L78S00
SERIES
January 1993
2A POSITIVE VOLTAGE REGULATORS
.
OUTPUT CURRENT TO 2A
.
OUTPUT VOLTAGES OF 5 ; 7.5 ; 9 ; 10 ; 12 ; 15 ;
18 ; 24V
.
THERMAL OVERLOAD PROTECTION
.
SHORT CIRCUIT PROTECTION
.
OUTPUT TRANSISTOR SOA PROTECTION
DESCRIPTION
The L78S00 series of three-terminal positive regu-
lators is available in TO-220 and TO-3 packages
and with several fixed output voltages, making it
useful in a wide range of applications. These regu-
lators can provide local on-card regulation, eliminat-
ing the distribution problems associated with single
point regulation. Each type employs internal current
limiting, thermal shut-down and safe area protec-
tion, making it essentially indestructible. If adequate
heat sinking is provided, they can deliver over 2A
output current. Although designed primarily as fixed
voltage regulators, these devices can be used with
external components to obtain adjustable voltages
and currents.
TO-220
BLOCK DIAGRAM
TO-3
1/21
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Val ue
Unit
V
i
DC Input Voltage (for V
o
= 5 to 18V)
(for V
o
= 24V)
35
40
V
V
I
o
Output Current
Internally limited
P
t o t
Power Dissipation
Internally limited
T
s t g
Storage Temperature
65 to + 150
C
T
o p
Operating Junction Temperature (for L78S00 )
(for L78S00C )
55 to + 150
0 to + 150
C
C
THERMAL DATA
TO-220
TO-3
R
t h j- cas e
R
t h j -amb
Thermal Resistance Junction-case
Thermal Resistance Junction-ambient
Max
Max
3
50
4
35
C/W
C/W
CONNECTION DIAGRAMS AND ORDERING NUMBERS (top views)
Type
T O- 22 0
T O - 3
Output Voltage
L78S05
L78S05C
L78S75
L78S75C
L78S09
L78S09C
L78S10
L78S10C
L78S12
L78S12C
L78S15
L78S15C
L78S18
L78S18C
L78S24
L78S24C
L78S05CV
L78S75CV
L78S09CV
L78S10CV
L78S12CV
L78S15CV
L78S18CV
L78S24CV
L78S05T
L78S05CT
L78S75T
L78S75CT
L78S09T
L78S09CT
L78S10T
L78S10CT
L78S12T
L78S12CT
L78S15T
L78S15CT
L78S18T
L78S18CT
L78S24T
L78S24CT
5 V
5 V
7.5V
7.5V
9 V
9 V
10V
10V
12V
12V
15V
15V
18V
18V
24V
24V
L78S00 SERIES
2/21
APPLICATION CIRCUIT
SCHEMATIC DIAGRAM
L78S00 SERIES
3/21
TEST CIRCUITS
Figure 1 : DC Parameters.
Figure 2 : Load Regulation.
Figure 3 : Ripple Rejection.
L78S00 SERIES
4/21
ELECTRICAL CHARACTERISTICS FOR L78S05 (refer to the test circuits, T
j
= 25
o
C,
V
i
= 10V, I
o
= 500 mA unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
o
Output Voltage
4.8
5
5.2
V
V
o
Output Voltage
I
o
= 1 A
V
i
= 7 V
4.75
5
5.25
V
V
o
Line Regulation
V
i
= 7 to 25 V
V
i
= 8 to 25 V
100
50
mV
mV
V
o
Load Regulation
I
o
= 20 mA to 2 A
100
mV
I
d
Quiescent Current
8
mA
I
d
Quiescent Current Change
I
o
= 20 mA to 1A
0.5
mA
I
d
Quiescent Current Change
I
o
= 20 mA
V
i
= 7 to 25 V
1.3
mA
V
o
T
Output Voltage Drift
I
o
= 5 mA
T
j
= -55 to 150
o
C
-1.1
mV/
o
C
e
N
Output Noise Voltage
B = 10Hz to 100KHz
40
V
SVR
Supply Voltage Rejection
f = 120 Hz
60
dB
V
i
Operating Input Voltage
I
o
1.5 A
8
V
R
o
Output Resistance
f = 1KHz
17
m
I
sc
Short Circuit Current
V
i
= 27 V
500
mA
I
scp
Short Circuit Peack Current
3
A
ELECTRICAL CHARACTERISTICS FOR L78S75 (refer to the test circuits, T
j
= 25
o
C,
V
i
= 12.5V, I
o
= 500 mA unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
o
Output Voltage
7.15
7.5
7.9
V
V
o
Output Voltage
I
o
= 1 A
V
i
= 9.5 V
7.1
7.5
7.95
V
V
o
Line Regulation
V
i
= 9.5 to 25 V
V
i
= 10.5 to 20 V
120
60
mV
mV
V
o
Load Regulation
I
o
= 20 mA to 2 A
120
mV
I
d
Quiescent Current
8
mA
I
d
Quiescent Current Change
I
o
= 20 mA to 1A
0.5
mA
I
d
Quiescent Current Change
I
o
= 20 mA
V
i
= 9.5 to 25 V
1.3
mA
V
o
T
Output Voltage Drift
I
o
= 5 mA
T
j
= -55 to 150
o
C
-0.8
mV/
o
C
e
N
Output Noise Voltage
B = 10Hz to 100KHz
52
V
SVR
Supply Voltage Rejection
f = 120 Hz
54
dB
V
i
Operating Input Voltage
I
o
1.5 A
10.5
V
R
o
Output Resistance
f = 1KHz
16
m
I
sc
Short Circuit Current
V
i
= 27 V
500
mA
I
scp
Short Circuit Peack Current
3
A
L78S00 SERIES
5/21
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