LM36274 Integrated Backlight Driver With LCD Bias | TI.com

LM36274 (ACTIVE)

Integrated Backlight Driver With LCD Bias

 

Description

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.

Features

  • 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

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Parametrics

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Part number Order Channels (#) Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Switching frequency (Max) (kHz) Type LED current per channel (mA) LED (#) Topology Shutdown current (Typ) (uA) Peak efficiency (%) LED configuration Function Features Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
LM36274 Order now 4     2.7     5     27     30     1050     Inductive     30     32     Boost
Current Sink    
1.2     92     Parallel
Series    
  Adjustable Switch Frequency
CABC
I2C Control
OVP
Thermal Shutdown    
-40 to 85     DSBGA | 24     See datasheet (DSBGA)    
LM36923H Order now 3     2.5     5.5     0     37     1050     Inductive     30     30     Boost
Current Sink
Multi-Channel    
1.2     92     Parallel
Series    
  Adjustable Switch Frequency
CABC
Direct PWM Dimming
Enable/Shutdown
I2C Control
OVP
Thermal Shutdown    
-40 to 85     DSBGA | 12     See datasheet (DSBGA)    
LP8555 Order now 12     2.7     20     7     28     1000     Inductive     50     96     Boost     3     93     6 LED channels
Dual
Parallel    
Backlight     Adjustable Switch Frequency
Analog/PWM Mixed Dimming
CABC
Edge Rate Control
I2C Control
Integrated Switch
OVP
PWM Control
Thermal Shutdown    
-40 to 85     DSBGA | 36     See datasheet (DSBGA)    
LP8557 Order now 6     2.7     5.5     7     28     1000     Inductive     25     48     Boost     0.001     93     6 LED channels
Parallel    
  CABC
Edge Rate Control    
-30 to 85     DSBGA | 16     See datasheet (DSBGA)    
TPS61176 Order now 6     2.7     6.5     2.7     38     1000     Inductive     35     60     Boost     2     90     6 LED channels