734   
241,821   

7,787   
8,454   
7,681   
23,922   

4,915   
27   
28,864   

Common stock, $0.001 par value, $35 and $35 in 2010 and 2009, respectively; 
shares authorized: 150,000,000; shares issued and outstanding: 35,063,033 
and 35,165,316 in 2010 and 2009, respectively 
Retained earnings 
Accumulated other comprehensive income 

Total stockholders’ equity 
Total liabilities and stockholders’ equity 

178,269       
66,647       
1,979       
246,895       
281,603     $ 

175,518   
37,085   
354   
212,957   
241,821   

  $ 

See accompanying notes to consolidated financial statements. 

44 

 
  
 
   
  
  
   
  
    
  
    
      
  
    
      
  
    
    
    
    
    
    
    
    
    
    
   
    
        
    
    
        
    
    
        
    
    
    
    
   
    
        
    
    
    
    
    
        
    
    
    
    
    
  
  
  
MONOLITHIC POWER SYSTEMS, INC. 

CONSOLIDATED STATEMENTS OF OPERATIONS 
(in thousands, except per share amounts) 

Revenue 
Cost of revenue 
Gross profit 
Operating expenses: 

Research and development 
Selling, general and administrative 
Litigation expense 
Litigation provision reversal, net 
Total operating expenses 

Income from operations 
Other income (expense): 

Interest and other income 
Other expense 
Total other income, net 

Income before income taxes 
Income tax provision 
Net income 

Basic income per share 
Diluted income per share 

Year Ended December 31, 
2009 

2008 

2010 

  $ 

218,840      $ 
97,383        
121,457        

165,008      $ 
67,330        
97,678        

160,511   
61,184   
99,327   

44,372        
41,169        
5,418        
-        
90,959        

38,295        
36,752        
9,457        
(6,356 )      
78,148        

34,850   
35,256   
6,714   
-   
76,820   

30,498        

19,530        

22,507   

1,156        
(234 )      
922        

31,420        
1,857        
29,563      $ 

1,047        
(429 )      
618        

20,148        
474        
19,674      $ 

0.83      $ 
0.78      $ 

0.57      $ 
0.54      $ 

  $ 

  $ 
  $ 

3,587   
(652 ) 
2,935   

25,442   
1,216   
24,226   

0.72   
0.67   

33,509   
2,611   
36,120   

Weighted-average common shares outstanding 
Stock options and restricted stock 
Diluted weighted-average common equivalent shares outstanding 

35,830        
1,996        
37,826        

34,310        
2,324        
36,634        

See accompanying notes to consolidated financial statements. 

45 

 
 
  
   
  
  
   
  
    
    
  
   
    
      
      
  
    
    
    
        
        
    
    
    
    
    
    
   
    
        
        
    
    
    
        
        
    
    
    
    
   
    
        
        
    
    
    
   
    
        
        
    
   
    
        
        
    
    
    
    
  
  
  
MONOLITHIC POWER SYSTEMS, INC. 

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY 
 (in thousands, except share amounts) 

   Common Stock 
   Shares 

Deferred  
Stock 
    Amount     Compensation      Deficit) 

Retained 
Earnings  
(Accumulated     

Accumulated 
Other  
Comprehensive     
    Income (Loss)      Equity 

Total  
Stockholders’   

Balance as of December 31, 2007 
Components of comprehensive loss: 
   Net income 
   Impairment of Auction Rate Securities 
   Unrealized gains 
   Foreign exchange gain 
Total comprehensive income 
Exercise of stock options, including net excess tax benefit 
of $765 
Repurchase of common shares 
Shares purchased through ESPP 
Stock-based compensation expense, net of forfeitures 
Compensation expense for non-employee stock options 
Release of restricted stock upon vesting 
Balance as of December 31, 2008 
Components of comprehensive income: 
   Net income 
   Impairment of Auction Rate Securities 
   Unrealized losses 
   Foreign exchange gain 
Total comprehensive income 
Exercise of stock options, including net excess tax benefit 
of $643 
Shares purchased through ESPP 
Stock-based compensation expense, net of forfeitures 
Compensation expense for non-employee stock options 
Release of restricted stock upon vesting 
Balance as of December 31, 2009 
Components of comprehensive income: 
   Net income 
   Impairment of Auction Rate Securities 
   Unrealized losses 
   Foreign exchange gain 
Total comprehensive income 
Exercise of stock options, including net excess tax benefit 
of $1,256 
Repurchase of common shares 
Shares purchased through ESPP 
Stock-based compensation expense, net of forfeitures 
Compensation expense for non-employee stock options 
Release of restricted stock upon vesting 
Balance as of December 31, 2010 

    33,454,595     $ 143,890     $ 

(3 )   $ 

(6,815 )   $ 

465     $ 

137,537   

24,226       

(1,400 )     
(1 )     
872       

3       

-     $ 

17,411     $ 

(64 )   $ 

19,674       

340       
(109 )     
187       

-     $ 

37,085     $ 

354     $ 

29,563       

160       
104       
1,361       

-     $ 

66,647     $ 

1,979     $ 

24,226   
(1,400 ) 
(1 ) 
872   
23,697   

13,480   
(25,043 ) 
1,778   
13,154   
42   
-   
164,645   

19,674   
340   
(109 ) 
187   
20,092   

11,824   
1,794   
14,484   
118   
-   
212,957   

29,563   
160   
104   
1,361   
31,188   

15,597   
(31,527 ) 
1,885   
16,803   
(7 ) 
-   
246,895   

     1,417,585        13,480       
    (1,430,105 )      (25,043 )     
1,778       
     125,207       
         13,151       
42       
-       
    33,646,821     $ 147,298     $ 

79,539       

     1,217,272        11,824       
1,794       
     161,026       
         14,484       
118       
     140,197       
-       
    35,165,316     $ 175,518     $ 

     1,452,245        15,597       
    (1,899,789 )      (31,527 )     
1,885       
     114,387       
         16,803       
(7 )     
     230,874       
-       
    35,063,033     $ 178,269     $ 

See accompanying notes to consolidated financial statements 

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MONOLITHIC POWER SYSTEMS, INC. 

CONSOLIDATED STATEMENTS OF CASH FLOWS 
(in thousands) 

Cash flows from operating activities: 
Net income 
Adjustments to reconcile net income to net cash provided by operating 
activities: 

Depreciation and amortization 
Loss on disposal of property and equipment 
Amortization and realized gain (loss) on debt instruments 
Deferred income tax assets 
Credit loss on auction-rate securities 
Tax benefit from stock option transactions 
Excess tax benefit from stock option transactions 
Stock-based compensation 
Changes in operating assets and liabilities: 

Accounts receivable 
Inventories 
Prepaid expenses and other assets 
Accounts payable 
Accrued and long-term liabilities 
Accrued income taxes payable and noncurrent tax liabilities 
Accrued compensation and related benefits 
Net cash provided by operating activities 

Cash flows from investing activities: 
Property and equipment purchases 
Purchase of intangible assets 
Purchase of short-term investments 
Proceeds from sale of short-term investments 
Proceeds from sale of long-term investments 
Changes in restricted assets 

Net cash used in investing activities 

Cash flows from financing activities: 

Proceeds from issuance of common stock 
Proceeds from employee stock purchase plan 
Repurchase of common stock 
Excess tax benefits from stock option transactions 

Net cash provided by (used in) financing activities 

Effect of change in exchange rates 
Net increase (decrease) in cash and cash equivalents 
Cash and cash equivalents, beginning of period 
Cash and cash equivalents, end of period 

Supplemental disclosures for cash flow information: 

Cash paid (received) for taxes 

Supplemental disclosures of non-cash investing and financing activities: 

Liability accrued for equipment purchases 
Unrealized loss on auction-rate securities 
Temporary impairment of auction-rate securities 
Other-than-temporary impairment of short-term investments 
Value of auction-rate security put right 

Year Ended December 31, 
2009 

2008 

2010 

  $ 

29,563     $ 

19,674     $ 

24,226   

8,016       
1       
688       
(56 )     
-       
3,349       
(1,256 )     
16,810       

(2,826 )     
(6,184 )     
378       
1,155       
556       
(1,995 )     
295       
48,494       

(22,779 )     
-       
(208,621 )     
197,243       
425       
(19 )     
(33,751 )     

14,339       
1,885       
(31,527 )     
1,256       
(14,047 )     

597       
1,293       
46,717       
48,010     $ 

6,573       
17       
380       
(84 )     
70       
2,288       
(643 )     
14,611       

(6,406 )     
(737 )     
(101 )     
2,699       
(5,633 )     
(1,492 )     
548       
31,764       

(9,954 )     
(310 )     
(159,917 )     
80,586       
100       
7,367       
(82,128 )     

11,181       
1,794       
-       
643       
13,618       

197       
(36,549 )     
83,266       
46,717     $ 

5,725   
5   
(36 ) 
710   
-   
2,110   
(765 ) 
13,158   

(876 ) 
(1,356 ) 
2,242   
(1,382 ) 
(1,816 ) 
(1,897 ) 
(458 ) 
39,590   

(5,233 ) 
-   
(36,608 ) 
30,985   
725   
8,566   
(29,615 ) 

12,715   
1,778   
(25,043 ) 
765   
(9,785 ) 

(38 ) 
152   
83,114   
83,266   

35     $ 

321     $ 

(2,482 ) 

4,264     $ 
(104 )   $ 
(160 )   $ 
-     $ 
-     $ 

663     $ 
(340 )   $ 
70     $ 
525     $ 
(525 )   $ 

228   
1,400   
(1,250 ) 
-   
1,250   

  $ 

  $ 

  $ 
  $ 
  $ 
  $ 
  $ 

See accompanying notes to consolidated financial statements 

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MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

1.  Summary of Significant Accounting Policies 

Business  —  Monolithic  Power  Systems,  Inc.  (MPS  or  the  Company)  was  incorporated  in  the  State  of  California  on 
August  22,  1997.  On  November  17,  2004,  the  Company  was  reincorporated  in  the  State  of  Delaware.  MPS  designs, 
develops and markets proprietary, advanced analog and mixed-signal semiconductors. The Company combines advanced 
process  technology  with  its  highly  experienced  analog  designers  to  produce  high-performance  power  management 
integrated  circuits  (ICs)  for  DC  to  DC  converters,  LED  drivers,  Cold  Cathode  Fluorescent  Lamp  (CCFL)  backlight 
controllers,  Class-D  audio  amplifiers,  and  other  Linear  ICs.  MPS  products  are  used  extensively  in  computing  and 
network  communications  products,  LCD  monitors  and  TVs,  and  a  wide  variety  of  consumer  and  portable  electronics 
products.  MPS  partners  with  world-class  manufacturing  organizations  to  deliver  top  quality,  ultra-compact,  high-
performance solutions through productive, cost-efficient channels. 

Basis of Presentation — The consolidated financial statements include the accounts of Monolithic Power Systems, Inc. 
and  its  wholly  owned  subsidiaries.  All  significant  intercompany  accounts  and  transactions  have  been  eliminated  in 
consolidation. 

Foreign  Currency Transactions  — The Company’s  foreign subsidiaries operate primarily  using their respective local 
currencies,  and  therefore,  the  local  currency  has  been  determined  to  be  the  functional  currency  for  each  foreign 
subsidiary.  Accordingly,  all  assets  and  liabilities  of  the  Company’s  foreign  subsidiaries  are  translated  using  exchange 
rates in effect at the end of the period. Revenue and costs are translated using average exchange rates for the period. The 
resulting  translation  adjustments  are  presented  as  a  separate  component  of  accumulated  other  comprehensive  income 
(loss) in stockholders’ equity. 

Use of Estimates — The preparation of financial statements in conformity with accounting principles generally accepted 
in  the  United  States  of  America  requires  management  to  make  estimates  and  assumptions  that  affect  the  reported 
amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements 
and  reported  amounts  of  revenue  and  expenses  during  the  reporting  period.  Actual  results  could  differ  from  those 
estimates. 

 Certain  Significant  Risks  and  Uncertainties  —  Financial  instruments  which  potentially  subject  the  Company  to 
concentrations of credit risk  consist primarily of cash and cash equivalents, short-term  and long-term investments and 
accounts receivable. The Company’s cash consists of checking and savings accounts. The Company’s cash equivalents 
include  short-term,  highly  liquid  investments  purchased  with  remaining  maturities  at  the  date  of  purchase  of  three 
months or less. The Company’s short-term investments consist primarily of government agencies and treasuries and the 
Company’s  long-term  investments  consist  of  government-backed  student  loan  auction-rate  securities.  The  Company 
generally does not require its customers to provide collateral or other security to support accounts receivable. To manage 
credit risk, management performs ongoing credit evaluations of its customers’ financial condition. 

The Company participates in  the dynamic high technology industry and believes that changes in any of the  following 
areas  could  have  a  material  adverse  effect  on  the  Company’s  future  financial  position,  results  of  operations  or  cash 
flows:  advances  and  trends  in  new  technologies  and  industry  standards;  competitive  pressures  in  the  form  of  new 
products or price reductions  on current products; changes  in product  mix; changes in the overall demand for products 
offered  by  the  Company;  changes  in  third-party  manufacturers;  changes  in  key  suppliers;  changes  in  certain  strategic 
relationships or customer relationships; litigation or claims against the Company based on intellectual property, patent, 
product,  regulatory  or  other  factors;  fluctuations  in  foreign  currency  exchange  rates;  risk  associated  with  changes  in 
domestic and international economic and/or political regulations; availability of necessary components or subassemblies; 
availability  of  foundry  capacity;  and  the  Company’s  ability  to  attract  and  retain  employees  necessary  to  support  its 
growth. 

