O2Micro Extends Free Dimming(TM) Technology for the Global LED Lighting Market With New Isolated Step-Dimming Driver

OZ8027A LED Driver Controller Dims Using Any On/Off Switch and Provides Primary-Side-Control and Power Factor Correction

GEORGE TOWN, Grand Cayman, Sept. 17, 2012 --

O2Micro(R) 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(TM) technology and
Lighting product portfolio with the introduction of the OZ8027A.

O2Micro's patented Free Dimming technology enables LED bulbs to dim using
any on/off switch, thus eliminating cost, installation and compatibility
problems 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 OZ8027A LED Driver Controller

Similar to O2Micro's OZ8022A, OZ8022B and OZ8022M Free Dimming LED driver
controllers, the OZ8027A LED Driver Controller provides three-step dimming
using any ordinary non-dimming on/off switch.
However, while the OZ8022 product family supports non-isolated applications,
the OZ8027A features an isolated flyback topology to help support UL
regulatory requirements.

The OZ8027A features low BOM-count and uses primary-side regulation to
eliminate the need for an expensive optocoupler. The OZ8027A also features
power factor correction, achieving high power factor over a wide input
voltage range and very low THD to meet various regulatory requirements. The
built-in high voltage startup circuit provides fast startup operation and
reduces the BOM count. The device is also compatible with neon indicators
commonly found in wall switches.

The OZ8027A supports universal 85V to 265V operation, enabling one LED bulb
to address the global marketplace. High efficiency greater than 85% 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 provides safe and reliable
operation. Excellent LED current regulation ensures consistent lumen output,
regardless of varying line input conditions.

Product Availability and Additional Information

The OZ8027A 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 www.o2micro.com.

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 20,690 patent claims granted, and over 21,000 more pending.
The company maintains offices worldwide. Additional company and product
information can be found on the company website at www.o2micro.com.

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