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LM36274

ACTIVE

Integrated backlight driver with LCD Bias

Product details

Number of channels 4 Vin (min) (V) 2.7 Vin (max) (V) 5 Vout (min) (V) 27 Vout (max) (V) 30 Type Inductive Switching frequency (max) (kHz) 1050 Duty cycle (max) (%) 92 LED current per channel (mA) 30 Peak efficiency (%) 92 Topology Boost, Current Sink Features Adjustable Switch Frequency, CABC, I2C control, OVP, Thermal shutdown Operating temperature range (°C) -40 to 85 Rating Catalog
Number of channels 4 Vin (min) (V) 2.7 Vin (max) (V) 5 Vout (min) (V) 27 Vout (max) (V) 30 Type Inductive Switching frequency (max) (kHz) 1050 Duty cycle (max) (%) 92 LED current per channel (mA) 30 Peak efficiency (%) 92 Topology Boost, Current Sink Features Adjustable Switch Frequency, CABC, I2C control, OVP, Thermal shutdown Operating temperature range (°C) -40 to 85 Rating Catalog
DSBGA (YFF) 24 4.67999999999999928 mm² 1.8 x 2.5999999999999996
  • Drives up to Four Parallel White LED Strings
    (29-V Maximum VOUT)
  • 11-Bit Exponential and Linear Dimming Control
  • PWM and I2C Brightness Control
  • Backlight Operation With 4.7-µH to 15-µH Inductor
  • Backlight and LCD Bias Efficiency up to 92%
  • Programmable LCD Bias Voltages (±4 V to ±6.5 V With 50-mV resolution) With Up to 80-mA per Output
  • 0.2% Matched LED Current From 60 µA to 30 mA
  • 1% Accurate LED Current From 60 µA to 30 mA
  • 2.7-V to 5-V Input Voltage Range
  • Drives up to Four Parallel White LED Strings
    (29-V Maximum VOUT)
  • 11-Bit Exponential and Linear Dimming Control
  • PWM and I2C Brightness Control
  • Backlight Operation With 4.7-µH to 15-µH Inductor
  • Backlight and LCD Bias Efficiency up to 92%
  • Programmable LCD Bias Voltages (±4 V to ±6.5 V With 50-mV resolution) With Up to 80-mA per Output
  • 0.2% Matched LED Current From 60 µA to 30 mA
  • 1% Accurate LED Current From 60 µA to 30 mA
  • 2.7-V to 5-V Input Voltage Range

The LM36274 is an integrated four-channel WLED driver and LCD bias supply. The ultra-compact size, high efficiency, high level of integration, and programmability allow the LM36274 to address a variety of applications without the need for hardware changes while minimizing the overall solution area.

The backlight boost provides the power to bias four parallel LED strings with up to 29-V total output voltage. The 11-bit LED current is programmable via the I2C bus and/or controlled via a logic level PWM input from 60 µA to 30 mA. Each LED string can be independently enabled or disabled to provide zone dimming capabilities. The backlight boost can be operated efficiently with an inductance range from 4.7 µH to 15 µH, allowing for efficiency and solution size optimization.

The LCD bias boost provides the power to both a positive LDO and an inverting charge pump. Both positive and negative bias supplies have programmable output voltages of ±4 V to ±6.5 V with 50-mV steps and up to ±80 mA of current capability. An auto-sequencing feature provides a programmed delay from positive to negative bias activation, with additional programmable voltage slew rate control. Two wake-up modes allow both bias outputs to be controlled with a single external signal and stay active while consuming very low quiescent current.

The LM36274 is an integrated four-channel WLED driver and LCD bias supply. The ultra-compact size, high efficiency, high level of integration, and programmability allow the LM36274 to address a variety of applications without the need for hardware changes while minimizing the overall solution area.

The backlight boost provides the power to bias four parallel LED strings with up to 29-V total output voltage. The 11-bit LED current is programmable via the I2C bus and/or controlled via a logic level PWM input from 60 µA to 30 mA. Each LED string can be independently enabled or disabled to provide zone dimming capabilities. The backlight boost can be operated efficiently with an inductance range from 4.7 µH to 15 µH, allowing for efficiency and solution size optimization.

The LCD bias boost provides the power to both a positive LDO and an inverting charge pump. Both positive and negative bias supplies have programmable output voltages of ±4 V to ±6.5 V with 50-mV steps and up to ±80 mA of current capability. An auto-sequencing feature provides a programmed delay from positive to negative bias activation, with additional programmable voltage slew rate control. Two wake-up modes allow both bias outputs to be controlled with a single external signal and stay active while consuming very low quiescent current.

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Technical documentation

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Type Title Date
* Data sheet Four-Channel LCD Backlight Driver With Integrated Bias Power datasheet (Rev. D) PDF | HTML 02 Mar 2018
White paper Common LED Functions and LED Driver Design Considerations 21 Sep 2020
Application note How to Use LM3627x to Design DPU in Smartphones 07 May 2020
Application note LM3627x Layout Guidelines 12 Oct 2017
Application note Analog PWM Dimming in White-LED Drivers 21 Dec 2016
Application note Inductor Selection in Boost Converters for LCD Backlight Applications 24 Oct 2016
Application note Auto-Frequency Mode Setting for Improved Boost Efficiency in White LED Backlight 14 Oct 2016
Application note Schottky Diode Selection in Asynchronous Boost Converters 06 Sep 2016
EVM User's guide Using the LM36274EVM Evaluation Module 08 Feb 2016

Design & development

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Evaluation board

LM36274EVM — LM36274 Regulated Charge Pump Inverter Evaluation Module

The LM36274EVM aids in evaluation of the LM36274 integrated LED driver and LCD bias supply. The backlight boost provides the power to bias four parallel LED strings with up to 29-V total output voltage and up to 30 mA/string. The 11-bit LED current is programmable via the I2C bus and/or controlled (...)
User guide: PDF
Not available on TI.com
GUI for evaluation module (EVM)

SNVC194 LM36274EVM GUI 1.0.0

Supported products & hardware

Supported products & hardware

Products
Backlight LED drivers
LM36272 Two-channel LCD backlight and Bias power LM36273 Three-channel LCD backlight and Bias power LM36274 Integrated backlight driver with LCD Bias
Hardware development
Evaluation board
LM36274EVM LM36274 Regulated Charge Pump Inverter Evaluation Module
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 CAD symbols, footprints & 3D models
DSBGA (YFF) 24 Ultra Librarian

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