LM3407 350 mA, Constant Current Output Floating Buck Switching Converter for High Power LEDs | TI.com

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350 mA, Constant Current Output Floating Buck Switching Converter for High Power LEDs


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The LM3407 device is a constant current output floating buck switching converter designed to provide constant current to high-power LEDs. The device is ideal for automotive, industrial, and general lighting applications. The LM3407 has an integrated power N-channel MOSFET that makes the application solution compact and simple to implement. An external 1% thick-film resistor allows the converter output voltage to adjust as needed to deliver constant current within 10% accuracy to a serially connected LED string of varying number and type. Converter switching frequency is adjustable from 300 kHz to 1 MHz. The LM3407 features a dimming input to enable LED brightness control by Pulse Width Modulation (PWM). Additionally, a separate enable pin allows for low-power shutdown. An exposed pad MSOP-8 package provides excellent heat dissipation and thermal performance. Input UVLO and output open-circuit protection ensure a robust LED driver solution.


  • Input Operating Range 4.5 V to 30 V
  • Output Voltage Range: 0.1 VIN to 0.9 VIN
  • Accurate Constant Current Output
  • Independent Device Enable (CMOS Compatible) and PWM Dimming Control
  • Converter Switching Frequency Adjustable From 300 kHz to 1 MHz
  • No External Control Loop Compensation Required
  • Supports Ceramic and Low ESR Output Capacitors
  • Input Undervoltage Lockout (UVLO)
  • Thermal Shutdown Protection
  • MSOP-8 PowerPAD Package

WEBENCH® Designer LM3407

  V in Lower V in Upper
4.5 ≤  V  V ≤ 30.0
Ambient Temp  °C ≤ 125°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)
LM3407 Order now DC/DC     4.5     30     0.35     0.45     27     1     Buck     PWM         Converter
300     1000     0.78     0.2     3.6 / 3.4     Adjustable Switch Frequency
Integrated Switch
Thermal Shutdown    
-40 to 125     HVSSOP | 8     8HVSSOP: 15 mm2: 4.9 x 3 (HVSSOP | 8)