©2006 Fairchild Semiconductor Corporation
1
www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
May 2006
LM78XX/LM78XXA
3-Terminal 1A Positive Voltage Regulator
Features
Output Current up to 1A
Output Voltages of 5, 6, 8, 9, 10, 12, 15, 18, 24
Thermal Overload Protection
Short Circuit Protection
Output Transistor Safe Operating Area Protection
General Description
The LM78XX series of three terminal positive regulators
are available in the TO-220 package and with several
fixed output voltages, making them useful in a wide
range of applications. Each type employs internal current
limiting, thermal shut down and safe operating area pro-
tection, making it essentially indestructible. If adequate
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 com-
ponents to obtain adjustable voltages and currents.
Ordering Information
Product Number Output Voltage Tolerance Package Operating Temperature
LM7805CT
±
4% TO-220 -40°C to +125°C
LM7806CT
LM7808CT
LM7809CT
LM7810CT
LM7812CT
LM7815CT
LM7818CT
LM7824CT
LM7805ACT
±
2% 0°C to +125°C
LM7806ACT
LM7808ACT
LM7809ACT
LM7810ACT
LM7812ACT
LM7815ACT
LM7818ACT
LM7824ACT
2
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LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Block Diagram
Figure 1.
Pin Assignment
Figure 2.
Absolute Maximum Ratings
Absolute maximum ratings are those values beyond which damage to the device may occur. The datasheet
specifications should be met, without exception, to ensure that the system design is reliable over its power supply,
temperature, and output/input loading variables. Fairchild does not recommend operation outside datasheet
specifications.
Symbol Parameter Value Unit
V
I
Input Voltage V
O
= 5V to 18V 35 V
V
O
= 24V 40 V
R
θ
JC
Thermal Resistance Junction-Cases (TO-220) 5 °C/W
R
θ
JA
Thermal Resistance Junction-Air (TO-220) 65 °C/W
T
OPR
Operating Temperature
Range
LM78xx -40 to +125 °C
LM78xxA 0 to +125
T
STG
Storage Temperature Range -65 to +150 °C
Starting
Circuit
Input
1
Reference
Voltage
Current
Generator
SOA
Protection
Thermal
Protection
Series Pass
Element
Error
Amplifier
Output
3
GND
2
1
1. Input
2. GND
3. Output
GND
TO-220
3
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LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Electrical Characteristics (LM7805)
Refer to the test circuits. -40°C
<
T
J
<
125°C, I
O
= 500mA, V
I
= 10V, C
I
= 0.1
µ
F, unless otherwise specified.
Notes:
1. 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 is used.
2. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Unit
V
O
Output Voltage T
J
= +25°C 4.8 5.0 5.2 V
5mA
I
O
1A, P
O
15W,
V
I
= 7V to 20V
4.75 5.0 5.25
Regline Line Regulation
(1)
T
J
= +25°C V
O
= 7V to 25V 4.0 100 mV
V
I
= 8V to 12V 1.6 50.0
Regload Load Regulation
(1)
T
J
= +25°C I
O
= 5mA to 1.5A 9.0 100 mV
I
O
= 250mA to 750mA 4.0 50.0
I
Q
Quiescent Current T
J
= +25°C 5.0 8.0 mA
I
Q
Quiescent Current Change I
O
= 5mA to 1A 0.03 0.5 mA
V
I
= 7V to 25V 0.3 1.3
V
O
/
TOutput Voltage Drift
(2)
I
O
= 5mA -0.8 mV/°C
V
N
Output Noise Voltage f = 10Hz to 100kHz, T
A
= +25°C 42.0
µ
V/V
O
RR Ripple Rejection
(2)
f = 120Hz, V
O
= 8V to 18V 62.0 73.0 dB
V
DROP
Dropout Voltage I
O
= 1A, T
J
= +25°C 2.0 V
r
O
Output Resistance
(2)
f = 1kHz 15.0 m
I
SC
Short Circuit Current V
I
= 35V, T
A
= +25°C 230 mA
I
PK
Peak Current
(2)
T
J
= +25°C 2.2 A
4
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LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Electrical Characteristics (LM7806)
(Continued)
Refer to the test circuits. -40°C
<
T
J
<
125°C, I
O
= 500mA, V
I
= 11V, C
I
= 0.33
µ
F, C
O
= 0.1
µ
F, unless otherwise specified.
Notes:
3. 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 is used.
4. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min Typ. Max. Unit
V
O
Output Voltage T
J
= +25°C 5.75 6.0 6.25 V
5mA
I
O
1A, P
O
15W,
V
I
= 8.0V to 21V
5.7 6.0 6.3
Regline Line Regulation
(3)
T
J
= +25°C V
I
= 8V to 25V 5.0 120 mV
V
I
= 9V to 13V 1.5 60.0
Regload Load Regulation
(3)
T
J
= +25°C I
O
= 5mA to 1.5A 9.0 120 mV
I
O
= 250mA to 750mA 3.0 60.0
I
Q
Quiescent Current T
J
= +25°C 5.0 8.0 mA
I
Q
Quiescent Current
Change
I
O
= 5mA to 1A 0.5 mA
V
I
= 8V to 25V 1.3
V
O
/
TOutput Voltage Drift
(4)
I
O
= 5mA -0.8 mV/°C
V
N
Output Noise Voltage f = 10Hz to 100kHz, T
A
= +25°C 45.0
µ
V/V
O
RR Ripple Rejection
(4)
f = 120Hz, V
O
= 8V to 18V 62.0 73.0 dB
VDROP Dropout Voltage IO = 1A, TJ = +25°C 2.0 V
rOOutput Resistance(4) f = 1kHz 19.0 m
ISC Short Circuit Current VI = 35V, TA = +25°C 250 mA
IPK Peak Current(4) TJ = +25°C 2.2 A
5www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Electrical Characteristics (LM7808) (Continued)
Refer to the test circuits. -40°C < TJ < 125°C, IO = 500mA, VI = 14V, CI = 0.33µF, C O = 0.1µF, unless otherwise specified.
Notes:
5. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
6. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Unit
VOOutput Voltage TJ = +25°C 7.7 8.0 8.3 V
5mA IO 1A, PO 15W,
VI = 10.5V to 23V
7.6 8.0 8.4
Regline Line Regulation(5) TJ = +25°C VI = 10.5V to 25V 5.0 160 mV
VI = 11.5V to 17V 2.0 80.0
Regload Load Regulation(5) TJ = +25°C IO = 5mA to 1.5A 10.0 160 mV
IO = 250mA to 750mA 5.0 80.0
IQQuiescent Current TJ = +25°C 5.0 8.0 mA
IQQuiescent Current Change IO = 5mA to 1A 0.05 0.5 mA
VI = 10.5V to 25V 0.5 1.0
VO/TOutput Voltage Drift(6) IO = 5mA -0.8 mV/°C
VNOutput Noise Voltage f = 10Hz to 100kHz, T
A = +25°C 52.0 µV/VO
RR Ripple Rejection(6) f = 120Hz, VO = 11.5V to 21.5V 56.0 73.0 dB
VDROP Dropout Voltage IO = 1A, TJ = +25°C 2.0 V
rOOutput Resistance(6) f = 1kHz 17.0 m
ISC Short Circuit Current VI = 35V, TA = +25°C 230 mA
IPK Peak Current(6) TJ = +25°C 2.2 A
6www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Electrical Characteristics (LM7809) (Continued)
Refer to the test circuits. -40°C < TJ < 125°C, IO = 500mA, VI = 15V, CI = 0.33µF, C O = 0.1µF, unless otherwise specified.
Notes:
7. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
8. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Unit
VOOutput Voltage TJ = +25°C 8.65 9.0 9.35 V
5mA IO 1A, PO 15W,
VI = 11.5V to 24V
8.6 9.0 9.4
Regline Line Regulation(7) TJ = +25°C VI = 11.5V to 25V 6.0 180 mV
VI = 12V to 17V 2.0 90.0
Regload Load Regulation(7) T
J = +25°C IO = 5mA to 1.5A 12.0 180 mV
IO = 250mA to 750mA 4.0 90.0
IQQuiescent Current TJ = +25°C 5.0 8.0 mA
IQQuiescent Current Change IO = 5mA to 1A 0.5 mA
VI = 11.5V to 26V 1.3
VO/TOutput Voltage Drift(8) IO = 5mA -1.0 mV/°C
VNOutput Noise Voltage f = 10Hz to 100kHz, T
A = +25°C 58.0 µV/VO
RR Ripple Rejection(8) f = 120Hz, VO = 13V to 23V 56.0 71.0 dB
VDROP Dropout Voltage IO = 1A, TJ = +25°C 2.0 V
rOOutput Resistance(8) f = 1kHz 17.0 m
ISC Short Circuit Current VI = 35V, TA = +25°C 250 mA
IPK Peak Current(8) TJ = +25°C 2.2 A
7www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Electrical Characteristics (LM7810) (Continued)
Refer to the test circuits. -40°C < TJ < 125°C, IO = 500mA, VI = 16V, CI = 0.33µF, C O = 0.1µF, unless otherwise specified.
Notes:
9. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
10. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Unit
VOOutput Voltage TJ = +25°C 9.6 10.0 10.4 V
5mA IO 1A, PO 15W,
VI = 12.5V to 25V
9.5 10.0 10.5
Regline Line Regulation(9) TJ = +25°C VI = 12.5V to 25V 10.0 200 mV
VI = 13V to 25V 3.0 100
Regload Load Regulation(9) TJ = +25°C IO = 5mA to 1.5A 12.0 200 mV
IO = 250mA to 750mA 4.0 400
IQQuiescent Current TJ = +25°C 5.1 8.0 mA
IQQuiescent Current Change IO = 5mA to 1A 0.5 mA
VI = 12.5V to 29V 1.0
VO/TOutput Voltage Drift(10) IO = 5mA -1.0 mV/°C
VNOutput Noise Voltage f = 10Hz to 100kHz, T
A = +25°C 58.0 µV/VO
RR Ripple Rejection(10) f = 120Hz, VO = 13V to 23V 56.0 71.0 dB
VDROP Dropout Voltage IO = 1A, TJ = +25°C 2.0 V
rOOutput Resistance(10) f = 1kHz 17.0 m
ISC Short Circuit Current VI = 35V, TA = +25°C 250 mA
IPK Peak Current(10) TJ = +25°C 2.2 A
8www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Electrical Characteristics (LM7812) (Continued)
Refer to the test circuits. -40°C < TJ < 125°C, IO = 500mA, VI = 19V, CI = 0.33µF, C O = 0.1µF, unless otherwise specified.
