The LM3401is a switching controller designed toprovide constant current to high power LEDs. TheLM3401 drives an external P-MOSFET switch forstep-down(Buck)regulators. The LM3401 deliversconstant current within +6% accuracy to a widevariety and number of series connected LEDs. Outputcurrent is adjusted with an external current sensingresistor to drive high power LEDs in excess of 1A.
For improved accuracy and efficiency, the LM3401features dual-side hysteresis,very low referencevoltage,and short propagation delay.A cycle bycycle current limit provides protection against overcurrent and short circuit failures. Additional featuresinclude adjustable hysteresis andCMOSacompatible input pin for PwM dimming.