GND

DIM

BOOT

SW

CS

RON

LM3402/02HV

VIN

D1

L1

VCC

LM3402, LM3402HV

www.ti.com

SNVS450E – SEPTEMBER 2006 – REVISED MAY 2013

0.5A Constant Current Buck Regulator for Driving High Power LEDs

Check for Samples: LM3402, LM3402HV

1

FEATURES

DESCRIPTION

The

LM3402/02HV

are

monolithic

switching

2

•

Integrated 0.5A N-channel 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 735

•

500 mA Output Current Over Temperature

mA

(typical)

for

step-down

(Buck)

regulators.

•

Cycle-by-Cycle Current Limit

Hysteretic control with controlled on-time coupled with

•

No Control Loop Compensation Required

an external resistor allow the converter output voltage

to adjust as needed to deliver a constant current to

•

Separate PWM Dimming and Low Power

series and series - parallel connected arrays of LEDs

Shutdown

of varying number and type, LED dimming by pulse

•

Supports All-ceramic Output Capacitors and

width

modulation

(PWM),

broken/open

LED

Capacitor-less Outputs

protection,

low-power

shutdown

and

thermal

•

Thermal Shutdown Protection

shutdown complete the feature set.

•

VSSOP, SO PowerPAD Packages

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

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PRODUCTION DATA information is current as of publication date.

Copyright © 2006–2013, 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.