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National Semiconductor Introduces Integrated Power Management ICs for the TFT LCD Market

First to Market with Boost Converter and Buffers Integrated on One Chip

Dec 16, 2002

December 16, 2002 – National Semiconductor Corp. (NYSE:NSM) today enhanced its position in the burgeoning displays market by introducing three boost converters with integrated buffers that are ideal for generating bias supplies for large-format, thin-film-transistor liquid-crystal displays (TFT LCDs).

Based on National’s successful LM2622 boost converter, the LM2702, LM2710 and LM2711 include the VCOM buffer, Gamma buffers and other circuitry that support soft start, power supply sequencing and other features. This level of integration is an industry first for the notebook PC and flat panel monitor TFT LCD markets. It reduces component count and required board space, allowing manufacturers to develop thinner, lighter panels with larger viewing area.

“National Semiconductor remains committed to developing the best power management technologies for the displays market,” said Yoon Paek, marketing director for National Semiconductor’s Portable Power Systems group. “As a result of our success with the LM2622, we are working closely with all of the top TFT LCD makers to help develop thinner, lighter and larger panels.  These highly integrated boost converters are the initial results of those collaborations.”

The highly efficient current mode PWM boost converter is the core of all three of the new devices.  The LM2702 features two integrated buffers: one VCOM buffer and one Gamma buffer.  The LM2702 operates from an input supply voltage in the 2.2V to 12V range and is available in a TSS0P-16 package.

The LM2710 features five integrated buffers: one VCOM buffer and four Gamma buffers, or, alternately, five Gamma buffers. The LM2711 features four integrated buffers: one VCOM buffer and three Gamma buffers, or, alternately, four Gamma buffers. Both devices operate from an input supply voltage in the 2.2V to 7.5V range and are available in a TSS0P-20 package.

All three devices feature integrated patented soft-start circuitry that limits the startup inrush current of the boost converter without the need for external components. The soft-start circuitry supports tailoring of startup timing via a soft-start pin.

Pricing and Availability
On the market today, the boost converters are affordably priced.  In quantities of 1000 pieces, the LM2702 is $1.40 apiece; the LM2710 is $2.00 apiece; and the LM2711 is $1.80 each.

For more information about these TFT LCD power management ICs, visit National’s World Wide Web site at http://www.national.com/pf/LM/LM2702.html, http://www.national.com/pf/LM/LM2710.html, and http://www.national.com/pf/LM/LM2711.html.

Powering Innovation
National is powering innovation. First in technology, performance and packaging, National supplies world-class power management solutions for large and small-format TFT LCDs and cell phones, personal digital assistants, digital cameras and other handheld, portable electronics.  For more details see power.national.com.

About National Semiconductor
National Semiconductor is the premier analog company driving the information age. Combining real-world analog and state-of-the-art digital technology, the company is focused on the fast growing markets for wireless handsets; displays; information infrastructure, and information appliances. With headquarters in Santa Clara, California, National reported sales of $1.5 billion for its most recent fiscal year and has about 10,000 employees worldwide. Additional company and product information is available on the World Wide Web at www.national.com