1/20
September 2003
s
OUTPUT CURRENT IN EXCESS OF 1A
s
OUTPUT VOLTAGES OF 5; 6; 8; 9; 12; 15;
18; 20; 24V
s
THERMAL OVERLOAD PROTECTION
s
OUTPUT TRANSITION SOA PROTECTION
s
2% OUTPUT VOLTAGE TOLERANCE
s
GUARANTEED IN EXTENDED
TEMPERATURE RANGE
DESCRIPTION
The L7800A series of three terminal positive
regulators is available in TO-220, TO-220FP,
TO-220FM and D
2
PAK packages and several
fixed output voltages, making it useful in a wide
range of applications. These regulators can
provide local on-card regulation, eliminating the
distribution problem associated with single point
regulation. Each type employs internal current
limiting,
thermal
shut-down
and
safe
area
protection, making it essentially indestructible. If
adeguate heat sinking is provided, they can
deliver over 1A output current, Although designed
primarily
as
fixed
voltage
regulators,
these
devices can be used with external components to
obtain adjustable voltage and currents.
L7800AB/AC
SERIES
PRECISION 1A REGULATORS
SCHEMATIC DIAGRAM
TO-220
D
2
PAK
TO-220FM
TO-220FP
L7800AB/AC SERIES
2/20
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
THERMAL DATA
SHEMATIC DIAGRAM
Symbol
Parameter
Value
Unit
V
I
DC Input Voltage
(for V
O
= 5 to 18V)
(for V
O
= 20, 24V)
35
40
V
V
I
O
Output Current
Internally Limited
mA
P
D
Power Dissipation
Internally Limited
mW
T
stg
Storage Temperature Range
-65 to +150
C
T
op
Operating Junction Temperature Range (for L7800AC)
(for L7800AB)
0 to +150
-40 to +125
C
C
Symbol
Parameter
TO-220
TO-220FP
TO-220FM
D
2
PAK
Unit
R
thj-case
Thermal Resistance Junction-case
3
5
5
3
C/W
R
thj-amb
Thermal Resistance Junction-ambient
50
60
60
62.5
C/W
L7800AB/AC SERIES
3/20
CONNECTION DIAGRAM (top view)
ORDERING CODES
(*) Available in Tape & Reel with the suffix "-TR".
APPLICATION CIRCUITS
TYPE
TO-220
TO-220FP
TO-220FM
D
2
PAK (*)
OUTPUT
VOLTAGE
L7805AB
L7805ABV
L7805ABP
L7805ABF
L7805ABD2T
5 V
L7805AC
L7805ACV
L7805ACP
L7805ACF
L7805ACD2T
5 V
L7806AB
L7806ABV
L7806ABP
L7806ABF
L7806ABD2T
6 V
L7806AC
L7806ACV
L7806ACP
L7806ACF
L7806ACD2T
6 V
L7808AB
L7808ABV
L7808ABP
L7808ABF
L7808ABD2T
8 V
L7808AC
L7808ACV
L7808ACP
L7808ACF
L7808ACD2T
8 V
L7809AB
L7809ABV
L7809ABP
L7809ABF
L7809ABD2T
9 V
L7809AC
L7809ACV
L7809ACP
L7809ACF
L7809ACD2T
9 V
L7812AB
L7812ABV
L7812ABP
L7812ABF
L7812ABD2T
12 V
L7812AC
L7812ACV
L7812ACP
L7812ACF
L7812ACD2T
12 V
L7815AB
L7815ABV
L7815ABP
L7815ABF
L7815ABD2T
15 V
L7815AC
L7815ACV
L7815ACP
L7815ACF
L7815ACD2T
15 V
L7818AB
L7818ABV
L7818ABP
L7818ABF
L7818ABD2T
18 V
L7818AC
L7818ACV
L7818ACP
L7818ACF
L7818ACD2T
18 V
L7820AB
L7820ABV
L7820ABP
L7820ABF
L7820ABD2T
20 V
L7820AC
L7820ACV
L7820ACP
L7820ACF
L7820ACD2T
20 V
L7824AB
L7824ABV
L7824ABP
L7824ABF
L7824ABD2T
24 V
L7824AC
L7824ACV
L7824ACP
L7824ACF
L7824ACD2T
24 V
TO-220
TO-220FM
D
2
PAK
TO-220FP
L7800AB/AC SERIES
4/20
TEST CIRCUITS
Figure 1 : DC Parameter
Figure 2 : Load Regulation
Figure 3 : Ripple Rejection
L7800AB/AC SERIES
5/20
ELECTRICAL CHARACTERISTICS OF L7805A (V
I
=10V, I
O
=1A, T
J
= 0 to 150C (L7805AC),
T
J
= -40 to 125C (L7805AB), unless otherwise specified.)
