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.
● 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
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