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.
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