HYS

ILIM

DIM

CS

HG

SNS

VIN

LM3401

LED

current

C1

L1

GND

R1

R2

R3

Q1

VIN = 4.5V to 35V

D1

LM3401

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SNVS516C – AUGUST 2007 – REVISED MAY 2013

LM3401 Hysteretic PFET Controller for High Power LED Drive

Check for Samples: LM3401

1

FEATURES

DESCRIPTION

The LM3401 is a switching controller designed to

2

•

Hysteretic Control for Speed and Simplicity

provide constant current to high power LEDs. The

•

Input Operating Range of 4.5V-35V

LM3401 drives an external P-MOSFET switch for

•

1.5MHz Maximum Switching Frequency

step-down (Buck) regulators. The LM3401 delivers

constant current within ±6% accuracy to a wide

•

Low 200mV Reference Voltage

variety and number of series connected LEDs. Output

•

Programmable Current Limit

current is adjusted with an external current sensing

•

High speed CMOS Compatible

resistor to drive high power LEDs in excess of 1A.

Enable/Dimming

For improved accuracy and efficiency, the LM3401

•

Adjustable Hysteresis

features dual-side hysteresis, very low reference

•

Input UVLO

voltage, and short propagation delay. A cycle by

cycle current limit provides protection against over

•

No output Capacitor Required

current and short circuit failures. Additional features

•

8-pin VSSOP Package

include

adjustable

hysteresis

and

a

CMOS

compatible input pin for PWM dimming.

APPLICATIONS

•

LED Driver

•

Battery Charger

TYPICAL APPLICATION CIRCUIT

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.