LP3933 Datasheet | National Semiconductor

Description The LP3933 is a plete lighting management system designed for portable wireless applications. It contains a boost DC/DC converter, 4 white-LED drivers to drive the main LCD panel backlight, 2 white-LED drivers for the sub LCD panel and two sets of RGB/FLASH LED drivers. Both backlight drivers have 8-bit constant current drivers that are separately adjustable and matched to 0.5% (typ.). The RGB LED drivers are PWM-driven with programmable color, intensity and blinking patterns. In addition, they feature a FLASH function to support picture taking with cameraenabled cellular phones. An efficient magnetic boost DC/DC converter provides the required bias for LEDs, operating from a single Li-Ion battery. The DC/DC converter output voltage is user programmable from 4.1V to 5.3V for adapting to different LED types and for efficiency optimization. All functions are software controllable through a SPI interface and 19 internal registers. Features n High Efficiency Programmable 300 m A Magnetic Boost DC-DC converter n 2 separately controlled PWM RGB LED drivers with programmable color, brightness, turn on/off slopes and blinking patterns n FLASH function with up to 6 outputs, each up to 120 m A n 4 constant current LED drivers with programmable 8-bit adjustment (0 … 25 m A/LED) n 2 constant current LED drivers with programmable 8-bit adjustment (0 … 25 m A/LED) n Functions software controlled through SPI interface n Additional LED on/off and dimming hardware control n Programmable low current Standby mode n Low voltage digital interface down to 1.8V n Space efficient 32-pin thin CSP laminate package Applications n Cellular Phones n PDAs Typical Application © 2004 National Semiconductor Corporation DS200805 .national. Connection Diagrams and Package Mark Information 32-Lead Thin CSP Package, 4.5 x 5.5 x 0.8 mm, 0.5 mm pitch See NS Package Number SLE32A Package Mark - TOP VIEW Note: The actual physical placement of...