Linear LED drivers conserve space in portable backlighting apps

Linear LED drivers conserve space in portable backlighting apps

Ideal for backlighting the main LCD displays or keypads in mobile electronics, the FAN5622/24/26 are two-, four-, and six-channel current-sink linear LED drivers, respectively, that reduce overall component count by eliminating additional passive components used in charge pumps and series boost LED drivers. The FAN5624 is available in micro-MLP packaging and is claimed to be nearly 60% smaller than competing solutions, while the FAN5626, packaged in MicroPAKMLP, is nearly 20% smaller.

With a very low dropout voltage of 50 mV, the devices facilitate driving LEDs without an inductor or flyback capacitors. The brightness levels of the LED outputs are programmed through a single-wire control interface. The user can program 32 linear dimming steps and turn on and off the LEDs through this interface by applying digital pulses.

Additional features include a peak efficiency of 92%, an input voltage range of 2.7 to 5.5 V, less than 1 µA shutdown current, and short-circuit, undervoltage, and thermal protection. (Ea/1,000: FAN5622, $0.47, FAN5624, $0.55, FAN5626, $0.63 — samples available now.)

Fairchild Semiconductor , South Portland , ME
Sales 207-775-8100
http://www.fairchildsemi.com