LP3931

August 2004 www.DataSheet4U.com LP3931 Dual RGB LED Driver with High Current Boost DC-DC Converter LP3931 Dual RGB LED Driver with High Current Boost DC-DC Converter General Description The LP3931 is a RGB LED driver with high current boost DC-DC converter designed for portable wireless applications. It contains 2 sets of RGB LED drivers that are PWMdriven with programmable color, intensity and blinking patterns. They additionally feature a FLASH function to support picture taking with camera-enabled cellular phones. An efficient magnetic boost DC/DC 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 the SPI interface and internal registers. Features n High Efficiency Programmable 300 mA 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 mA 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 24-pin LLP package Applications n GSM Cellular Phones n WCDMA, CDMA and CDMA2000 Phones n PHS and PDC Cellular Phone Typical Application 20117301 © 2004 National Semiconducto...