LM36922 LED Driver Datasheet

LM36922 Datasheet, PDF, Equivalent


Part Number

LM36922

Description

Highly Efficient Dual-String White LED Driver

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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LM36922
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LM36922 Highly Efficient Dual-String White LED Driver
LM36922
SNVSA29 – MAY 2015
1 Features
1 1% Matched Current Sinks Across (Process,
Voltage, Temp)
• 3% Current Sink Accuracy Across (Process,
Voltage, Temp)
• 11-Bit Dimming Resolution
• Up to 91.6% Solution Efficiency
• Drives from One to Two Parallel LED Strings at up
to 28 V
• 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, 21 V, 25 V, 29 V)
• Four Configurable Overcurrent Protection
Thresholds (750 mA, 1000 mA, 1250 mA, 1500
mA)
• Thermal Shutdown Protection
2 Applications
Power Source for Smart Phone and Tablet
Backlighting
3 Description
The LM36922 is an ultra-compact, highly efficient,
two string white-LED driver designed for LCD display
backlighting. The device can power up to 8 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
and noise-free operation.
The device operates over the 2.5-V to 5.5-V input
voltage range and -40°C to 85°C temperature range.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (MAX)
LM36922
DSBGA (12)
1.755 mm x 1.355 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
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Simplified Schematic
Typical String-to-String Matching vs LED Current
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.

LM36922
LM36922
SNVSA29 – MAY 2015
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........................................................... 25
7.6 Register Maps ........................................................ 26
8 Applications and Implementation ...................... 29
8.1 Application Information............................................ 29
8.2 Typical Application .................................................. 29
9 Power Supply Recommendations...................... 35
9.1 Input Supply Bypassing .......................................... 35
10 Layout................................................................... 35
10.1 Layout Guidelines ................................................. 35
10.2 Layout Example .................................................... 38
11 Device and Documentation Support ................. 39
11.1 Device Support...................................................... 39
11.2 Trademarks ........................................................... 39
11.3 Electrostatic Discharge Caution ............................ 39
11.4 Glossary ................................................................ 39
12 Mechanical, Packaging, and Orderable
Information ........................................................... 39
4 Revision History
Date
May 2015
Revision
*
Notes
Initial release.
2 Submit Documentation Feedback
Product Folder Links: LM36922
Copyright © 2015, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM36922 Highly Efficient Dua l-String White LED Driver LM36922 SNVS A29 – MAY 2015 1 Features •1 1% Ma tched Current Sinks Across (Process, Vo ltage, Temp) • 3% Current Sink Accura cy Across (Process, Voltage, Temp) • 11-Bit Dimming Resolution • Up to 91. 6% Solution Efficiency • Drives from One to Two Parallel LED Strings at up t o 28 V • PWM Dimming Input • I2C Pr ogrammable • 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 Th resholds (17 V, 21 V, 25 V, 29 V) • F our Configurable Overcurrent Protection Thresholds (750 mA, 1000 mA, 1250 mA, 1500 mA) • Thermal Shutdown Protectio n 2 Applications Power Source for Smart Phone and Tablet Backlighting 3 Descr iption The LM36922 is an ultra-compact, highly efficient, two string white-LED driver designed for LCD display backlighting. The d.
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