GENERAL DESCRIPTION

The ADM8843 uses charge pump technology to provide the power to drive up to four LEDs. The LEDs are used for backlighting a color LCD display that has regulated constant current for uniform brightness intensity. The main display can use up to three LEDs, and the sub display uses one LED. The CTRL1 and CTRL2 digital input control pins control the shutdown operation and the brightness of the main and sub displays.

FEATURES

Drives 4 LEDs from a 2.6 V to 5.5 V (Li-Ion) input supply

1×/1.5×/2× fractional charge pump to maximize

power efficiency

0.3 typical LED current matching

Up to 88 power efficiency over Li-Ion range

Powers main and sub display LEDs with individual shutdown

Package footprint only 9 mm2 (3 mm × 3 mm)

Package height only 0.75 mm

Low power shutdown mode

Shutdown function

Soft start limiting in-rush current

APPLICATIONS

Cellular phones with main and sub displays

White LED backlighting

Camera flash/strobes and movie light applications

Micro TFT color displays

DSC

PDAs