Notes:
11. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
12. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Unit
VOOutput Voltage TJ = +25°C 11.5 12.0 12.5 V
5mA IO 1A, PO 15W,
VI = 14.5V to 27V
11.4 12.0 12.6
Regline Line Regulation(11) TJ = +25°C VI = 14.5V to 30V 10.0 240 mV
VI = 16V to 22V 3.0 120
Regload Load Regulation(11) TJ = +25°C IO = 5mA to 1.5A 11.0 240 mV
IO = 250mA to 750mA 5.0 120
IQQuiescent Current TJ = +25°C 5.1 8.0 mA
IQQuiescent Current Change IO = 5mA to 1A 0.1 0.5 mA
VI = 14.5V to 30V 0.5 1.0
VO/TOutput Voltage Drift(12) IO = 5mA -1.0 mV/°C
VNOutput Noise Voltage f = 10Hz to 100kHz, T
A = +25°C 76.0 µV/VO
RR Ripple Rejection(12) f = 120Hz, VI = 15V to 25V 55.0 71.0 dB
VDROP Dropout Voltage IO = 1A, TJ = +25°C 2.0 V
rOOutput Resistance(12) f = 1kHz 18.0 m
ISC Short Circuit Current VI = 35V, TA = +25°C 230 mA
IPK Peak Current(12) TJ = +25°C 2.2 A
9www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Electrical Characteristics (LM7815) (Continued)
Refer to the test circuits. -40°C < TJ < 125°C, IO = 500mA, VI = 23V, CI = 0.33µF, C O = 0.1µF, unless otherwise specified.
Notes:
13. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
14. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Unit
VOOutput Voltage TJ = +25°C 14.4 15.0 15.6 V
5mA IO 1A, PO 15W,
VI = 17.5V to 30V
14.25 15.0 15.75
Regline Line Regulation(13) TJ = +25°C VI = 17.5V to 30V 11.0 300 mV
VI = 20V to 26V 3.0 150
Regload Load Regulation(13) TJ = +25°C IO = 5mA to 1.5A 12.0 300 mV
IO = 250mA to 750mA 4.0 150
IQQuiescent Current TJ = +25°C 5.2 8.0 mA
IQQuiescent Current Change IO = 5mA to 1A 0.5 mA
VI = 17.5V to 30V 1.0
VO/TOutput Voltage Drift(14) IO = 5mA -1.0 mV/°C
VNOutput Noise Voltage f = 10Hz to 100kHz, T
A = +25°C 90.0 µV/VO
RR Ripple Rejection(14) f = 120Hz, VI = 18.5V to 28.5V 54.0 70.0 dB
VDROP Dropout Voltage IO = 1A, TJ = +25°C 2.0 V
rOOutput Resistance(14) f = 1kHz 19.0 m
ISC Short Circuit Current VI = 35V, TA = +25°C 250 mA
IPK Peak Current(14) TJ = +25°C 2.2 A
10 www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Electrical Characteristics (LM7818) (Continued)
Refer to the test circuits. -40°C < TJ < 125°C, IO = 500mA, VI = 27V, CI = 0.33µF, C O = 0.1µF, unless otherwise specified.
Notes:
15. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
16. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Unit
VOOutput Voltage TJ = +25°C 17.3 18.0 18.7 V
5mA IO 1A, PO 15W,
VI = 21V to 33V
17.1 18.0 18.9
Regline Line Regulation(15) TJ = +25°C VI = 21V to 33V 15.0 360 mV
VI = 24V to 30V 5.0 180
Regload Load Regulation(15) TJ = +25°C IO = 5mA to 1.5A 15.0 360 mV
IO = 250mA to 750mA 5.0 180
IQQuiescent Current TJ = +25°C 5.2 8.0 mA
IQQuiescent Current Change IO = 5mA to 1A 0.5 mA
VI = 21V to 33V 1.0
VO/TOutput Voltage Drift(16) IO = 5mA -1.0 mV/°C
VNOutput Noise Voltage f = 10Hz to 100kHz, T
A = +25°C 110 µV/VO
RR Ripple Rejection(16) f = 120Hz, VI = 22V to 32V 53.0 69.0 dB
VDROP Dropout Voltage IO = 1A, TJ = +25°C 2.0 V
rOOutput Resistance(16) f = 1kHz 22.0 m
ISC Short Circuit Current VI = 35V, TA = +25°C 250 mA
IPK Peak Current(16) TJ = +25°C 2.2 A
11 www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Electrical Characteristics (LM7824) (Continued)
Refer to the test circuits. -40°C < TJ < 125°C, IO = 500mA, VI = 33V, CI = 0.33µF, C O = 0.1µF, unless otherwise specified.
