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Texas Instruments has introduced two dual-output, step-down dc/dc converters with a unique one-pin serial interface technology that enables simple digital-voltage scaling. Since these are converters are 95% efficient, they help to extend battery.

The TPS62400 synchronous, dual-channel switching converter, with integrated FET technology, provides up to 400 mAof output current at the first output and up to 600 mA at the second output over an input voltage range of 2.5 V to 6 V. The converter features TI's one-pin EasyScale serial interface that enables the device to adjust the output voltage dynamically during operation. This also means that the TPS62400 can support dynamic voltage scaling when powering TI's TMS320C5000 digital signal processors and OMAP processors.

In addition to the TPS62400, TI has introduced the TPS62420 dual step-down converter that delivers up to 600 mA at the first output and up to 1 ampere at the second output. Both devices operate in a power-save mode at light-load currents and can be placed in a shutdown mode that reduces the power consumption to less than 1.2 microamperes.

Both devices are housed in small, 10-pin, 3 mm x 3 mm QFN packages, and because of their 2.25 MHz fixed frequency operation, designers can employ small inductors and capacitors to perform filtering and bypassing roles.
Other features of the TPS62400/420 include a typical quiescent current of 32 microamperes and a 1% output voltage accuracy in PWM mode.
The TPS62400 and TPS62420 are currently in volume production; they are priced at $2.70 in 1000-piece quantities.