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LM3632A
  • LM3632A

LM3632A

ACTIVE

Single-chip backlight with Bias power and 1.5-A flash LED driver Linux Mainline Status

Texas Instruments LM3632A Product Info

1 April 2026 2

Parameters

Number of channels

2

Vin (min) (V)

2.7

Vin (max) (V)

5.5

Vout (min) (V)

0

Vout (max) (V)

29.5

Type

Inductive

Switching frequency (max) (kHz)

1100

Duty cycle (max) (%)

94

LED current per channel (mA)

25

Peak efficiency (%)

92

Topology

Boost, Current Sink, Multi-Channel

Features

Adjustable Switch Frequency, CABC, Direct PWM Dimming, Enable/Shutdown, I2C control, Integrated Switch, OVP, PWM control, Soft Start

Operating temperature range (°C)

-40 to 85

Rating

Catalog

Package

DSBGA (YFF)-30-5.71999999999999912 mm² 2.2 x 2.5999999999999996

Features

  • Drives up to Two Strings of Typically 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 Exponential or Linear Dimming
  • External PWM Input for CABC Backlight
    Operation
  • LCD Bias Efficiency > 85%
  • Programmable Positive LCD bias, 4-V to 6-V, 50-
    mA Maximum Output Current
  • Programmable Negative LCD bias, –4-V to –6-V,
    50-mA Maximum Output Current
  • 1.5-A Flash LED Boost
  • Flash Efficiency > 85%
  • 2.7-V to 5-V Input Voltage Range
  • Drives up to Two Strings of Typically 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 Exponential or Linear Dimming
  • External PWM Input for CABC Backlight
    Operation
  • LCD Bias Efficiency > 85%
  • Programmable Positive LCD bias, 4-V to 6-V, 50-
    mA Maximum Output Current
  • Programmable Negative LCD bias, –4-V to –6-V,
    50-mA Maximum Output Current
  • 1.5-A Flash LED Boost
  • Flash Efficiency > 85%
  • 2.7-V to 5-V Input Voltage Range

Description

The LM3632A integrates the WLED drivers for both the backlight of the LCD panel and the camera flash along with the bias power for the LCD panel into one device. The device has all the safety features required in LED drivers with up to 90% efficiency and bias positive/negative power rails achieving 1.5% accuracy. Capable of driving up to 16 backlight LEDs, the device is ideal for small- to medium-size displays. A 1.5-A constant-current LED driver powered by a synchronous boost converter can be used for flash applications. The high-side flash current source allows for grounded cathode LED operation.

A high level of integration and programmability allows the LM3632A to address a variety of applications without the need for hardware changes.

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