Notes:
17. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
18. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Unit
VOOutput Voltage TJ = +25°C 23.0 24.0 25.0 V
5mA IO 1A, PO 15W,
VI = 27V to 38V
22.8 24.0 25.25
Regline Line Regulation(17) TJ = +25°C VI = 27V to 38V 17.0 480 mV
VI = 30V to 36V 6.0 240
Regload Load Regulation(17) TJ = +25°C IO = 5mA to 1.5A 15.0 480 mV
IO = 250mA to 750mA 5.0 240
IQQuiescent Current TJ = +25°C 5.2 8.0 mA
IQQuiescent Current Change IO = 5mA to 1A 0.1 0.5 mA
VI = 27V to 38V 0.5 1.0
VO/TOutput Voltage Drift(18) IO = 5mA -1.5 mV/°C
VNOutput Noise Voltage f = 10Hz to 100kHz, T
A = +25°C 60.0 µV/VO
RR Ripple Rejection(18) f = 120Hz, VI = 28V to 38V 50.0 67.0 dB
VDROP Dropout Voltage IO = 1A, TJ = +25°C 2.0 V
rO Output Resistance(18) f = 1kHz 28.0 m
ISC Short Circuit Current VI = 35V, TA = +25°C 230 mA
IPK Peak Current(18) TJ = +25°C 2.2 A
12 www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Electrical Characteristics (LM7805A) (Continued)
Refer to the test circuits. 0°C < TJ < 125°C, IO = 1A, VI = 10V, CI = 0.33µF, C O = 0.1µF, unless otherwise specified.
Notes:
19. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
20. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Unit
VOOutput Voltage TJ = +25°C 4.9 5.0 5.1 V
IO = 5mA to 1A, PO 15W,
VI = 7.5V to 20V
4.8 5.0 5.2
Regline Line Regulation(19) VI = 7.5V to 25V, IO = 500mA 5.0 50.0 mV
VI = 8V to 12V 3.0 50.0
TJ = +25°C VI = 7.3V to 20V 5.0 50.0
VI = 8V to 12V 1.5 25.0
Regload Load Regulation(19) TJ = +25°C, IO = 5mA to 1.5A 9.0 100 mV
IO = 5mA to 1A 9.0 100
IO = 250mA to 750mA 4.0 50.0
IQQuiescent Current TJ = +25°C 5.0 6.0 mA
IQQuiescent Current
Change
IO = 5mA to 1A 0.5 mA
VI = 8V to 25V, IO = 500mA 0.8
VI = 7.5V to 20V, TJ = +25°C 0.8
VO/TOutput Voltage Drift(20) IO = 5mA -0.8 mV/°C
VNOutput Noise Voltage f = 10Hz to 100kHz, T
A = +25°C 10.0 µV/VO
RR Ripple Rejection(20) f = 120Hz, IO = 500mA, VI = 8V to 18V 68.0 dB
VDROP Dropout Voltage IO = 1A, TJ = +25°C 2.0 V
rOOutput Resistance(20) f = 1kHz 17.0 m
ISC Short Circuit Current VI = 35V, TA = +25°C 250 mA
IPK Peak Current(20) TJ = +25°C 2.2 A
13 www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Electrical Characteristics (LM7806A) (Continued)
Refer to the test circuits. 0°C < TJ < 125°C, IO = 1A, VI = 11V, CI = 0.33µF, C O = 0.1µF, unless otherwise specified.
Notes:
21. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
22. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Unit
VOOutput Voltage TJ = +25°C 5.58 6.0 6.12 V
IO = 5mA to 1A, PO 15W,
VI = 8.6V to 21V
5.76 6.0 6.24
Regline Line Regulation(21) VI = 8.6V to 25V, IO = 500mA 5.0 60.0 mV
VI = 9V to 13V 3.0 60.0
TJ = +25°C VI = 8.3V to 21V 5.0 60.0
VI = 9V to 13V 1.5 30.0
Regload Load Regulation(21) TJ = +25°C, IO = 5mA to 1.5A 9.0 100 mV
IO = 5mA to 1A 9.0 100
IO = 250mA to 750mA 5.0 50.0
IQQuiescent Current TJ = +25°C 4.3 6.0 mA
IQQuiescent Current Change IO = 5mA to 1A 0.5 mA
VI = 19V to 25V, IO = 500mA 0.8
VI = 8.5V to 21V, TJ = +25°C 0.8
VO/TOutput Voltage Drift(22) IO = 5mA -0.8 mV/°C
VNOutput Noise Voltage f = 10Hz to 100kHz, T
A = +25°C 10.0 µV/VO
RR Ripple Rejection(22) f = 120Hz, IO = 500mA, VI = 9V to 19V 65.0 dB
VDROP Dropout Voltage IO = 1A, TJ = +25°C 2.0 V
rOOutput Resistance(22) f = 1kHz 17.0 m
ISC Short Circuit Current VI = 35V, TA = +25°C 250 mA
IPK Peak Current(22) TJ = +25°C 2.2 A
14 www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Electrical Characteristics (LM7808A) (Continued)
Refer to the test circuits. 0°C < TJ < 125°C, IO = 1A, VI = 14V, CI = 0.33µF, C O = 0.1µF, unless otherwise specified.