48 

 
  
  
  
  
  
  
  
  
  
  
MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued) 

 Fair Value of Financial Instruments — ASC 820-10 Fair Value Measurements and Disclosures – Overall defines fair 
value, establishes a framework for measuring fair value in generally accepted accounting principles in the United States 
of  America,  and  requires  that  assets  and  liabilities  carried  at  fair  value  be  classified  and  disclosed  in  one  of  the  three 
categories, as follows: 

• 

• 

• 

Level 1: Quoted prices in active markets for identical assets; 

Level 2: Valuations based on observable inputs other than Level 1 prices such as quoted prices for similar 
assets or liabilities or quoted prices in markets that are not active; and  

Level 3: Significant unobservable inputs. 

ASC 820-10-35-51 Fair Value Measurement and Disclosure – Overall – Subsequent Measurement – Determining Fair 
Value  When  the  Volume  and  Level  of  Activity  for  the  Asset  or  Liability  Have  Significantly  Decreased  and  Identifying 
Transactions That Are Not Orderly provides additional guidance for estimating fair value in accordance with ASC 820-
10 Fair Value Measurements and Disclosures – Overall, when the volume and level of activity for the asset or liability 
have significantly decreased. 

The Company’s  financial instruments include cash and cash equivalents and short-term and long-term investments. Cash 
equivalents are stated at cost, which approximates fair market value based on quoted market prices. Short-term and long-
term investments are stated at their fair market value. 

At  December  31,  2010,  the  face  value  of  the  Company’s  holdings  in  auction  rate  securities  was  $20.2  million,  all  of 
which  was  classified  as  long-term  available-for-sale  investments.  Investments  in  available-for-sale  securities  are 
recorded  at  fair  value,  and  unrealized  gains  or  losses  (that  are  deemed  to  be  temporary)  are  recognized  through 
shareholders' equity, as a component of accumulated other comprehensive income in our consolidated balance sheet. The 
Company records an impairment charge to earnings when an available-for-sale investment has experienced a decline in 
value  that  is  deemed  to  be  other-than-temporary.  Investments  in  trading  securities  are  recorded  at  fair  value  and 
unrealized  gains  and  losses  are  recognized  in  other  income  (expense)  in  the  Company’s  consolidated  statement  of 
operations. 

The  Company  adopted  the  provisions  of  ASC  320-10-35  Investments  –  Debt  and  Equity  Securities  –  Overall  – 
Subsequent Measurement and ASC 320-10-50 Investments – Debt and Equity Securities – Overall - Disclosure, effective 
April 1, 2009 and used the guidelines therein to determine whether the impairment is temporary or other-than temporary. 
Other-than-temporary impairment charges exist when the entity has the intent to sell the security or it will more likely 
than  not  be  required  to  sell  the  security  before  anticipated  recovery.  During  the  year  ended  December  31,  2009,  the 
Company recognized a credit loss of $70,000, which was deemed to be other-than-temporary in other income (expense) 
in our Consolidated Statement of Operations. There were no such losses recognized in 2010 and 2008. 

Based on certain assumptions described in Note 2, the Company recorded impairment charges on its holdings in auction-
rate  securities.  The  valuation  of  these  securities  is  subject  to  fluctuations  in  the  future,  which  will  depend  on  many 
factors,  including  the  collateral  quality,  potential  to  be  called  or  restructured,  underlying  final  maturity,  insurance 
guaranty, liquidity and market conditions, among others. 

Inventories — Inventories are stated at the lower of the standard cost (which approximates actual cost on a first-in, first-
out basis) or current estimated market value.  The Company monitors manufacturing variances and revises standard costs 
if  necessary.  Due  to  continued  demand  changes,  potential  obsolescence,  and  product  life  cycle,  the  Company  writes 
down inventory to net realizable values, as needed. 

Property and Equipment — Property and equipment are stated at cost. Depreciation is computed using the straight-line 
method over the estimated useful lives of the assets, generally three to five years. Leasehold improvements are amortized 
over the shorter of the estimated useful life or the lease period. The Chengdu building, which was placed in service in 
October 2010, has a depreciation life of 30 years. 

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MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued) 

Long-Lived  Assets  —  The  Company  evaluates  long-lived  assets  for  impairment  whenever  events  or  changes  in 
circumstances  indicate  that  the  carrying  amount  of  an  asset  may  not  be  recoverable.  An  impairment  loss  would  be 
recognized when the sum of the undiscounted future net cash flows expected to result from the use of the asset and its 
eventual disposition is less than its carrying amount. Such impairment loss would be measured as the difference between 
the carrying amount of the asset and its fair value based on the present value of estimated future cash flows. 

Other Assets — Other assets consist primarily of intangible assets for the land use rights in Chengdu, purchased patents 
and long-term lease deposits. 

Revenue Recognition — The Company recognizes revenue in accordance with ASC 605-10-S25 Revenue Recognition – 
Overall – Recognition. ASC 605-10-S25 requires that four basic criteria must be met before revenue can be recognized: 
(1) persuasive evidence of an arrangement exists; (2) delivery has occurred or services have been rendered; (3) the fee is 
fixed and determinable; and (4) collectibility is reasonably assured. Determination of criteria (3) and (4) are based on 
management’s  judgment  regarding  the  fixed  nature  of  the  fee  charged  for  products  delivered  and  the  collectibility  of 
those fees. The application of these criteria has resulted in the Company generally recognizing revenue upon shipment 
(when title passes) to customers. Should changes in conditions cause management to determine these criteria are not met 
for certain future transactions, revenue recognized for any reporting period could be adversely impacted. 

Approximately  85%  of  the  Company’s  distributor  sales,  including  sales  to  the  Company’s  value-added  resellers,  are 
made through distribution arrangements with third parties. These arrangements do not include any special payment terms 
(our normal payment terms are 30-45 days for our distributors, with value-added resellers having payment terms up to 90 
days), price protection or exchange rights. Returns are limited to the Company’s standard product warranty. Certain of 
the Company’s large distributors have contracts that include limited stock rotation rights that permit the return of a small 
percentage of the previous six months’ purchases in return for a compensating new order of equal or greater dollar value. 

The Company maintains a sales reserve for stock rotation rights, which is based on historical experience of actual stock 
rotation  returns  on  a  per  distributor  basis,  where  available,  and  information  related  to  products  in  the  distribution 
channel. This reserve is recorded at the time of sale. In the future, if the Company is unable to estimate its stock rotation 
returns  accurately,  the  Company  may  not  be  able  to  recognize  revenue  from  sales  to  its  distributors  based  on  when  it 
sells inventory to its distributors. Instead, the Company may have to recognize revenue when the distributor sells through 
such inventory to an end-customer. 

The Company generally recognizes revenue upon shipment of products to the distributor for the following reasons (based 
on ASC 605-15-25-1 Revenue Recognition – Products – Recognition – Sales of Products When Right of Return Exists): 

(1)  The  Company’s  price  is  fixed  and  determinable  at  the  date  of  sale.  The  Company  does  not  offer  special 
payment terms, price protection or price adjustments to distributors where the Company recognizes revenue 
upon shipment 

(2)  The Company’s distributors are obligated to pay the Company and this obligation is not contingent on the 

resale of the Company’s products 

(3)  The  distributor’s  obligation  is  unchanged  in  the  event  of  theft  or  physical  destruction  or  damage  to  the 

products 

(4)  The Company’s distributors have stand-alone economic substance apart from the Company’s relationship 
(5)  The Company does not have any obligations for future performance to directly bring about the resale of the 

Company’s products by the distributor 

(6)  The  amount  of  future  returns  can  be  reasonably  estimated.  The  Company  has  the  ability  and  the 
information  necessary  to  track  inventory  sold  to  and  held  at  its  distributors.  The  Company  maintains  a 
history of returns and has the ability to estimate the stock rotation returns on a quarterly basis. 

If  the  Company  enters  into  arrangements  that  have  rights  of  return  that  are  not  estimable,  the  Company  recognizes 
revenue under such arrangements only after the distributor has sold the Company’s products to an end customer. 

Approximately  15%  of  the  Company’s  distributor  sales  are  made  through  small  distributors  based  on  purchase  orders 
rather than formal distribution arrangements.  These distributors do not receive any stock rotation rights. 

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MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued) 

The  terms  in  a  majority  of  the  Company’s  distribution  agreements  include  the  non-exclusive  right  to  sell,  and  the 
agreement to use best efforts to promote and develop a market for, our products in certain regions of the world and the 
ability to terminate the distribution agreement by either party with up to three months notice. The Company provides a 
one  year  warranty  against  defects  in  materials  and  workmanship.  Under  this  warranty,  the  Company  will  repair  the 
goods, provide replacements at no charge, or, under certain circumstances, provide a refund to the customer for defective 
products. Estimated warranty returns and warranty costs are based on historical experience and are recorded at the time 
product revenue is recognized. 

In  2006,  the  Company  signed  a  distribution  agreement  with  a  U.S.  distributor.  Revenue  from  this  distributor  is 
recognized  upon  sale  by  the  distributor  to  the  end  customer  because  the  distributor  has  certain  rights  of  return  which 
management believes are not estimable. For the years ended December 31, 2010 and 2009, the deferred revenue balance 
from this distributor was $1.0 million and $0.9 million, respectively. 

Stock-Based Compensation — The Company accounts for stock-based compensation in accordance with the provisions 
of  ASC  718-10-30  Compensation  –  Stock  Compensation  –  Overall  –  Initial  Measurement,  under  the  modified 
prospective  method.  ASC  718-10-30  eliminated  the  alternative  of  applying  the  intrinsic  value  measurement  to  stock 
compensation awards issued to employees. Rather, the standard requires the Company to measure the cost of employee 
services received in exchange for an award of equity instruments based on the grant-date fair value of the award. That 
cost  will be recognized over  the period during  which an employee is required to provide services in exchange  for the 
award, known as the requisite service period (usually the vesting period). The Company currently use the Black-Scholes 
option-pricing model to estimate the fair value of its share-based payments. The Black-Scholes option-pricing model is 
based  on  a  number  of  assumptions,  including  historical  volatility,  expected  life,  risk-free  interest  rate  and  expected 
dividends. 

Research and Development — Costs incurred in research and development are charged to operations as incurred. 

Income Taxes — ASC 740-10 Income Taxes – Overall prescribes a recognition threshold and measurement attribute for 
the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. This 
interpretation  also  provides  guidance  on  derecognition,  classification,  interest  and  penalties,  accounting  in  interim 
periods and disclosure. In accordance with ASC 740-10, the Company recognizes federal, state and foreign current tax 
liabilities or assets based on its estimate of taxes payable or refundable in the current fiscal year by tax jurisdiction. The 
Company also recognizes federal, state and foreign deferred tax assets or liabilities for its estimate of future tax effects 
attributable  to  temporary  differences  and  carryforwards.  The  Company  records  a  valuation  allowance  to  reduce  any 
deferred tax assets by the amount of any tax benefits that, based on available evidence and judgment, are not expected to 
be realized. 

The Company’s calculation of current and deferred tax assets and liabilities is based on certain estimates and judgments 
and involves dealing with uncertainties in the application of complex tax laws. The Company’s estimates of current and 
deferred tax assets and liabilities may change based, in part, on added certainty or finality or uncertainty to an anticipated 
outcome, changes in accounting or tax laws in the U.S., or foreign jurisdictions where we operate, or changes in other 
facts  or  circumstances.  In  addition,  the  Company  recognizes  liabilities  for  potential  U.S.  and  foreign  income  tax  for 
uncertain  income  tax  positions  taken  on  its  tax  returns  if  it  has  less  than  a  50%  likelihood  of  being  sustained.  If  the 
Company  determines  that  payment  of  these  amounts  is  unnecessary  or  if  the  recorded  tax  liability  is  less  than  the 
Company’s current assessment, the Company may be required to recognize an income tax benefit or additional income 
tax  expense  in  its  financial  statements  in  the  period  such  determination  is  made.  The  Company  has  calculated  its 
uncertain tax positions which were attributable to certain estimates and judgments primarily related to transfer pricing, 
cost sharing and the Company’s international tax structure exposure. 

As of December 31, 2010, 2009 and 2008, the Company had a valuation allowance of $16.8 million, $14.6 million and 
$14.4 million, respectively, attributable to management’s determination that none of the US deferred tax assets will be 
realized, except for certain deferred tax assets related to uncertain income tax positions. As a result of the cost sharing 
arrangements  with the Company’s international subsidiaries (cost share arrangements), relatively small changes in costs 
that are not subject to sharing under the cost share arrangements can significantly impact the overall profitability of the 
US entity.  Historically, the US operations have shown an inconsistent earnings pattern due to litigation costs not subject  

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MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued) 

to  cost  sharing.  The  Company  evaluated  its  US  valuation  allowance  at  December  31,  2010  by  reviewing  both  its 
earnings  history  and  its  expected  earnings  for  the  next  12  months  in  its  US  entity.  Because  of  the  US  entity’s 
inconsistent earnings history and uncertainty of future earnings, the Company has determined that it is more likely than 
not  that  the  US  deferred  tax  benefits  would  not  be  realized.  The  Company  has  settled  most  of  its  legacy  litigation 
matters that resulted in litigation cost that were not subject to cost share in the past.  As a result, during the Company’s 
next fiscal year, a relatively small number of design wins in the US, and the absence of new litigation that may be not 
subject to cost share  may position the US entity  for a stable earnings pattern.  As such, the Company  will continue to 
evaluate if its facts and circumstances warrant a reversal of the valuation allowance against the US deferred tax benefits 
during fiscal year 2011. 

The Company incurred significant stock-based compensation expense, some of which related to incentive stock options 
for  which  no  corresponding  tax  benefit  is  recognized  unless  a  disqualifying  disposition  occurs.  Disqualifying 
dispositions  result  in  a  reduction  of  income  tax  expense  in  the  period  when  the  disqualifying  disposition  occurs  in  an 
amount equal to  the tax benefit relating  to previously recognized stock compensation expense. Tax benefits related to 
realized  tax  deductions  in  excess  of  previously  expensed  stock  compensation  are  recorded  as  an  addition  to  paid-in-
capital. 

