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.