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LM36274 데이터시트(PDF) 1 Page - Texas Instruments

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부품명 LM36274
상세설명  Integrated Backlight Driver With Integrated LCD Bias
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제조업체  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
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LM36274 데이터시트(HTML) 1 Page - Texas Instruments

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IN
HWEN
LM36274
SCL
SDA
C+
C-
VNEG
VPOS
LED1
LED2
BL_OUT
LED3
LCM_OUT
LCM_SW
PWM
LCM_EN1
LCM_EN2
LED4
CFLY
LBL
VBATT
Up to 8 LEDs / String
CBL_OUT
CLCM
CVPOS
CVNEG
LLCM
DSCH
Load (mA)
0
10
20
30
40
50
60
70
80
90 100 110 120
50
55
60
65
70
75
80
85
90
95
D053
VIN = 2.7 V
VIN = 3.7 V
VIN = 5 V
Product
Folder
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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
LM36274
SNVSAC0A – FEBRUARY 2016 – REVISED FEBRUARY 2016
LM36274 Integrated Backlight Driver With Integrated LCD Bias
1
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
Simplified Schematic
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 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.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (MAX)
LM36274
DSBGA (24)
2.44 mm × 1.67 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Backlight Efficiency, 4P6S


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