Patent Litigation — Costs incurred in registering and defending the Company’s patents and other proprietary rights are 
charged to operations as incurred (See Note 10). 

Comprehensive Income (Loss) — Comprehensive income represents the change in the Company’s net assets during the 
period  from  non-owner  sources.  Comprehensive  income  (loss)  includes  unrealized  gains/(losses)  on  investments  and 
foreign exchange gains/(losses) for the years ended December 31, 2010, 2009 and 2008. 

Net income 
Other comprehensive income (loss): 

Years Ended December 31, 
2009 

2008 

2010 

  $ 

29,563     $ 

19,674     $ 

24,226   

Change in value of temporary impairment of auction-rate 

securities 

Unrealized gain (loss) on available-for-sale securities 
Foreign currency translation adjustments 

Comprehensive income 

  $ 

160       
104       
1,361       
31,188     $ 

340       
(109 )     
187       
20,092     $ 

(1,400 ) 
(1 ) 
872   
23,697   

Accumulated other comprehensive income presented in the Consolidated Balance Sheet at December 31, 2010 consisted 
primarily of approximately $2.8 million related to translation gains, offset by $0.9 million related to the impairment of 
the  Company’s  holdings  in  auction-rate  securities.  Accumulated  other  comprehensive  income  presented  in  the 
Consolidated Balance Sheet at December 31, 2009 consisted primarily of $1.5 million related to translation gains, offset 
by $1.1 million related to the impairment of the Company’s holdings in auction-rate securities. 

New  Accounting  Standards  —  In  October  2009,  the  Financial  Accounting  Standards  Board  (“FASB”) issued 
Accounting Standards Update ("ASU") No. 2009-13, "Multiple-Deliverable Revenue Arrangements" ("ASU 2009-13"). 
The  new  standard  changes  the  requirements  for  establishing  separate  units  of  accounting  in  a  multiple  element 
arrangement  and  requires  the  allocation  of  arrangement  consideration  to  each  deliverable  to  be  based  on  the  relative 
selling price. ASU 2009-13 is effective for fiscal years beginning on or after June 15, 2010. The Company is currently 
evaluating ASU 2009-13 and the impact, if any, that it may have on its results of operations or financial position. 

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MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued) 

2.  Fair Value Measurements 

The following is a schedule of the Company’s cash and cash equivalents and short-term and long-term investments as of 
December 31, 2010 and 2009 (in thousands): 

Cash, Cash Equivalents and Investments 

Cash in Banks 
Government Agencies / Treasuries 
Commercial Paper / Corporate Notes 
Auction-Rate Securities backed by Student-Loan Notes 
Put Right 

Total Cash, Cash Equivalents and Investments 

Reported as: 

Cash and Cash Equivalents 
Short-term Available-for-Sale Investments 
Short-term Trading Investments 
Long-term Available-for-Sale Investments 
Total Cash, Cash Equivalents and Investments 

Adjusted Cost and Estimated 
Fair Market Value as of 
December 31, 

2010 

2009 

  $ 

  $ 

  $ 

  $ 

48,010      $ 
117,302        
12,407        
19,180        
-        
196,899      $ 

48,010      $ 
129,709        
-        
19,180        
196,899      $ 

44,717   
104,064   
-   
35,570   
725   
185,076   

46,717   
102,064   
16,850   
19,445   
185,076   

The  contractual  maturities  of  the  Company’s  investments  classified  as  available-for-sale  or  trading  securities  as  of 
December 31, 2010 and 2009 is as follows (in thousands): 

Less than 1 year 
1 - 5 years 
Greater than 5 years 

2010 

2009 

  $ 

  $ 

100,637     $ 
29,072       
19,180       
148,889     $ 

73,566   
20,053   
44,740   
138,359   

The  Company  follows  the  provisions  of  ASC  820-10  Fair  Value  Measurements  and  Disclosures  –  Overall,  which 
defines fair  value, establishes a framework  for  measuring  fair value in generally accepted accounting principles in the 
United States of America, and requires that assets and liabilities carried at fair value be classified and disclosed in one of 
the  three  categories  noted  in  the  table  below.  The  Company  also  adopted  the  provisions  of  ASC  820-10-35-51  Fair 
Value Measurement and Disclosure – Overall – Subsequent Measurement – Determining Fair Value When the Volume 
and Level of Activity for the Asset or Liability Have Significantly Decreased and Identifying Transactions That Are Not 
Orderly, effective April 1, 2009, which provides additional guidance for estimating fair value in accordance with ASC 
820-10  Fair  Value  Measurements  and  Disclosures  –  Overall,  when  the  volume  and  level  of  activity  for  the  asset  or 
liability have significantly decreased. Effective January 1, 2010, the Company adopted the provisions of ASU 2010-06, 
“Disclosures  About  Fair  Value  Measurements”,  which  adds  new  requirements  for  disclosures  about  transfers  into  and 
out  of  Levels  1  and  2  and  separate  disclosures  about  purchases,  sales,  issuances,  and  settlements  relating  to  Level  3 
measurements. 

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MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued) 

The  following  tables  detail  the  fair  value  measurements  as  of  December  31,  2010  and  2009  within  the  fair  value 
hierarchy of the financial assets that are required to be recorded at fair value (in thousands): 

Fair Value Measurements at December 31, 2010 Using 

Quoted Prices 
in Active 
Markets for 
Identical 
Assets 
Level 1 

Significant 
Other 
Observable 
Inputs 
Level 2 

Significant 
Unobservable 
Inputs 
Level 3 

Total 

  $ 

  $ 

117,302      $ 
12,407        

117,302      $ 
-        

19,180        
148,889      $ 

-        
117,302      $ 

-      $ 
12,407        

-        
12,407      $ 

-   
-   

19,180   
19,180   

Fair Value Measurements at December 31, 2009 Using 

Quoted Prices 
in Active 
Markets for 
Identical 
Assets 
Level 1 

Significant 
Other 
Observable 
Inputs 
Level 2 

Significant 
Unobservable 
Inputs 
Level 3 

Total 

  $ 

104,064      $ 

104,064      $ 

19,445        
16,125        
725        
140,359      $ 

-        
-        
-        
104,064      $ 

  $ 

-      $ 

-        
-        
-        
-      $ 

-   

19,445   
16,125   
725   
36,295   

US Treasury and US Government Agency 
Bonds 
Commercial Paper / Corporates 
Long-term available-for-sale auction-rate 
securities 

US Treasury and US Government Agency 
Bonds 
Long-term available-for-sale auction-rate 
securities 
Short-term trading auction-rate securities 
Put right 

At December 31, 2010, fixed income available-for-sales securities included $117.3 million in US government agencies 
and  treasuries  and  $12.4  million  in  corporate  notes  and  commercial  paper,  all  of  which  are  classified  as  short-term 
investments. From these investments, there was $18,000 in unrealized losses. The impact of gross unrealized gains and 
losses  was  not  material.  At  December  31,  2010,  the  Company  also  had  $20.2  million  in  face  value  of  auction-rate 
securities,  all  of  which  are  classified  as  long-term  available-for-sale  investments  and  $15.6  million  in  money  market 
funds. 

At December 31, 2009, fixed income available-for-sale securities include securities issued by government agencies and 
treasuries, $102.1 million of which are classified as short-term investments and $2.0 million which are classified as cash 
equivalents  on  the  Consolidated  Balance  Sheet.  At  December  31,  2009,  the  Company  had  $18.0  million  invested  in 
money market funds.  At December 31, 2009, there was $0.1 million in unrealized losses from these investments. The 
impact of gross unrealized gains and losses was not material. 

The  Company  adopted  the  provisions  of  ASC  320-10-35  Investments  –  Debt  and  Equity  Securities  –  Overall  – 
Subsequent  Measurement  and  ASC  320-10-50  Investments  –  Debt  and  Equity  Securities  –  Overall  –  Disclosure, 
effective  April  1,  2009  and  used  the  guidelines  therein  to  determine  whether  the  impairment  on  its  available-for-sale 
securities  is  temporary  or  other-than-temporary.  Temporary  impairment  charges  are  recorded  in  accumulated  other 
comprehensive  income  (loss)  within  stockholders’  equity  and  have  no  impact  on  net  income.  Other-than-temporary 
impairment exists when the entity has the intent to sell the security or it will more likely than not be required to sell the 
security before anticipated recovery or it does not expect to recover the entire amortized cost basis of the security. Other-
than-temporary impairment charges are recorded in other income (expense) in the Consolidated Statement of Operations. 

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MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued) 

The following table provides a reconciliation of the beginning and ending balances for the assets measured at fair value 
using significant unobservable inputs (Level 3) (in thousands): 

Beginning balances as of January 1, 2009 
Sales and Settlement 
Unrealized Gain 
Gain (loss) from UBS auction rate securities and put right 
Ending balances at December 31, 2009 
Sales and Settlement 
Unrealized Gain 
Gain (loss) from UBS auction rate securities and put right 
Ending balances at December 31, 2010 

Auction-Rate 
Securities 

     Put Right 

Total 

  $ 

  $ 

  $ 

36,175      $ 
(1,400 )      
270        
525        
35,570      $ 
(17,275 )      
160        
725        
19,180      $ 

1,250      $ 
-        
-        
(525 )      
725      $ 
-        
-        
(725 )      
-      $ 

37,425   
(1,400 ) 
270   
-   
36,295   
(17,275 ) 
160   
-   
19,180   

During  the  year  ended  December  31,  2010,  the  Company  sold  $17.3  million  in  auction  rate  securities  at  par.  Of  this 
amount, $16.9 million was classified as short-term investments and the remaining $0.4 million was classified as long-
term investments. 

In October 2008, the Company accepted an offer to participate in an auction-rate security rights offering from UBS to 
sell up to $18.2 million in face value of eligible auction-rate securities commencing in June 2010. Between October 2008 
and June 2010, $9.6 million of these auction-rate securities were called at par. On June 30, 2010, the Company exercised 
the UBS put right and sold the remaining $8.6 million in auction rate securities at par, for which the sale was completed 
and proceeds were received on July 1, 2010. At December 31, 2009, the Company had $16.9 million in eligible auction-
rate securities remaining at UBS. The impairment related to these auction-rate securities and the corresponding put right 
were valued at $0.7 million. The change in the impairment and the fair value of the put right was recorded in accordance 
with the provisions of ASC 320-10-35 and ASC 320-10-50 in other income (expense) in the Consolidated Statement of 
Operations. 

The Company’s Level 3 assets consist of government-backed student loan auction-rate securities, with interest rates that 
reset  through  a  Dutch  auction  every  7  to  35  days  and  which  became  illiquid  in  2008.  At  December  31,  2010, the 
Company’s investment  portfolio included  $19.2  million,  net  of  impairment  charges  of  $1.0  million,  in  government-
backed  student  loan  auction-rate  securities.  The  underlying  maturity  of  these  auction-rate  securities  is  up  to  37  years. 
Although  it  is  unclear  as  to  when  these  investments  will  regain  their  liquidity,  management  has  concluded  that  as  of 
December 31, 2010 and 2009, the cumulative impairment of $1.0 million and $1.1 million, respectively, was temporary 
based on the following analysis: 

• 

• 

• 

• 

• 

• 

The decline in the fair value of these securities is not largely attributable to adverse conditions specifically 
related to these securities or to specific conditions in an industry or in a geographic area; 
Management possesses both the intent and ability to hold these securities for a period of time sufficient to 
allow for any anticipated recovery in fair value; 
Management believes that it is more likely than not that the Company will not have to sell these securities 
before recovery of its cost basis; 
Except  for  the  credit  loss  of  $70,000  recognized  during  the  year  ended  December  31,  2009  for  the 
Company’s holdings in auction rate securities described below, the Company does not believe that there is 
any  additional  credit  loss  associated  with  other  auction-rate  securities  because  the  Company  expects  to 
recover the entire amortized cost basis; 
The majority of the securities remain AAA rated, with $8.6 million of the auction rate securities having been 
downgraded  by  Moody’s  to  A3-Baa3,  during  the  year  ended  December  31,  2009  and  there  have  been  no 
downgrades during the year ended December 31, 2010; and 
All scheduled interest payments have been made pursuant to the reset terms and conditions. 

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MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued) 

Based on the guidance of ASC 320-10-35 and ASC 320-10-50, the Company evaluated the potential credit loss of each 
of the auction-rate securities that are currently held by the Company. Based on such analysis, the Company determined 
that those securities that are not 100% FFELPS guaranteed are potentially subject to credit risks based on the extent to 
which the underlying debt is collateralized and the security-specific student-loan default rates. The Company’s portfolio 
includes three such securities, one of which has a senior parity ratio of approximately 126%, which is substantially above 
the expected student-loan default rate for that security. Conversely, the senior parity ratio for the other two securities is 
approximately 105%. If, therefore, the student-loan default rate and borrowing rate for these issuers increases, the 
remaining balance in these trusts may not be sufficient to cover the senior debt. The Company therefore concluded that 
there is potential credit risk for these two securities and as such, used the discounted cash flow model to determine the 
amount of credit loss to be recorded. In valuing the potential credit loss, the following parameters were used: 20 year 
expected term, cash flows based on the 90-day t-bill rates for 20 year forwards and a risk premium of 5.9%, the amount 
of interest that the Company was receiving on these securities when the market was last active. As of December 31, 2010 
and 2009, the potential credit loss associated with these securities was $70,000, which the Company deemed other-than-
temporary and recorded in other expense in its Consolidated Statement of Operations during 2009. 

