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LED2

GND

HWEN

LM36923H

PWM

SDA

SCL

LED3

ASEL

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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

SNVSAF3A – FEBRUARY 2016 – REVISED FEBRUARY 2016

LM36923H Highly Efficient Triple-String White LED Driver

1

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

•

•

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

•

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.

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

Typical String-to-String Matching vs LED Current