(*) Load and Line Regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
T
J
= 25C
4.9
5
5.1
V
V
O
Output Voltage
I
O
= 5mA to 1A
P
O
15W
V
I
= 7.5 to 20V
4.8
5
5.2
V
V
O
(*)
Line Regulation
V
I
= 7.5 to 25V
I
O
= 500 mA
7
50
mV
V
I
= 8 to 12V
10
50
mV
V
I
= 8 to 12V
T
J
= 25C
2
25
mV
V
I
= 7.3 to 20V
T
J
= 25C
7
50
mV
V
O
(*)
Load Regulation
I
O
= 5mA to 1A
25
100
mV
I
O
= 5mA to 1.5A
T
J
= 25C
30
100
V
I
O
= 250 to 750mA
8
50
V
I
q
Quiescent Current
T
J
= 25C
4.3
6
mA
6
mA
I
q
Quiescent Current Change
V
I
= 8 to 25V
I
O
= 500 mA
0.8
mA
V
I
= 7.5 to 20V
T
J
= 25C
0.8
mA
I
O
= 5mA to 1A
0.5
mA
SVR
Supply Voltage Rejection
V
I
= 8 to 18V
f = 120Hz
I
O
= 500mA
68
dB
V
d
Dropout Voltage
I
O
= 1A
T
J
= 25C
2
V
eN
Output Noise Voltage
T
A
= 25C
B =10Hz to 100KHz
10
V/V
O
R
O
Output Resistance
f =1KHz
17
m
I
sc
Short Circuit Current
V
I
= 35V
T
A
= 25C
0.2
A
I
scp
Short Circuit Peak Current
T
J
= 25C
2.2
A
V
O
/
T Output Voltage Drift
-1.1
mv/C
L7800AB/AC SERIES
6/20
ELECTRICAL CHARACTERISTICS OF L7806A (V
I
=11V, I
O
=1A, T
J
= 0 to 150C (L7806AC),
T
J
= -40 to 125C (L7806AB), unless otherwise specified.)
(*) Load and Line Regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
T
J
= 25C
5.88
6
6.12
V
V
O
Output Voltage
I
O
= 5mA to 1A
P
O
15W
V
I
= 8.6 to 21V
5.76
6
6.24
V
V
O
(*)
Line Regulation
V
I
= 8.6 to 25V
I
O
= 500 mA
9
60
mV
V
I
= 9 to 13V
11
60
mV
V
I
= 9 to 13V
T
J
= 25C
3
30
mV
V
I
= 8.3 to 21V
T
J
= 25C
9
60
mV
V
O
(*)
Load Regulation
I
O
= 5mA to 1A
25
100
mV
I
O
= 5mA to 1.5A
T
J
= 25C
30
100
V
I
O
= 250 to 750mA
10
50
V
I
q
Quiescent Current
T
J
= 25C
4.3
6
mA
6
mA
I
q
Quiescent Current Change
V
I
= 9 to 25V
I
O
= 500 mA
0.8
mA
V
I
= 8.6 to 21V
T
J
= 25C
0.8
mA
I
O
= 5mA to 1A
0.5
mA
SVR
Supply Voltage Rejection
V
I
= 9 to 19V
f = 120Hz
I
O
= 500mA
65
dB
V
d
Dropout Voltage
I
O
= 1A
T
J
= 25C
2
V
eN
Output Noise Voltage
T
A
= 25C
B =10Hz to 100KHz
10
V/V
O
R
O
Output Resistance
f =1KHz
17
m
I
sc
Short Circuit Current
V
I
= 35V
T
A
= 25C
0.2
A
I
scp
Short Circuit Peak Current
T
J
= 25C
2.2
A
V
O
/
T Output Voltage Drift
-0.8
mV/C
L7800AB/AC SERIES
7/20
ELECTRICAL CHARACTERISTICS OF L7808A (V
I
=14V, I
O
=1A, T
J
= 0 to 150C (L7808AC),
T
J
= -40 to 125C (L7808AB), unless otherwise specified.)
