LP3936

LP3936 Lighting Management System for Six White LEDs and One RGB or FLASH LED June 2004 LP3936 Lighting Management System for Six White LEDs and One RGB or FLASH LED General Description LP3936 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 sub-LCD panel and 1 set of RGB LED drivers. Both WLED groups have 8-bit programmable constant current drivers that are separately adjustable and matched to 1% (typ.). For efficient backlighting the backlight intensity can be adjusted using the 8-bit ADC with ambient light detection circuit. 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 converter provides the required bias operating from a single Li-Ion battery. The DC/DC converter output voltage is user programmable for adapting to different LED types and for efficiency optimization. All functions are software controllable through an I2C and MicroWire/SPI compatible interface and 16 internal registers. Features n High Efficiency 250 mA Magnetic Boost DC-DC Converter with Programmable Output Voltage n PWM controlled RGB LED drivers with programmable color, brightness, turn on/off slopes and blinking n FLASH function with 3 drivers, each up to 120 mA curren...