LP3936 Datasheet | National Semiconductor

Description LP3936 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 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 Micro Wire/SPI patible interface and 16 internal registers. Features n High Efficiency 250 m A 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 m A current n 4 constant current White LED drivers with programmable 8-bit adjustment (0 … 25 m A/LED) n 2 constant current White LED drivers with programmable 8-bit adjustment (0 … 25 m A/LED) n 8-bit ADC for ambient light sensor with averaging n bined Micro Wire/SPI and I2C patible serial interface n Low current Standby mode (software controlled) 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 DS200814 .national. Connection Diagrams and Package Mark Information 32-Lead Thin CSP Package, 4.5 x 5.5 x 0.8 mm, 0.5 mm...