(*) Load and Line Regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
T
J
= 25C
7.84
8
8.16
V
V
O
Output Voltage
I
O
= 5mA to 1A
P
O
15W
V
I
=10.6 to 23V
7.7
8
8.3
V
V
O
(*)
Line Regulation
V
I
= 10.6 to 25V
I
O
= 500 mA
12
80
mV
V
I
= 11 to 17V
15
80
mV
V
I
= 11 to 17V
T
J
= 25C
5
40
mV
V
I
= 10.4 to 23V
T
J
= 25C
12
80
mV
V
O
(*)
Load Regulation
I
O
= 5mA to 1A
25
100
mV
I
O
= 5mA to 1.5A
T
J
= 25C
30
100
V
I
O
= 250 to 750mA
10
50
V
I
q
Quiescent Current
T
J
= 25C
4.3
6
mA
6
mA
I
q
Quiescent Current Change
V
I
= 11 to 25V
I
O
= 500 mA
0.8
mA
V
I
= 10.6 to 23V
T
J
= 25C
0.8
mA
I
O
= 5mA to 1A
0.5
mA
SVR
Supply Voltage Rejection
V
I
= 11.5 to 21.5V
f = 120Hz
I
O
= 500mA
62
dB
V
d
Dropout Voltage
I
O
= 1A
T
J
= 25C
2
V
eN
Output Noise Voltage
T
A
= 25C
B =10Hz to 100KHz
10
V/V
O
R
O
Output Resistance
f =1KHz
18
m
I
sc
Short Circuit Current
V
I
= 35V
T
A
= 25C
0.2
A
I
scp
Short Circuit Peak Current
T
J
= 25C
2.2
A
V
O
/
T Output Voltage Drift
-0.8
mV/C
L7800AB/AC SERIES
8/20
ELECTRICAL CHARACTERISTICS OF L7809A (V
I
=15V, I
O
=1A, T
J
= 0 to 150C (L7809AC),
T
J
= -40 to 125C (L7809AB), unless otherwise specified.)
(*) Load and Line Regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
T
J
= 25C
8.82
9
9.18
V
V
O
Output Voltage
I
O
= 5mA to 1A
P
O
15W
V
I
=10.6 to 23V
8.65
9
9.35
V
V
O
(*)
Line Regulation
V
I
= 10.6 to 25V
I
O
= 500 mA
12
90
mV
V
I
= 11 to 17V
15
90
mV
V
I
= 11 to 17V
T
J
= 25C
5
45
mV
V
I
= 10.4 to 23V
T
J
= 25C
12
90
mV
V
O
(*)
Load Regulation
I
O
= 5mA to 1A
25
100
mV
I
O
= 5mA to 1.5A
T
J
= 25C
30
100
V
I
O
= 250 to 750mA
10
50
V
I
q
Quiescent Current
T
J
= 25C
4.3
6
mA
6
mA
I
q
Quiescent Current Change
V
I
= 11 to 25V
I
O
= 500 mA
0.8
mA
V
I
= 10.6 to 23V
T
J
= 25C
0.8
mA
I
O
= 5mA to 1A
0.5
mA
SVR
Supply Voltage Rejection
V
I
= 11.5 to 21.5V
f = 120Hz
I
O
= 500mA
61
dB
V
d
Dropout Voltage
I
O
= 1A
T
J
= 25C
2
V
eN
Output Noise Voltage
T
A
= 25C
B =10Hz to 100KHz
10
V/V
O
R
O
Output Resistance
f =1KHz
18
m
I
sc
Short Circuit Current
V
I
= 35V
T
A
= 25C
0.2
A
I
scp
Short Circuit Peak Current
T
J
= 25C
2.2
A
V
O
/
T Output Voltage Drift
-0.8
mV/C
L7800AB/AC SERIES
9/20
ELECTRICAL CHARACTERISTICS OF L7812A (V
I
=19V, I
O
=1A, T
J
= 0 to 150C (L7812AC),
T
J
= -40 to 125C (L7812AB), unless otherwise specified.)
