VIN

FB

COMP

VCC

OUT

RT

UVLO

GND

CS

SS

LM3430

VDHC

NC

LM3430

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SNVS472B – JANUARY 2007 – REVISED MAY 2013

Boost Controller for LED Backlighting

Check for Samples: LM3430

1

FEATURES

DESCRIPTION

The LM3430 is a high voltage low-side N-channel

2

•

Internal 40V Startup Regulator

MOSFET controller. Ideal for use in a boost regulator,

•

1A Peak MOSFET Gate Driver

the LM3430 can power the LED backlight in LCD

•

panels, such as in notebook PCs. It contains all of the

features needed to implement single ended primary

•

Duty Cycle Limit in Excess of 90%

topologies. Output voltage regulation is based on

•

Programmable UVLO with Hysteresis

current-mode control, which eases the design of loop

•

Cycle-by-Cycle Current Limit

compensation while providing inherent input voltage

feed-forward.

The

LM3430

includes

a

start-up

•

External Synchronizable (AC-coupled)

regulator that operates over a wide input range of 6V

•

Single Resistor Oscillator Frequency Set

to 40V. The PWM controller is designed for high

•

Slope Compensation

speed capability including an oscillator frequency

range up to 2 MHz and total propagation delays less

•

Adjustable Soft-start

than 100 ns. Additional features include an error

•

WSON-12 (3mm x 3mm)

amplifier,

precision

reference,

line

under-voltage

lockout,

cycle-by-cycle

current

limit,

slope

APPLICATIONS

compensation,

soft-start,

external

synchronization

•

LED Backlight Driver (companion to LM3432)

capability and thermal shutdown. The LM3430 is

available in the WSON-12 package.

•

Boost Converter

•

SEPIC Converter

Typical Application

1

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2007–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.