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LM78XX / LM78XXA — 3-Terminal 1 A Positive Voltage Regulator
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM78XX / LM78XXA Rev . 1.3.1
September 2014
LM78XX / LM78XXA
3-Terminal 1 A Positive Voltage Regulator
Features
Output Current up to 1 A
Output Voltages: 5, 6, 8, 9, 10, 12, 15, 18, 24 V
Thermal Overload Protection
Short-Circuit Protection
Output Transistor Safe Operating Area Protection
Ordering Information(1)
Note:
1. Above output voltage tolerance is available at 25°C.
Product Number Output Voltage
Tolerance Package Operating
Temperature Packing Method
LM7805CT
±4%
TO-220
(Single G auge)
-40°C to +125°C
Rail
LM7806CT
LM7808CT
LM7809CT
LM7810CT
LM7812CT
LM7815CT
LM7818CT
LM7824CT
LM7805ACT
±2% 0°C to +125°C
LM7809ACT
LM7810ACT
LM7812ACT
LM7815ACT
Description
The LM78XX series of three-terminal positive regulators
is 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 protection. If
adequate heat sinking is provided, they can deliver over
1 A output current. Although designed primarily as fixed-
voltage regulators, these devices can be used with exter-
nal components for adjustable voltages and currents.
1
1. Input
2. GND
3. Output
GND
TO-220 (Single Gauge)
LM78XX / LM78XXA — 3-Terminal 1 A Positive Voltage Regulator
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM78XX / LM78XXA Rev . 1.3.1 2
Block Diagram
Figure 1. Block Diagram
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the re co mmen ded operating conditions and s tres si ng the parts to these level s i s not recommended. In addi-
tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only. Values are at TA = 25°C unless ot herwise noted.
Symbol Parameter Value Unit
VIInput Voltage VO = 5 V to 18 V 35 V
VO = 24 V 40
RθJC Thermal Resistance, Junction-Case (TO-220) 5 °C/W
RθJA Thermal Resistance, Junction-Air (TO-220) 65 °C/W
TOPR Operati ng Tempe ratu re Rang e LM78xx -40 to +125 °C
LM78xxA 0 to +125
TSTG 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
LM78XX / LM78XXA — 3-Terminal 1 A Positive Voltage Regulator
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM78XX / LM78XXA Rev . 1.3.1 3
Electrical Characteristics (LM7805)
Refer to the test circuit, -40°C < TJ < 125°C, IO = 500 mA, VI = 10 V, CI = 0.1 μF, unless otherwise specifi ed.
Notes:
2. 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.
3. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Unit
VOOutput Voltage TJ = +25°C 4.805.005.20 V
IO = 5 mA to 1 A, PO 15 W,
VI = 7 V to 20 V 4.75 5.00 5.25
Regline Line Regulation(2) TJ = +25°CVI = 7 V to 25 V 4.0 100.0 mV
VI = 8 V to 12 V 1.6 50.0
Regload Load Regulation(2) TJ = +25°CIO = 5 mA to 1.5 A 9.0 100.0 mV
IO = 250 mA to 750 mA 4.0 50.0
IQQuiescent Current TJ = +25°C58mA
ΔIQQuiescent Current
Change IO = 5 mA to 1 A 0.03 0.50 mA
VI = 7 V to 25 V 0.30 1.30
ΔVO/ΔT Output Voltage Drift(3) IO = 5 mA -0.8 mV/°C
VNOutput Noise Voltage f = 10 Hz to 100 kHz, TA = +25°C42μV
RR Ripple Rejection(3) f = 120 Hz, VI = 8 V to 18 V 62 73 dB
VDROP Dropout Voltage TJ = +25°C, IO = 1 A 2 V
ROOutput Resistance(3) f = 1 kHz 15 mΩ
ISC Short-Circ uit Current TJ = +25°C, VI = 35 V 230 mA
IPK Peak Current(3) TJ = +25°C2.2A
LM78XX / LM78XXA — 3-Terminal 1 A Positive Voltage Regulator
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM78XX / LM78XXA Rev . 1.3.1 4
Electrical Characteristics (LM7806)
Refer to the test circuit, -40°C < T J < 125°C, IO = 500 mA, V I = 11 V, CI = 0.3 3 μF, CO = 0.1 μF, unless otherwise spec-
ified.
Notes:
4. 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.
5. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Unit
VOOutput Voltage TJ = +25°C 5.756.006.25 V
IO = 5 mA to 1 A, PO 15 W,
VI = 8.0 V to 21 V 5.70 6.00 6.30
Regline Line Regulation(4) TJ = +25°CVI = 8 V to 25 V 5.0 120.0 mV
VI = 9 V to 13 V 1.5 60.0
Regload Load Regulation(4) TJ = +25°C IO = 5 mA to 1.5 A 9.0 120.0 mV
IO = 250 mA to 750 mA 3.0 60.0
IQQuiescent Current TJ = +25°C58mA
ΔIQQuiescent Current
Change IO = 5 mA to 1 A 0.5 mA
VI = 8 V to 25 V 1.3
ΔVO/ΔT Output Voltage Drift(5) IO = 5 mA -0.8 mV/°C
VNOutput Noise Voltage f = 10 Hz to 100 kHz, TA = +25°C45μV
RR Ripple Rejection(5) f = 120 Hz, VI = 8 V to 18 V 62 73 dB
VDROP Dropout Voltage TJ = +25°C, IO = 1 A 2 V
ROOutput Resistance(5) f = 1 kHz 19 mΩ
ISC Short-Circ uit Current TJ = +25°C, VI = 35 V 250 mA
IPK Peak Current(5) TJ = +25°C2.2A
LM78XX / LM78XXA — 3-Terminal 1 A Positive Voltage Regulator
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM78XX / LM78XXA Rev . 1.3.1 5
Electrical Characteristics (LM7808)
Refer to the test circuit, -40°C < T J < 125°C, IO = 500 mA, V I = 14 V, CI = 0.3 3 μF, CO = 0.1 μF, unless otherwise spec-
ified.
Notes:
6. 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.
7. 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
IO = 5 mA to 1 A, PO 15 W,
VI = 10.5 V to 23 V 7.6 8.0 8.4
Regline Line Regulation(6) TJ = +25°CVI = 10.5 V to 25 V 5 160 mV
VI = 11.5 V to 17 V 2 80
Regload Load Regulation(6) TJ = +25°C IO = 5 mA to 1.5 A 10 160 mV
IO = 250 mA to 750 mA 5 80
IQQuiescent Current TJ = +25°C58mA
ΔIQQuiescent Current
Change IO = 5 mA to 1 A 0.05 0.50 mA
VI = 10.5 V to 25 V 0.5 1 .0
ΔVO/ΔT Output Voltage Drift(7) IO = 5 mA -0.8 mV/°C
VNOutput Noise Voltage f = 10 Hz to 100 kHz, TA = +25°C52μV
RR Ripple Rejection(7) f = 120 Hz, VI = 11.5 V to 21.5 V 56 73 dB
VDROP Dropout Voltage IO = 1 A, TJ = +25°C2V
ROOutput Resistance(7) f = 1 kHz 17 mΩ
ISC Short-Circ uit Current VI = 35 V, TJ = +25°C230mA
IPK Peak Current(7) TJ = +25°C2.2A
LM78XX / LM78XXA — 3-Terminal 1 A Positive Voltage Regulator
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM78XX / LM78XXA Rev . 1.3.1 6
Electrical Characteristics (LM7809)
Refer to the test circuit, -40°C < T J < 125°C, IO = 500 mA, V I = 15 V, CI = 0.3 3 μF, CO = 0.1 μF, unless otherwise spec-
ified.
Notes:
8. 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.
9. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Unit
VOOutput Voltage TJ = +25°C 8.659.009.35 V
IO = 5 mA to 1 A, PO 15 W,
VI = 11.5 V to 24 V 8.60 9.00 9.40
Regline Line Regulation(8) TJ = +25°CVI = 11.5 V to 25 V 6 180 mV
VI = 12 V to 17 V 2 90
Regload Load Regulation(8) TJ = +25°C IO = 5 mA to 1.5 A 12 180 mV
IO = 250 mA to 750 mA 4 90
IQQuiescent Current TJ = +25°C58mA
ΔIQQuiescent Current
Change IO = 5 mA to 1 A 0.5 mA
VI = 11.5 V to 26 V 1.3
ΔVO/ΔT Output Voltage Drift(9) IO = 5 mA -1 mV/°C
VNOutput Noise Voltage f = 10 Hz to 100 kHz, TA = +25°C58μV
RR Ripple Rejection(9) f = 120 Hz, VI = 13 V to 23 V 56 71 dB
VDROP Dropout Voltage IO = 1 A, TJ = +25°C2V
ROOutput Resistance(9) f = 1 kHz 17 mΩ
ISC Short-Circ uit Current VI = 35 V, TJ = +25°C250mA
IPK Peak Current(9) TJ = +25°C2.2A
LM78XX / LM78XXA — 3-Terminal 1 A Positive Voltage Regulator
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM78XX / LM78XXA Rev . 1.3.1 7
Electrical Characteristics (LM7810)
Refer to the test circuit, -40°C < T J < 125°C, IO = 500 mA, V I = 16 V, CI = 0.3 3 μF, CO = 0.1 μF, unless otherwise spec-
ified.
