O2Micro Receives Patent for Power Source Detection Topology

Thu Dec 20, 2012 8:30am EST

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GEORGE TOWN, Grand Cayman, Dec. 20, 2012 (GLOBE NEWSWIRE) -- O2Micro® International Limited
(Nasdaq:OIIM), a global leader in the design, development and marketing of high-performance
integrated circuits and solutions, today announced that it was issued 17 claims under United
States patent number 8,242,742 for its Power Source Detection chargers, systems and methods.

This invention, as part of a charger IC, compares a detection voltage to a predetermined reference
voltage to identify whether the power source is a USB host or an AC adapter.

"This topology enables an intelligent charger to adjust the charging current to the power source.
Higher powered sources will result in faster charging times," said Bill Densham, strategic
marketing director, O2Micro.

About O2Micro

Founded in April 1995, O2Micro develops and markets innovative power management and e-commerce
components for the Computer, Consumer, Industrial, and Communications markets. Products include
Intelligent Lighting, Battery Management, and Power Management.

O2Micro International maintains an extensive portfolio of intellectual property with 21,475 patent
claims granted, and over 22,000 more pending. The company maintains offices worldwide. Additional
company and product information can be found on the company website at www.o2micro.com
http://www.globenewswire.com/newsroom/ctr?d=10016282&l=6&a=www.o2micro.com&u=http%3A%2F%2Fwww.o2micro.com%2F
.

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O2Micro, the O2Micro logo, and combinations thereof are registered trademarks of O2Micro. All
other trademarks or registered 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: Scott L. Anderson
         Director of Investor Relations, O2Micro
         Phone: 408.987.5920, x8888
         Email: scott.anderson@o2micro.com
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