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Product details

Parameters

Number of channels (#) 8 LED current per channel (mA) 25 LED configuration Parallel Program memory No Programmable ramp control No Vin (Min) (V) 2.3 Vin (Max) (V) 5.5 Iout (Max) (A) 0.2 Features I2C Control Iq (Typ) (mA) 0.35 Shutdown current (Typ) (uA) 2 Operating temperature range (C) -40 to 85 Rating Catalog open-in-new Find other RGB LED drivers

Package | Pins | Size

WQFN (RTW) 24 16 mm² 4 x 4 open-in-new Find other RGB LED drivers

Features

  • Internal Power-on Reset
  • Active Low Reset
  • Internal Precision Oscillator
  • Variable Dim Rates (from 6.25 ms to 1.6s; 160 Hz–0.625 Hz)

Key Specifications

  • 8 LED Driver (Multiple Programmable States—On, Off, Input, and Dimming at a Specified Rate)
  • 8 Open Drain Outputs Capable of Driving up to 25 mA per LED

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Description

LP3944 is an integrated device capable of independently driving 8 LEDs. This device also contains an internal precision oscillator that provides all the necessary timing required for driving each LED. Two prescaler registers along with two PWM registers provide a versatile duty cycle control. The LP3944 contains the ability to dim LEDs in SMBUS/I2C applications where it is required to cut down on bus traffic.

Traditionally, to dim LEDs using a serial shift register such as 74LS594/5 would require a large amount of traffic to be on the serial bus. LP3944 instead requires only the setup of the frequency and duty cycle for each output pin. From then on, only a single command from the host is required to turn each individual open drain output ON, OFF, or to cycle a programmed frequency and duty cycle. Maximum output sink current is 25 mA per pin and 200 mA per package. Any ports not used for controlling the LEDs can be used for general purpose input/output expansion.

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Technical documentation

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Type Title Date
* Data sheet LP3944 RGB/White/Blue 8-LED Fun Light Driver datasheet (Rev. A) Apr. 06, 2013
White paper Common LED Functions and LED Driver Design Considerations Sep. 21, 2020
Application note How to Select a RGB LED Driver Aug. 08, 2019
Technical article Here's how body electronics and lighting technology are changing the driving experience Sep. 26, 2016
Technical article LED brightness adjustment: high-frequency PWM dimming Aug. 26, 2016
Technical article Take better selfies with innovative LED flashes Nov. 18, 2014
Technical article Solving the automotive EMI issues in new cars with all the screens Sep. 11, 2014
User guide AN-1344 LP3944 Evaluation Kit (Rev. B) Apr. 30, 2013
Application note AN-1715 LP3943/LP3944 as a GPIO Expander (Rev. A) Apr. 30, 2013

Design & development

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Software development

DRIVER OR LIBRARY Download
Linux Driver for LP3944
LP3944SW-LINUX The Linux driver supports the LP3944 8-LED Fun Light Driver. The Linux driver supports communication through the I2C bus and interfaces with the LED sub-system.

 

Linux Mainline Status

Available in Linux Main line: Yes
Available through git.ti.com: N/A

Supported Devices:

  • lp3944

 

Linux Source Files

The files (...)

Design tools & simulation

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CAD/CAE symbols

Package Pins Download
WQFN (RTW) 24 View options

Ordering & quality

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