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Tiny 400mA DC/DC ups battery life in handhelds

Posted: 27 Mar 2008 ?? ?Print Version ?Bookmark and Share

Keywords:step-down converter? DSP? MCU?


Texas Instruments Inc. has introduced a space-saving, 400mA step-down converter for portable designs. The 95-percent efficient converter extends battery life in mobile phones, portable navigation systems and low-power DSP and MCU applications.

TI's TPS62270 synchronous DC/DC converter efficiently regulates output voltages down to 0.9V with 1.5 percent accuracy, enabling the device to power TI's C5000 DSPs, low-power MSP430 MCUs and controllers with ultraprecise processor core supply requirements. The switcher's voltage select (Vsel) pin gives designers the ability to switch between two fixed voltage levels to customize and cut power consumption in the processor core through dynamic voltage scaling.

The TPS62270 provides up to 400mA of output current, and can be powered by a single-cell Li-ion battery with an input voltage range of 2-6V. The converter automatically enters a power save mode during light load operating conditions, consuming only 15?A of quiescent current. For low-noise applications, the device can be forced into fixed frequency pulse width modulation (PWM) mode by pulling the MODE pin high. In the shutdown mode, the TPS62270's current consumption is reduced to less than 1?A.

The new converter expands TI's TPS622x family introduced in 2007. TPS62240 supports output currents up to 300mA; the TPS62260 supports up to 600mA; and the TPS62290 supports up to 1A. TI offers a full range of evaluation modules and application notes. Gerber files of the evaluation modules are also available through

The TPS62270 comes in a 6-pin, 2mm x 2mm x 0.8mm SON package, and is shipping in volume today. Suggested retail pricing for the TPS62270 is $1.05 in 1,000-piece quantities.

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