Unless  another  rights  offering  or  other  similar  offers  are  made  to  redeem  at  par  and  accepted  by  the  Company,  the 
Company  intends  to  hold  the  balance  of  these  investments  through  successful  auctions  at  par,  which  the  Company 
believes could take approximately 2.0 years. 

The valuation of the auction-rate securities is subject to fluctuations in the future, which will depend on many factors, 
including  the  collateral  quality,  potential  to  be  called  or  restructured,  underlying  final  maturity,  insurance  guaranty, 
liquidity and market conditions, among others. To determine the fair value of the auction-rate securities at December 31, 
2009, March 31, 2010, June 30, 2010, September 30, 2010 and December 31, 2010, the Company used a discounted cash 
flow  model,  for  which  there  are  three  valuation  parameters,  including  time-to-liquidity,  discount  rate  and  expected 
return. The following are the values used in the discounted cash flow model:  

Time-to-Liquidity 
Expected Return (Based on the 
2-year treasury rate, plus a 
contractual penalty rate) 
Discount Rate (Based on the 
2-year LIBOR, the cost of 
debt and a liquidity risk  
premium) 

December 31, 
2009 
24 months 
2.4% 

March 31, 
2010 
24 months 
2.4% 

June 30,  
2010 
24 months 
2.7% 

September 30, 
2010 
24 months 
2.2% 

December 31, 
2010 
24 months 
2.9% 

5.2% - 10.0%, 
depending on 
the credit-
rating of the 
security 

4.6% - 9.4%, 
depending on 
the credit-
rating of the 
security 

3.8% - 8.6%, 
depending on 
the credit-
rating of the 
security 

3.2% - 8.0%, 
depending on 
the credit-
rating of the 
security 

4.1% - 8.9%, 
depending on 
the credit-
rating of the 
security 

The  gross  accumulated  impairment  charge  was  $1.0  million  as  of  December  31,  2010,  of  which  $0.9  million  was 
recorded  as  temporary  and  $0.1  million  was  previously  recorded  as  other-than-temporary.  The  gross  accumulated 
impairment charge was $1.8 million as of December 31, 2009, of which $1.1 million was recorded as temporary and the 
remaining $0.7 million was recorded as other-than-temporary. 

If the auctions continue to fail, the liquidity of the Company’s investment portfolio may be negatively impacted and the 
value of its investment portfolio could decline.  

56 

 
  
 
 
  
  
   
  
  
  
MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued) 

3. Inventories 

Inventories consist of the following (in thousands): 

Work in progress 
Finished goods 
Total inventories 

4.  Property and Equipment, net 

Property and equipment consist of the following (in thousands): 

Computers, software and equipment 
Leasehold improvements 
Vehicles 
Building 
Furniture and fixtures 
  Total 
Less accumulated depreciation and amortization 
Property and equipment, net 

December 31, 
2010 

December 31, 
2009 

  $ 

  $ 

11,559      $ 
14,230        
25,789      $ 

11,082   
8,534   
19,616   

December 31, 

2010 

2009 

  $ 

  $ 

48,123     $ 
2,302       
944       
15,074       
735       
67,178       
(29,916 )     
37,262     $ 

33,716   
4,894   
657   
459   
355   
40,081   
(22,113 ) 
17,968   

Depreciation expense for the years ended December 31, 2010, 2009 and 2008 was $7.9 million, $6.6 million and $5.7 
million, respectively.  

5.   Accrued Liabilities 

Accrued liabilities consist of the following (in thousands): 

Deferred revenue and customer prepayments 
Legal expenses and settlement costs 
Stock rotation reserve 
Warranty 
Chengdu building construction cost 
Other 
Total accrued liabilities 

December 31, 
2010 

December 31, 
2009 

  $ 

  $ 

3,200     $ 
844       
811       
764       
3,633       
1,947       
11,199     $ 

2,109   
2,940   
864   
294   
-   
1,474   
7,681   

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MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued) 

6.  Stockholders’ Equity 

The Company has two stock option plans and an employee stock purchase plan—the 1998 Stock Option Plan, the 2004 
Equity Incentive Plan and the 2004 Employee Stock Purchase Plan. The Company recognized stock-based compensation 
expenses for the years ended December 31, 2010, 2009 and 2008, as follows (in thousands): 

Non-Employee 
ESPP 
Restricted Stock 
Stock Options 
TOTAL 

1998 Stock Option Plan   

Year ended December 31, 
2009 

2008 

2010 

  $ 

  $ 

(7 )   $ 
609       
8,271       
7,937       
16,810     $ 

118     $ 
671       
3,353       
10,469       
14,611     $ 

42   
676   
3,054   
9,386   
13,158   

Under  the  Company’s  1998 Stock  Option  Plan  (the  1998 Plan),  the  Company  reserved  11,807,024  shares  of  common 
stock for issuance to the Company’s employees, directors and consultants. Options granted under the 1998 Plan have a 
maximum term of ten years and generally vest over four years at the rate of 25 percent one year from the date of grant 
and 1/48th monthly  thereafter. On November 19, 2004, the effective date of the  Company’s initial public offering, the 
1998 Plan  was terminated  for future  grants and the remaining 1,392,750 shares available for grant  were  moved to the 
Company’s 2004 Equity Incentive Plan (the 2004 Plan). In addition, throughout the year, shares underlying options from 
the 1998 Plan that are cancelled (for example, upon termination of service) are transferred to the 2004 Plan based on the 
number of cancellations that occur throughout the year. 

2004 Equity Incentive Plan 

The  Company’s  Board  of  Directors  adopted  the  Company’s  2004  Equity  Incentive  Plan  in  March  2004,  and  the 
Company’s stockholders approved it in November 2004. Options granted under the 2004 Plan have a maximum term of 
ten years. New hire grants generally vest over four years at the rate of 25 percent one year from the date of grant and 
1/48th monthly thereafter. Refresh grants generally vest over four years at the rate of 50 percent two years from the date 
of grant and 1/48th  monthly thereafter. There  were 800,000 shares initially reserved  for issuance  under the 2004 Plan. 
The 2004 Plan provides for annual increases in the number of shares available for issuance beginning on January 1, 2005 
equal to the least of: 5% of the outstanding shares of common stock on the first day of the year, 2,400,000 shares, or a 
number of shares determined by the Board of Directors. The following is a summary of the 2004 Plan, which includes 
stock options and restricted stock awards and units: 

Available for Grant as of December 31, 2009 
2010 Additions to Plan 
2010 Grants 
2010 Cancellations 
Available for Grants as of December 31, 2010 

2,023,943   
1,758,265   
(1,304,740 ) 
477,139   
2,954,607   

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MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued) 

A summary of the status of the Company’s stock option plans at December 31, 2010, 2009 and 2008 and changes therein 
are presented in the table below:  

Weighted 
Average 
Exercise 
Price 

Weighted 
Average 
Remaining 
Contractual 
Term (Years)      

Aggregate 
Intrinsic 
Value 

  Stock Options     

Outstanding at December 31, 2007 (3,722,936 
options exercisable at a weighted-average 
exercise price of $6.94 per share) 
    Options granted (weighted-average fair value  
      of $6.08 per share) 
    Options exercised 
    Options forfeited and expired 
Outstanding at December 31, 2008 (3,766,630 
options exercisable at a weighted-average 
exercise price of $8.26 per share) 
    Options granted (weighted-average fair value  
      of $8.42 per share) 
    Options exercised 
    Options forfeited and expired 
Outstanding at December 31, 2009 (4,112,763 
options exercisable at a weighted-average 
exercise price of $10.93 per share) 
    Options granted (weighted-average fair value  
      of $8.95 per share) 
    Options exercised 
    Options forfeited and expired 
Outstanding at December 31, 2010 
Options exercisable at December 31, 2010 and 
expected to become exercisable 
Options vested and exercisable at December 31, 
2010 

7,442,806      $ 

10.50        

6.64      $ 

81,762,963   

2,566,290      $ 
(1,417,585 )    $ 
(394,874 )    $ 

17.10       
8.97       
14.72       

8,196,637      $ 

12.62        

5.91      $ 

20,193,958   

706,000      $ 
(1,217,272 )    $ 
(274,451 )    $ 

17.52       
9.19       
17.27       

7,410,914      $ 

13.48        

5.04      $ 

77,918,848   

370,500      $ 
(1,452,245 )    $ 
(494,051 )    $ 
5,835,118      $ 

19.92       
9.87       
15.67       
14.61        

4.30      $ 

19,035,591   

5,584,241      $ 

14.46        

4.27      $ 

18,802,775   

4,264,268      $ 

13.33        

4.02      $ 

17,725,853   

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MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued) 

The following summarizes information as of December 31, 2010 concerning outstanding and exercisable options: 

Range of 
Exercises 
Prices 
$0.08 - $5.00 
$7.50 - $10.37         
$10.58 - $12.99         
$13.01 - $15.08         
$15.18 - $15.64         
$15.74 - $15.74         
$16.00 - $17.93         
$17.98 - $19.91         
$20.06 - $22.26         
$22.47 - $25.84         

Number 
of Options 
Outstanding 
as if 
12/31/2010 

Options Outstanding 
Weighted 
Average 
Remaining 
Contractual 
Life (Years) 

Weighted 
Average 
Exercise 
Price 

Options Exercisable 

Number 
of Options 
Exercisable 
as of 
12/31/2010 

Weighted 
Average 
Exercise 
Price 

689,212        
591,598        
609,745        
668,229        
364,288        
610,000        
597,906        
602,265        
617,375        
484,500        
5,835,118       

2.90      $ 
4.08      $ 
3.79      $ 
4.78      $ 
4.15      $ 
4.82      $ 
4.34      $ 
4.40      $ 
5.08      $ 
4.83      $ 

3.63        
8.73        
12.20        
13.62        
15.60        
15.74        
16.53        
18.76        
21.12        
23.76        

689,212      $ 
576,098      $ 
590,780      $ 
426,485      $ 
250,300      $ 
330,415      $ 
457,334      $ 
435,576      $ 
242,253      $ 
265,815      $ 
4,264,268       

3.63   
8.69   
12.22   
13.79   
15.62   
15.74   
16.47   
18.61   
21.39   
23.79   

The total fair value of options that vested was $7.9 million, $10.5 million and $9.4 million, respectively, for the years 
ended December 31, 2010, 2009 and 2008. Total intrinsic value of options exercised was $17.4 million, $15.0 million 
and  $20.5  million,  respectively,  for  the  years  ended  December  31,  2010,  2009  and  2008.  Net  cash  proceeds  from  the 
exercise of stock options were $14.3 million for the year ended December 31, 2010 and $11.2 million for the year ended 
December  31,  2009.  At  December  31,  2010,  unamortized  compensation  expense  related  to  unvested  options  was 
approximately $9.6  million.  The  weighted average period over  which compensation expense related  to these  unvested 
options will be recognized is approximately 1.8 years. 

The  employee  stock-based  compensation  expense  recognized  under  ASC  718-10-30  Compensation  –  Stock 
Compensation – Overall – Initial Measurement, was determined using the Black-Scholes option pricing model. Option 
pricing  models  require  the  input  of  subjective  assumptions  and  these  assumptions  can  vary  over  time.  The  Company 
used the following weighted-average assumptions to determine the fair value of the awards granted during the respective 
periods:  

Expected term (years) 
Expected volatility 
Risk-free interest rate 
Dividend yield 

Year ended December 31, 
2009 

2010 

2008 

4.1        
55.9 %     
1.8 %     
-        

4.1        
60.7 %     
1.8 %     
-        

4.1   
40.1 % 
2.6 % 
-   

In  estimating  the  expected  term,  the  Company  considers  its  historical  stock  option  exercise  experience,  post  vesting 
cancellations  and  remaining  contractual  term  of  the  options  outstanding.  In  estimating  the  expected  volatility,  the 
Company  uses  its  own  historical  data  to  determine  its  estimated  expected  volatility.  The  Company  uses  the  U.S. 
Treasury  yield  for  its  risk-free  interest  rate  and  a  dividend  yield  of  zero  as  it  does  not  issue  dividends.  The  Company 
applies a forfeiture rate that is based on options that have been forfeited historically. 

Restricted Stock 

A  portion  of  the  Company’s  shares  of  common  stock  were  issued  under  restricted  stock  purchase  agreements.  Under 
these agreements, in the event of a termination of an employee, the Company has the right to repurchase the common 
stock  at  the  original  issuance  price  of  $0.001.  The  repurchase  right  expires  over  a  4-year  period.  A  summary  of  our 
restricted stock awards is presented in the table below:  

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MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued) 

Weighted 
Average 
Grant Date 
Fair Value 
Per Share 

Restricted 
Stock Awards     

Weighted 
Average 
Remaining 
Recognition 
Period (Years)   
1.31   

Outstanding at December 31, 2007 
    Awards released 
    Awards forfeited 
Outstanding at December 31, 2008 
    Awards released 
    Awards forfeited 
Outstanding at December 31, 2009 
    Awards released 
Outstanding at December 31, 2010 

175,539     $ 
(88,576 )     
(16,586 )     
70,377     $ 
(57,577 )     
(6,250 )     
6,550     $ 
(6,550 )     
-     $ 

10.86        
10.53       
9.62        
11.55        
11.29        
8.64        
16.62        
16.62        
-        

The  Company  also  grants  restricted  stock  units,  which  vest  generally  over  two  to  four  years  as  determined  by  the 
Company’s Compensation Committee, and are issued upon vesting. A summary of the restricted stock units is presented 
in the table below: 

Restricted 
Stock 
Units 

Weighted 
Average 
Grant Date 
Fair Value 
Per Share 

Weighted 
Average 
Remaining 
Recognition 
Period (Years)   
1.91   

Outstanding at December 31, 2007 
    Awards granted 
    Awards released 
    Awards forfeited 
Outstanding at December 31, 2008 
    Awards granted 
    Awards released 
    Awards forfeited 
Outstanding at December 31, 2009 
    Awards granted 
    Awards released 
    Awards forfeited 
Outstanding at December 31, 2010 

182,500     $ 
311,627       
(96,125 )      
(8,359 )      
389,643     $ 
54,200       
(146,447 )      
(7,500 )      
289,896     $ 
934,240       
(230,874 )      
(33,088 )      
960,174     $ 

15.37        
18.48       
15.39       
15.98        
18.11        
20.93       
18.11       
16.66        
18.67        
20.05        
19.24        
18.38        
19.88        

The total fair value of restricted stock awards and units that vested was $5.5 million, $2.7 million and $3.0 million for 
the years ended December 31, 2010, 2009 and 2008, respectively. The intrinsic value related to restricted stock awards 
and units released for the years ended 2010, 2009 and 2008 was $4.5 million, $3.8 million and $3.4 million, respectively. 
The total intrinsic value of restricted units outstanding at December 31, 2010, 2009 and 2008 were $15.9 million, $7.1 
million and $5.8  million, respectively.  At December 31, 2010, unamortized compensation expense related to unvested 
restricted  stock  units  was  approximately  $11.5  million  with  a  weighted  average  remaining  recognition  period  of  2.9 
years. 

