Precision Secondary Regulator/Driver - LM3411


Precision Secondary Regulator/Driver



The LM3411 is a low-power fixed-voltage (3.3 V or 5 V) precision shunt regulator designed specifically for driving an optoisolator to provide feedback isolation in a switching regulator.

The LM3411 circuitry includes an internally compensated operational amplifier, a bandgap reference, NPN output transistor, and voltage setting resistors.

A trimmed precision bandgap reference with temperature drift curvature correction provides a ensured 1% precision over the operating temperature range (A grade version). The inverting input of the amplifier is externally accessible for loop frequency compensation when used as part of a larger servo system. The output is an open-emitter NPN transistor capable of driving up to 15 mA of load current.

Because of its small die size, the LM3411 has been made available in the subminiature 5-pin SOT-23 surface-mount package. This package is ideal for use in space-critical applications.

Although its main application is to provide a precision output voltage (no trimming required) and maintain very good regulation in isolated DC-DC converters, it can also be used with other types of voltage regulators or power semiconductors to provide a precision output voltage without precision resistors or trimming.


  • Fixed Voltages of 3.3 V and 5 V With Initial
    Tolerance of ±1% for Standard Grade and ±0.5%
    for A Grade
  • Custom Voltages Available (3 V to 17 V)
  • Wide Output Current Range (20 µA to 15 mA)
  • Low Temperature Coefficient
  • Available in 5-Pin SOT-23 Surface-Mount
    Package (Tape and Reel)

View more

Parametrics Compare all products in Single Channel LDO

Iout (Max) (A)
Output Options
Vin (Min) (V)
Vin (Max) (V)
Fixed Output Options (V)
Vout (Min) (V)
Vout (Max) (V)
Iq (Typ) (mA)
Operating Temperature Range (C)
Approx. Price (US$)
Fixed Output   
-40 to 85   
0.50 | 1ku   

Related end equipment

  • Secondary Controller for Isolated DC-DC PWM
    Switching Regulators Systems
  • Use With LDO Regulator for High-Precision,
    Fixed-Output Regulators
  • Precision Monitoring Applications
  • Use With Many Types of Regulators to Increase
    Precision and Improve Performance

All trademarks are the property of their respective owners.