GND

DIM

BOOT

SW

VOUT

RON

LM3406/06HV

VIN,VINS

D1

L1

VCC

CS

COMP

LM3406, LM3406HV

www.ti.com

SNVS512C – SEPTEMBER 2008 – REVISED FEBRUARY 2010

LM3406/06HV 1.5A Constant Current Buck Regulator for Driving High Power LEDs

Check for Samples: LM3406, LM3406HV

1

FEATURES

DESCRIPTION

The

LM3406/06HV

are

monolithic

switching

2

•

Integrated 2.0A MOSFET

regulators designed to deliver constant currents to

•

high power LEDs. Ideal for automotive, industrial, and

•

general lighting applications, they contain a high-side

N-channel MOSFET switch with a current limit of

•

True Average Output Current Control

2.0A

(typical)

for

step-down

(Buck)

regulators.

•

1.7A Minimum Output Current Limit Over

Controlled on-time with true average current and an

Temperature

external current sense resistor allow the converter

•

Cycle-by-Cycle Current Limit

output voltage to adjust as needed to deliver a

constant

current

to

series

and

series-parallel

•

PWM Dimming with Dedicated Logic Input

connected LED arrays of varying number and type.

•

PWM Dimming with Power Input Voltage

LED dimming via pulse width modulation (PWM) is

•

Simple Control Loop Compensation

achieved using a dedicated logic pin or by PWM of

the power input voltage. The product feature set is

•

Low Power Shutdown

rounded out with low-power shutdown and thermal

•

Supports All-Ceramic Output Capacitors and

shutdown protection.

Capacitor-less Outputs

•

Thermal Shutdown Protection

•

TSSOP-14 Package

APPLICATIONS

•

LED Driver

•

Constant Current Source

•

Automotive Lighting

•

General Illumination

•

Industrial Lighting

TYPICAL APPLICATION

1

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

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008–2010, 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.