LM36272 Backlight Driver Datasheet

LM36272 Datasheet, PDF, Equivalent


Part Number

LM36272

Description

Two-Channel LCD Backlight Driver

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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LM36272
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LM36272
SNVSAJ7D – FEBRUARY 2016 – REVISED MARCH 2018
LM36272 Two-Channel LCD Backlight Driver With Integrated Bias Power
1 Features
1 Drives up to Two 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 16 LEDs
• Smart Phones
• Tablets and Gaming Tablets
• Home Automation Panels
space
space
Simplified Schematic
DSCH
LBL
CBL_OUT
LLCM
VBATT
IN BL_OUT
LCM_SW
SCL
LED1
LED2
SDA
PWM
LM36272
C+
C-
Up to 8 LEDs / String
CFLY
HWEN
LCM_EN1
LCM_EN2
LCM_OUT
VPOS
VNEG
CLCM
CVPOS
CVNEG
Copyright © 2017, Texas Instruments Incorporated
3 Description
The LM36272 is an integrated two-channel WLED
driver and LCD bias supply. The ultra-compact size,
high efficiency, high level of integration, and
programmability allow the LM36272 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 two
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)
LM36272
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, 2P8S
95
90
85
80
75
70
65
60
VIN = 2.7 V
55 VIN = 3.7 V
VIN = 5 V
50
0 5 10 15 20 25 30 35 40 45 50 55 60
Load (mA)
D051
1
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.

LM36272
LM36272
SNVSAJ7D – FEBRUARY 2016 – REVISED MARCH 2018
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 5
6.1 Absolute Maximum Ratings ...................................... 5
6.2 ESD Ratings.............................................................. 5
6.3 Recommended Operating Conditions....................... 5
6.4 Thermal Information ................................................. 5
6.5 Electrical Characteristics .......................................... 6
6.6 I2C Timing Requirements (Fast Mode) .................... 9
6.7 Typical Characteristics ............................................ 10
7 Detailed Description ............................................ 15
7.1 Overview ................................................................. 15
7.2 Functional Block Diagram ....................................... 16
7.3 Features Description ............................................... 16
7.4 Device Functional Modes........................................ 32
7.5 Programming........................................................... 33
7.6 Register Maps ......................................................... 37
8 Application and Implementation ........................ 47
8.1 Application Information............................................ 47
8.2 Typical Application .................................................. 47
9 Power Supply Recommendations...................... 63
10 Layout................................................................... 63
10.1 Layout Guidelines ................................................ 63
10.2 Layout Example ................................................... 64
11 Device and Documentation Support ................. 65
11.1 Device Support...................................................... 65
11.2 Documentation Support ........................................ 65
11.3 Receiving Notification of Documentation Updates 65
11.4 Community Resources.......................................... 65
11.5 Trademarks ........................................................... 65
11.6 Electrostatic Discharge Caution ............................ 65
11.7 Glossary ................................................................ 65
12 Mechanical, Packaging, and Orderable
Information ........................................................... 66
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision C (June 2017) to Revision D
Page
• Added added silicon rev A1 to revision register. ................................................................................................................. 37
Changes from Revision B (March 2017) to Revision C
Page
• Changed First public release of full data sheet to WEB ........................................................................................................ 1
Changes from Revision A (January 2017) to Revision B
Page
• Changed row(s) in Abs Max table: BL_SW from 30 V to 35 V, BL_OUT and current sink inputs (LEDX) remain at 30 V ... 5
Changes from Original (February 2016) to Revision A
Page
• Changed "Orderable Device" suffix on POA from "YFRR" to "YFFR" ................................................................................... 1
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Product Folder Links: LM36272
Copyright © 2016–2018, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity LM36272 SNVSAJ7D – FEBRUARY 2 016 – REVISED MARCH 2018 LM36272 Two- Channel LCD Backlight Driver With Integ rated Bias Power 1 Features •1 Drive s up to Two Parallel White LED Strings (29-V Maximum VOUT) • 11-Bit Exponent ial and Linear Dimming Control • PWM and I2C Brightness Control • Backligh t Operation With 4.7-µH to 15-µH Indu ctor • Backlight and LCD Bias Efficie ncy 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 A 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 16 LEDs • Smar t Phones • Tablets and Gaming Tablets • Home Automation Panels space space Simplified Schematic DSCH LBL CBL_OU T BL_SW BL_SW LLCM VBATT IN BL_OUT LCM_SW SCL LED1 LED2 SDA PWM LM36272 C+ C- Up to 8 LEDs / String CFLY HWEN LCM_EN1 LCM_EN2 L.
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