Product details


Number of channels (#) 2 Vin (Min) (V) 2.7 Vin (Max) (V) 5 Vout (Min) (V) 0 Vout (Max) (V) 30 Type Inductive Switching frequency (Max) (kHz) 1100 LED current per channel (mA) 25 Peak efficiency (%) 90 Topology Boost, Current Sink, LDO, Multi-Channel Features Adjustable Switch Frequency, CABC, Enable/Shutdown, I2C Control, OVP, PWM Control, Power Good, Soft Start Operating temperature range (C) -40 to 85 open-in-new Find other Backlight LED drivers

Package | Pins | Size

DSBGA (YFF) 24 0 mm² 2.595 x 1.895 open-in-new Find other Backlight LED drivers


  • Drives up to Two Strings with Maximum of Eight LEDs in Series
    • Integrated Backlight Boost with 29-V Maximum Output Voltage
    • Two Low-Side Constant-Current LED Drivers with 25-mA
      Maximum Output Current
  • Backlight Efficiency Up to 90%
  • 11-Bit Linear or Exponential Dimming with up to 17-Bit Output
  • External PWM Input for CABC Backlight Operation
  • LCD Bias Efficiency > 85%
  • Programmable Positive LCD bias, 4-V to 6-V, 100-mA Maximum
    Output Current
  • Programmable Negative LCD bias, –4-V to –6-V,
    80-mA Maximum Output Current
  • Two Positive Programmable LDO Reference Outputs
    • 4-V to 6-V, 50-mA Maximum Output Current
    • 1.8-V to 3.3-V, 80-mA Maximum Output Current
  • 2.7-V to 5-V Input Voltage Range
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The LM3631 is a complete LCD backlight and bias power solution for mobile devices. This one-chip solution has an integrated high-efficiency backlight LED driver and positive/negative bias supplies for LCD drivers addressing the power requirements of high-definition LCDs. Integrated solution allows small solution size while still maintaining high performance.

Capable of driving up to 16 LEDs, the LM3631 is ideal for small- to medium-size displays. Two additional programmable LDO regulator outputs can be used to power display controller, LCD gamma reference, or any additional peripherals.

A high level of integration and programmability allows the LM3631 to address a variety of applications without the need for hardware changes. Voltage levels, backlight configuration, and power sequences are all configurable through I2C interface.

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Technical documentation

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Type Title Date
* Data sheet LM3631 Complete LCD Backlight and Bias Power datasheet Aug. 21, 2014
White paper Common LED Functions and LED Driver Design Considerations Sep. 21, 2020
Technical article Overcoming challenges for backlight LED drivers in automotive display solutions Jul. 16, 2020
Application note Analog PWM Dimming in White-LED Drivers Dec. 21, 2016
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
User guide Using the LM3631EVM Evaluation Module Aug. 21, 2014

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

The Texas Instruments LM3631 Evaluation Module (EVM) helps designers evaluate the operation and performance of the LM3631 Complete LCD Backlight and Bias Power unit. The LM3631EVM uses the LM3631’s three LDO regulators and an inverting charge pump to provide +-5.6V, 5.5V and 3.3V output (...)

  • LCD Backlight driver with up to 16 white LEDs.
  • Integrated backlight boost converter with adaptive voltage control.
  • LCD positive and negative bias voltage supplies.
  • LDO output for powering display controller.
  • LDO output for powering LCD gamma reference.

Software development

Linux Driver for LM3532
LM3532SW-LINUX The Linux driver supports the LMU(Lighting Management Unit) devices for smartphone handsets. The Linux driver supports communication through the I2C bus and interfaces with various sub-systems.


Linux Mainline Status

Available in Linux Main line: No
Available through (...)

SNVC168.ZIP (141673 KB)

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
DSBGA (YFF) 24 View options

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