LM3411M5-3.3 National Semiconductor, LM3411M5-3.3 Datasheet

LM3411M5-3.3

Manufacturer Part Number

LM3411M5-3.3

Description

Precision Secondary Regulator/Driver

Manufacturer

National Semiconductor

Datasheet

1.LM3411M5-3.3.pdf (13 pages)

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LM3411

Precision Secondary Regulator/Driver

General Description

The LM3411 is a low power fixed-voltage (3.3V or 5.0V) pre-

cision shunt regulator designed specifically for driving an op-

toisolator to provide feedback isolation in a switching regula-

tor.

The LM3411 circuitry includes an internally compensated op

amp, a bandgap reference, NPN output transistor, and volt-

age setting resistors.

A trimmed precision bandgap reference with temperature

drift curvature correction, provides a guaranteed 1% preci-

sion 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 criti-

cal applications.

Although its main application is to provide a precision output

voltage (no trimming required) and maintain very good regu-

lation in isolated DC/DC converters, it can also be used with

Typical Application and Functional Diagram

SIMPLE SWITCHER

™

is a tradmark of National Semiconductor Corporation.

DS011987

Basic Isolated DC/DC Converter

LM3411 Functional Diagram

other types of voltage regulators or power semiconductors to

provide a precision output voltage without precision resistors

or trimming.

Features

n Fixed voltages of 3.3V and 5.0V with initial tolerance of

n Custom voltages available (3V–17V)

n Wide output current range, 20 µA–15 mA

n Low temperature coefficient

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

Applications

n Secondary controller for isolated DC/DC PWM switching

n Use with LDO regulator for high-precision fixed output

n Precision monitoring applications

n Use with many types of regulators to increase precision

(tape and reel)

regulators systems

regulators

and improve performance

1% for standard grade and

DS011987-2

DS011987-1

0.5% for A grade

December 1999

www.national.com

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