LM36273 Backlight Driver Datasheet

LM36273 Datasheet, PDF, Equivalent


Part Number

LM36273

Description

Three-Channel LCD Backlight Driver

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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LM36273
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LM36273
SNVSAJ8D – FEBRUARY 2016 – REVISED MARCH 2018
LM36273 Three-Channel LCD Backlight Driver With Integrated Bias Power
1 Features
1 Drives up to Three 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
DSCH
LBL
IN BL_OUT
CBL_OUT
LLCM
VBATT
LCM_SW
SCL
SDA
LM36273
PWM
HWEN
LED1
LED2
LED3
C+
C-
Up to 8 LEDs / String
CFLY
LCM_EN1
LCM_EN2
LCM_OUT
VPOS
VNEG
CLCM
CVPOS
CVNEG
Copyright © 2017, Texas Instruments Incorporated
3 Description
The LM36273 is an integrated three-channel WLED
driver and LCD bias supply. The ultra-compact size,
high efficiency, high level of integration, and
programmability allow the LM36273 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 three
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)
LM36273
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, 3P7S
95
90
85
80
75
70
65
60
VIN = 2.7 V
55 VIN = 3.7 V
VIN = 5 V
50
0 10 20 30 40 50 60 70 80 90
Load (mA)
D052
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.

LM36273
LM36273
SNVSAJ8D – 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...................... 69
10 Layout................................................................... 69
10.1 Layout Guidelines ................................................ 69
10.2 Layout Example ................................................... 70
11 Device and Documentation Support ................. 71
11.1 Device Support...................................................... 71
11.2 Documentation Support ........................................ 71
11.3 Receiving Notification of Documentation Updates 71
11.4 Community Resources.......................................... 71
11.5 Trademarks ........................................................... 71
11.6 Electrostatic Discharge Caution ............................ 71
11.7 Glossary ................................................................ 71
12 Mechanical, Packaging, and Orderable
Information ........................................................... 72
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: LM36273
Copyright © 2016–2018, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity LM36273 SNVSAJ8D – FEBRUARY 2 016 – REVISED MARCH 2018 LM36273 Thre e-Channel LCD Backlight Driver With Int egrated Bias Power 1 Features •1 Dri ves up to Three Parallel White LED Stri ngs (29-V Maximum VOUT) • 11-Bit Expo nential and Linear Dimming Control • PWM and I2C Brightness Control • Back light Operation With 4.7-µH to 15-µH Inductor • Backlight and LCD Bias Eff iciency up to 92% • Programmable LCD Bias Voltages (±4 V to ±6.5 V With 50 -mV resolution) With Up to 80-mA per Ou tput • 0.2% Matched LED Current From 60 µA to 30 mA • 1% Accurate LED Cur rent 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 Tab lets • Home Automation Panels space s pace Simplified Schematic DSCH LBL IN BL_OUT CBL_OUT BL_SW BL_SW LLCM VBAT T LCM_SW SCL SDA LM36273 PWM HWEN LED1 LED2 LED3 C+ C- Up to 8 LEDs / String CFLY LCM_EN1 LCM_E.
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