61 

0.48   

0.14   

-   

2.72   

2.22   

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MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued) 

On  February  25,  2010,  the  Board  granted  416,000  performance  units  to  the  Company’s  executive  officers.  These 
performance units generally vest over four years, with a graded acceleration feature that allows all or a portion of these 
awards to be accelerated if certain performance conditions are satisfied. The amount of shares to be accelerated is based 
on achieving certain performance targets, with the minimal acceleration occurring if performance exceeds at least 110% 
of  non-GAAP  earnings  per  share  as  set  forth  in  the  Company’s  annual  operating  plan  approved  by  the  Board,  as 
determined by the Compensation Committee in its sole discretion. The Compensation Committee has the discretion not 
to accelerate any shares, if it so chooses, even if the performance targets are met. Based on the Company’s performance 
in 2010, none of the shares were accelerated. 

2004 Employee Stock Purchase Plan 

Under  the  2004  Employee  Stock  Purchase  Plan  (the  Purchase  Plan),  eligible  employees  may  purchase  common  stock 
through payroll deductions. Participants may not purchase more than 2,000 shares in a six-month offering period or stock 
having  a  value  greater  than  $25,000  in  any  calendar  year  as  measured  at  the  beginning  of  the  offering  period  in 
accordance with the Internal Revenue Code and applicable Treasury Regulations. A total of 200,000 shares of common 
stock were reserved for issuance under the Purchase Plan.  The Purchase Plan provides for an automatic annual increase 
beginning  on  January  1,  2005  by  an  amount  equal  to  the  least  of  1,000,000  shares;  2%  of  the  outstanding  shares  of 
common stock on the first day of the year; or a number of shares as determined by the Board of Directors. For the years 
ended December 31, 2010, 2009 and 2008, 114,387 shares, 161,026 shares and 125,207 shares, respectively, were issued 
under the Purchase Plan. The following is a summary of the Purchase Plan and changes during the year ended December 
31, 2010: 

Available Shares as of December 31, 2009 
2010 Additions to Plan 
2010 Purchases 
Available Shares as of December 31, 2010 

2,553,012   
703,306   
(114,387 ) 
3,141,931   

The  Purchase  Plan  is  considered  compensatory  under  ASC  718-50-25-2  Compensation  –  Stock  Compensation  – 
Employee  Share  Purchase  Plans  –  Recognition,  and  is  accounted  for  in  accordance  with  ASC  718-50-30-2 
Compensation – Stock Compensation – Employee Share Purchase Plans – Initial Measurements – Look-Back Plans. The 
intrinsic  value  for  stock  purchased  was  $0.3  million,  $1.0 million  and  $0.8  million  for  the  years  ended  December  31, 
2010, 2009 and 2008, respectively. The unamortized expense as of December 31, 2010 was $0.1 million, which will be 
recognized  over  0.1  years.  The  Black-Scholes  option  pricing  model  was  used  to  value  the  employee  stock  purchase 
rights. For the years ended December 31, 2010, 2009 and 2008, the following assumptions were used in the valuation of 
the stock purchase rights: 

Expected term (years) 
Expected volatility 
Risk-free interest rate 
Dividend yield 

Year ended December 31, 
2009 

2010 

2008 

0.5        
39.5 %     
0.2 %     
-        

0.5        
79.8 %     
0.4 %     
-        

0.5   
48.3 % 
2.0 % 
-   

Cash proceeds from employee stock purchases for the year ended December 31, 2010, 2009 and 2008 was $1.9 million, 
$1.8 million and $1.8 million, respectively. 

62 

 
  
 
  
  
 
    
    
    
    
  
  
   
  
  
   
  
     
     
  
    
    
    
    
  
  
MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued) 

7.   Net Income Per Share 

Basic net income per share excludes dilution and is computed by dividing net income by the weighted average number of 
common shares outstanding for the period. Diluted net income per share reflects the potential dilution that would occur if 
outstanding  securities  or  other  contracts  to  issue  common  stock  were  exercised  or  converted  into  common  stock,  and 
calculated using the treasury stock method.  For the years ended December 31, 2010, 2009 and 2008, the Company had 
securities outstanding, which could potentially dilute basic net income per share in the future, but were excluded from 
the computation of diluted net loss per share in the periods presented, as their effect would have been anti-dilutive. The 
following table shows the number of shares of common stock issuable upon conversion or exercise of such outstanding 
securities: 

Stock Options 

8.  Income Taxes 

Year ended December 31, 
2009 
2,897,202        

2010 
1,952,379        

2008 
3,241,066   

The  components  of  income  before  income  taxes  for  the  years  ended  December  31,  2010,  2009  and  2008  are  (in 
thousands): 

United States 
International 
Consolidated 

2010 

2009 

2008 

  $ 

  $ 

2,770     $ 
28,650       
31,420     $ 

6,303     $ 
13,845       
20,148     $ 

5,540   
19,902   
25,442   

Federal income taxes have not been provided for the unremitted earnings of foreign subsidiaries totaling $76.0 million 
because such earnings are intended to be permanently reinvested. 

The income tax provision consists of the following (in thousands): 

Current: 
   Federal 
   State 
   Foreign 
Deferred: 
   Federal 
   State 
   Foreign 
Valuation allowance 
Income tax provision 

Year ended December 31, 
2009 

2010 

2008 

  $ 

  $ 

1,369     $ 
15       
534       

(1,415 )     
(848 )     
(61 )     
2,263       
1,857     $ 

344     $ 
70       
147       

315       
(688 )     
(85 )     
371       
474     $ 

(643 ) 
67   
1,082   

(1,245 ) 
(490 ) 
(47 ) 
2,492   
1,216   

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MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued) 

The effective tax rate differs from the applicable U.S. statutory federal income tax rate as follows: 

U.S. statutory federal tax rate 
State taxes, net of federal benefit 
Research and development credits 
Stock compensation 
Foreign income taxed at lower rates 
Subpart F / Inventory transfer 
Decrease of prior year FIN 48 liabilities 
Change in valuation allowance on federal timing differences 
Litigation reserves & Other 
Effective tax rate 

2010 

December 31, 
2009 

2008 

34.0 %     
0.0        
(2.9 )      
5.6        
(35.6 )      
-        
-        
4.3        
0.5        
5.9 %     

34.0 %     
0.1        
(0.9 )      
8.6        
(33.3 )      
-        
-        
(6.0 )      
(0.1 )      
2.4 %     

34.0 % 
0.6   
(2.7 ) 
6.3   
(35.7 ) 
0.3   
(4.4 ) 
5.2   
1.2   
4.8 % 

The components of deferred tax assets and liabilities consist of the following (in thousands): 

Deferred tax assets: 
Research tax credits 
Stock compensation 
Other costs not currently deductible 
Depreciation and amortization 
Total deferred tax assets 
Valuation allowance 
Net deferred tax assets 

December 31, 

2010 

2009 

  $ 

  $ 

6,772     $ 
7,223       
2,290       
769       
17,054       
(16,815 )     
239     $ 

5,982   
6,249   
1,592   
969   
14,792   
(14,614 ) 
178   

As  a  result  of  the  cost  sharing  arrangements  with  the  company’s  international  subsidiaries  (cost  share  arrangements), 
relatively  small  changes  in  costs  that  are  not  subject  to  sharing  under  the  cost  share  arrangements  can  significantly 
impact  the  overall  profitability  of  the  US  entity.  Historically,  the  US  operations  have  shown  an  inconsistent  earnings 
pattern  due  to  litigation  costs  not  subject  to  cost  sharing.  The  Company  evaluated  its  US  valuation  allowance  at 
December 31, 2010 by reviewing both its earnings  history and its expected earnings  for the next 12  months in its  US 
entity.  Because  of  the  US  entity’s  inconsistent  earnings  history  and  uncertainty  of  future  earnings,  the  Company  has 
determined that it is more likely than not that the US deferred tax benefits would not be realized. 

As  of  December  31,  2010,  the  federal  and  state  net  operating  loss  carryforwards  for  income  tax  purposes  were 
approximately $6.9  million and $28.4 million, respectively. The federal net operating  loss carryforwards  will begin to 
expire in 2027 and the State net operating loss carry forwards will expire beginning in 2021. $6.9 million of the federal 
net operating loss carry forwards and $24.7 million of the state operating loss carry forwards are related to excess tax 
benefits as a result of stock option exercises and therefore will be recorded in additional paid-in-capital in the period that 
they become realized. 

As  of  December  31,  2010,  the  Company  had  research  tax  credit  carryforwards  of  $9.5  million  for  federal  income  tax 
purposes,  which  will  begin  to  expire  in  2022  and  $7.8  million  for  state  income  tax  purposes,  which  can  be  carried 
forward  indefinitely.  $2.9  million  of  the  federal  research  tax  credit  and  $0.8  million  of  the  state  research  tax  credit 
carryovers  are  related  to  excess  tax  benefits  as  a  result  of  stock  option  exercises  and  therefore  will  be  recorded  in 
additional-paid-in-capital in the period that they become realized. 

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MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued) 

ASC 740-10 Income Taxes - Overall sets forth the accounting for uncertainty in income taxes recognized in an entity’s 
financial statements and prescribes a recognition threshold and measurement attributes for financial statement disclosure 
of tax positions taken or expected to be taken on a tax return. Under ASC 740-10, the impact of an uncertain income tax 
position on the income tax return must be recognized at the largest amount that is more-likely-than-not to be sustained 
upon audit by the relevant taxing authority. An uncertain income tax position will not be recognized if it has less than a 
50% likelihood of being sustained. Additionally, ASC 740-10 provides guidance on derecognition, classification, interest 
and penalties, accounting in interim periods, disclosure and transition. 

At December 31, 2010, the Company had $9.1 million of unrecognized tax benefits, $5.0 million of which would affect 
its effective tax rate if recognized after considering the valuation allowance. At December 31, 2009, the Company had 
$9.0  million  of  unrecognized  tax  benefits,  $4.9  million  of  which  would  affect  its  effective  tax  rate  if  recognized  after 
considering the valuation allowance. 

A reconciliation of the beginning and ending amount of gross unrecognized tax benefits is as follows (in thousands): 

Balance at January 1, 2008 
Gross increases for tax positions of prior year 
Gross increases for tax position of current year 
Reductions for prior year tax positions 
Reduction due to statutes expiring 
Balance at December 31, 2008 
Gross increases for tax positions of prior year 
Gross increases for tax position of current year 
Reductions for prior year tax positions 
Settlement 
Reduction due to statutes expiring 
Balance at December 31, 2009 
Gross increases for tax positions of prior year 
Gross increases for tax position of current year 
Reductions for prior year tax positions 
Settlement 
Reduction due to statutes expiring 
Balance at December 31, 2010 

  $ 

7,910    
96    
1,794   
                            (1,245)    
(2)    
8,553    
-    
1,080    
-    
(615)    
(12)    
9,006    
-    
983    
-    
(883)    
-    
9,106    

   $ 

The Company recognizes interest and penalties, if any, related to uncertain tax positions in its income tax provision. At 
December  31,  2008,  2009  and  2010,  the  Company  has  approximately  $0.4  million,  $0.5  million  and  $0.6  million 
respectively, of accrued interest related to uncertain tax positions. 

Uncertain tax positions relate to the allocation of income and deductions among the Company’s global entities and to the 
determination of the research and experimental tax credit. The Company estimates that there will be no material changes 
in its uncertain tax positions in the next 12 months. 

The Company files income tax returns in the U.S. federal jurisdiction, and various U.S. states and foreign jurisdictions. 
Generally, the Company is no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by tax 
authorities  for  years  prior  to  2005  because  of  the  statute  of  limitations.  However,  because  the  Company  is  currently 
under an IRS audit for tax years ended December 31, 2006 and December 31, 2007, the statute of limitations for tax year 
ended December 31, 2005 was extended to September 12, 2011. 

Our  U.S.  Federal  income  tax  returns  for  the  years  ended  December  31,  2006  and  December  31,  2007  are  under 
examination  by  the  Internal  Revenue  Service  (“IRS”).  The  IRS  is  also  auditing  the  research  and  development  credits 
generated in the  years 2000 through 2007, which  will be carried forward to future tax  years. We received a Notice of 
Proposed Adjustments (“NOPA”) from the IRS in February 2011 to decrease the amount of research and development 
credits generated in years 2000 through 2007, which we are currently reviewing. 

