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National rolls two new converters

Posted: 08 Sep 2005 ?? ?Print Version ?Bookmark and Share

Keywords:national semiconductor? converter? lm2716? lm2717?

Converters extend battery lifeNational Semiconductor Corp. introduced two new high-performance converters that promise to increase efficiency and extend battery life in high-current applications. The LM2716 buck-boost and LM2717 buck-buck converters each feature greater than 90 percent efficiency over a wide load range for extended battery life in embedded computer systems, STBs, portable Internet access devices, general point-of-load architectures, and monitors and televisions, including TFT/LCD flat-panel displays.

Both converters are suitable for applications where multiple high-current, low-voltage power supplies are needed to power system loads, including FPGAs, DSPs and digital ASICs. "The use of distributed power architectures with adjustable output voltages has become increasingly popular for powering digital ASICs and DSPs," said Yoon Paek, marketing director for National's portable power products group. "Our new buck-boost and buck-buck converters provide exceptionally flexible and high-performance solutions for these point-of-load architectures."

The LM2716 is composed of two PWM DC/DC converters. A buck (step-down) converter is used to generate a fixed output voltage, while a boost (step-up) converter is used to generate an adjustable output voltage. The LM2717 is composed of two PWM DC/DC buck converters.

Both the LM2716 and LM2717 feature low RDSon (0.16 ohm and 0.12 ohm) internal switches for maximum efficiency. Operating frequency can be adjusted between 300kHz and 600kHz, allowing the use of small external components. These two converters are packaged in a low profile, 24-pin TSSOP. For 1,000-unit orders, the LM2716 is priced at $2.40 and the LM2717 at $2.45. Pb-free package options are also available.

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