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LM3404MA (SOIC) - 1A Constant Current Buck Regulator for HB LEDs (LM3404EVAL Board)

Inventory: In stock


Limit:  2

Features for the LM3404EVAL

  • Integrated 1.0A MOSFET
  • VIN Range 6V to 42V
  • 1.2A Output Current Over Temperature
  • Cycle-by-Cycle Current Limit
  • No Control Loop Compensation Required
  • Separate PWM Dimming and Low Power Shutdown
  • Supports All-Ceramic Output Capacitors and Capacitor-Less Outputs
  • Thermal Shutdown Protection
  • SO-8 Package


  • LED Backlight
  • Constant Current Source
  • Automotive Lighting
  • General Illumination
  • Industrial Lighting


Description for the LM3404EVAL

The LM3404/04HV is a buck regulator derived controlled current source designed to drive a series string of high power, high brightness LEDs (HBLEDs) such as the Luxeon™ K2 Emitter at forward currents of up to 1.0A. The board can accept an input voltage ranging from 6V to 42V when using the LM3404. When using the pin-for-pin compatible LM3404HV the upper bound of input voltage is 75V. The converter output voltage adjusts as needed to maintain a constant current through the LED array. The LM3404/04HV is a true step-down regulator with an output voltage range extending from a VO(MIN) of 200 mV (the reference voltage) to a VO(MAX) determined by the minimum off time (typically 300 ns). It can maintain regulated current through any number of LEDs as long as the combined forward voltage of the array does not exceed VO(MAX).