65 

 
  
 
  
 
  
    
    
      
      
      
      
      
      
      
      
      
      
      
      
      
      
      
 
 
 
 
  
MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued) 

9.  Commitments and Contingencies 

 The following table summarizes the Company’s commitments as of December 31, 2010 (in thousands): 

   Total 
  $ 

2,413      $ 

2011 

2012 

Payments by Period 
2013 

2014 

2015 

1,665      $ 

574      $ 

174      $ 

-      $ 

     Thereafter   
-   
-      $ 

  $ 
  $ 

14,379      $ 
16,792      $ 

14,379      $ 
16,044      $ 

-      $ 
574      $ 

-      $ 
174      $ 

-      $ 
-      $ 

-      $ 
-      $ 

-   
-   

Operating leases 
Outstanding 
purchase 
commitments 

Lease Oligations 

The Company leases it headquarters and sales offices in San Jose, California. The San Jose facility was sold and the new 
landlord has exercised their right to terminate the lease, effective April 18, 2012. In addition, the Company entered into a 
five-year lease arrangement in September 2004 for its manufacturing facility located in Chengdu, China. Pursuant to this 
agreement, the Company contributed capital in the form of cash, in-kind assets, and/or intellectual property, of at least 
$5.0 million to its wholly-owned Chinese subsidiary as the registered capital for the subsidiary and exercised the option 
to purchase land use rights for the facility of approximately $0.2 million. The Company also has the option to acquire the 
facility after a five-year lease term for the original construction cost less rents paid, which is currently estimated at $1.9 
million and which becomes exercisable in March 2011. The Company will likely enter into a purchase agreement for this 
facility  at  a  date  to  be  determined  and  as  the  opportunity  necessitates.  The  Company  also  leases  its  sales  offices  in 
Japan,  China,  Taiwan  and  Korea.  Certain  of  the  Company’s  facility  leases  provide  for  periodic  rent  increases.  Rent 
expense  for  the  years  ended  December  31,  2010,  2009  and  2008  was  $1.8  million,  $1.3  million  and  $1.1  million, 
respectively. 

Warranty and Indemnification Provisions 

The Company provides a standard one-year warranty against defects in materials and workmanship and will either repair 
the  goods, provide replacements at no  charge to the customer, or refund amounts for defective  units. On occasion the 
Company  permits  the  return  of  defective  products  outside  the  normal  warranty  period.  In  such  cases,  the  Company 
accrues for the related costs at the time the decision to permit the return is made. Reserve requirements are recorded in 
the  period  of  sale  and  are  based  on  an  assessment  of  the  products  sold  with  warranty  and  historical  warranty  costs 
incurred. 

The changes in warranty reserves during 2010, 2009 and 2008 are as follows (in thousands): 

Balance at beginning of year 
Warranty costs 
Reserve adjustments and unused warranty provision 
Warranty provision for product sales 
Balance at end of year 

2010 

2009 

2008 

294      $ 
(107 )      
(224 )      
801        
764      $ 

764      $ 
(137 )      
(728 )      
395        
294      $ 

1,025   
(109 ) 
(724 ) 
572   
764   

  $ 

  $ 

The Company provides indemnification agreements to a supplier and certain direct or indirect customers. The Company 
agrees to reimburse these parties for any damages, costs and expenses incurred by them as a result of legal actions taken 
against  them  by  third  parties  for  infringing  upon  their  intellectual  property  rights  as  a  result  of  using  the  Company’s 
products and technologies. These indemnification provisions are varied in their scope and are subject to certain terms, 
conditions, limitations and exclusions.  Such costs were $1.0 million for the year ended December 31, 2009. There were 
no  indemnification  costs  in  2008  and  2010.  These  costs  are  charged  to  operations  as  incurred.  The  Company  also 
provides for indemnification of its directors and officers. 

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MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued) 

10.  Litigation - 

O2Micro 

The Company has been engaged in a number of legal proceedings involving patent infringement claims with O2Micro, 
Inc.  and  its  parent  corporation,  O2Micro  International  Limited  (referred  to  hereinafter  as  “O2Micro”).   There  are  two 
proceedings,  both  involving  O2Micro’s  U.S.  Patent  No.  7,417,382  (‘382  patent).   On  June  18,  2010,  the  U.S. 
International  Trade  Commission  (“ITC”)  issued  a  final  determination  finding  of  no  violation  of  Section  337  by  the 
Company  or  its  customers  in  an  action  brought  by  O2Micro  International,  Ltd.  in  2008.   An  ITC  administrative  law 
judge  had  previously  issued  an  initial  determination  on  April  20,  2010  that  also  found  no  violation.   The  ITC's  final 
determination concludes that  none of the Company’s accused products infringes O2Micro's U.S. Patent No. 7,417,382 
(the '382 patent). 

In  addition  to  the  matter  before  the  ITC,  a  related  case  is  pending  before  the  Northern  District  of  California  Court  in 
Oakland,  California.   Subsequent  to  the  ITC’s  final  determination  finding  of  no  violation,  O2Micro  filed  a  motion  to 
dismiss its claims for infringement of the '382 patent, with prejudice, and covenanted not to sue the Company or any of 
its distributors or customers  for infringement of the  '382 patent.  On June 23, 2010, the court granted this  motion and 
vacated the jury trial that was scheduled on July 12, 2010.  The Company filed a motion seeking recovery of costs and 
attorney  fees  from O2Micro.  On March 3, 2011, the court issued an order granting the  Company’s  motion in part.  It 
ordered  O2Micro  to  pay  $339,315  in  costs  forthwith  and  ordered  the  parties  to  meet  and  confer  to  try  to  reach  an 
agreement as to the reasonable attorneys fees to be paid.  If the parties are unable to reach an agreement, the Company is 
to submit detailed documentation to the court in support of its fees request. 

Linear Technology Corporation 

On July 1, 2008, the United States District Court for the District of Delaware held as a matter of law that the Company 
did not breach its October 1, 2005 Settlement and License Agreement with Linear Technology Corporation (“Linear”).  
Based  upon  that  ruling,  the  Company  anticipates  filing  a  motion  to  seek  recovery  of  its  attorney  fees  when  the  final 
judgment  is  entered.   The  court  has  not  issued  its  final  judgment  concerning  the  patent  validity  and  enforceability 
issues.   

11.  Employee Benefits Plan 

The Company sponsors a 401(k) savings and profit-sharing plan (“the Plan”) for all employees in the United States who 
meet certain eligibility requirements. Participants may contribute up to the amount allowable as a deduction for federal 
income tax purposes. The Company is not required to contribute and did not contribute to the Plan for the years ended 
December 31, 2010, 2009 and 2008. 

12.  Major Customers 

The  following  table  summarizes  the  percentages  of  accounts  receivable,  net  and  corresponding  revenue  for  those 
customers, with accounts receivable balances at year end that accounted for 10% or more of total accounts receivable, 
net  at  the  end  of  2010  and  2009  or  with  sales  that  accounted  for  10%  or  more  of  the  Company’s  revenue  for  each 
respective year: 

Customers 
A 
B 
C 
D 

Revenue 
Year ended December 31, 
2009 

2010 

2008 

Accounts Receivable, Net 
as of December 31, 

2010 

2009 

14 %     
*   
*   
*   

13 %     
10 %     
10 %     
*   

20 %     
10 %     
*   
*   

12 %     
*   
*   
20 %     

*   
*   
*   
15 % 

* Represents less than 10% of accounts receivable, net or revenue 

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MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued) 

13.  Segment Information 

As  defined  by  the  requirements  of  ASC  280-10-55,  Segment  Reporting  –  Overall  –  Implementation  Guidance  and 
Illustrations,  the  Company  operates  in  one  reportable  segment,  the  design,  development,  marketing  and  sale  of  high-
performance,  mixed-signal  analog  semiconductors  for  the  computing,  consumer  electronics  and  communications 
markets.  The  Company’s  chief  operating  decision  maker  is  its  chief  executive  officer.  The  Company  does  not 
specifically allocate any of its resources to or measure the performance of, individual product families. 

The  Company  derived  a  substantial  majority  of  its  revenue  from  sales  to  customers  located  outside  North  America 
during 2010, 2009 and 2008, with geographic revenue based on the customers’ ship-to location. 

The  following  is  a  summary  of  revenue  by  geographic  region  based  on  customer  ship-to  location  for  the  years  ended 
December 31, 2010, 2009 and 2008 (in thousands): 

Country 
China 
Korea 
Taiwan 
Europe 
Japan 
USA 
Other 

Total 

Year ended December 31, 
2009 

2008 

2010 

  $ 

  $ 

105,233     $ 
33,761       
25,840       
20,416       
14,255       
8,415       
10,920       
218,840     $ 

66,694      $ 
32,028        
21,719        
19,251        
11,972        
6,106        
7,238        
165,008     $ 

72,402   
25,747   
21,978   
12,918   
15,583   
4,330   
7,553   
160,511   

The following is a summary of net revenue by product type for the years ended December 31, 2010, 2009 and 2008 (in 
thousands): 

Year ended December 31, 

Product Family 
DC to DC Converters 
Lighting Control Products 
Audio Amplifiers 

Total 

2010 
  $  183,051       
28,554       
7,235       
  $  218,840       

% of 

% of 

Revenue       

2009 

Revenue       

2008 

% of 
Revenue    

83.7 %   $  123,581       
27,836       
13.0 %     
13,591       
3.3 %     
100.0 %   $  165,008       

74.9 %   $  115,373       
32,308       
16.9 %     
12,830       
8.2 %     
100.0 %   $  160,511       

71.9 % 
20.1 % 
8.0 % 
100.0 % 

The following is a summary of long-lived assets by geographic region, excluding restricted assets, as of December 31, 
2010 and 2009 (in thousands): 

China 
United States 
Taiwan 
Japan 
Other 

TOTAL 

December 31, 

2010 

2009 

  $ 

  $ 

34,468     $ 
2,719       
134       
85       
58       
37,464     $ 

15,440   
2,484   
75   
75   
34   
18,108   

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MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued) 

14.  Valuation and Qualifying Accounts 

The Company had insignificant activity and balance in its accounts receivable allowances in 2010, 2009 and 2008.  

15. Stock Repurchase Program 

On July 27, 2010, the Board of Directors approved a stock repurchase program that authorizes MPS to repurchase up to 
$50.0 million in the aggregate of its common stock between August 2, 2010 and December 31, 2011. In February 2011, 
the  Board  of  Directors  approved  an  increase  from  $50.0  million  to  $70.0  million.  As  of  December  31,  2010,  the 
following shares have been repurchased through the open market and subsequently retired: 

2010 Calendar Year 
August 
November 

Total Shares Repurchased 

Shares 

Repurchased     

983,189      $ 
916,600      $ 
1,899,789       

Average 
Price per 
Share 

Value 
(in thousands)   
16,998   
14,529   
31,527   

17.29      $ 
15.85      $ 
       $ 

On  February  5,  2008,  the  Company  announced  that  its  Board  of  Directors  approved  a  stock  repurchase  program  that 
authorizes the Company to repurchase up to $25.0 million of its common stock through the end of 2008. As of December 
31, 2008, the following shares have been repurchased through the open market and subsequently retired: 

2008 Calendar Year 
February 
March 
April 
May 
June 
July 
August 
September 
October 

Total Shares Repurchased 

There were no shares repurchased in 2009. 

Shares 

Repurchased     

Average 
Price per 
Share 

Value 
(in thousands)   
464   
9,028   
4,043   
2   
390   
309   
2   
5,784   
5,021   
25,043   

16.88      $ 
17.12      $ 
20.03      $ 
21.98      $ 
21.66      $ 
21.86      $ 
22.03      $ 
18.82      $ 
15.05      $ 
       $ 

27,500      $ 
527,332      $ 
201,863     $ 
100     $ 
18,000     $ 
14,155     $ 
100     $ 
307,355     $ 
333,700     $ 
1,430,105       

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MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued) 

16.           Quarterly Financial Data (Unaudited) 

Revenue 
Cost of revenue* 

Gross profit 
Operating expenses: 

Research and development* 
Selling, general and administrative* 
Litigation expense 

Three months ended 

March 31, 
2010 

June 30, 
2010 

September 
30, 
2010 

December 
31, 
2010 

  $ 

50,250      $ 
20,954        

55,690      $ 
23,256        

65,843      $ 
29,857        

47,057   
23,316   

29,296        

32,434        

35,986        

23,741   

11,040        
10,393        
1,567        

11,785        
11,615        
2,228        

11,291        
10,296        
964        

10,256   
8,865   
659   

Total operating expenses 

23,000        

25,628        

22,551        

19,780   

Income from operations 
Other income (expense): 

Interest and other income 
Interest and other expense 

6,296        

6,806        

13,435        

3,961   

347        
-        

338        
(4 )      

240        
(159 )      

Total other income, net 

347        

334        

81        

Income before income taxes 
Income tax provision 

Net income 
Basic net income per share 
Diluted net income per share 

6,643        
287        

7,140        
733        

13,516        
297        

  $ 
  $ 
  $ 

6,356      $ 
0.18     $ 
0.17      $ 

6,407      $ 
0.18     $ 
0.17      $ 

13,219      $ 
0.37     $ 
0.35      $ 

231   
(71 ) 

160   

4,121   
540   

3,581   
0.10   
0.10   

Weighted average common shares outstanding 
Stock options and restricted stock 
Diluted weighted-average common equivalent shares 
outstanding 

35,421        
2,362        

36,291        
2,064        

36,185        
1,542        

35,420   
1,309   

37,783        

38,355        

37,727        

36,729   

* Stock-based compensation has been included in the following line items: 

Cost of revenue 
Research and development 
Selling, general and administrative 
Total 

