LM3411 Precision Secondary Regulator/Driver | TI.com


Precision Secondary Regulator/Driver

Precision Secondary Regulator/Driver - LM3411

Other devices and data sheet

Other device variants can also be found in the  LM3411-L product page


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)

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Parametrics Compare all products in Shunt Voltage Reference

Operating Temperature Range (C)
Package Group
-40 to 85