(*) Load and Line Regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
T
J
= 25C
11.75
12
12.25
V
V
O
Output Voltage
I
O
= 5mA to 1A
P
O
15W
V
I
=14.8 to 27V
11.5
12
12.5
V
V
O
(*)
Line Regulation
V
I
= 14.8 to 30V
I
O
= 500 mA
13
120
mV
V
I
= 16 to 22V
16
120
mV
V
I
= 16 to 22V
T
J
= 25C
6
60
mV
V
I
= 14.5 to 27V
T
J
= 25C
13
120
mV
V
O
(*)
Load Regulation
I
O
= 5mA to 1A
25
100
mV
I
O
= 5mA to 1.5A
T
J
= 25C
30
100
V
I
O
= 250 to 750mA
10
50
V
I
q
Quiescent Current
T
J
= 25C
4.4
6
mA
6
mA
I
q
Quiescent Current Change
V
I
= 15 to 30V
I
O
= 500 mA
0.8
mA
V
I
= 14.8 to 27V
T
J
= 25C
0.8
mA
I
O
= 5mA to 1A
0.5
mA
SVR
Supply Voltage Rejection
V
I
= 15 to 25V
f = 120Hz
I
O
= 500mA
60
dB
V
d
Dropout Voltage
I
O
= 1A
T
J
= 25C
2
V
eN
Output Noise Voltage
T
A
= 25C
B =10Hz to 100KHz
10
V/V
O
R
O
Output Resistance
f =1KHz
18
m
I
sc
Short Circuit Current
V
I
= 35V
T
A
= 25C
0.2
A
I
scp
Short Circuit Peak Current
T
J
= 25C
2.2
A
V
O
/
T Output Voltage Drift
-1
mV/C
L7800AB/AC SERIES
10/20
ELECTRICAL CHARACTERISTICS OF L7815A (V
I
=23V, I
O
=1A, T
J
= 0 to 150C (L7815AC),
T
J
= -40 to 125C (L7815AB), unless otherwise specified.)
(*) Load and Line Regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
T
J
= 25C
14.7
15
15.3
V
V
O
Output Voltage
I
O
= 5mA to 1A
P
O
15W
V
I
= 17.9 to 30V
14.4
15
15.6
V
V
O
(*)
Line Regulation
V
I
= 17.9 to 30V
I
O
= 500 mA
13
150
mV
V
I
= 20 to 26V
16
150
mV
V
I
= 20 to 26V
T
J
= 25C
6
75
mV
V
I
= 17.5 to 30V
T
J
= 25C
13
150
mV
V
O
(*)
Load Regulation
I
O
= 5mA to 1A
25
100
mV
I
O
= 5mA to 1.5A
T
J
= 25C
30
100
V
I
O
= 250 to 750mA
10
50
V
I
q
Quiescent Current
T
J
= 25C
4.4
6
mA
6
mA
I
q
Quiescent Current Change
V
I
= 17.5 to 30V
I
O
= 500 mA
0.8
mA
V
I
= 17.5 to 30V
T
J
= 25C
0.8
mA
I
O
= 5mA to 1A
0.5
mA
SVR
Supply Voltage Rejection
V
I
= 18.5 to 28.5V
f = 120Hz
I
O
= 500mA
58
dB
V
d
Dropout Voltage
I
O
= 1A
T
J
= 25C
2
V
eN
Output Noise Voltage
T
A
= 25C
B =10Hz to 100KHz
10
V/V
O
R
O
Output Resistance
f =1KHz
19
m
I
sc
Short Circuit Current
V
I
= 35V
T
A
= 25C
0.2
A
I
scp
Short Circuit Peak Current
T
J
= 25C
2.2
A
V
O
/
T Output Voltage Drift
-1
mV/C
L7800AB/AC SERIES
11/20
ELECTRICAL CHARACTERISTICS OF L7818A (V
I
=27V, I
O
=1A, T
J
= 0 to 150C (L7818AC),
T
J
= -40 to 125C (L7818AB), unless otherwise specified.)
