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Charge pump drives up to six white LEDs

Posted: 08 Jan 2007 ?? ?Print Version ?Bookmark and Share

Keywords:LED? WLED? Allegro? charge pump? LED driver?

A8434 charge pump IC from Allegro

Allegro has announced the A8434, a new high-efficiency charge pump IC that offers a simple, low-cost white LED (WLED) driver solution for driving up to six WLEDs in various application configurations. All six WLEDs could be backlighting a single display, or used with multiple displays; for example, four WLEDs for a main display and the other two WLEDs backlighting a sub display or a low-current flash/torch.

Using a proprietary control scheme (1x, 1.5x and 2x), the A8434 can deliver well-matched WLED current while maintaining the highest efficiency and low EMI, the company said. The WLED current is regulated over the entire range of Li+ battery voltage to provide uniform intensity. WLED brightness and on/off can be controlled for the six channels, either all together or independently as main display and sub display/torch, through two single-wire serial interface pins.

The A8434 is available in a 16L QFN space-conserving (3-by-3mm footprint) ES package.

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