LM3411

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SNVS113E – DECEMBER 1999 – REVISED APRIL 2013

LM3411 Precision Secondary Regulator/Driver

Check for Samples: LM3411

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FEATURES

DESCRIPTION

The LM3411 is a low power fixed-voltage (3.3V or

2

•

Fixed Voltages of 3.3V and 5.0V with Initial

5.0V) precision shunt regulator designed specifically

Tolerance of ±1% for Standard Grade and

for driving an optoisolator to provide feedback

±0.5% for A Grade

isolation in a switching regulator.

•

Custom Voltages Available (3V–17V)

The

LM3411

circuitry

includes

an

internally

•

Wide Output Current Range, 20

μA–15 mA

compensated op amp, a bandgap reference, NPN

•

Low Temperature Coefficient

output transistor, and voltage setting resistors.

•

Available in 5-Lead SOT23-5 Surface Mount

A

trimmed

precision

bandgap

reference

with

Package (Tape and Reel)

temperature drift curvature correction, provides a

ensured 1% precision over the operating temperature

APPLICATIONS

range (A grade version). The amplifier's inverting

input is externally accessible for loop frequency

•

Secondary Controller for Isolated DC/DC PWM

compensation when used as part of a larger servo

Switching Regulators Systems

system. The output is an open-emitter NPN transistor

•

Use with LDO Regulator for High-Precision

capable of driving up to 15 mA of load current.

Fixed Output Regulators

Because of its small die size, the LM3411 has been

•

Precision Monitoring Applications

made available in the sub-miniature 5-lead SOT23-5

•

Use with many Types of Regulators to

surface mount package. This package is ideal for use

Increase Precision and Improve Performance

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.

Typical Application and Functional Diagram

Figure 1. Basic Isolated DC/DC Converter

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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PRODUCTION DATA information is current as of publication date.

Copyright © 1999–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.