Power chip keeps displays on the level

Charge pump DC/DC convertor drives up to five white LEDs for a main display and up to two white LEDs for a subdisplay with regulated constant current for uniform intensity.

New from Texas Instruments, the TPS60250 is a high-efficiency constant-frequency charge pump DC/DC convertor that uses dual-mode conversion to maximise efficiency over the input voltage range.

The tiny 3 x 3mm device provides a fully programmable current with I2C interface for applications, such as cellular phones, PDAs and multiple-display handheld devices.

TI's TPS60250 drives up to five white LEDs for a main display and up to two white LEDs for a subdisplay with regulated constant current for uniform intensity.

By using adaptive charge pump modes and very low-dropout current regulators, the TPS60250 achieves high efficiency over the full one-cell lithium-battery input voltage range.

Four enable inputs, available through I2C, are used for simple on/off controls for the independent displays.

To lower operating current when using one subdisplay LED, the device provides completely separate operation in subdisplay LEDs.

The TPS60250 is shipping in volume production today from TI and its worldwide network of distributors and packaged in a 3 x 3mm, 16-pin QFN packaging.

Suggested resale price starts at US $1.40 in 1000-unit quantities.

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