LM36922H LED Driver Datasheet

LM36922H Datasheet, PDF, Equivalent


Part Number

LM36922H

Description

Highly Efficient Dual-String White LED Driver

Manufacture

etcTI

Total Page 30 Pages
Datasheet
Download LM36922H Datasheet


LM36922H
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LM36922H
SNVSAF2A – FEBRUARY 2016 – REVISED FEBRUARY 2016
LM36922H Highly Efficient Dual-String White LED Driver
1 Features
1 1% Matched Current Sinks Across Process,
Voltage, Temperature
• 3% Current-Sink Accuracy Across Process,
Voltage, Temperature
• 11-Bit Dimming Resolution
• Up to 90% Solution Efficiency
• Drives from One to Two Parallel LED Strings at up
to 38 V at 25 mA per String
• PWM Dimming Input
• I2C Programmable
• Selectable 500-kHz and 1-MHz Switching
Frequency With Optional –12% shift
• Auto Switch Frequency Mode (250 kHz, 500 kHz,
1 MHz)
• Four Configurable Overvoltage Protection
Thresholds (17 V, 24 V, 31 V, 38 V)
• Four Configurable Overcurrent Protection
Thresholds (750 mA, 1000 mA, 1250 mA,
1500 mA)
• Thermal Shutdown Protection
• Externally Selectable I2C Address Options via
ASEL Input
2 Applications
• Power Source for Smart Phone and Tablet
Backlighting
• LCD Panels With up to 24 LEDs
3 Description
The LM36922H is an ultra-compact, highly efficient,
two-string white-LED driver designed for LCD display
backlighting. The device can power up to 12 series
LEDs at up to 25 mA per string. An adaptive current
regulation method allows for different LED voltages in
each string while maintaining current regulation.
The LED current is adjusted via an I2C interface or
through a logic level PWM input. The PWM duty cycle
is internally sensed and mapped to an 11-bit current
thus allowing for a wide range of PWM frequencies
with noise-free operation from 50 µA to 25 mA.
Other features include an auto-frequency mode,
which can automatically change the frequency based
on load current in order to optimize efficiency.
The device operates over the 2.5-V to 5.5-V input
voltage range and a –40°C to +85°C temperature
range.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (MAX)
LM36922H
DSBGA (12)
1.756 mm × 1.355 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
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Simplified Schematic
VOUT (Up to 38V)
Typical String-to-String Matching vs LED Current
VBATT
VIO
1
SW OVP
IN
LM36922H
HWEN
SDA
SCL
ASEL
PWM GND
LED1
LED2
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.

LM36922H
LM36922H
SNVSAF2A – FEBRUARY 2016 – REVISED FEBRUARY 2016
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......................................................... 4
6.1 Absolute Maximum Ratings ..................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information ................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 I2C Timing Requirements.......................................... 6
6.7 Typical Characteristics .............................................. 7
7 Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ....................................... 10
7.3 Feature Description................................................. 11
7.4 Device Functional Modes........................................ 16
7.5 Programming........................................................... 24
7.6 Register Maps ........................................................ 25
8 Applications and Implementation ...................... 27
8.1 Application Information............................................ 27
8.2 Typical Application .................................................. 27
9 Power Supply Recommendations...................... 34
9.1 Input Supply Bypassing .......................................... 34
10 Layout................................................................... 34
10.1 Layout Guidelines ................................................. 34
10.2 Layout Example .................................................... 37
11 Device and Documentation Support ................. 38
11.1 Device Support...................................................... 38
11.2 Trademarks ........................................................... 38
11.3 Community Resources.......................................... 38
11.4 Electrostatic Discharge Caution ............................ 38
11.5 Glossary ................................................................ 38
12 Mechanical, Packaging, and Orderable
Information ........................................................... 38
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (February 2016) to Revision A
Page
• Changed device from product preview to production ............................................................................................................ 1
2 Submit Documentation Feedback
Product Folder Links: LM36922H
Copyright © 2016, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM36922H SNVSAF2A – FEBRUA RY 2016 – REVISED FEBRUARY 2016 LM369 22H Highly Efficient Dual-String White LED Driver 1 Features •1 1% Matched Current Sinks Across Process, Voltage, Temperature • 3% Current-Sink Accurac y Across Process, Voltage, Temperature • 11-Bit Dimming Resolution • Up to 90% Solution Efficiency • Drives fro m One to Two Parallel LED Strings at up to 38 V at 25 mA per String • PWM Di mming Input • I2C Programmable • Se lectable 500-kHz and 1-MHz Switching Fr equency With Optional –12% shift • Auto Switch Frequency Mode (250 kHz, 50 0 kHz, 1 MHz) • Four Configurable Ove rvoltage Protection Thresholds (17 V, 2 4 V, 31 V, 38 V) • Four Configurable Overcurrent Protection Thresholds (750 mA, 1000 mA, 1250 mA, 1500 mA) • Ther mal Shutdown Protection • Externally Selectable I2C Address Options via ASEL Input 2 Applications • Power Source for Smart Phone and Tablet Backlighting • LCD Panels With .
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