ST LM123, LM223, LM323 User Manual
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LM123/LM223
LM323
THREE-TERMINAL 3A-5V POSITIVE VOLTAGE REGULATORS
.OUTPUT CURRENT : 3A
.INTERNAL CURRENT AND THERMAL LIMI-
TING
.TYPICALOUPUT IMPEDANCE : 0.01Ω
.MINIMUMINPUT VOLTAGE: 7.5V
.POWER DISSIPATION : 30W
TO-3
DESCRI PTIO N
The LM123, LM223,LM323arethree-terminalpositive voltageregulators with a preset 5V output and
a load driving capability of 3A. New circuit design
and processing techniques areused to provide the
highoutputcurrent withoutsacrificing theregulation
characteristics of lower current devices.
The 3A regulator is virtually blowout proof.
Current limiting, power limiting and thermal shut-
down provide the same high level of reliability obtainedwith thesetechniques in theLM209, 1Aregulator.
An overallworstcasespecification for thecombined
effects of input voltage, load current, ambient temperature, and power dissipation ensure that the
LM123,LM223,LM323 will performsatisfactorily as
a system element.
ORDER CODES
Part Number Temperature
LM123 -55
LM223 -25
LM323 0
TO-220
Package
Range
o
C to 150oC •
o
C to 150oC •
o
C to 125oC ••
KT
PIN CONNEC T ION
(bot t om view)
March1993
TO-3
1 - Input
2 - Output
TO-220
(front view)
1 - Input
2 - Output
3 - GND
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LM123-LM223-LM323
ABSOLU TE MAXIMU M RAT ING
Symbol Parameter Value Unit
V
Input Voltage 20 V
I
I
Output Current Internally Limited
O
P
Power Dissipation Internally Limited
tot
T
THERMA L CHA R ACTE R ISTI CS
Symbol Parameter Typ. Max. Unit
R
R
SCHEM ATIC D IA G RA M
Operating Junction Temperature Range LM123 -55 to 150
oper
LM223 -25 to 150
LM323 0 to 125
T
Storage Temperature Range -65 to 150
stg
Junction-case Thermal Resistance TO-3 2
thj-case
TO-220 3
Junction-ambient Thermal Resistance TO-3 35
thj-amb
TO-220 50
o
o
o
C
o
C
C/W
C/W
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Case VI VO GND
TO-3 1 2 Case
TO-220 1 2 3
LM123-LM223-LM323
ELECTRIC AL CH A RAC TERI SI C S
LM123: -55oC<Tj<150oC
LM223: -25oC<Tj<150oC
LM323: 0oC<Tj<150oC
Symbol Parameter LM123/LM223 LM323 Unit
Min. Typ. Max. Min. Typ. Max.
V
Output Voltage Range (Note 2)
O
T
=25oC, VI= 7.5 V, IO=0
amb
V
Output Voltage Range (Note 2)
O
T
min
≤ Tj≤ T
max
,P≤P
max
7.5 V ≤ VI≤ 15 V, 0≤ IO≤ 3A
K
Line Regulation (Note 3)
VI
Tj=25oC, 7.5 V ≤ VI≤ 15V
K
Load Regulation (Note 3)
VO
Tj=25oC, VI= 7.5 V, 0 ≤ IO≤ 3A
I
Quiescent Current
IB
7.5 V ≤ V
V
Output Noise Voltage
NO
T
amb
I
Short Circuit Current Limit (Tj=25oC)
OS
≤ 15 V, 0≤ IO≤ 3A
I
=25oC, 10 Hz ≤ f ≤ 100 KHz
VI=15V
VI= 7.5V
K
Notes : 1. Although power dissipation is internally limited, specifications apply only for P ≤ 30W.
Long Term Stability 35 35 mV
VH
2. Selected devices with tightened tolerance output voltage available.
3. Load and line regulation are specified at constant junction temperature. Pulse testing is required with a pulse width
≤ 1ms and a duty cycle ≤ 5%.
4.7 5 5.3 4.8 5 5.2 V
4.6 5.4 4.75 5.25 V
5 25 5 25 mV
25 100 25 100 mV
12 20 12 20 mA
40 40 µV
3
4.5
4
5
3
4.5
4
5
rms
A
A
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