LP3931 Datasheet, PDF (1/17 Pages) National Semiconductor (TI) – Dual RGB LED Driver with High Current Boost DC-DC Converter

August 2004
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 applica-
tions. It contains 2 sets of RGB LED drivers that are PWM-
driven with programmable color, intensity and blinking pat-
terns. 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 optimiza-
tion.
All functions are software controllable through the SPI inter-
face 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
© 2004 National Semiconductor Corporation DS201173
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