Product details


Channels (#) 16 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 Peak efficiency (%) 100 Operating temperature range (C) -40 to 85 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


  • Internal Power-On Reset
  • Active Low Reset
  • Internal Precision Oscillator
  • Variable Dim Rates
    (From 6.25 ms to 1.6 s; 160 Hz to 0.625 Hz)
  • 16 LED Drivers (Multiple Programmable States: ON, OFF, Input, and Dimming at a Specified Rate)
  • 16 Open-Drain Outputs Capable of Driving up to 25 mA per LED
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The LP3943 is an integrated device capable of independently driving 16 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 LP3943 contains the ability to dim LEDs in SMBUS/I2C applications where it is required, to cut down on bus traffic.

Traditionally, dimming LEDs using a serial shift register such as 74LS594/5 requires a large amount of traffic on the serial bus. The LP3943 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 to an ON or OFF state, 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.

For all available packages, see the orderable addendum at the end of the data sheet.
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LP3944 ACTIVE RGB/White/Blue 8-LED Fun Light driver This product is a 9-channel, 12-bit PWM I2C RGB LED drivers with ultra-low quiescent current.

Technical documentation

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Type Title Date
* Datasheet LP3943 16-Channel RGB, White-LED Driver With Independent SMBUS/I2C String Control datasheet (Rev. D) Nov. 04, 2016
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-1300 LP3943 Evaluation Kit (Rev. B) Apr. 30, 2013
Application note AN-1715 LP3943/LP3944 as a GPIO Expander (Rev. A) Apr. 30, 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide

RGB/White/Blue 16-LED Fun Light Driver

  • The LP3943 is an integrated device capable of independently driving 16 LEDs.
  • This device 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 (...)
document-generic User guide

The BOOSTXL-CAPKEYPAD is an easy-to-use evaluation module (EVM) for the MSP430FR2522 capacitive touch sensing microcontroller (MCU) with  CapTIvate™ technology. The BOOSTXL-CAPKEYPAD can be used in three different ways - with a LaunchPad™ development kit, with the CapTIvate (...)

  • MSP430FR2522 MSP430 MCU with CapTIvate technology
  • 40-pin BoosterPack standard leveraging the LaunchPad ecosystem
  • CapTIvate programming header for interfacing with CAPTIVATE-PGMR
  • 12 touch button numeric keypad with proximity sensor
  • Integrated LP3943 LED driver for backlighting

Software development

Linux Driver for LP3943
LP3943SW-LINUX The Linux driver supports the LP3943 16-LED Fun Light Driver. The Linux driver supports communication through the I2C bus and interfaces with the GPIO and PWM sub-systems.


Linux Mainline Status

Available in Linux Main line: Yes
Available through N/A

Supported Devices:

  • lp3943


Linux Source Files (...)

Design tools & simulation

PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

CAD/CAE symbols

Package Pins Download
WQFN (RTW) 24 View options

Ordering & quality

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  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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