Notes:
23. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
24. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Unit
VOOutput Voltage TJ = +25°C 7.84 8.0 8.16 V
IO = 5mA to 1A, PO 15W,
VI = 10.6V to 23V
7.7 8.0 8.3
Regline Line Regulation(23) VI = 10.6V to 25V, IO = 500mA 6.0 80.0 mV
VI = 11V to 17V 3.0 80.0
TJ = +25°C VI = 10.4V to 23V 6.0 80.0
VI = 11V to 17V 2.0 40.0
Regload Load Regulation(23) TJ = +25°C, IO = 5mA to 1.5A 12.0 100 mV
IO = 5mA to 1A 12.0 100
IO = 250mA to 750mA 5.0 50.0
IQQuiescent Current TJ = +25°C 5.0 6.0 mA
IQQuiescent Current Change IO = 5mA to 1A 0.5 mA
VI = 11V to 25V, IO = 500mA 0.8
VI = 10.6V to 23V, TJ = +25°C 0.8
VO/TOutput Voltage Drift(24) IO = 5mA -0.8 mV/°C
VNOutput Noise Voltage f = 10Hz to 100kHz, T
A = +25°C 10.0 µV/VO
RR Ripple Rejection(24) f = 120Hz, IO = 500mA,
VI = 11.5V to 21.5V
62.0 dB
VDROP Dropout Voltage IO = 1A, TJ = +25°C 2.0 V
rOOutput Resistance(24) f = 1kHz 18.0 m
ISC Short Circuit Current VI = 35V, TA = +25°C 250 mA
IPK Peak Current(24) TJ = +25°C 2.2 A
15 www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Electrical Characteristics (LM7809A) (Continued)
Refer to the test circuits. 0°C < TJ < 125°C, IO = 1A, VI = 15V, CI = 0.33µF, C O = 0.1µF, unless otherwise specified.
Notes:
25. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
26. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Units
VOOutput Voltage TJ = +25°C 8.82 9.0 9.16 V
IO = 5mA to 1A, PO 15W,
VI = 11.2V to 24V
8.65 9.0 9.35
Regline Line Regulation(25) VI = 11.7V to 25V, IO = 500mA 6.0 90.0 mV
VI = 12.5V to 19V 4.0 45.0
TJ = +25°C VI = 11.5V to 24V 6.0 90.0
VI = 12.5V to 19V 2.0 45.0
Regload Load Regulation(25) TJ = +25°C, IO = 5mA to 1.5A 12.0 100 mV
IO = 5mA to 1A 12.0 100
IO = 250mA to 750mA 5.0 50.0
IQQuiescent Current TJ = +25°C 5.0 6.0 mA
IQQuiescent Current Change IO = 5mA to 1A 0.5 mA
VI = 12V to 25V, IO = 500mA 0.8
VI = 11.7V to 25V, TJ = +25°C 0.8
VO/TOutput Voltage Drift(26) IO = 5mA -1.0 mV/°C
VNOutput Noise Voltage f = 10Hz to 100kHz, T
A = +25°C 10.0 µV/VO
RR Ripple Rejection(26) f = 120Hz, IO = 500mA,
VI = 12V to 22V
62.0 dB
VDROP Dropout Voltage IO = 1A, TJ = +25°C 2.0 V
rOOutput Resistance(26) f = 1kHz 17.0 m
ISC Short Circuit Current VI = 35V, TA = +25°C 250 mA
IPK Peak Current(26) TJ = +25°C 2.2 A
16 www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Electrical Characteristics (LM7810A) (Continued)
Refer to the test circuits. 0°C < TJ < 125°C, IO = 1A, VI = 16V, CI = 0.33µF, C O = 0.1µF, unless otherwise specified.
Notes:
27. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
28. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Units
VOOutput Voltage TJ = +25°C 9.8 10.0 10.2 V
IO = 5mA to 1A, PO 15W,
VI = 12.8V to 25V
9.6 10.0 10.4
Regline Line Regulation(27) VI = 12.8V to 26V, IO = 500mA 8.0 100 mV
VI = 13V to 20V 4.0 50.0
TJ = +25°C VI = 12.5V to 25V 8.0 100
VI = 13V to 20V 3.0 50.0
Regload Load Regulation(27) TJ = +25°C, IO = 5mA to 1.5A 12.0 100 mV
IO = 5mA to 1A 12.0 100
IO = 250mA to 750mA 5.0 50.0
IQQuiescent Current TJ = +25°C 5.0 6.0 mA
IQQuiescent Current
Change
IO = 5mA to 1A 0.5 mA
VI = 12.8V to 25V, IO = 500mA 0.8
VI = 13V to 26V, TJ = +25°C 0.5
VO/TOutput Voltage Drift(28) IO = 5mA -1.0 mV/°C
VNOutput Noise Voltage f = 10Hz to 100kHz, T
A = +25°C 10.0 µV/VO
RR Ripple Rejection(28) f = 120Hz, IO = 500mA, VI = 14V to 24V 62.0 dB
VDROP Dropout Voltage IO = 1A, TJ = +25°C 2.0 V
rOOutput Resistance(28) f = 1kHz 17.0 m
ISC Short Circuit Current VI = 35V, TA = +25°C 250 mA
IPK Peak Current(28) TJ = +25°C 2.2 A
17 www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Electrical Characteristics (LM7812A) (Continued)
Refer to the test circuits. 0°C < TJ < 125°C, IO = 1A, VI = 19V, CI = 0.33µF, C O = 0.1µF, unless otherwise specified.
