O2Micro Receives Selector Circuit Architecture Patent

April 20, 2009. O2Micro® International Limited (NASDAQ®: OIIM; SEHK: 0457), a leading supplier of innovative power management and security components, was issued 21 claims under United States patent number 7,489,110 for its Selector Circuit for Power Management in multiple battery systems; a continuation of the invention issued March 2006 under United States patent number 7,009,364.

O2Micro's Selector Circuit power management architecture, used with multiple battery systems, permits the selection of a power source among multiple battery sources, and enables verification of power conditions and override instructions from an electronic devices power management unit.

"This power source selection technique allows parallel operation of two or more batteries and enhances power supply safety and battery life in the power supply block of various electronic applications, such as notebook computers," stated Dr. Alex Hartular, vice president, O2Micro.


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


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