Notes:
10. Load and line re gulati on are s pecifi ed at co nstan t junction temperature . Cha nges in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
11. 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
IO = 5 mA to 1 A, PO 15 W,
VI = 12.5 V to 25 V 9.5 10.0 10.5
Regline Line Regulation(10) TJ = +25°CVI = 12.5 V to 25 V 10 200 mV
VI = 13 V to 25 V 3 100
Regload Load Regulation(10) TJ = +2 5°C IO = 5 mA to 1.5 A 12 200 mV
IO = 250 mA to 750 mA 4 400
IQQuiescent Current TJ = +25°C5.18.0mA
ΔIQQuiescent Current
Change IO = 5 mA to 1 A 0.5 mA
VI = 12.5 V to 29 V 1.0
ΔVO/ΔT Output Voltage Drift(11) IO = 5 mA -1 mV/°C
VNOutput Noise Voltage f = 10 Hz to 100 kHz, TA = +25°C58μV
RR Ripple Rejection(11) f = 120 Hz, VI = 13 V to 23 V 56 71 dB
VDROP Dropout Voltage IO = 1 A, TJ = +25°C2V
ROOutput Resistance(11) f = 1 kHz 17 mΩ
ISC Short-Circ uit Current VI = 35 V, TJ = +25°C250mA
IPK Peak Current(11) TJ = +25°C2.2A
LM78XX / LM78XXA — 3-Terminal 1 A Positive Voltage Regulator
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM78XX / LM78XXA Rev . 1.3.1 8
Electrical Characteristics (LM7812)
Refer to the test circuit, -40°C < T J < 125°C, IO = 500 mA, V I = 19 V, CI = 0.3 3 μF, CO = 0.1 μF, unless otherwise spec-
ified.
Notes:
12. Load and line re gulati on are s pecifi ed at co nstan t junction temperature . Cha nges in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
13. 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
IO = 5 mA to 1 A, PO 15 W,
VI = 14.5 V to 27 V 11.4 12.0 12.6
Regline Line Regulation(12) TJ = +25°CVI = 14.5 V to 30 V 10 240 mV
VI = 16 V to 22 V 3 120
Regload Load Regulation(12) TJ = +2 5°C IO = 5 mA to 1.5 A 11 240 mV
IO = 250 mA to 750 mA 5 120
IQQuiescent Current TJ = +25°C5.18.0mA
ΔIQQuiescent Current
Change IO = 5 mA to 1 A 0.1 0. 5 mA
VI = 14.5 V to 30 V 0.5 1 .0
ΔVO/ΔT Output Voltage Drift(13) IO = 5 mA -1 mV/°C
VNOutput Noise Voltage f = 10 Hz to 100 kHz, TA = +25°C76μV
RR Ripple Rejection(13) f = 120 Hz, VI = 15 V to 25 V 55 71 dB
VDROP Dropout Voltage IO = 1 A, TJ = +25°C2V
ROOutput Resistance(13) f = 1 kHz 18 mΩ
ISC Short-Circ uit Current VI = 35 V, TJ = +25°C230mA
IPK Peak Current(13) TJ = +25°C2.2A
LM78XX / LM78XXA — 3-Terminal 1 A Positive Voltage Regulator
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM78XX / LM78XXA Rev . 1.3.1 9
Electrical Characteristics (LM7815)
Refer to the test circuit, -40°C < T J < 125°C, IO = 500 mA, V I = 23 V, CI = 0.3 3 μF, CO = 0.1 μF, unless otherwise spec-
ified.