Note:
29. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
30. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Units
VOOutput Voltage TJ = +25°C 11.75 12.0 12.25 V
IO = 5mA to 1A, PO 15W,
VI = 14.8V to 27V
11.5 12.0 12.5
Regline Line Regulation(29) VI = 14.8V to 30V, IO = 500mA 10.0 120 mV
VI = 16V to 22V 4.0 120
TJ = +25°C VI = 14.5V to 27V 10.0 120
VI = 16V to 22V 3.0 60.0
Regload Load Regulation(29) TJ = +25°C, IO = 5mA to 1.5A 12.0 100 mV
IO = 5mA to 1A 12.0 100
IO = 250mA to 750mA 5.0 50.0
IQQuiescent Current TJ = +25°C 5.1 6.0 mA
IQQuiescent Current Change IO = 5mA to 1A 0.5 mA
VI = 14V to 27V, IO = 500mA 0.8
VI = 15V to 30V, TJ = +25°C 0.8
VO/TOutput Voltage Drift(30) IO = 5mA -1.0 mV/°C
VNOutput Noise Voltage f = 10Hz to 100kHz, T
A = +25°C 10.0 µV/VO
RR Ripple Rejection(30) f = 120Hz, IO = 500mA,
VI = 14V to 24V
60.0 dB
VDROP Dropout Voltage IO = 1A, TJ = +25°C 2.0 V
rOOutput Resistance(30) f = 1kHz 18.0 m
ISC Short Circuit Current VI = 35V, TA = +25°C 250 mA
IPK Peak Current(30) TJ = +25°C 2.2 A
18 www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Electrical Characteristics (LM7815A) (Continued)
Refer to the test circuits. 0°C < TJ < 125°C, IO = 1A, VI = 23V, CI = 0.33µF, C O = 0.1µF, unless otherwise specified.
Notes:
31. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
32. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Units
VOOutput Voltage TJ = +25°C 14.75 15.0 15.3 V
IO = 5mA to 1A, PO 15W,
VI = 17.7V to 30V
14.4 15.0 15.6
Regline Line Regulation(31) VI = 17.4V to 30V, IO = 500mA 10.0 150 mV
VI = 20V to 26V 5.0 150
TJ = +25°C VI = 17.5V to 30V 11.0 150
VI = 20V to 26V 3.0 75.0
Regload Load Regulation(31) TJ = +25°C, IO = 5mA to 1.5A 12.0 100 mV
IO = 5mA to 1A 12.0 100
IO = 250mA to 750mA 5.0 50.0
IQQuiescent Current TJ = +25°C 5.2 6.0 mA
IQQuiescent Current Change IO = 5mA to 1A 0.5 mA
VI = 17.5V to 30V, IO = 500mA 0.8
VI = 17.5V to 30V, TJ = +25°C 0.8
VO/TOutput Voltage Drift(32) IO = 5mA -1.0 mV/°C
VNOutput Noise Voltage f = 10Hz to 100kHz, T
A = +25°C 10.0 µV/VO
RR Ripple Rejection(32) f = 120Hz, IO = 500mA,
VI = 18.5V to 28.5V
58.0 dB
VDROP Dropout Voltage IO = 1A, TJ = +25°C 2.0 V
rOOutput Resistance(32) f = 1kHz 19.0 m
ISC Short Circuit Current VI = 35V, TA = +25°C 250 mA
IPK Peak Current(32) TJ = +25°C 2.2 A
19 www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Electrical Characteristics (LM7818A) (Continued)
Refer to the test circuits. 0°C < TJ < 125°C, IO = 1A, VI = 27V, CI = 0.33µF, C O = 0.1µF, unless otherwise specified.
