Home Power management LED drivers RGB LED drivers

LP3944

ACTIVE

RGB/White/Blue 8-LED Fun Light driver

A newer version of this product is available

open-in-new Compare alternates
Similar functionality to the compared device
LP5009 ACTIVE 9-channel I2C constant-current RGB LED driver Newer device with more outputs, larger current and smaller IQ

Product details

Number of channels 8 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 8 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 1.6s; 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

All trademarks are the property of their respective owners.

  • 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

All trademarks are the property of their respective owners.

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.

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.

Download View video with transcript Video

Similar products you might be interested in

open-in-new Compare alternates
Similar functionality to the compared device
LP3943 ACTIVE 16 channel RGB/White LED driver with independent string control via SMBUS/I2C This product is a 3 string backlight driver with 11-bits of exponential dimming.

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 5
Type Title Date
* Data sheet LP3944 RGB/White/Blue 8-LED Fun Light Driver datasheet (Rev. A) 06 Apr 2013
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-1344 LP3944 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.

Driver or library

LP3944SW-LINUX — Linux Driver for LP3944

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 (...)

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 Download
WQFN (RTW) 24 View options

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos