Worcester, Mass.—Allegro's A8434 touts a proprietary high-efficiency, low-EMI charge pump design, which provides a well regulated output for driving up to six white LEDs.
The charge pump, using a 1x, 1.5x, 2x control scheme, is suited for virtually any white-LED configuration; typically, it's used for driving four LEDs in a main display and for two LEDs that backlight a sub display or a low-current flash/torch. The chip, with a total current capacity of 320 mA, provides a regulated output current over a lithium-ion battery's entire range to provide uniform intensity. Users have control over LED brightness and on/off, either together or independently as main display and sub display/torch, via two single-wire serial interface pins.
Click here to access the product datasheet. The A8434, in a 3-by-3 mm 16-pin QFN package, is priced at 59 cents in 1k quantities. Lead time is 10-12 weeks.
Allegro Microsystems, 1-508-853-5000, www.allegromicro.com