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LM3631

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Integrated WLED backlight driver and Bias power for LCD panels

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Data sheet

LM3631

ACTIVE
Data sheet Order now

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 Duty cycle (max) (%) 94 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 Rating Catalog
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 Duty cycle (max) (%) 94 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 Rating Catalog
DSBGA (YFF) 24 4.67999999999999928 mm² 1.8 x 2.5999999999999996
  • 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
    Resolution
  • 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
  • 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
    Resolution
  • 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

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.

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 PDF | HTML 21 Aug 2014
White paper Common LED Functions and LED Driver Design Considerations 21 Sep 2020
Application note Analog PWM Dimming in White-LED Drivers 21 Dec 2016
EVM User's guide Using the LM3631EVM Evaluation Module 21 Aug 2014

Design & development

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

Evaluation board

LM3631EVM — LM3631EVM Complete LCD Backlight and Bias Power Evaluation Module

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 (...)

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

LM3532SW-LINUX — Linux Driver for LM3532

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 git.ti.com: (...)

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GUI for evaluation module (EVM)

SNVC168 — LM3631EVM Software

Supported products & hardware

Supported products & hardware

Products
Backlight LED drivers
LM3631 — Integrated WLED backlight driver and Bias power for LCD panels
Hardware development
Evaluation board
LM3631EVM — LM3631EVM Complete LCD Backlight and Bias Power Evaluation Module
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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 (...)
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DSBGA (YFF) 24 Ultra Librarian
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