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1.5A Automotive Constant Current Buck Regulator for Driving High Power LEDs


Package | PIN: PWP | 14
Temp: S (-40 to 150)
Carrier: Cut Tape
Qty Price
1-9 $2.22
10-24 $2.00
25-99 $1.86
100-249 $1.63
250-499 $1.53
500-749 $1.30
750-999 $1.10
1000+ $1.05


  • LM3406HV-Q1
    • Automotive Grade Device
    • AEC-Q100 Grade 1 Qualified
    • Operating Ambient Temperature: –40°C to 125°C
  • Integrated 2.0A MOSFET
  • VIN Range 6V to 42V (LM3406)
  • VIN Range 6V to 75V (LM3406HV)
  • VIN Range 6V to 75V (LM3406HV-Q1)
  • True Average Output Current Control
  • 1.7A Minimum Output Current Limit Over Temperature
  • Cycle-by-Cycle Current Limit
  • PWM Dimming with Dedicated Logic Input
  • PWM Dimming with Power Input Voltage
  • Simple Control Loop Compensation
  • Low Power Shutdown
  • Supports All-Ceramic Output Capacitors and Capacitor-less Outputs
  • Thermal Shutdown Protection
  • TSSOP-14 Package

Texas Instruments  LM3406HVQMHXQ1

The LM3406 family are monolithic switching regulators designed to deliver constant currents to high power LEDs. Ideal for automotive, industrial, and general lighting applications, they contain a high-side N-channel MOSFET switch with a current limit of 2.0A (typical) for step-down (Buck) regulators. Controlled on-time with true average current and an external current sense resistor allow the converter output voltage to adjust as needed to deliver a constant current to series and series-parallel connected LED arrays of varying number and type. LED dimming via pulse width modulation (PWM) is achieved using a dedicated logic pin or by PWM of the power input voltage. The product feature set is rounded out with low-power shutdown and thermal shutdown protection.