Notes:
14. Load and line re gulati on are s pecifi ed at co nstan t junction temperature . Cha nges in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
15. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Unit
VOOutput Voltage TJ = +25°C 14.40 15.00 15.60 V
IO = 5 mA to 1 A, PO 15 W,
VI = 17.5 V to 30 V 14.25 15.00 15.75
Regline Line Regulation(14) TJ = +25°CVI = 17.5 V to 30 V 11 300 mV
VI = 20 V to 26 V 3 150
Regload Load Regulation(14) TJ = +2 5°C IO = 5 mA to 1.5 A 12 300 mV
IO = 250 mA to 750 mA 4 150
IQQuiescent Current TJ = +25°C5.28.0mA
ΔIQQuiescent Current
Change IO = 5 mA to 1 A 0.5 mA
VI = 17.5 V to 30 V 1.0
ΔVO/ΔT Output Voltage Drift(15) IO = 5 mA -1 mV/°C
VNOutput Noise Voltage f = 10 Hz to 100 kHz, TA = +25°C90μV
RR Ripple Rejection(15) f = 120 Hz, VI = 18.5 V to 28.5 V 54 70 dB
VDROP Dropout Voltage IO = 1 A, TJ = +25°C2V
ROOutput Resistance(15) f = 1 kHz 19 mΩ
ISC Short-Circ uit Current VI = 35 V, TJ = +25°C250mA
IPK Peak Current(15) TJ = +25°C2.2A
LM78XX / LM78XXA — 3-Terminal 1 A Positive Voltage Regulator
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM78XX / LM78XXA Rev . 1.3.1 10
Electrical Characteristics (LM7818)
Refer to the test circuit, -40°C < T J < 125°C, IO = 500 mA, V I = 27 V, CI = 0.3 3 μF, CO = 0.1 μF, unless otherwise spec-
ified.
Notes:
16. Load and line re gulati on are s pecifi ed at co nstan t junction temperature . Cha nges in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
17. 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
IO = 5 mA to 1 A, PO 15 W,
VI = 21 V to 33 V 17.1 18.0 18.9
Regline Line Regulation(16) TJ = +25°CVI = 21 V to 33 V 15 360 mV
VI = 24 V to 30 V 5 180
Regload Load Regulation(16) TJ = +2 5°C IO = 5 mA to 1.5 A 15 360 mV
IO = 250 mA to 750 mA 5 180
IQQuiescent Current TJ = +25°C5.28.0mA
ΔIQQuiescent Current
Change IO = 5 mA to 1 A 0.5 mA
VI = 21 V to 33 V 1.0
ΔVO/ΔT Output Voltage Drift(17) IO = 5 mA -1 mV/°C
VNOutput Noise Voltage f = 10 Hz to 100 kHz, TA = +25°C110μV
RR Ripple Rejection(17) f = 120 Hz, VI = 22 V to 32 V 53 69 dB
VDROP Dropout Voltage IO = 1 A, TJ = +25°C2V
ROOutput Resistance(17) f = 1 kHz 22 mΩ
ISC Short-Circ uit Current VI = 35 V, TJ = +25°C250mA
IPK Peak Current(17) TJ = +25°C2.2A
LM78XX / LM78XXA — 3-Terminal 1 A Positive Voltage Regulator
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM78XX / LM78XXA Rev . 1.3.1 11
Electrical Characteristics (LM7824)
Refer to the test circuit, -40°C < T J < 125°C, IO = 500 mA, V I = 33 V, CI = 0.3 3 μF, CO = 0.1 μF, unless otherwise spec-
ified.
Notes:
18. Load and line re gulati on are s pecifi ed at co nstan t junction temperature . Cha nges in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
19. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Unit
VOOutput Voltage TJ = +25°C 23.00 24.00 25.00 V
IO = 5 mA to 1 A, PO 15 W,
VI = 27 V to 38 V 22.80 24.00 25.25
Regline Line Regulation(18) TJ = +25°CVI = 27 V to 38 V 17 480 mV
VI = 30 V to 36 V 6 240
Regload Load Regulation(18) TJ = +2 5°C IO = 5 mA to 1.5 A 15 480 mV
IO = 250 mA to 750 mA 5 240
IQQuiescent Current TJ = +25°C5.28.0mA
ΔIQQuiescent Current
Change IO = 5 mA to 1 A 0.1 0. 5 mA
VI = 27 V to 38 V 0.5 1.0
ΔVO/ΔT Output Voltage Drift(19) IO = 5 mA -1.5 mV/°C
VNOutput Noise Voltage f = 10 Hz to 100 kHz, TA = +25°C120μV
RR Ripple Rejection(19) f = 120 Hz, VI = 28 V to 38 V 50 67 dB
VDROP Dropout Voltage IO = 1 A, TJ = +25°C2V
ROOutput Resistance(19) f = 1 kHz 28 mΩ
ISC Short-Circ uit Current VI = 35 V, TJ = +25°C230mA
IPK Peak Current(19) TJ = +25°C2.2A
LM78XX / LM78XXA — 3-Terminal 1 A Positive Voltage Regulator
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM78XX / LM78XXA Rev . 1.3.1 12
Electrical Characteristics (LM7805A)
Refer to the test circuit, 0°C < TJ < 125°C, IO = 1 A, VI = 10 V, CI = 0.33 μF, CO = 0.1 μF, unless otherwise specified.