Notes:
33. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
34. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Units
VOOutput Voltage TJ = +25°C 17.64 18.0 18.36 V
IO = 5mA to 1A, PO 15W,
VI = 21V to 33V
17.3 18.0 18.7
Regline Line Regulation(33) VI = 21V to 33V, IO = 500mA 15.0 180 mV
VI = 21V to 33V 5.0 180
TJ = +25°C VI = 20.6V to 33V 15.0 180
VI = 24V to 30V 5.0 90.0
Regload Load Regulation(33) TJ = +25°C, IO = 5mA to 1.5A 15.0 100 mV
IO = 5mA to 1A 15.0 100
IO = 250mA to 750mA 7.0 50.0
IQQuiescent Current TJ = +25°C 5.2 6.0 mA
IQQuiescent Current Change IO = 5mA to 1A 0.5 mA
VI = 12V to 33V, IO = 500mA 0.8
VI = 12V to 33V, TJ = +25°C 0.8
VO/TOutput Voltage Drift(34) IO = 5mA -1.0 mV/°C
VNOutput Noise Voltage f = 10Hz to 100kHz, T
A = +25°C 10.0 µV/VO
RR Ripple Rejection(34) f = 120Hz, IO = 500mA,
VI = 22V to 32V
57.0 dB
VDROP Dropout Voltage IO = 1A, TJ = +25°C 2.0 V
rOOutput Resistance(34) f = 1kHz 19.0 m
ISC Short Circuit Current VI = 35V, TA = +25°C 250 mA
IPK Peak Current(34) TJ = +25°C 2.2 A
20 www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Electrical Characteristics (LM7824A) (Continued)
Refer to the test circuits. 0°C < TJ < 125°C, IO = 1A, VI = 33V, CI = 0.33µF, C O = 0.1µF, unless otherwise specified.
Notes:
35. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
36. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Units
VOOutput Voltage TJ = +25°C 23.5 24.0 24.5 V
IO = 5mA to 1A, PO 15W,
VI = 27.3V to 38V
23.0 24.0 25.0
Regline Line Regulation(35) VI = 27V to 38V, IO = 500mA 18.0 240 mV
VI = 21V to 33V 6.0 240
TJ = +25°C VI = 26.7V to 38V 18.0 240
VI = 30V to 36V 6.0 120
Regload Load Regulation(35) TJ = +25°C, IO = 5mA to 1.5A 15.0 100 mV
IO = 5mA to 1A 15.0 100
IO = 250mA to 750mA 7.0 50.0
IQQuiescent Current TJ = +25°C 5.2 6.0 mA
IQQuiescent Current Change IO = 5mA to 1A 0.5 mA
VI = 27.3V to 38V, IO = 500mA 0.8
VI = 27.3V to 38V, TJ = +25°C 0.8
VO/TOutput Voltage Drift(36) IO = 5mA -1.5 mV/°C
VNOutput Noise Voltage f = 10Hz to 100kHz, T
A = +25°C 10.0 µV/VO
RR Ripple Rejection(36) f = 120Hz, IO = 500mA,
VI = 28V to 38V
54.0 dB
VDROP Dropout Voltage IO = 1A, TJ = +25°C 2.0 V
rOOutput Resistance(36) f = 1kHz 20.0 m
ISC Short Circuit Current VI = 35V, TA = +25°C 250 mA
IPK Peak Current(36) TJ = +25°C 2.2 A
21 www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Typical Performance Characteristics
Figure 3. Quiescent Current Figure 4. Peak Output Current
Figure 5. Output Voltage Figure 6. Quiescent Current
6
5.75
5.5
5.25
5
4.75
4.5
VI = 10V
VO = 5V
IO = 5mA
-25-50 0 025 50 75 100 125
QUIESCENT CURRENT (mA)
JUNCTION TEMPERATURE (°C)
3
2.5
2
1.5
1
.5
0
TJ = 25°C
VO = 100mV
5101520253035
OUTPUT CURRENT (A)
INPUT-OUTPUT DIFFERENTIAL (V)
1.02
1.01
1
0.99
0.98
VI – VO = 5V
IO = 5mA
-25-50 0 25 50 75 100 125
NORMALIZED OUTPUT VOLTAGE (V)
JUNCTION TEMPERATURE (°C)
7
6.5
6
5.5
5
4.5
4
TJ = 25°C
VO = 5V
IO = 10mA
1051520253035
QUIESCENT CURRENT (mA)
INPUT VOLTAGE (V)
22 www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Typical Applications
Figure 7. DC Parameters
Figure 8. Load Regulation
Figure 9. Ripple Rejection
0.1µF
CO
CI0.33µF
Output
Input LM78XX
13
2
LM78XX 3
2
1
0.33µF
270pF
10030µS
RL
2N6121
or EQ
Output
Input
VO
0V
VO
LM78XX
Output
Input
5.1
0.33µF 2
31
RL
470µF
120Hz +
23 www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Figure 10. Fixed Output Regulator
Figure 11.
Figure 12. Circuit for Increasing Output Voltage
0.1µF
CO
CI0.33µF
Output
Input LM78XX
13
2
0.1µF
CO
CI0.33µF
Output
Input LM78XX
13
2VXX
R1
RL
IQ
IO
IO = R1 +IQ
VXX
Notes:
1. To specify an output voltage, substitute voltage value for “XX. A common ground is required between the input and the
output voltage. The input voltage must remain typically 2.0V above the output voltage even during the low point on the input
ripple voltage.
