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TI buck controllers increase nonisolated performance

Posted: 08 Jun 2004 ?? ?Print Version ?Bookmark and Share

Keywords:texas instruments? ti? dc-dc buck controller? tps40020? tps40021?

Texas Instruments Inc. has introduced two new synchronous dc-dc buck controllers that promise to increase high performance in nonisolated systems with input voltages from 2.25V to 5.5V, and output up to 25A.

According to TI, the TPS40K devices achieve up to 92 percent power efficiency, save board space and simplify power design in industrial, telecom, datacom, wireless basestations and server applications.

The TPS40020 and TPS40021 single-chip controllers minimize diode conduction losses associated with high-side and synchronous rectifier N-channel MOSFET transitions. They combine the company's Predictive Gate Drive technology with an integrated charge pump to enable a regulated 5V gate drive for added performance. The controllers also enhance operation with programmable power supply features such as soft-start and high-side short circuit protection.

The dc-dc buck controllers provide a programmable fixed frequency up to 1MHz and output voltage transient comparators with power good indication to provide fast response time. They are supported by TI's TPS40K Designer software, which includes advanced analysis tools that allow designers to conduct worst-case loop response analysis and component characterization.

Other features of the TPS40020 and TPS40021 include an output voltage as low as 0.7V with one percent internal 0.7V reference, and predictive gate drive n-channel MOSFET drivers. Housed in a 16-pin, HTSSOP PowerPad package, the devices are priced at $1.15 each in quantities of 1,000 units.

The TPS40K Designer software, a TPS40021 evaluation module, and application notes are available from the company website.

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