The LM3411 is a low power fixed-voltage (3.3V or 5.0V) precision shunt regulator designed specifically for driving an optoisolator to provide feedback isolation in a switching regulator.
The LM3411 circuitry includes an internally compensated op amp, 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 amplifier's inverting input 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 sub-miniature 5-lead SOT23-5 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.
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|Iout (Max) (A)|
|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$)|
| 3.3 |
|-40 to 85|
|0.50 | 1ku|
|Sample & Buy|