DESCRIPTION The ADM8845 uses charge pump technology to provide the power required to drive up to six LEDs. The LEDs are used for backlighting a color LCD display, having regulated constant current for uniform brightness intensity. The main display can have up to four LEDs, and the sub display can have one or two LEDs. The digital CTRL1 and CTRL2 input control pins control the shutdown operation and the brightness of the main and sub displays. To maximize power efficiency, the charge pump can operate in a 1 , 1.5 , or 2 mode. The charge pump automatically to maintain sufficient drive for the LED anodes at the highest power efficiency. Improved brightness matching of the LEDs is achieved by a feedback pin to sense individual LED current with a maximum matching accuracy of 1%. FUNCTIONAL BLOCK DIAGRAM CURRENTCONTROL 1CURRENTCONTROL 2CURRENTCONTROL 3CURRENTCONTROL 4CURRENTCONTROL 5CURRENTCONTROL 6CONTROLLOGICVREFCHARGE PUMP1/1.5/2 MODEOSCLEDCURRENTCONTROLCIRCUITFB1CURRENT CONTROLLED SINKSF FEATURES Drives 6 LEDs from 2.6 V to 5.5 V (Li-Ion) input supply 1 /1.5 /2 fractional charge pump to maximize power efficiency 1% max LED current matching Up to 88% power efficiency over Li-Ion range 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 lights Micro TFT color displays DSC PDAs GENERAL DESCRIPTION The ADM8845 uses charge pump technology to provide the power required to drive up to six LEDs. The LEDs are used for backlighting a color LCD display, having regulated constant current for uniform brightness intensity. The main display can have up to four LEDs, and the sub display can have one or two LEDs. The digital CTRL1 and CTRL2 input control pins control the shutdown operation and the brightness of the main and sub displays. To maximize power efficiency, the charge pump ca Specifications subject to change without notic