LM3411M5-5.0 / NOPB Optical Popular Complex Integrated Circuits Precision Secondary Regulator / Driver

LM3411M5-5.0 / NOPB Optical Popular Complex Integrated Circuits Precision Secondary Regulator / Driver

Precision Secondary Regulator/Driver

Features

► Fixed voltages of 3.3V and 5.0V

with initial tolerance of ±1% for standard grade

and ±0.5% for A grade

► Custom voltages available (3V–17V)

► Wide output current range, 20 µA–15 mA

► Low temperature coefficient

► Available in 5-lead SOT23-5 surface mount package

(tape and reel)

Applications

► 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

General Description

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 guaranteed 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.

Typical Application and Functional Diagram

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