| VO (V) | 3.3, 5 |
| Reference voltage | Fixed |
| Initial accuracy (Max) (%) | 0.5, 1 |
| VO adj (Min) (V) | 3.3 |
| VO adj (Max) (V) | 5 |
| Iz for regulation (Min) (uA) | 85 |
| Rating | Catalog |
| Temp coeff (Max) (ppm/ degree C) | 61 |
| Operating temperature range (C) | -40 to 85 |
| Iout/Iz (Max) (mA) | 15 |
- 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)
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.