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Features
High Efficiency Programmable 300 mA Magnetic Boost DC-DC converter
2 separately controlled PWM RGB LED drivers with programmable color, brightness, turn on/off slopes and blinking patterns
FLASH function with up to 6 outputs, each up to 120 mA
4 constant current LED drivers with programmable 8-bit adjustment (0 ... 25 mA/LED)
2 constant current LED drivers with programmable 8-bit adjustment (0 ... 25 mA/LED)
Functions software controlled through SPI interface
Additional LED on/off and dimming hardware control
Programmable low current Standby mode
Low voltage digital interface down to 1.8V
Space efficient 32-pin thin CSP laminate package
Description The LP3933 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 the sub-LCD panel and two sets of RGB/FLASH LED drivers.
Both backlight drivers have 8-bit constant current drivers that are separately adjustable and matched to 0.5% (typ.). 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 camera-enabled cellular phones.
An efficient magnetic boost DC/DC converter provides the required bias for LEDs, operating from a single Li-Ion battery. The DC/DC converter output voltage is user programmable from 4.1V to 5.3V for adapting to different LED types and for efficiency optimization. All functions are software controllable through a SPI interface and 19 internal registers.
Applications
Cellular Phones
PDAs
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