LP3931 Datasheet | National Semiconductor

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 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 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 © 2004 National Semiconductor Corporation DS201173 .national. Connection Diagrams and Package Mark Information 24-Lead LLP Package, 4 x 4 x 0.8 mm NS Package Number NSQAL024 .. Bottom View Top View Package Mark - Top View Note: The actual physical placement of the package marking will vary from part to part. The package marking “XY” designates the date code. “UZ” and “TT” are NSC internal codes for die manufacturing and assembly traceability. Both will vary considerably. Ordering Information Order Number LP3931ISQ LP3931ISQX Package Marking LP3931ISQ LP3931ISQ Supplied As 1000 units, Tape-and-Reel 2500 units, Tape-and-Reel .national. Pin...