Product details


Number of channels (#) 2 Vin (Min) (V) 2.3 Vin (Max) (V) 5.5 Vout (Min) (V) 12 Vout (Max) (V) 40 Type Inductive Switching frequency (Max) (kHz) 1120 LED current per channel (mA) 28.5 Peak efficiency (%) 87 Topology Boost Features I2C Control, OVP, PWM Control, Soft Start, Thermal Shutdown Operating temperature range (C) -40 to 85 open-in-new Find other Backlight LED drivers

Package | Pins | Size

DSBGA (YFQ) 12 0 mm² 1.43 x 1.95 open-in-new Find other Backlight LED drivers


  • Drives up to 2 Strings of 10 Series LEDs
  • Wide 2.3-V to 5.5-V Input Voltage Range
  • Up to 87% Efficient
  • 8-bit I2C-Compatible Programmable Exponential or Linear Brightness Control
  • PWM Brightness Control for CABC Operation
  • Independent Current Control per String
  • True Shutdown Isolation for LEDs
  • Internal Soft-Start Limits Inrush Current
  • Adaptive Headroom
  • Programmable 16-V/24-V/32-V/40-V Overvoltage Protection
  • Selectable Boost Frequency of 500 kHz or 1 MHz with Optionally Additional Offset
  • Low Profile 12-Pin DSBGA Package
  • Solution Size 32 mm²
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The LM3630A is a current-mode boost converter which supplies the power and controls the current in up to two strings of 10 LEDs per string. Programming is done over an I2C-compatible interface. The maximum LED current is adjustable from 5 mA to 28.5 mA. At any given maximum LED current the LED brightness is further adjusted with 256 exponential or linear dimming steps. Additionally, pulsed width modulation (PWM) brightness control can be enabled allowing for LED current adjustment by a logic level PWM signal.

The boost switching frequency is programmable at 500 kHz for low switching loss performance or 1 MHz to allow the use of tiny low-profile inductors. A setting for a 10% offset of these frequencies is available. Overvoltage protection is programmable at 16 V,
24 V, 32 V, or 40 V to accommodate a wide variety of LED configurations and Schottky diode/output capacitor combinations.

The device operates over a 2.3-V to 5.5-V operating voltage range and –40°C to +85°C ambient temperature range. The LM3630A is available in an ultra-small 12-bump DSBGA package.

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 LM3630A High-Efficiency Dual-String White LED Driver datasheet (Rev. B) Oct. 27, 2015
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
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

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 LM3630EVM is a current mode boost converter 2which supplies the power and USB interface control for two strings of 10 LEDs per string. Max LED current is adjustable from 5 mA to 28.5 mA additional LED brightness further adjustable with 256 exponential or linear dimming steps.
  • Two String White LED driver
  • White LEDs included on board
  • Software Graphical User Interface
  • Includes USB to I2C interface

Software development

Linux Driver for LM3630A
LM3630ASW-LINUX The Linux driver supports the LM3630A White LED Driver. The Linux driver supports communication through the I2C bus and interfaces with the backlight sub-system.


Linux Mainline Status

Available in Linux Main line: Yes
Available through N/A

Supported Devices:

  • lm3630a


Linux Source Files

The files (...)

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
  • (...)

Reference designs

Smart lighting & backlight control by ambient light & noise-immune proximity sensor reference design
TIDA-00754 The TIDA-00754 TI Design demonstrates a proximity sensor implementation for HMI applications. The design can be used for backlight control that dynamically adjusts LCD backlight brightness relative to the environment's ambient light levels. A capacitive proximity sensor saves power and increases the (...)
document-generic Schematic document-generic User guide
Backlight and Smart Lighting Control by Ambient Light and Proximity Sensor Reference Design
TIDA-00373 This system conserves power and extends backlight life by dynamically adjusting the backlight brightness relative to the environment's ambient light.  A capacitive proximity sensor wakes up the system when a user is close to save even more power.


Watch related videos about Sensing NOW.

document-generic Schematic document-generic User guide
Capacitive-Based Human Proximity Detection for System Wake-Up & Interrupt Reference Design
TIDA-00220 This TI Design uses Texas Instruments' capacitive-to-digital converter technology to provide a high-precision method to wake up systems when human interaction occurs. TIDA-00220 demonstrates techniques for alternative sensor design, environmental compensation, and electromagnetic interference (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
DSBGA (YFQ) 12 View options

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