(*) Load and Line Regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
T
J
= 25C
17.64
18
18.36
V
V
O
Output Voltage
I
O
= 5mA to 1A
P
O
15W
V
I
= 21 to 33V
17.3
18
18.7
V
V
O
(*)
Line Regulation
V
I
= 21 to 33V
I
O
= 500 mA
25
180
mV
V
I
= 24 to 30V
28
180
mV
V
I
= 24 to 30V
T
J
= 25C
10
90
mV
V
I
= 20.6 to 33V
T
J
= 25C
5
180
mV
V
O
(*)
Load Regulation
I
O
= 5mA to 1A
25
100
mV
I
O
= 5mA to 1.5A
T
J
= 25C
30
100
V
I
O
= 250 to 750mA
10
50
V
I
q
Quiescent Current
T
J
= 25C
4.5
6
mA
6
mA
I
q
Quiescent Current Change
V
I
= 21 to 33V
I
O
= 500 mA
0.8
mA
V
I
= 21 to 33V
T
J
= 25C
0.8
mA
I
O
= 5mA to 1A
0.5
mA
SVR
Supply Voltage Rejection
V
I
= 22 to 32V
f = 120Hz
I
O
= 500mA
57
dB
V
d
Dropout Voltage
I
O
=1 A
T
J
= 25C
2
V
eN
Output Noise Voltage
T
A
= 25C
B =10Hz to 100KHz
10
V/V
O
R
O
Output Resistance
f =1KHz
19
m
I
sc
Short Circuit Current
V
I
= 35V
T
A
= 25C
0.2
A
I
scp
Short Circuit Peak Current
T
J
= 25C
2.2
A
V
O
/
T Output Voltage Drift
-1
mV/C
L7800AB/AC SERIES
12/20
ELECTRICAL CHARACTERISTICS OF L7820A (V
I
=28V, I
O
=1A, T
J
= 0 to 150C (L7820AC),
T
J
= -40 to 125C (L7820AB), unless otherwise specified.)
(*) Load and Line Regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
T
J
= 25C
19.6
20
20.4
V
V
O
Output Voltage
I
O
= 5mA to 1A
P
O
15W
V
I
= 23 to 35V
19.2
20
20.8
V
V
O
(*)
Line Regulation
V
I
= 23 to 35V
I
O
= 500 mA
200
mV
V
I
= 26 to 32V
200
mV
V
I
= 26 to 32V
T
J
= 25C
100
mV
V
I
= 23 to 32V
T
J
= 25C
200
mV
V
O
(*)
Load Regulation
I
O
= 5mA to 1A
25
100
mV
I
O
= 5mA to 1.5A
T
J
= 25C
30
100
V
I
O
= 250 to 750mA
10
50
V
I
q
Quiescent Current
T
J
= 25C
4.5
6
mA
6
mA
I
q
Quiescent Current Change
V
I
= 23 to 35V
I
O
= 500 mA
0.8
mA
V
I
= 23 to 35V
T
J
= 25C
0.8
mA
I
O
= 5mA to 1A
0.5
mA
SVR
Supply Voltage Rejection
V
I
= 24 to 35V
f = 120Hz
I
O
= 500mA
56
dB
V
d
Dropout Voltage
I
O
=1 A
T
J
= 25C
2
V
eN
Output Noise Voltage
T
A
= 25C
B =10Hz to 100KHz
10
V/V
O
R
O
Output Resistance
f =1KHz
20
m
I
sc
Short Circuit Current
V
I
= 35V
T
A
= 25C
0.2
A
I
scp
Short Circuit Peak Current
T
J
= 25C
2.2
A
V
O
/
T Output Voltage Drift
-1
mV/C
L7800AB/AC SERIES
13/20
ELECTRICAL CHARACTERISTICS OF L7824A (V
I
=33V, I
O
=1A, T
J
= 0 to 150C (L7824AC),
T
J
= -40 to 125C (L7824AB), unless otherwise specified.)
