O2Micro Receives Patent for Battery Cell Balancing Methodology

May 7, 2009. O2Micro® International Limited (NASDAQ®: OIIM; SEHK: 0457), a leading supplier of innovative power management and security components, was issued 26 claims under United States patent number 7,466,104 for its Battery Pack Multiple Cell Balancing system/method.

This invention provides a system and approach for balancing battery cells during charging. Unlike conventional cell balancing methods, the patented invention has a real time bleeding scheme when an unbalanced condition is detected, called Battery Bleeding-on-Demand?technology. It also has the flexibility to adjust for different kinds of batteries.

"We are excited about this patent grant as it addresses battery cell balancing needs in growing multiple cell applications (such as, Power tool, E-Bike, LEV and EV/HEV) in a cost effective manner, which is of primary concern to customers in today抯 global economy," commented William Kao, 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.lxhbw.com.

O2Micro, the O2Micro logo, SmartCardBus, Bleeding-on朌emand, 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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