LM123/LM223
LM323
THREE-TERMINAL 3A-5V POSITIVE VOLTAGE REGULATORS
.
.
.
.
.
OUTPUT CURRENT : 3A
INTERNAL CURRENT AND THERMAL LIMI-
TING
TYPICAL OUPUT IMPEDANCE : 0.01Ω
MINIMUM INPUT VOLTAGE : 7.5V
POWER DISSIPATION : 30W
TO-3
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-220
ORDER CODES
Part Number
LM123
LM223
LM323
Temperature
Range
-55 C to 150 C
-25 C to 150 C
0 C to 125 C
o
o
o
o
o
o
Package
K
•
•
•
•
T
PIN CONNECTION
TO-3
(bottom view)
TO-220
(front view)
1 - Input
2 - Output
3 - GND
1 - Input
2 - Output
March 1993
1/9
LM123-LM223-LM323
ABSOLUTE MAXIMUM RATING
Symbol
V
I
I
O
P
tot
T
oper
Input Voltage
Output Current
Power Dissipation
Operating Junction Temperature Range
LM123
LM223
LM323
T
stg
Storage Temperature Range
Parameter
Value
20
Internally Limited
Internally Limited
-55 to 150
-25 to 150
0 to 125
-65 to 150
o
o
Unit
V
C
C
THERMAL CHARACTERISTICS
Symbol
Parameter
TO-3
TO-220
R
thj-amb
Junction-ambient Thermal Resistance
TO-3
TO-220
Typ.
2
3
35
50
o
Max.
Unit
o
R
thj-case
Junction-case Thermal Resistance
C/W
C/W
SCHEMATIC DIAGRAM
Case
TO-3
TO-220
VI
1
1
VO
2
2
GND
Case
3
2/9
LM123-LM223-LM323
ELECTRICAL CHARACTERISICS
o
o
LM123:
-55 C < Tj < 150 C
LM223:
-25
o
C < Tj < 150
o
C
LM323:
0
o
C < Tj < 150
o
C
Symbol
V
O
V
O
Parameter
Output Voltage Range (Note 2)
T
amb
= 25
o
C, V
I
= 7.5 V, I
O
= 0
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
Line Regulation (Note 3)
T
j
= 25
o
C, 7.5 V
≤
V
I
≤
15V
Load Regulation (Note 3)
T
j
= 25
o
C, V
I
= 7.5 V, 0
≤
I
O
≤
3 A
Quiescent Current
7.5 V
≤
V
I
≤
15 V, 0
≤
I
O
≤
3 A
Output Noise Voltage
T
amb
= 25
o
C, 10 Hz
≤
f
≤
100 KHz
Short Circuit Current Limit (T
j
= 25
o
C)
V
I
= 15 V
V
I
= 7.5V
Long Term Stability
LM123/LM223
Min.
4.7
4.6
Typ.
5
Max.
5.3
5.4
Min.
4.8
4.75
LM323
Typ.
5
Max.
5.2
5.25
V
V
Unit
K
VI
K
VO
I
IB
V
NO
I
OS
5
25
12
40
25
100
20
5
25
12
40
25
100
20
mV
mV
mA
µV
rms
3
4
4.5
5
35
3
4
4.5
5
35
A
A
mV
K
VH
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%.
3/9
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