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, having 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 0.9 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