LM123, LM323-N, LM323A

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SNVS757B – MAY 2004 – REVISED NOVEMBER 2004

LM123/LM323A/LM323-N 3-Amp, 5-Volt Positive Regulator

Check for Samples: LM123, LM323-N, LM323A

The 3 amp regulator is virtually blowout proof.

1

FEATURES

Current limiting, power limiting, and thermal shutdown

2

•

Ensured 1% Initial Accuracy (A Version)

provide the same high level of reliability obtained with

•

3 Amp Output Current

these techniques in the LM109 1 amp regulator.

•

Internal Current and Thermal Limiting

No external components are required for operation of

•

0.01

Ω Typical Output Impedance

the LM123. If the device is more than 4 inches from

the filter capacitor, however, a 1

μF solid tantalum

•

7.5V Minimum Input Voltage

capacitor should be used on the input. A 0.1

μF or

•

30W Power Dissipation

larger capacitor may be used on the output to reduce

•

load transient spikes created by fast switching digital

logic, or to swamp out stray load capacitance.

DESCRIPTION

An overall worst case specification for the combined

The LM123 is a three-terminal positive regulator with

effects of input voltage, load currents, ambient

a preset 5V output and a load driving capability of 3

temperature, and power dissipation ensure that the

amps. New circuit design and processing techniques

LM123

will

perform

satisfactorily

as

a

system

are used to provide the high output current without

element.

sacrificing the regulation characteristics of lower

For applications requiring other voltages, see LM150

current devices.

series adjustable regulator data sheet.

The LM323A offers improved precision over the

Operation is specified over the junction temperature

standard

LM323-N.

Parameters

with

tightened

range

−55°C to +150°C for LM123, −40°C to +125°C

specifications include output voltage tolerance, line

for LM323A, and 0°C to +125°C for LM323-N. A

regulation, and load regulation.

hermetic TO-3 package is used for high reliability and

low thermal resistance.

Connection Diagram

Metal Can Package

Figure 1. See Package Number NDS

1

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

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2004, 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.