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LM36274
SNVSAJ9D – FEBRUARY 2016 ...
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LM36274
SNVSAJ9D – FEBRUARY 2016 – REVISED MARCH 2018
Four-Channel LCD Backlight Driver With Integrated Bias Power
1 Features
1 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
2 Applications
LCD Panels With up to 24 LEDs Smart Phones Tablets and Gaming Tablets Home Automation Panels
space space
LLCM VBATT
Simplified Schematic
DSCH LBL
BL_SW BL_SW
CBL_OUT IN BL_OUT
LCM_SW
LED1
SCL SDA PWM HWEN LCM_EN1 LCM_EN2
LM36274
LED2 LED3 LED4
C+ CLCM_OUT VPOS
VNEG
Up to 8 LEDs / String CFLY
CLCM CVPOS CVNEG
BL_GND CP_GND LCM_GND AGND
Copyright © 2017, Texas Instruments Incorporated
3 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 ...