(*) Load and Line Regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
T
J
= 25C
23.5
24
24.5
V
V
O
Output Voltage
I
O
= 5mA to 1A
P
O
15W
V
I
= 27.3 to 38V
23
24
25
V
V
O
(*)
Line Regulation
V
I
= 27 to 38V
I
O
= 500 mA
31
240
mV
V
I
= 30 to 36V
35
240
mV
V
I
= 30 to 36V
T
J
= 25C
14
120
mV
V
I
= 26.7 to 38V
T
J
= 25C
31
240
mV
V
O
(*)
Load Regulation
I
O
= 5mA to 1A
25
100
mV
I
O
= 5mA to 1.5A
T
J
= 25C
30
100
V
I
O
= 250 to 750mA
10
50
V
I
q
Quiescent Current
T
J
= 25C
4.6
6
mA
6
mA
I
q
Quiescent Current Change
V
I
= 27.3 to 38V
I
O
= 500 mA
0.8
mA
V
I
= 27.3 to 38V
T
J
= 25C
0.8
mA
I
O
= 5mA to 1A
0.5
mA
SVR
Supply Voltage Rejection
V
I
= 28 to 38V
f = 120Hz
I
O
= 500mA
54
dB
V
d
Dropout Voltage
I
O
=1 A
T
J
= 25C
2
V
eN
Output Noise Voltage
T
A
= 25C
B =10Hz to 100KHz
10
V/V
O
R
O
Output Resistance
f =1KHz
20
m
I
sc
Short Circuit Current
V
I
= 35V
T
A
= 25C
0.2
A
I
scp
Short Circuit Peak Current
T
J
= 25C
2.2
A
V
O
/
T Output Voltage Drift
-1.5
mV/C
L7800AB/AC SERIES
14/20
APPLICATION INFORMATION
DESIGN CONSIDERATION
The L7800A Series of fixed voltage regulators are
designed with Thermal Overload Protection that
shuts down the circuit when subjected to an
excessive power overload condition, Internal
Short-circuit Protection that limits the maximum
current the circuit will pass, and Output transistor
Safe-Area Compensation that reduces the output
short-circuit current as the voltage across the pass
transistor is increased. In many low current
applications, compensation capacitors are not
required. However, it is recommended that the
regulator input be bypassed with capacitor if the
regulator is connected to the power supply filter
with long lengths, or if the output load capacitance
is large. An input bypass capacitor should be
selected
to
provide
good
high
frequency
characteristics to insure stable operation under all
load conditions. A 0.33mF or larger tantalum,
mylar or other capacitor having low internal
impedance at high frequencies should be chosen.
The bypass capacitor should be mounted with the
shortest
possible
leads
directly
across
the
regulators
input
terminals.
Normally
good
construction
techniques
should
be
used
to
minimize ground loops and lead resistance drops
since the regulator has no external sense lead.
The addition of an operational amplifier allows
adjustment to higher or intermediate values while
retaining regulation characteristics. The minimum
voltage obtained with the arrangement is 2V
greater than the regulator voltage.
The circuit of figure 6 can be modified to provide
supply protection against short circuit by adding a
short
circuit
sense
resistor,
RSC,
and
an
additional PNP transistor. The current sensing
PNP must be able to handle the short circuit
current of the three terminal regulator Therefore a
four ampere plastic power transistor is specified.
Figure 4 : DC Parameter
Figure 5 : DC Parameter
Figure 6 : DC Parameter
Figure 7 : DC Parameter
V
xx
I
O
=
+ I
d
R
1
V
O
, 7.0 to 20V
V
I
- V
O
2.0V
V
BEQ1
R
1
=
I
Q1
I
REQ
-
Q1
V
BEQ1
I
O
= I
REG
+ Q
1
(I
REG
)
R
1
L7800AB/AC SERIES
15/20
DIM.
mm.
inch
MIN.
TYP
MAX.
MIN.
TYP.
MAX.
