TI LM3401MMX/NOPB

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. The LM3401 is a step-down DC-DC controller designed to provide a constant current source for driving a high power LED string. The LM3401 uses comparator-based voltage mode hysteretic control for a simple and stable design. Hysteretic control does not utilize an internal oscillator, but relies on output conditions to directly control switching. The LM3401 controls LED current within the adjustable hysteresis window by monitoring peak and valley voltage at the SNS pin. A dual sided hysteresis window is used to optimize accuracy.

• 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
• MSOP - 8 package

• LED Driver
• Battery Charger