NATIONAL SEMICONDUCTOR LP3933 User's Guide
Summary
Boost your portable electronics with this advanced LP3933 Lighting Management System. This highly efficient, programmable DC-DC converter provides comprehensive control for multiple white and RGB LEDs, making it perfect for wireless devices like PDAs or guided lighting displays. The detailed manual serves as a full technical guide, covering all electrical specifications, connection diagrams, operating parameters, and setup instructions needed to achieve precise color mixing, dimming, and flash functions in demanding applications.
Page 1 Text Content
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LP3933 Lighting Management System for Six White LEDs and Two RGB or FLASH LEDs General Description Features
The LP3933 is complete lighting management system High Efficiency Programmable m A Magnetic Boost designed for portable wireless applications. It contains DC-DC converter boost DC/DC converter, white-LED drivers to drive the separately controlled PWM RGB LED drivers with main LCD panel backlight, white-LED drivers for the sub- programmable color, brightness, turn on/off slopes and LCD panel and two sets of RGB/FLASH LED drivers. blinking patterns Both backlight drivers have 8-bit constant current drivers that FLASH function with up to outputs, each up to are separately adjustable and matched to 0.5% (typ.). The m A RGB LED drivers are PWM-driven with programmable color, constant current LED drivers with programmable 8-bit intensity and blinking patterns. In addition, they feature adjustment (0 m A/LED)
FLASH function to support picture taking with camera- constant current LED drivers with programmable 8-bit enabled cellular phones. adjustment (0 m A/LED)
An efficient magnetic boost DC/DC converter provides the Functions software controlled through SPI interface
required bias for LEDs, operating from single Li-Ion bat- Additional LED on/off and dimming hardware control tery. The DC/DC converter output voltage is user program-
Programmable low current Standby mode
mable from 4.1V to 5.3V for adapting to different LED types
Low voltage digital interface down to 1.8V
and for efficiency optimization. All functions are software
Space efficient 32-pin thin CSP laminate package
controllable through SPI interface and internal registers.
Applications Cellular Phones PDAs
Typical Application
National Semiconductor Corporation DS200805 www.national.com
Page Summary Contents For NATIONAL SEMICONDUCTOR LP3933 User's Guide
Manual Details
| Brand | National |
|---|---|
| Pages | 18 |
| File Size | 406.19 KB |
| Published | June 02, 2026 |
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Frequently Asked Questions
How are the LED outputs controlled?
The lights are PWM-driven and controlled separately via an SPI interface with programmable color, brightness, and blinking patterns.
What power source can operate this system?
The LP3933 is designed to operate efficiently from a single Li-Ion battery, accommodating 4.1V to 5.3V.
Can the device support camera flash photography?
Yes, it features a dedicated FLASH function with an adjustable current (0...25 mA/LED) for picture taking applications.
What physical interface is used for control?
The system uses a space-efficient 32-pin thin CSP laminate package and is fully controllable through an SPI interface.