  $ 

  $ 

79      $ 
1,735        
2,210        
4,024      $ 

116      $ 
1,995        
3,428        
5,539      $ 

70      $ 
1,647        
2,445        
4,162      $ 

128   
1,365   
1,592   
3,085   

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MONOLITHIC POWER SYSTEMS, INC. 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued) 

Revenue 
Cost of revenue* 

Gross profit 
Operating expenses: 

Research and development* 
Selling, general and administrative* 
Litigation expense 
Litigation provision reversal, net 

Three months ended 

March 31, 
2009 

June 30, 
2009 

September 
30, 
2009 

December 
31, 
2009 

  $ 

29,322      $ 
12,431        

41,173      $ 
16,823        

47,966      $ 
18,868        

46,547   
19,208   

16,891        

24,350        

29,098        

27,339   

8,117        
7,808        
2,046        
-        

9,732        
9,321        
2,233        
-        

10,080        
9,438        
2,811        
(6,356 )      

10,366   
10,185   
2,367   
-   

Total operating expenses 

17,971        

21,286        

15,973        

22,918   

Income (loss) from operations 
Other income (expense): 

Interest and other income 
Interest and other expense 

(1,080 )      

3,064        

13,125        

4,421   

385        
(94 )      

281        
(185 )      

161        
(76 )      

Total other income, net 

291        

96        

85        

Income (loss) before income taxes 
Income tax provision (benefit) 

Net income (loss) 
Basic net income (loss) per share 
Diluted net income (loss) per share 

(789 )      
(61 )      

3,160        
(26 )      

13,210        
648        

  $ 
  $ 
  $ 

(728 )    $ 
(0.02 )   $ 
(0.02 )    $ 

3,186      $ 
0.09     $ 
0.09      $ 

12,562      $ 
0.36     $ 
0.34      $ 

220   
(74 ) 

146   

4,567   
(87 ) 

4,654   
0.13   
0.12   

Weighted average common shares outstanding 
Stock options and restricted stock 
Diluted weighted-average common equivalent shares 
outstanding 

33,696        
-        

34,070        
2,319        

34,552        
2,695        

34,987   
2,418   

33,696        

36,389        

37,247        

37,405   

* Stock-based compensation has been included in the following line items: 

Cost of revenue 
Research and development 
Selling, general and administrative 
Total 

  $ 

  $ 

81      $ 
1,560        
1,772        
3,413      $ 

67      $ 
1,687        
2,098        
3,852      $ 

69      $ 
1,409        
1,688        
3,166      $ 

29   
1,752   
2,399   
4,180   

71 

 
  
  
  
   
  
  
   
  
    
    
    
  
    
   
    
        
        
        
    
    
    
        
        
        
    
    
    
    
    
   
    
        
        
        
    
    
   
    
        
        
        
    
    
    
        
        
        
    
    
    
   
    
        
        
        
    
    
   
    
        
        
        
    
    
    
   
    
        
        
        
    
   
    
        
        
        
    
    
    
    
   
    
        
        
        
    
      
    
    
    
  
  
ITEM 9.               CHANGES IN AND DISAGREEEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND 
FINANCIAL DISCLOSURE 

None 

ITEM 9A.            CONTROLS AND PROCEDURES 

Evaluation of Disclosure Controls and Procedures 

Our  management,  with  the  participation  of  our  chief  executive  officer  and  chief  financial  officer,  evaluated  the 
effectiveness  of  our  disclosure  controls  and  procedures  pursuant  to  Rule  13a-15(e)  and  Rule  15d-15(e)  under  the 
Securities  Exchange  Act  of  1934  as  of  the  end  of  the  period  covered  by  this  Annual  Report  on  Form  10-K.   Our 
disclosure controls and procedures have been designed to ensure that material information relating to us, including our 
consolidated subsidiaries, required to be disclosed by us in reports that we file or submit under the Securities Exchange 
Act  of  1934  is  recorded,  processed,  summarized  and  reported  within  the  time  periods  specified  in  the  Securities  and 
Exchange Commission rules and forms. In designing and evaluating the disclosure controls and procedures, management 
recognizes  that  any  controls  and  procedures,  no  matter  how  well  designed  and  operated,  can  provide  only  reasonable 
assurance of achieving the desired control objectives.  In addition, the design of disclosure controls and procedures must 
reflect the fact that there are resource constraints and that management is required to apply its judgment in evaluating the 
benefits of possible controls and procedures relative to their costs. 

Based on our evaluation, our chief executive officer and chief financial officer concluded that our disclosure controls and 
procedures  are  effective  at  December  31,  2010  and  provide  reasonable  assurance  that  information  we  are  required  to 
disclose in reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within 
the  time  periods  specified  in  Securities  and  Exchange  Commission  rules  and  forms,  and  that  such  information  is 
accumulated and communicated to our management, including our chief executive officer and chief financial officer, as 
appropriate, to allow timely decisions regarding required disclosure. 

Management’s Annual Report on Internal Control over Financial Reporting 

Our management, including our Chief Executive Officer and Chief Financial Officer, is responsible for establishing and 
maintaining adequate internal control over financial reporting, as such term is defined in Exchange Act Rule 13a-15(f) 
and  Rule  15d-(f).  Our  internal  control  over  financial  reporting  is  a  process  designed  to  provide  reasonable  assurance 
regarding  the  reliability  of  financial  reporting  and  the  preparation  of  our  financial  statements  for  external  purposes  in 
accordance with generally accepted accounting principles (“GAAP”). 

Our internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of 
records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of our assets; (2) provide 
reasonable  assurance  that  transactions  are  recorded  to  permit  preparation  of  financial  statements  in  accordance  with 
generally accepted accounting principles, and that receipts and expenditures of the company are made only in accordance 
with  authorizations  of  our  management  and  directors;  and  (3) provide  reasonable  assurance  regarding  prevention  or 
timely  detection  of  unauthorized  acquisition,  use  or  disposition  of  our  assets  that  could  have  a  material  effect  on  our 
financial statements. 

A deficiency in internal control over financial reporting exists when the design or operation of a control does not allow 
management  or  employees,  in  the  normal  course  of  performing  their  assigned  functions,  to  prevent  or  detect 
misstatements on a timely basis. A deficiency in design exists when (a) a control necessary to meet the control objective 
is missing or (b) an existing control is not properly designed so that, even if the control operates as designed, the control 
objective  would  not  be  met.  A  deficiency  in  operation  exists  when  a  properly  designed  control  does  not  operate  as 
designed, or when the person performing the control does not possess the necessary authority or competence to perform 
the control effectively. A significant deficiency is a deficiency, or a combination of deficiencies, in internal control over 
financial  reporting  that  is  less  severe  than  a  material  weakness,  yet  important  enough  to  merit  attention  by  those 
responsible for oversight of the company’s financial reporting. A material weakness is a deficiency, or a combination of 
deficiencies,  in  internal  control  over  financial  reporting,  such  that  there  is  a  reasonable  possibility  that  a  material 
misstatement of the company’s annual or interim financial statements will not be prevented or detected on a timely basis. 

Our management, including our Chief Executive Officer and Chief Financial Officer, assessed the effectiveness of our 
internal control over financial reporting as of December 31, 2010. In performing this assessment, management used the 

72 

 
  
  
  
  
  
  
  
 
  
  
criteria  established  by  the  Committee  of  Sponsoring  Organizations  of  the  Treadway  Commission  (COSO)  in  Internal 
Control— Integrated Framework. Based upon this assessment, our management has concluded that, as of December 31, 
2010, our internal control over financial reporting was effective. 

Our  independent  registered  public  accounting  firm,  Deloitte  &  Touche  LLP,  which  audited  the  consolidated  financial 
statements included in this annual report on Form 10-K, has issued an attestation report, included elsewhere herein, on 
the effectiveness of our internal control over financial reporting. 

Inherent Limitations on Effectiveness of Controls 

While  our  disclosure  controls  and  procedures  and  internal  control  over  financial  reporting  are  designed  to  provide 
reasonable  assurance  that  their  respective  objectives  will  be  met,  we  do  not  expect  that  our  disclosure  controls  and 
procedures or our internal control over financial reporting are or will be capable of preventing or detecting all errors and 
all  fraud.  Any  control  system,  no  matter  how  well  designed  and  operated,  can  provide  only  reasonable,  not  absolute, 
assurance that the control system’s objectives will be met. The design of a control system must reflect the fact that there 
are resource constraints, and the benefits of controls must be considered relative to their costs. Further, because of the 
inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that misstatements 
due to error or fraud will not occur or that all control issues and instances of fraud, if any, within the company have been 
detected.  These  inherent  limitations  include  the  realities  that  judgments  in  decision-making  can  be  faulty  and  that 
breakdowns can occur because of simple error or mistake. Controls can also be circumvented by the individual acts of 
some persons, by collusion of two or more people, or by management override of the controls. The design of any system 
of controls is based in part on certain assumptions about the likelihood of future events, and there can be no assurance 
that  any  design  will  succeed  in  achieving  its  stated  goals  under  all  potential  future  conditions.  Projections  of  any 
evaluation of controls effectiveness to future periods are subject to risks. 

Changes in Internal Control Over Financial Reporting 

There were no changes in our internal control over financial reporting that occurred during the quarter ended December 
31,  2010  that  have  materially  affected  or  are  reasonably  likely  to  materially  affect,  our  internal  control  over  financial 
reporting. 

ITEM 9B.            OTHER INFORMATION 

None 

PART III 

ITEM 10.             DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE 

Reference is made to the information regarding directors and nominees, code of ethics, corporate governance matters and 
disclosure  relating  to  compliance  with  Section  16(a)  of  the  Securities  Exchange  Act  of  1934  appearing  under  the 
captions “Election of Directors” and “Compliance with Section 16(a) Beneficial Ownership Reporting Compliance” in 
our  Proxy  Statement  for  our  Annual  Meeting  of  Stockholders  to  be  held  on  June  16,  2011,  which  information  is 
incorporated  in  this  Form  10-K  by  reference.  Information  regarding  executive  officers  is  set  forth  under  the  caption 
“Executive Officers of the Registrant” in Part I of this Form 10-K. 

ITEM 11.             EXECUTIVE COMPENSATION 

The information required by this item is set forth under “Executive Officer Compensation” in our Proxy Statement for 
the 2011 Annual Meeting of Stockholders, and is incorporated herein by reference. 

ITEM  12.              SECURITY  OWNERSHIP  OF  CERTAIN  BENEFICIAL  OWNERS  AND  MANAGEMENT 
AND RELATED STOCKHOLDER MATTERS 

The information required by this item is set forth under the captions “Security Ownership of Certain Beneficial Owners 
and Management” and “Equity Compensation Plan Information” in our Proxy Statement for the 2011 Annual Meeting of 
Stockholders, and is incorporated herein by reference. 

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ITEM  13.            CERTAIN  RELATIONSHIPS  AND  RELATED  TRANSACTIONS,  AND  DIRECTOR 
INDEPENDENCE 

The information required by this item is set forth under the captions “Certain Relationships and Related Transactions” 
and “Election of Directors” in our Proxy Statement for the 2011 Annual Meeting of Stockholders, and is incorporated 
herein by reference. 

ITEM 14.             PRINCIPAL ACCOUNTING FEES AND SERVICES 

The information required by this item is set forth under the caption “Accounting Fees” in our Proxy Statement for the 
2011 Annual Meeting of Stockholders, and is incorporated herein by reference. 

ITEM 15.             EXHIBITS, FINANCIAL STATEMENT SCHEDULES. 

PART IV 

   (a) Documents filed as part of this report 

(1) All financial statements 

Index to Financial Statements 

Report of Independent Registered Public Accounting Firm 
Consolidated Balance Sheets 
Consolidated Statements of Operations 
Consolidated Statements of Stockholders’ Equity 
Consolidated Statements of Cash Flows 
Notes to Consolidated Financial Statements 

(2) Schedules 

All  schedules  have  been  omitted  because  the  required  information  is  not  present  or  not  present  in  amounts 
sufficient  to  require  submission  of  the  schedules,  or  because  the  information  required  is  included  in  the  consolidated 
financial statements or notes thereto. 

(3) Exhibits 

The exhibits listed on the accompanying index to exhibits  in Item 15(b) below are filed as part of, or hereby 

incorporated by reference into, this Form 10-K. 

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(b) Exhibits 

Description 
  ended and Restated Certificate of Incorporation. 
  ended and Restated Bylaws. 

Exhibit 
Number 
3.1 (1)   
3.2 (2)   
10.1+ (3)      istrant’s 1998 Stock Plan and form of option agreement. 
10.2+ (4)       istrant’s Amended 2004 Equity Incentive Plan and form of option agreement. 
10.3+ (5)      istrant’s 2004 Employee Stock Purchase Plan and form of subscription agreement. 
10.4+ (6)      m of Directors’ and Officers’ Indemnification Agreement. 
10.5† (7) 

10.6 (8)   

ndry  Agreement  between  the  Registrant  and  Advanced  Semiconductor  Manufacturing  Corp.  of  Shanghai, 
dated August 14, 2001. 
Office  Lease,  First  Amendment  to  Office  Lease,  and  Second  Amendment  to  Office  Lease  between  the 
Registrant  and  Boccardo  Corporation,  dated  May  6,  2002,  October  30,  2003,  and  May  6,  2004, 
respectively. 
  ployment Agreement with Michael Hsing and Amendment thereof. 

