02MICRO'S BATTERY FUEL GUAGE CIRCUIT RECEIVES PATENT

Date22-Jun-2009

O2Micro’s Battery Fuel Gauge Circuit Receives Patent

 

GEORGE TOWN, Grand Cayman, June 17, 2009. O2Micro® International Limited (NASDAQ®: OIIM;

SEHK: 0457), a leading supplier of innovative power management and security components, was issued

17 claims under United States patent number 7,531,989 for its Battery Fuel Gauge Circuit.

This patented circuit measures the State-of-Charge (SOC) or capacity of a rechargeable battery pack.

This patent simultaneously enables an accurate and cost effective circuit for measuring battery pack SOC

for users to gauge the ability to complete their tasks. For example: notebook, cell phone, digital camera

and other portable electronic appliances.

William Kao, vice president, O2Micro, commented “This invention accurately and efficiently predicts the

remaining capacity of rechargeable batteries.”

About O2Micro

Founded in April 1995, O2Micro develops and markets innovative power management, and security

components for the Computer, Consumer, Industrial, and Communications markets. Products include

Intelligent Lighting, Battery Management, Power Management, and SmartCardBus® products.

O2Micro International maintains an extensive portfolio of intellectual property with 11,830 patent claims

granted, and over 14,000 more pending. The company maintains offices worldwide. Additional company

and product information can be found on the company website at www.o2micro.com.

O2Micro, the O2Micro logo, SmartCardBus, and combinations thereof are registered trademarks of

O2Micro. All other trademarks are the property of their respective owners.

Statements made in this release that are not historical, including statements regarding O2Micro's or

management's intentions, hopes, beliefs, expectations, representations, projections, plans or predictions

of the future, are forward-looking statements within the meaning of the Private Securities Litigation

Reform Act of 1995. Such statements involve risks and uncertainties that may cause actual results to

differ materially from those set forth in these statements. Factors that could cause actual results to differ

materially include risks and uncertainties such as reduced demand for products of electronic equipment

manufacturers which include O2Micro's products due to adverse economic conditions in general or

specifically affecting O2Micro's markets, technical difficulties and delays in the developments process, and

errors in the products. You are also referred to the Form F-1 in connection with the company's initial

public offering in August 2000, Form F-3 in connection with the company's public offering in November

2001, and the annual reports on Form 20-F, which identify important risk factors that could cause actual

results to differ from those contained in the forward-looking statements. The company assumes no

obligation to update or revise any forward-looking information, whether as a result of new information,

future events or otherwise.

Contact Information:

Gary E. Abbott

Director of Investor Relations, O2Micro

Phone: 408.987.5920, x8888

Email: gary.abbott@o2micro.com