2. CI is required if regulator is located an appreciable distance from power supply filter.
3. CO improves stability and transient response.
0.1µF
CO
CI0.33µF
Output
Input LM78XX
13
2VXX R1
R2
IQ
IRI 5 IQ
VO = VXX(1 + R2 / R1) + IQR2
24 www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Figure 13. Adjustable Output Regulator (7V to 30V)
Figure 14. High Current Voltage Regulator
Figure 15. High Output Current with Short Circuit Protection
LM741
-
+
2
3
6
4
2
3
1
0.33µF
CI
Input Output
0.1µF
CO
LM7805
10k
IRI 5 IQ
VO = VXX(1 + R2 / R1) + IQR2
3
2
1LM78XX
Output
Input
R1
3
0.33µF
IREG
0.1µF
IO
IQ1
IO = IREG + BQ1 (IREG–VBEQ1/R1)
Q1 BD536
R1 = VBEQ1
IREG–IQ1 BQ1
LM78XX
Output
0.1µF
0.33µF
R1
3
3
2
1
Q1
Input
Q2
Q1 = TIP42
Q2 = TIP42
RSC = I
SC
VBEQ2
RSC
25 www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Figure 16. Tracking Voltage Regulator
Figure 17. Split Power Supply (±15V – 1A)
LM78XX
LM741
0.1µF
0.33µF
1
2
3
72
6
434.7k
4.7k
TIP42
COMMON
COMMON
VO
-VO
VI
-VIN
_
+
3
1
2
1
3
2
0.33µF 0.1µF
2.2µF
1µF +
+
1N4001
1N4001
+15V
-15V
+20V
-20V
LM7815
MC7915
26 www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Figure 18. Negative Output Voltage Circuit
Figure 19. Switching Regulator
LM78XX
Output
Input
+
1
2
0.1µF
3
LM78XX
1mH
3
1
2
2000µF
Output
Input D45H11
0.33µF
470
4.7
10µF
0.5
Z1
+
+
27 www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Mechanical Dimensions
Dimensions in millimeters
4.50 ±0.20
9.90 ±0.20
1.52 ±0.10
0.80 ±0.10 2.40 ±0.20
10.00 ±0.20
1.27 ±0.10
ø3.60 ±0.10
(8.70)
2.80 ±0.1015.90 ±0.20
10.08 ±0.30 18.95MAX.
(1.70)
(3.70)(3.00)
(1.46)
(1.00)
(45°)
9.20 ±0.2013.08 ±0.20
1.30 ±0.10
1.30 +0.10
–0.05
0.50 +0.10
–0.05
2.54TYP
[2.54 ±0.20]
2.54TYP
[2.54 ±0.20]
TO-220
28 www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0.1
LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator
Rev. I19
TRADEMARKS
The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not
intended to be an exhaustive list of all such trademarks.
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN;
NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THESE
SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILDíS WORLDWIDE TERMS AND CONDITIONS,
SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS.
LIFE SUPPORT POLICY
FAIRCHILDíS PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR
CORPORATION.
As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, or (c) whose failure to perform
when properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to
result in significant injury to the user.
2. A critical component is any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
PRODUCT STATUS DEFINITIONS
Definition of Terms
ACEx™
ActiveArray
Bottomless
Build it Now™
CoolFET™
CROSSVOLT
DOME™
EcoSPARK™
E2CMOS™
EnSigna™
FACT™
FAST®
FASTr™
FPS™
FRFET™
GlobalOptoisolator™
GTO™
HiSeC™
I2C™
i-Lo
ImpliedDisconnect™
IntelliMAX™
ISOPLANAR™
LittleFET™
MICROCOUPLER™
MicroFET™
MicroPak™
MICROWIRE
MSX™
MSXPro™
OCX™
OCXPro™
OPTOLOGIC®
OPTOPLANAR™
PACMAN™
POP™
Power247™
PowerEdge™
PowerSaver™
PowerTrench®
QFET®
QS™
QT Optoelectronics™
Quiet Series™
RapidConfigure™
RapidConnect™
µSerDes™
ScalarPump™
SILENT SWITCHER®
SMART START™
SPM™
Stealth™
SuperFET™
SuperSOT™-3
SuperSOT™-6
SuperSOT™-8
SyncFET™
TCM
TinyLogic®
TINYOPTO™
TruTranslation™
UHC™
UniFET™
UltraFET®
VCX™
Wire
FACT Quiet Series
Across the board. Around the world.™
The Power Franchise®
Programmable Active Droop™
Datasheet Identification Product Status Definition
Advance Information Formative or In
Design
This datasheet contains the design specifications for
product development. Specifications may change in
any manner without notice.
Preliminary First Production This datasheet contains preliminary data, and
supplementary data will be published at a later date.
Fairchild Semiconductor reserves the right to make
changes at any time without notice in order to improve
design.
No Identification Needed Full Production This datasheet contains final specifications. Fairchild
Semiconductor reserves the right to make changes at
any time without notice in order to improve design.
Obsolete Not In Production This datasheet contains specifications on a product
that has been discontinued by Fairchild semiconductor.
The datasheet is printed for reference information only.