10.7+ (9)  
10.8+ (10)    ployment Agreement with Maurice Sciammas and Amendment thereof. 
10.9+ (11)    ployment Agreement with Jim Moyer. 
10.10+ (12)   ployment Agreement with Deming Xiao and Amendment thereof. 
10.11+ (13)   ployment Agreement with Paul Ueunten and Amendment thereof. 
10.12 (14)    ribution Agreement with Asian Information Technology Inc. Ltd., dated March 1, 2004. 
10.13 (15)    iness Purchase Agreement with Uppertech Hong Kong Ltd., dated March 1, 2004. 
10.14† (16)   stment and Cooperation Contract, dated August 19, 2004. 
10.15† (17)   nt License Agreement, dated May 1, 2004. 
10.16† (18)   lement Agreement with Linear Technology Corporation. 
10.17+ (19)   ployment Agreement with C. Richard Neely, Jr. and Amendment thereof 
10.18 (20)    lement Agreement with Microsemi Corporation. 
10.19 (21)    lement Agreement with Micrel Corporation. 
10.20+ (22)   ployment Agreement with Adriana Chiocchi and Amendment thereof. 
10.21+ (23)   m of Performance Unit Agreement. 
10.22 (24) 

lease Agreement between the Registrant and FedEx Freight West, Inc. and Brokaw Interests dated June 13, 
2006. 

10.23+ (25)   er Agreement with Victor Lee. 
10.24 (26) 

Sublease Agreement between the Registrant and Anchor Bay Technologies for the property located at 983 
University Avenue, Building A, Los Gatos, CA 95032 dated May 14, 2007. 

10.25+ (27)   er Agreement with Douglas McBurnie. 
10.26+ (28)   er Agreement with Karen A. Smith Bogart. 
10.27 (29)    Settlement Agreement with Taiwan Sumida Electronics. 
10.28+ (30)   istrant’s Employee Bonus Plan, as amended effective March 6, 2008. 
10.29 (32)    Lease Agreement between the Registrant and Brokaw Interests, dated October 23, 2008 
10.30 (33)    Form of Restricted Stock Award Agreement 
10.31+ (36)   mination Agreement between the Company and Adriana Chiocchi, dated December 15, 2009 
10.32+ (35)   er Agreement with Jeff Zhou 
10.33 
14.1 (31) 
21.1 (34) 
23.1 
24.1 
31.01 

  ployment Agreement with Meera P. Rao and Amendment thereof 
  Code of Ethics. 
  Subsidiaries of Monolithic Power Systems, Inc. 
  Consent of Independent Registered Public Accounting Firm. 
  Power of Attorney (included on Signature page to this Form 10-K). 
Certification  of  Chief  Executive  Officer  pursuant  to  Securities  Exchange  Act  Rules  13a-14(a)  and  15d-
14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. 
Certification  of  Chief  Financial  Officer  pursuant  to  Securities  Exchange  Act  Rules  13a-14(a)  and  15d-
14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. 
Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as 
adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. 

31.02 

32.01* 

+ 
† 

Management contract or compensatory plan or arrangement. 
Confidential  treatment  requested  for  portions  of  this  agreement,  which  portions  have  been  omitted  and  filed 
separately with the Securities and Exchange Commission 

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* 

(1) 

(2) 

(3) 

(4) 

(5) 

(6) 

(7) 

(8) 

(9) 

(10) 

(11) 

(12) 

(13) 

(14) 

(15) 

(16) 

 (17) 

(18) 

(19) 

(20) 

(21) 

(22) 

(23) 

This exhibit shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934 or 
otherwise subject to the liabilities of that Section, nor shall it be deemed incorporated by reference in any filings 
under the Securities Act of 1933 or the Securities Exchange Act of 1934, whether made before or after the date 
hereof and irrespective of any general incorporation language in any filings. 
Incorporated by reference to Exhibit 3.2 of the Registrant’s Form S-1 Registration Statement (Registration No. 
333-117327), declared effective by the Securities and Exchange Commission on November 18, 2004. 
Incorporated by reference to Exhibit 3.4 of the Registrant’s Form S-1 Registration Statement (Registration No. 
333-117327), declared effective by the Securities and Exchange Commission on November 18, 2004. 
Incorporated by reference to Exhibit 10.1 of the Registrant’s Form S-1 Registration Statement (Registration No. 
333-117327), declared effective by the Securities and Exchange Commission on November 18, 2004. 
Incorporated by reference to Exhibit 10.2 of the Registrant’s Form S-1 Registration Statement (Registration No. 
333-117327),  declared  effective  by  the  Securities  and  Exchange  Commission  on  November  18,  2004  and  to 
exhibits  9.01(c)(1)  and  (2)  to  the  Registrant’s  Current  Report  on  Form  8-K,  filed  with  the  Securities  and 
Exchange Commission on December 7, 2004. 
Incorporated by reference to Exhibit 10.3 of the Registrant’s Form S-1 Registration Statement (Registration No. 
333-117327), declared effective by the Securities and Exchange Commission on November 18, 2004. 
Incorporated by reference to Exhibit 10.4 of the Registrant’s Form S-1 Registration Statement (Registration No. 
333-117327), declared effective by the Securities and Exchange Commission on November 18, 2004. 
Incorporated by reference to Exhibit 10.5 of the Registrant’s Form S-1 Registration Statement (Registration No. 
333-117327), declared effective by the Securities and Exchange Commission on November 18, 2004. 
Incorporated by reference to Exhibit 10.6 of the Registrant’s Form S-1 Registration Statement (Registration No. 
333-117327), declared effective by the Securities and Exchange Commission on November 18, 2004. 
Incorporated  by  reference  to  Exhibit  10.7  of  the  Registrant’s  current  report  on  Form  8-K  filed  with  the 
Securities and Exchange Commission on March 11, 2008 and Exhibit 10.1 of the Registrant’s current report on 
Form 8-K filed with the Securities and Exchange Commission on December 19, 2008. 
Incorporated  by  reference  to  Exhibit  10.8  of  the  Registrant’s  current  report  on  Form  8-K  filed  with  the 
Securities and Exchange Commission on March 11, 2008 and Exhibit 10.3 of the Registrant’s current report on 
Form 8-K filed with the Securities and Exchange Commission on December 19, 2008. 
Incorporated by reference to Exhibit 10.9 of the Registrant’s Form S-1 Registration Statement (Registration No. 
333-117327), declared effective by the Securities and Exchange Commission on November 18, 2004. 
Incorporated  by  reference  to  Exhibit  10.10  of  the  Registrant’s  current  report  on  Form  8-K  filed  with  the 
Securities and Exchange Commission on March 11, 2008 and Exhibit 10.4 of the Registrant’s current report on 
Form 8-K filed with the Securities and Exchange Commission on December 19, 2008. 
Incorporated  by  reference  to  Exhibit  10.11  of  the  Registrant’s  current  report  on  Form  8-K  filed  with  the 
Securities and Exchange Commission on March 11, 2008 and Exhibit 10.6 of the Registrant’s current report on 
Form 8-K filed with the Securities and Exchange Commission on December 19, 2008. 
Incorporated by  reference  to  Exhibit  10.11  of  the  Registrant’s  Form  S-1  Registration  Statement  (Registration 
No. 333-117327), declared effective by the Securities and Exchange Commission on November 18, 2004. 
Incorporated by  reference  to  Exhibit  10.12  of  the  Registrant’s  Form  S-1  Registration  Statement  (Registration 
No. 333-117327), declared effective by the Securities and Exchange Commission on November 18, 2004. 
Incorporated by  reference  to  Exhibit  10.13  of  the  Registrant’s  Form  S-1  Registration  Statement  (Registration 
No. 333-117327), declared effective by the Securities and Exchange Commission on November 18, 2004. 
Incorporated by  reference  to  Exhibit  10.14  of  the  Registrant’s  Form  S-1  Registration  Statement  (Registration 
No. 333-117327), declared effective by the Securities and Exchange Commission on November 18, 2004. 
Incorporated  by  reference  to  Exhibit  10.1  of  the  Registrant’s  quarterly  report  on  Form  10-Q,  filed  with  the 
Securities and Exchange Commission on March 13, 2006. 
Incorporated  by  reference  to  Exhibit  10.17  of  the  Registrant’s  current  report  on  Form  8-K  filed  with  the 
Securities and Exchange Commission on March 11, 2008 and Exhibit 10.2 of the Registrant’s current report on 
Form 8-K filed with the Securities and Exchange Commission on December 19, 2008. 
Incorporated  by  reference  to  Exhibit  10.18  of  the  Registrant’s  annual  report  on  Form  10-K,  filed  with  the 
Securities and Exchange Commission on March 28, 2006. 
Incorporated  by  reference  to  Exhibit  10.1  of  the  Registrant’s  current  report  on  Form  8-K  filed  with  the 
Securities and Exchange Commission on September 22, 2006. 
Incorporated  by  reference  to  Exhibit  10.20  of  the  Registrant’s  current  report  on  Form  8-K  filed  with  the 
Securities and Exchange Commission on March 11, 2008 and Exhibit 10.5 of the Registrant’s current report on 
Form 8-K filed with the Securities and Exchange Commission on December 19, 2008. 
Incorporated  by  reference  to  Exhibit  10.1  of  the  Registrant’s  current  report  on  Form  8-K  filed  with  the 
Securities and Exchange Commission on November 1, 2006. 

76 

 
(24) 

(25) 

(26) 

(27) 

(28) 

(29) 

(30) 

(31) 

(32) 

(33) 

(34) 

(35) 

(36) 

Incorporated  by  reference  to  Exhibit  99.1  of  the  Registrant’s  current  report  on  Form  8-K  filed  with  the 
Securities and Exchange Commission on June 16, 2006. 
Incorporated  by  reference  to  Exhibit  10.1  of  the  Registrant’s  current  report  on  Form  8-K  filed  with  the 
Securities and Exchange Commission on September 14, 2006. 
Incorporated by reference to Exhibit 10 of the Registrant’s current report on Form 8-K filed with the Securities 
and Exchange Commission on May 17, 2007 
Incorporated  by  reference  to  Exhibit  10.1  of  the  Registrant’s  current  report  on  Form  8-K  filed  with  the 
Securities and Exchange Commission on May 25, 2007 
Incorporated  by  reference  to  Exhibit  10.2  of  the  Registrant’s  current  report  on  Form  8-K  filed  with  the 
Securities and Exchange Commission on May 25, 2007 
Incorporated  by  reference  to  Exhibit  10.5  of  the  Registrant’s  quarterly  report  on  Form  10-Q  filed  with  the 
Securities and Exchange Commission on August 1, 2007. 
Incorporated  by  reference  to  Exhibit  10.31  of  the  Registrant’s  annual  report  on  Form  10-K  filed  with  the 
Securities and Exchange Commission on March 11, 2008. 
Incorporated  by  reference  to  Exhibit  14.1  of  the  Registrant’s  annual  report  on  Form  10-K  filed  with  the 
Securities and Exchange Commission on March 16, 2007. 
Incorporated by reference to Exhibit 10 of the Registrant’s current report on Form 8-K filed with the Securities 
and Exchange Commission on October 24, 2008. 
Incorporated  by  reference  to  Exhibit  10.1  of  the  Registrant’s  current  report  on  Form  8-K  filed  with  the 
Securities and Exchange Commission on February 15, 2008. 
Incorporated  by  reference  to  Exhibit  21.1  of  the  Registrant’s  annual  report  on  Form  10-K  filed  with  the 
Securities and Exchange Commission on February 27, 2009. 
Incorporated  by  reference  to  Exhibit  10.1  of  the  Registrant’s  current  report  on  Form  8-K  filed  with  the 
Securities and Exchange Commission on February 2, 2010. 
Incorporated  by  reference  to  Exhibit  10.31  of  the  Registrant’s  annual  report  on  Form  10-K  filed  with  the 
Securities and Exchange Commission on February 16, 2010. 

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Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has 

duly caused this Form 10-K to be signed on its behalf by the undersigned, thereunto duly authorized. 

SIGNATURES 

Date: March 4, 2011 

MONOLITHIC POWER SYSTEMS, INC.   

By:  /s/ MICHAEL R. HSING 
   hael R. Hsing 

President and Chief Executive Officer 

KNOW  ALL  PERSONS  BY  THESE  PRESENTS,  that  each  person  whose  signature  appears  below 
constitutes and appoints Michael R. Hsing and Meera P. Rao, and each of them, as his true and lawful attorneys-in-fact 
and agents, with full power of substitution and re-substitution, for him and in his name, place, and stead, in any and all 
capacities,  to  sign  any  and  all  amendments  to  this  Report,  and  to  file  the  same,  with  all  exhibits  thereto,  and  other 
documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact 
and  agents,  and  each  of  them,  full  power  and  authority  to  do  and  perform  each  and  every  act  and  thing  requisite  and 
necessary  to  be  done  in  connection  therewith,  as  fully  to  all  intents  and  purposes  as  he  might  or  could  do  in  person, 
hereby  ratifying  and  confirming  that  all  said  attorneys-in-fact  and  agents,  or  any  of  them  or  their  or  his  substitute  or 
substituted, may lawfully do or cause to be done by virtue hereof. 

Pursuant  to  the  requirements  of  the  Securities  Exchange  Act  of  1934,  this  report  has  been  signed  below  on 

March 4, 2011 by the following persons on behalf of the registrant and in the capacities indicated: 

/S/  MICHAEL R. HSING 
MICHAEL R. HSING 

  President, Chief Executive Officer, and Director (Principal Executive Officer) 

/S/ MEERA P. RAO 
MEERA P. RAO 

  Chief Financial Officer (Principal Financial and Accounting Officer and  
  Duly Authorized Officer) 

/S/  KAREN A. SMITH BOGART 
 KAREN A. SMITH BOGART 

  Director 

/S/ HERBERT CHANG 
HERBERT CHANG 

/S/  VICTOR K. LEE 
VICTOR K. LEE 

  Director 

  Director 

/S/  DOUGLAS MCBURNIE        
DOUGLAS MCBURNIE 

  Director 

/S/  JAMES C. MOYER         
JAMES C. MOYER 

/S/  UMESH PADVAL 
UMESH PADVAL 

/S/  JEFF ZHOU 
JEFF ZHOU 

  Director 

  Director 

  Director 

78