1FEATURES

2? Hysteretic Control for Speed and Simplicity

? Input Operating Range of 4.5V-35V

? 1.5MHz Maximum Switching Frequency

? Low 200mV Reference Voltage

? Programmable Current Limit

? High speed CMOS Compatible

Enable/Dimming

? Adjustable Hysteresis

? Input UVLO

? No output Capacitor Required

? 8-pin VSSOP Package

APPLICATIONS

? LED Driver

? Battery Charger

DESCRIPTION

The LM3401 is a switching controller designed to

provide constant current to high power LEDs. The

LM3401 drives an external P-MOSFET switch for

step-down (Buck) regulators. The LM3401 delivers

constant current within ±6% accuracy to a wide

variety and number of series connected LEDs. Output current is adjusted with an external current sensing

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

For improved accuracy and efficiency, the LM3401

features dual-side hysteresis, very low reference

voltage, and short propagation delay. A cycle by

cycle current limit provides protection against over

current and short circuit failures. Additional features

include adjustable hysteresis and a CMOS

compatible input pin for PWM dimming.