LM3407

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SNVS553B – JANUARY 2008 – REVISED MAY 2013

350 mA, Constant Current Output Floating Buck Switching Converter for High Power

LEDs

Check for Samples: LM3407

1

FEATURES

DESCRIPTION

The LM3407 is a constant current output floating

2

•

Input operating range 4.5V to 30V

buck

switching

converter

designed

to

provide

•

constant current to high power LEDs. The device is

•

Accurate constant current output

ideal for automotive, industrial and general lighting

applications. The LM3407 has an integrated power N-

•

Independent device enable (CMOS compatible)

MOSFET that makes the application solution compact

and PWM dimming control

and simple to implement. An external 1% thick-film

•

Converter switching frequency adjustable from

resistor allows the converter output voltage to adjust

300 kHz to 1 MHz

as needed to deliver constant current within 10%

•

No external control loop compensation

accuracy to a serially connected LED string of varying

number and type. Converter switching frequency is

required

adjustable from 300 kHz to 1 MHz. The LM3407

•

Supports ceramic and low ESR output

features a dimming input to enable LED brightness

capacitors

control

by

Pulse

Width

Modulation

(PWM).

•

Input Under Voltage Lock Out (UVLO)

Additionally, a separate enable pin allows for low

power

shutdown.

An

exposed

pad

MSOP-8

•

Thermal shutdown protection

PowerPAD

package

provides

excellent

heat

•

MSOP-8 PowerPAD Package

dissipation and thermal performance. Input UVLO

and output open-circuit protection ensure a robust

APPLICATIONS

LED driver solution.

•

LED Driver

•

Constant Current Source

•

Automotive Lighting

•

General Illumination

•

Industrial Lighting

TYPICAL APPLICATION

1

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2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2008–2013, 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.