LM36923H LED Driver Datasheet

LM36923H Datasheet, PDF, Equivalent


Part Number

LM36923H

Description

White LED Driver

Manufacture

etcTI

Total Page 30 Pages
Datasheet
Download LM36923H Datasheet


LM36923H
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LM36923H
SNVSAF3B – FEBRUARY 2016 – REVISED OCTOBER 2016
LM36923H Highly Efficient Triple-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 Three 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 LM36923H is an ultra-compact, highly efficient,
three-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)
LM36923H
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
SW OUT
IN
LM36923H
HWEN
SDA
SCL
ASEL
PWM GND
LED1
LED2
LED3
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.

LM36923H
LM36923H
SNVSAF3B – FEBRUARY 2016 – REVISED OCTOBER 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...................... 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 Receiving Notification of Documentation Updates 39
11.4 Community Resources.......................................... 39
11.5 Electrostatic Discharge Caution ............................ 39
11.6 Glossary ................................................................ 39
12 Mechanical, Packaging, and Orderable
Information ........................................................... 39
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (February 2016) to Revision B
Page
• Changed pin name "OVP" to "OUT" in page 1 Typ App ....................................................................................................... 1
• Changed from "VOUT" to "OUT" on page 3 connection diagram ......................................................................................... 3
• Changed pin name on FBD from "OVP" to "OUT" .............................................................................................................. 10
Changes from Original (February 2016) to Revision A
Page
• Changed device from product preview to production ............................................................................................................ 1
2 Submit Documentation Feedback
Product Folder Links: LM36923H
Copyright © 2016, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM36923H SNVSAF3B – FEBRUA RY 2016 – REVISED OCTOBER 2016 LM3692 3H Highly Efficient Triple-String White LED Driver 1 Features •1 1% Matched Current Sinks Across Process, Voltage, Temperature • 3% Current-Sink Accura cy Across Process, Voltage, Temperature • 11-Bit Dimming Resolution • Up t o 90% Solution Efficiency • Drives fr om One to Three 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 Configurab le Overcurrent Protection Thresholds (7 50 mA, 1000 mA, 1250 mA, 1500 mA) • T hermal Shutdown Protection • External ly Selectable I2C Address Options via A SEL Input 2 Applications • Power Source for Smart Phone and Tablet Backlighting • LCD Panels Wi.
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