LM36923 LED Driver Datasheet

LM36923 Datasheet, PDF, Equivalent


Part Number

LM36923

Description

White LED Driver

Manufacture

etcTI

Total Page 30 Pages
Datasheet
Download LM36923 Datasheet


LM36923
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LM36923
SNVSA30A – MARCH 2015 – REVISED OCTOBER 2016
LM36923 Highly Efficient Triple-String White LED Driver
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 Three 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 LM36923 is an ultra-compact, highly efficient,
threestring 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)
LM36923
DSBGA (12)
1.755 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
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.

LM36923
LM36923
SNVSA30A – MARCH 2015 – 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........................................................... 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...................... 37
9.1 Input Supply Bypassing .......................................... 37
10 Layout................................................................... 37
10.1 Layout Guidelines ................................................. 37
10.2 Layout Example .................................................... 40
11 Device and Documentation Support ................. 41
11.1 Device Support...................................................... 41
11.2 Receiving Notification of Documentation Updates 41
11.3 Community Resources.......................................... 41
11.4 Trademarks ........................................................... 41
11.5 Electrostatic Discharge Caution ............................ 41
11.6 Glossary ................................................................ 41
12 Mechanical, Packaging, and Orderable
Information ........................................................... 41
4 Revision History
Changes from Original (March 2015) to Revision A
Page
• Changed pin name "VOUT" to "OUT" .................................................................................................................................... 3
• Changed pin name in Layout Example from 'VOUT' to 'OUT' ............................................................................................. 39
2 Submit Documentation Feedback
Product Folder Links: LM36923
Copyright © 2015–2016, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM36923 SNVSA30A – MARCH 2 015 – REVISED OCTOBER 2016 LM36923 Hi ghly Efficient Triple-String White LED Driver 1 Features •1 1% Matched Curr ent Sinks Across (Process, Voltage, Tem p) • 3% Current Sink Accuracy Across (Process, Voltage, Temp) • 11-Bit Dim ming Resolution • Up to 91.6% Solutio n Efficiency • Drives from One to Thr ee Parallel LED Strings at up to 28 V PWM Dimming Input • I2C Programmab le • Selectable 500-kHz and 1-MHz Swi tching Frequency with Optional –12% s hift • Auto Switch Frequency Mode (25 0 kHz, 500 kHz, 1 MHz) • Four Configu rable Overvoltage Protection Thresholds (17 V, 21 V, 25 V, 29 V) • Four Conf igurable Overcurrent Protection Thresho lds (750 mA, 1000 mA, 1250 mA, 1500 mA) • Thermal Shutdown Protection 2 Appl ications Power Source for Smart Phone a nd Tablet Backlighting 3 Description T he LM36923 is an ultra-compact, highly efficient, threestring white-LED driver designed for L.
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