A
4.40
4.60
0.173
0.181
C
1.23
1.32
0.048
0.051
D
2.40
2.72
0.094
0.107
D1
1.27
0.050
E
0.49
0.70
0.019
0.027
F
0.61
0.88
0.024
0.034
F1
1.14
1.70
0.044
0.067
F2
1.14
1.70
0.044
0.067
G
4.95
5.15
0.194
0.203
G1
2.4
2.7
0.094
0.106
H2
10.0
10.40
0.393
0.409
L2
16.4
0.645
L4
13.0
14.0
0.511
0.551
L5
2.65
2.95
0.104
0.116
L6
15.25
15.75
0.600
0.620
L7
6.2
6.6
0.244
0.260
L9
3.5
3.93
0.137
0.154
DIA.
3.75
3.85
0.147
0.151
TO-220 MECHANICAL DATA
P011C
L7800AB/AC SERIES
16/20
DIM.
mm.
inch
MIN.
TYP
MAX.
MIN.
TYP.
MAX.
A
4.40
4.60
0.173
0.181
B
2.5
2.7
0.098
0.106
D
2.5
2.75
0.098
0.108
E
0.45
0.70
0.017
0.027
F
0.75
1
0.030
0.039
F1
1.15
1.50
0.045
0.059
F2
1.15
1.50
0.045
0.059
G
4.95
5.2
0.194
0.204
G1
2.4
2.7
0.094
0.106
H
10.0
10.40
0.393
0.409
L2
16
0.630
L3
28.6
30.6
1.126
1.204
L4
9.8
10.6
0.385
0.417
L6
15.9
16.4
0.626
0.645
L7
9
9.3
0.354
0.366
DIA.
3
3.2
0.118
0.126
TO-220FP MECHANICAL DATA
L2
A
B
D
E
H
G
L6
F
L3
G1
1 2 3
F2
F1
L7
L4
7012510/G
L7800AB/AC SERIES
17/20
DIM.
mm.
inch
MIN.
TYP
MAX.
MIN.
TYP.
MAX.
A
4.50
4.90
0.177
0.193
B
3.04
3.44
0.120
0.135
D
2.56
2.96
0.101
0.117
E
0.45
0.50
0.60
0.018
0.020
0.024
F
0.70
0.90
0.028
0.035
F1
1.47
0.058
G
5.08
0.200
G1
2.34
2.54
2.74
0.092
0.100
0.108
H
9.96
10.36
0.392
0.408
L2
15.8
0.622
L4
9.45
10.05
0.372
0.396
L6
15.67
16.07
0.617
0.633
L7
8.99
9.39
0.354
0.370
L8
3.30
0.130
DIA.
3.08
3.28
0.121
0.129
TO-220FM MECHANICAL DATA
7012510C/G
L7800AB/AC SERIES
18/20
DIM.
mm.
inch
MIN.
TYP
MAX.
MIN.
TYP.
MAX.
A
4.4
4.6
0.173
0.181
A1
2.49
2.69
0.098
0.106
A2
0.03
0.23
0.001
0.009
B
0.7
0.93
0.027
0.036
B2
1.14
1.7
0.044
0.067
C
0.45
0.6
0.017
0.023
C2
1.23
1.36
0.048
0.053
D
8.95
9.35
0.352
0.368
D1
8
0.315
E
10
10.4
0.393
0.409
E1
8.5
0.335
G
4.88
5.28
0.192
0.208
L
15
15.85
0.590
0.624
L2
1.27
1.4
0.050
0.055
L3
1.4
1.75
0.055
0.068
M
2.4
3.2
0.094
0.126
R
0.4
0.016
V2
0
8
0
8
D
2
PAK MECHANICAL DATA
P011P6G
L7800AB/AC SERIES
19/20
DIM.
mm.
inch
MIN.
TYP
MAX.
MIN.
TYP.
MAX.
A
180
7.086
C
12.8
13.0
13.2
0.504
0.512
0.519
D
20.2
0.795
N
60
2.362
T
14.4
0.567
Ao
10.50
10.6
10.70
0.413
0.417
0.421
Bo
15.70
15.80
15.90
0.618
0.622
0.626
Ko
4.80
4.90
5.00
0.189
0.193
0.197
Po
3.9
4.0
4.1
0.153
0.157
0.161
P
11.9
12.0
12.1
0.468
0.472
0.476
Tape & Reel D
2
PAK-P
2
PAK-D
2
PAK/A-P
2
PAK/A MECHANICAL DATA
L7800AB/AC SERIES
20/20
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
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