Hysteretic PFET Controller for High Power LED Drive - LM3401

LM3401 (ACTIVE)

Hysteretic PFET Controller for High Power LED Drive

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Description

The LM3401 is a switching controller designed to provide constant current to high power LEDs. The LM3401 drives an external P-MOSFET switch for step-down (Buck) regulators. The LM3401 delivers constant current within ±6% accuracy to a wide variety and number of series connected LEDs. Output current is adjusted with an external current sensing resistor to drive high power LEDs in excess of 1A.

For improved accuracy and efficiency, the LM3401 features dual-side hysteresis, very low reference voltage, and short propagation delay. A cycle by cycle current limit provides protection against over current and short circuit failures. Additional features include adjustable hysteresis and a CMOS compatible input pin for PWM dimming.

Features

  • Hysteretic Control for Speed and Simplicity
  • Input Operating Range of 4.5V-35V
  • 1.5MHz Maximum Switching Frequency
  • Low 200mV Reference Voltage
  • Programmable Current Limit
  • High speed CMOS Compatible Enable/Dimming
  • Adjustable Hysteresis
  • Input UVLO
  • No output Capacitor Required
  • 8-pin VSSOP Package

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Parametrics Compare all products in LED Lighting - Illumination

 
Input Voltage (Type)
Vin (Min) (V)
Vin (Max) (V)
Iout (Max) (A)
Vout (Min) (V)
Vout (Max) (V)
Regulated Outputs (#)
Topology
Dimming Method
Type
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Vref (V)
UVLO Thresholds On/Off (V)
Special Features
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
LM3401
DC/DC    
4.5    
35    
1    
0.2    
33    
1    
Buck    
PWM    
Inductive    
100    
1500    
1.05    
0.2    
4.3 / 3.8    
Adjustable Switch Frequency
Enable/Shutdown    
Catalog    
-40 to 125    
8VSSOP    
0.60 | 1ku    

Related end equipment

  • LED Driver
  • Battery Charger

WEBENCH® LM3401
 
4.50 <=


V in Lower
 V
 
<=


V in Upper
 V
 
<= 35.00
Ambient Temp  °C <= 125
Light Output (optional)  Lumens



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