LM123/LM223
LM323
March 1993
THREE-TERMINAL 3A-5V POSITIVE VOLTAGE REGULATORS
.
OUTPUT CURRENT : 3A
.
INTERNAL CURRENT AND THERMAL LIMI-
TING
.
TYPICAL OUPUT IMPEDANCE : 0.01
.
MINIMUM INPUT VOLTAGE : 7.5V
.
POWER DISSIPATION : 30W
DESCRIPTION
The LM123, LM223, LM323 are three-terminal posi-
tive voltage regulators with a preset 5V output and
a load driving capability of 3A. New circuit design
and processing techniques are used to provide the
high output current without sacrificing the regulation
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 ob-
tained with these techniques in the LM209, 1A regu-
lator.
An overall worst case specification for the combined
effects of input voltage, load current, ambient tem-
perature, and power dissipation ensure that the
LM123, LM223, LM323 will perform satisfactorily as
a system element.
TO-3
PIN CONNECTION
1 - Input
2 - Output
TO-3
(bottom view)
ORDER CODES
Part Number
Temperature
Range
Package
K
T
LM123
-55
o
C to 150
o
C
LM223
-25
o
C to 150
o
C
LM323
0
o
C to 125
o
C
TO-220
TO-220
(front view)
1 - Input
2 - Output
3 - GND
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SCHEMATIC DIAGRAM
Case
VI
VO
GND
TO-3
1
2
Case
TO-220
1
2
3
ABSOLUTE MAXIMUM RATING
Symbol
Parameter
Value
Unit
V
I
Input Voltage
20
V
I
O
Output Current
Internally Limited
P
tot
Power Dissipation
Internally Limited
T
oper
Operating Junction Temperature Range
LM123
-55 to 150
o
C
LM223
-25 to 150
LM323
0 to 125
T
stg
Storage Temperature Range
-65 to 150
o
C
THERMAL CHARACTERISTICS
Symbol
Parameter
Typ.
Max.
Unit
R
thj-case
Junction-case Thermal Resistance
TO-3
2
o
C/W
TO-220
3
R
thj-amb
Junction-ambient Thermal Resistance
TO-3
35
o
C/W
TO-220
50
LM123-LM223-LM323
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ELECTRICAL CHARACTERISICS
LM123: -55
o
C < Tj < 150
o
C
LM223: -25
o
C < Tj < 150
o
C
LM323: 0
o
C < Tj < 150
o
C
Symbol
Parameter
LM123/LM223
LM323
Unit
Min.
Typ.
Max.
Min.
Typ.
Max.
V
O
Output Voltage Range (Note 2)
T
amb
= 25
o
C, V
I
= 7.5 V, I
O
= 0
4.7
5
5.3
4.8
5
5.2
V
V
O
Output Voltage Range (Note 2)
T
min
T
j
T
max
, P
P
max
7.5 V
V
I
15 V, 0
I
O
3 A
4.6
5.4
4.75
5.25
V
K
VI
Line Regulation (Note 3)
T
j
= 25
o
C, 7.5 V
V
I
15V
5
25
5
25
mV
K
VO
Load Regulation (Note 3)
T
j
= 25
o
C, V
I
= 7.5 V, 0
I
O
3 A
25
100
25
100
mV
I
IB
Quiescent Current
7.5 V
V
I
15 V, 0
I
O
3 A
12
20
12
20
mA
V
NO
Output Noise Voltage
T
amb
= 25
o
C, 10 Hz
f
100 KHz
40
40
V
rms
I
OS
Short Circuit Current Limit (T
j
= 25
o
C)
V
I
= 15 V
V
I
= 7.5V
3
4
4.5
5
3
4
4.5
5
A
A
K
VH
Long Term Stability
35
35
mV
Notes : 1. Although power dissipation is internally limited, specifications apply only for P
30W.
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%.
LM123-LM223-LM323
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TYPICAL APPLICATIONS
BASIC 3A REGULATOR
TRIMING OUTPUT TO 5V
C
1
= R equired if regul ator is distant from f il ter
capacitors.
C
L
= R egulator is stable wit h no load capacitor int o
r esistive loads.
LM123-LM223-LM323
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