NATIONAL SEMICONDUCTOR LP3933 Manual

Update: 30 September, 2023

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 bat- tery. The DC/DC converter output voltage is user program- mable 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.

Brand: National

File format: PDF

Size: 407 KB

MD5 Checksum: BA3AF684AA7F05D358192A1FD0BE9B45

Publication date: 03 May, 2012

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