O2Micro Extends Free Dimming(TM) Technology for the Global LED Retrofit Lighting Market With Two-Step Nightlight Driver

Mon Apr 15, 2013 8:30am EDT

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GEORGE TOWN, Grand Cayman, April 15, 2013 (GLOBE NEWSWIRE) -- O2Micro® International Limited
(Nasdaq:OIIM), a global leader in the design, development and marketing of high-performance
integrated circuits and solutions, today extended the Company's Free Dimming™ technology and
General Lighting product portfolio with the introduction of the OZ2082 LED Driver Controller. It
features two-level toggle dimming, ultra-low nightlight dimming level and Power Factor Correction

O2Micro's patented Free Dimming technology enables LED bulbs to dim using any on/off switch, thus
eliminating cost, installation and compatibility issues associated with traditional incandescent
dimmers. Free Dimming technology works with any on/off switch, including wall toggles, paddle
switches, pull cords, rotary switches and other types of on/off switches commonly found on walls,
extension cords and table/desk lamps.

According to the National Electrical Manufacturers Association (NEMA), there are over 4.4 billion
medium, screw-based light sockets in the U.S. Yet, according to industry estimates, there are only
150 million incandescent dimmers representing an enormous, untapped market opportunity for
O2Micro's Free Dimming technology, which is inherently simple and works with any non-dimming
on/off switch.

About the OZ2082 LED Driver Controller

Similar to O2Micro's broad family of Free Dimming LED driver controllers, the OZ2082 LED Driver
Controller provides analog step dimming using any ordinary non-dimming on/off switch. The OZ2082's
key feature is an ultra-low nightlight dimming level. When turned on, a LED bulb based on the
OZ2082, achieves full brightness instantly. A simple flick of the wall switch dims the bulb to a
deep nightlight level of approximately 0.3% of the full brightness level. The full brightness and
nightlight levels are easily adjustable with a resistor.

The OZ2082 is a highly optimized controller for non-isolated buck converter applications. The
device features the highest level of integration, reducing the system level driver bill of
material (BOM) cost and component count to industry-leading levels. The built-in high voltage
start-up circuit provides fast start-up operation, eliminates the power loss caused by start-up
resistors used in conventional AC/DC converter applications and further reduces the BOM count.

The OZ2082 supports universal 85V to 265V operation, enabling one LED bulb to address the global
marketplace. Integrated power factor correction enables high power factor and low Total Harmonic
Distortion (THD) over a wide input voltage range to meet both residential and commercial
requirements, further helping OEMs meet global regulatory requirements.

High efficiency greater than 88% reduces energy consumption and thermal management complexity.
Integrated over-temperature, over-voltage, cycle-by-cycle current limiting, LED open circuit and
LED short circuit protection and maximum gate drive output clamp provide safe and reliable
operation. Excellent LED current regulation ensures consistent lumen output, regardless of varying
line input conditions.

Product Availability and Additional Information

The OZ2082 is available in a cost effective 8-pin SOP package and is in high volume production
now. Samples and evaluation boards are available now for qualified customers.

For additional information, contact O2Micro sales representatives via our website at

About O2Micro

Founded in April 1995, O2Micro develops and markets innovative power management components for the
Computer, Consumer, Industrial, Automotive and Communications markets. Products include LED
General Lighting, Backlighting, Battery Management and Power Management.

O2Micro International maintains an extensive portfolio of intellectual property with 22,390 patent
claims granted, and over 24,000 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, and combinations thereof are registered trademarks of O2Micro. Free
Dimming and combinations thereof are 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

CONTACT: Scott L. Anderson
         Director of Investor Relations, O2Micro
         Phone: 408.987.5920, x8888
         Email: scott.anderson@o2micro.com