NATIONAL LP3931 Data Sheet
Summary
The LP3931 is a sophisticated, highly efficient RGB LED driver featuring an integrated high-current boost DC-DC converter designed for portable wireless applications. This chip provides dual sets of fully programmable RGB LEDs, allowing precise control over color, intensity, and advanced blinking patterns via the SPI interface. It enables developers to easily incorporate complex lighting features requiring stable power from single Li-Ion batteries. Ideal for electronics designers building compact devices like cellular phones or specialized displays needing customizable, energy-efficient LED solutions.
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LP3931 Dual RGB LED Driver with High Current Boost DC-DC Converter General Description Features
The LP3931 is RGB LED driver with high current boost High Efficiency Programmable m A Magnetic Boost DC-DC converter designed for portable wireless applica- DC-DC converter tions. It contains sets of RGB LED drivers that are PWM- separately controlled PWM RGB LED drivers with driven with programmable color, intensity and blinking pat- programmable color, brightness, turn on/off slopes and terns. They additionally feature FLASH function to support blinking patterns
picture taking with camera-enabled cellular phones. FLASH function with up to outputs, each up to
An efficient magnetic boost DC/DC converter provides the m A required bias, operating from single Li-Ion battery. The Functions software controlled through SPI interface
DC/DC converter output voltage is user programmable for Additional LED on/off and dimming hardware control adapting to different LED types and for efficiency optimiza-
Programmable low current Standby mode
tion.
Low voltage digital interface down to 1.8V
All functions are software controllable through the SPI inter-
Space efficient 24-pin LLP package
face and internal registers.
Applications GSM Cellular Phones WCDMA, CDMA and CDMA2000 Phones PHS and PDC Cellular Phone
Typical Application
National Semiconductor Corporation DS201173 www.national.com
Page Summary Contents For NATIONAL LP3931 Data Sheet
Manual Details
| Brand | National |
|---|---|
| Pages | 18 |
| File Size | 374.92 KB |
| Published | May 31, 2026 |
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Frequently Asked Questions
How is the LP3931 device primarily controlled?
All functions are software controllable through the SPI interface and internal registers.
Can I customize the LED behavior beyond basic on/off?
Yes, it supports programmable color, intensity, blinking patterns, and smooth turn-on/off slopes. It also has a dedicated FLASH function.
What type of power source is required for operation?
It operates from a single Li-Ion battery and utilizes an efficient magnetic boost DC/DC converter.
Can the output voltage be adjusted by the user?
Yes, the DC/DC converter output voltage is user programmable for optimal bias.