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LP3943

ACTIVE

16 channel RGB/White LED driver with independent string control via SMBUS/I2C

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LP5018 ACTIVE 18-channel I2C constant-current RGB LED driver Newer device with more outputs, larger current and smaller IQ

Product details

Number of channels 16 LED current per channel (mA) 25 LED configuration Parallel Program memory No Topology Linear 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 (ISD) (typ) (µA) 2 Operating temperature range (°C) -40 to 85 Rating Catalog
Number of channels 16 LED current per channel (mA) 25 LED configuration Parallel Program memory No Topology Linear 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 (ISD) (typ) (µA) 2 Operating temperature range (°C) -40 to 85 Rating Catalog
WQFN (RTW) 24 16 mm² 4 x 4
  • 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
  • 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

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.

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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Technical documentation

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Type Title Date
* Data sheet LP3943 16-Channel RGB, White-LED Driver With Independent SMBUS/I2C String Control datasheet (Rev. D) PDF | HTML 04 Nov 2016
White paper Common LED Functions and LED Driver Design Considerations 21 Sep 2020
Application note How to Select a RGB LED Driver 08 Aug 2019
User guide AN-1300 LP3943 Evaluation Kit (Rev. B) 30 Apr 2013
Application note AN-1715 LP3943/LP3944 as a GPIO Expander (Rev. A) 30 Apr 2013

Design & development

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

Evaluation board

LP3943ISQEV — RGB White Blue 16-LED Fun Light Driver

RGB/White/Blue 16-LED Fun Light Driver

User guide: PDF
Not available on TI.com
Development kit

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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 (...)

User guide: PDF
Not available on TI.com
Driver or library

LP3943SW-LINUX — Linux Driver for LP3943

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 git.ti.com: N/A

Supported Devices:

  • lp3943

 

Linux Source (...)

Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
Package Pins CAD symbols, footprints & 3D models
WQFN (RTW) 24 Ultra Librarian

Ordering & quality

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Information included:
  • Fab location
  • Assembly location

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