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Tiny 400-mA low-power DC/DC converter for portable designs from Texas Instruments

18th March 2008

ES Admin

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Texas Instruments 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 microcontroller applications. TI’s TPS62270 synchronous DC/DC converter efficiently regulates output voltages down to 0.9 V with ±1.5 percent accuracy, enabling the device to power TI’s newest C5000 DSPs, low-power MSP430 microcontrollers and controllers with ultra-precise 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 400 mA of output current, and can be powered by a single-cell lithium-ion battery with an input voltage range of 2.0 V to 6 V. The converter automatically enters a power save mode during light load operating conditions, consuming only 15-uA 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 uA. 2.25-MHz DC/DC converters for any portable design

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