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LM123K/883 ,3-Amp, 5-Volt Positive Regulator
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LM123K-LM323K
3-Amp/ 5-Volt Positive Regulator
LM123/LM323A/LM323
3-Amp, 5-Volt Positive Regulator
General DescriptionThe LM123isa three-terminal positive regulatorwitha pre-
set5V outputanda load driving capabilityof3 amps. New
circuitdesignand processing techniquesare used toprovide
the high output current without sacrificingthe regulation
characteristicsof lower current devices.
The LM323A offers improved precision overthe standard
LM323. Parameters with tightened specifications include
output voltage tolerance,line regulation,and load regulation.
The3 amp regulatoris virtually blowout proof. Current limit-
ing, power limiting,and thermal shutdown providethe same
high levelof reliability obtainedwith these techniquesinthe
LM1091 amp regulator. external componentsare requiredfor operationofthe
LM123. Ifthe deviceis more than 4inches fromthe filterca-
pacitor, however,a1μF solid tantalum capacitor shouldbe
usedonthe input.A0.1μFor larger capacitor maybe usedthe outputto reduce load transient spikes createdbyfast
switching digital logic,orto swampout stray load capaci-
tance. overall worst case specificationforthe combined effects input voltage, load currents, ambient temperature, and
power dissipation ensurethatthe LM123will perform satis-
factorilyasa system element.
For applications requiring other voltages,see LM150 series
adjustable regulator data sheet.
Operationis guaranteed overthe junctiontemperature range
−55˚Cto +150˚Cfor LM123, −40˚Cto +125˚Cfor LM323A,
and0˚Cto +125˚Cfor LM323.A hermetic TO-3 packageis
usedfor high reliabilityandlow thermal resistance.
Features Guaranteed1% initial accuracy(A version)3 amp output current Internal currentand thermal limiting 0.01Ω typical output impedance 7.5V minimum input voltage 30W power dissipationP+ Product Enhancement tested
Connection Diagram
Typical Applications
Metal Can PackageDS007771-2
Order Number LM123K STEEL, LM323AK STEELor LM323K STEEL
SeeNS Package Number K02A
Order Number LM123K/883
SeeNS Package Number K02C
Basic3 Amp RegulatorDS007771-3
*Requiredif LM123ismore than4"fromfilter capacitor.
†Regulatoris stablewithnoload capacitorinto resistiveloads.
April 1998
LM123/LM323A/LM323
3-Amp,
5-V
olt
Positive
Regulator©1999 National Semiconductor Corporation DS007771
