Lighting Management System For Six White LEDs And Two RGB Or FLASH LEDs
The LP3933 is a complete 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 camera-enabled 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
By National Semiconductor Corporation
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