LM3404HV 1.0A Constant Current Buck Regulator for High Power LED Drivers | TI.com

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1.0A Constant Current Buck Regulator for High Power LED Drivers


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The LM3404 and LM3404HV devices are monolithic switching regulators designed to deliver constant currents to high power LEDs. Ideal for automotive, industrial, and general lighting applications, these devices contain a high-side N-channel MOSFET switch with a current limit of 1.5-A (typical) for step-down (Buck) regulators. Hysteretic controlled on-time and an external 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. Some features are: LED dimming using pulse width modulation (PWM), broken or open LED protection, low-power shutdown, and thermal shutdown.


  • Integrated 1-A MOSFET
  • VIN Range 6 V to 42 V (LM3404)
  • VIN Range 6 V to 75 V (LM3404HV)
  • 1.2-A Output Current Overtemperature
  • Cycle-by-Cycle Current Limit
  • No Control Loop Compensation Required
  • Separate PWM Dimming and Low Power
  • Supports All-Ceramic Output Capacitors and
  • Thermal Shutdown Protection
  • SOIC-8 Package, SO PowerPAD™-8 Package

WEBENCH® Designer LM3404HV

  V in Lower V in Upper
6.0 ≤  V  V ≤ 75.0
Ambient Temp  °C ≤ 100°C
Light Output (optional)  Lumens


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Part number Order Input voltage (type) Vin (Min) (V) Vin (Max) (V) Iout (Max) (A) Vout (Min) (V) Vout (Max) (V) Regulated outputs (#) Topology Dimming method Power factor correction (Min) Type Switching frequency (Min) (kHz) Switching frequency (Max) (kHz) Iq (Typ) (mA) Vref (V) UVLO thresholds on/off (V) Features Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
LM3404HV Order now DC/DC     6     75     1     0.2     73     1     Buck     PWM         Inductive     20     1000     0.625     0.2     5.3 / 5.15     Adjustable Switch Frequency
Integrated Switch
Thermal Shutdown    
-40 to 125     SO PowerPAD | 8
SOIC | 8    
8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)