LM3631 Bias Power Datasheet

LM3631 Datasheet, PDF, Equivalent


Part Number

LM3631

Description

Complete LCD Backlight and Bias Power

Manufacture

etcTI

Total Page 30 Pages
Datasheet
Download LM3631 Datasheet


LM3631
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LM3631 Complete LCD Backlight and Bias Power
LM3631
SNVS834 – AUGUST 2014
1 Features
1 Drives up to Two Strings with Maximum of Eight
LEDs in Series
– Integrated Backlight Boost with 29-V Maximum
Output Voltage
– Two Low-Side Constant-Current LED Drivers
with 25-mA Maximum Output Current
• Backlight Efficiency Up to 90%
• 11-Bit Linear or Exponential Dimming with up to
17-Bit Output Resolution
• External PWM Input for CABC Backlight
Operation
• LCD Bias Efficiency > 85%
• Programmable Positive LCD bias, 4-V to 6-V,
100-mA Maximum Output Current
• Programmable Negative LCD bias, –4-V to –6-V,
80-mA Maximum Output Current
• Two Positive Programmable LDO Reference
Outputs
– 4-V to 6-V, 50-mA Maximum Output Current
– 1.8-V to 3.3-V, 80-mA Maximum Output
Current
• 2.7-V to 5-V Input Voltage Range
2 Applications
Mobile Device LCD Backlighting and Bias
3 Description
The LM3631 is a complete LCD backlight and bias
power solution for mobile devices. This one-chip
solution has an integrated high-efficiency backlight
LED driver and positive/negative bias supplies for
LCD drivers addressing the power requirements of
high-definition LCDs. Integrated solution allows small
solution size while still maintaining high performance.
Capable of driving up to 16 LEDs, the LM3631 is
ideal for small- to medium-size displays. Two
additional programmable LDO regulator outputs can
be used to power display controller, LCD gamma
reference, or any additional peripherals.
A high level of integration and programmability allows
the LM3631 to address a variety of applications
without the need for hardware changes. Voltage
levels, backlight configuration, and power sequences
are all configurable through I2C interface.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (MAX)
LM3631
DSBGA (24)
2.585 mm x 1.885 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
+
- VIN
Simplified Schematic
LSW
D1
CIN
LBST
CIN
Up to 8 LEDs / string
COUT
VIN SW VOUT LED1
BST_SW
LED2
SDA
C2
SCL
nRST
LM3631
C1
BST_OUT
LCD_EN
CP_VNEG
PWM
LDO_OREF
OTP_SEL
LDO_VPOS
FLAG
LDO_CONT
GND_BST_SW
AGND
GND_SW
PGND
CFLY
VNEG (-5.4V)
VOREF (+4.0V to +6.0V)
VPOS (+5.4V)
VCONT (+1.8V)
CCONT CVPOS COREF CNEG CBST
Backlight Efficiency, 2P6S
95
90
85
80
75
70
65
60
VIN 2.7V
55 VIN 3.7V
VIN 5.0V
50
0 5 10 15 20 25 30 35 40 45 50
Load (mA)
D007
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.

LM3631
LM3631
SNVS834 – AUGUST 2014
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 3
6 Pin Configuration and Functions ......................... 4
7 Specifications......................................................... 5
7.1 Absolute Maximum Ratings ...................................... 5
7.2 Handling Ratings ...................................................... 5
7.3 Recommended Operating Conditions....................... 5
7.4 Thermal Information ................................................. 6
7.5 Electrical Characteristics .......................................... 6
7.6 I2C Timing Requirements (SDA, SCL) .................. 10
7.7 Typical Characteristics ............................................ 11
8 Detailed Description ............................................ 17
8.1 Overview ................................................................. 17
8.2 Functional Block Diagram ....................................... 19
8.3 Features Description ............................................... 20
8.4 Device Functional Modes........................................ 34
8.5 Programming........................................................... 36
8.6 Register Maps ......................................................... 40
9 Application and Implementation ........................ 46
9.1 Application Information............................................ 46
9.2 Typical Application .................................................. 46
10 Power Supply Recommendations ..................... 49
11 Layout................................................................... 49
11.1 Layout Guidelines ................................................ 49
11.2 Layout Example ................................................... 50
12 Device and Documentation Support ................. 51
12.1 Device Support...................................................... 51
12.2 Trademarks ........................................................... 51
12.3 Electrostatic Discharge Caution ............................ 51
12.4 Glossary ................................................................ 51
13 Mechanical, Packaging, and Orderable
Information ........................................................... 51
4 Revision History
DATE
August 2014
REVISION
*
NOTES
Initial release.
2 Submit Documentation Feedback
Product Folder Links: LM3631
Copyright © 2014, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3631 Complete LCD Backligh t and Bias Power LM3631 SNVS834 – AU GUST 2014 1 Features •1 Drives up to Two Strings with Maximum of Eight LEDs in Series – Integrated Backlight Boo st with 29-V Maximum Output Voltage – Two Low-Side Constant-Current LED Driv ers with 25-mA Maximum Output Current Backlight Efficiency Up to 90% • 1 1-Bit Linear or Exponential Dimming wit h up to 17-Bit Output Resolution • Ex ternal PWM Input for CABC Backlight Ope ration • LCD Bias Efficiency > 85% Programmable Positive LCD bias, 4-V t o 6-V, 100-mA Maximum Output Current Programmable Negative LCD bias, –4- V to –6-V, 80-mA Maximum Output Curre nt • Two Positive Programmable LDO Re ference Outputs – 4-V to 6-V, 50-mA M aximum Output Current – 1.8-V to 3.3- V, 80-mA Maximum Output Current • 2.7 -V to 5-V Input Voltage Range 2 Applic ations Mobile Device LCD Backlighting and Bias 3 Description The LM3631 is a complete LCD back.
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