LM3464/LM3464A LED Driver

LED driver with dynamic headroom control and thermal control interfaces
from National Semiconductor

National Semiconductor - LM3464/LM3464A LED Driver National Semiconductor's LM3464/LM3464A is a 4-channel high voltage current regulator that provides a simple solution for LED lighting applications. The LM3464/LM3464A provides four individual current regulator channels and works in conjunction with external N-channel MOSFETs and sense resistors to give accurate driving current for every LED string. Additionally, the Dynamic Headroom Control (DHC) output can be interfaced to the external power supply to adjust the LED supply voltage to the lowest level that is adequate to maintain all the string currents in regulation, yielding the optimal overall efficiency.  LM3464 Datasheet

   Features    Applications
  • Wide input voltage range
    12V-80V (LM3464)
    12V–95V (LM3464A)
  • Dynamic headroom control ensures maximum efficiency
  • 4 output channels with individual current regulation
  • High channel to channel accuracy
  • Digital PWM/analog dimming control interface
  • Resistor programmable dimming frequency & minimum duty cycle (analog dimming mode)
  • Direct interface to thermal sensor
  • Fault detection
  • Over temperature protection
  • Thermal shutdown
  • Under voltage lockout
  • Thermal enhanced eTSSOP-28 package
  • Streetlights
  • Solid state lighting solutions
  • RoHS Compliant

National Semiconductor
Part Number
Part Number
Voltage -
LM3464MH/NOPB LM3464MH/NOPB-ND 12V to 80V 28-TSSOP, Exposed Pad
(0.173", 4.40mm Width)
LM3464 Datasheet

Evaluation Board
National Semiconductor
Part Number
Part Number
LM3464EVAL/NOPB LM3464EVAL/NOPB-ND This evaluation board demonstrates the system efficiency and LED current regulation accuracy of the LM3464 LED driver typical application circuit as a 50W LED lighting system. The evaluation board can adapt to different types of primary power supplies with changes of value to only a few components. LM3464 Eval Board Datasheet