Notes:
20. Load and line re gulati on are s pecifi ed at co nstan t junction temperature . Cha nges in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
21. 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 = 5 mA to 1 A, PO 15 W,
VI = 7.5 V to 20 V 4.8 5.0 5.2
Regline Line Regulation(20)
VI = 7.5 V to 25 V, IO = 500 mA 5.0 50.0
mV
VI = 8 V to 12 V 3.0 50.0
TJ = +25°CVI = 7.3 V to 20 V 5.0 50.0
VI = 8 V to 12 V 1.5 25.0
Regload Load Regulation(20) TJ = +2 5°C, IO = 5 mA to 1.5 A 9 100 mVIO = 5 mA to 1 A 9 100
IO = 250 mA to 750 mA 4 50
IQQuiescent Current TJ = +25°C56mA
ΔIQQuiescent Current
Change
IO = 5 mA to 1 A 0.5 mAVI = 8 V to 25 V, IO = 500 mA 0.8
VI = 7.5 V to 20 V, TJ = +25°C0.8
ΔVO/ΔT Output Voltage Drift(21) IO = 5 mA -0.8 mV/°C
VNOutput Noise Voltage f = 10 Hz to 100 kHz, TA = +25°C42μV
RR Ripple Rejection(21) f = 120 Hz, VO = 500 mA,
VI =8 V to 18 V 68 dB
VDROP Dropout Voltage IO = 1 A, TJ = +25°C2V
ROOutput Resistance(21) f = 1 kHz 17 mΩ
ISC Short-Circ uit Current VI = 35 V, TJ = +25°C250mA
IPK Peak Current(21) TJ = +25°C2.2A
LM78XX / LM78XXA — 3-Terminal 1 A Positive Voltage Regulator
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM78XX / LM78XXA Rev . 1.3.1 13
Electrical Characteristics (LM7809A)
Refer to the test circuit, 0°C < TJ < 125°C, IO = 1 A, VI = 15 V, CI = 0.33 μF, CO = 0.1 μF, unless otherwise specified.
Notes:
22. Load and line re gulati on are s pecifi ed at co nstan t junction temperature . Cha nges in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
23. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Unit
VOOutput Voltage TJ = +25°C 8.829.009.16 V
IO = 5 mA to 1 A, PO 15 W,
VI = 11.2 V to 24 V 8.65 9.00 9.35
Regline Line Regulation(22)
VI = 11.7 V to 25 V, IO = 50 0 mA 6 90
mV
VI = 12.5 V to 19 V 4 45
TJ = +25°CVI = 11.5 V to 24 V 6 90
VI = 12.5 V to 19 V 2 45
Regload Load Regulation(22) TJ = +2 5°C, IO = 5 mA to 1.5 A 12 100 mVIO = 5 mA to 1 A 12 100
IO = 250 mA to 750 mA 5 50
IQQuiescent Current TJ = +25°C56mA
ΔIQQuiescent Current
Change
IO = 5 mA to 1 A 0.5 mAVI = 12 V to 25 V, IO = 500 mA 0.8
VI = 11.7 V to 25 V, TJ = +25°C0.8
ΔVO/ΔT Output Voltage Drift(23) IO = 5 mA -1 mV/°C
VNOutput Noise Voltage f = 10 Hz to 100 kHz, TA = +25°C58μV
RR Ripple Rejection(23) f = 120 Hz, VO = 500 mA,
VI =12 V to 22 V 62 dB
VDROP Dropout Voltage IO = 1 A, TJ = +25°C2V
ROOutput Resistance(23) f = 1 kHz 17 mΩ
ISC Short-Circ uit Current VI = 35 V, TJ = +25°C250mA
IPK Peak Current(23) TJ = +25°C2.2A
LM78XX / LM78XXA — 3-Terminal 1 A Positive Voltage Regulator
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM78XX / LM78XXA Rev . 1.3.1 14
Electrical Characteristics (LM7810A)
Refer to the test circuit, 0°C < TJ < 125°C, IO = 1 A, VI = 16 V, CI = 0.33 μF, CO = 0.1 μF, unless otherwise specified.
Notes:
24. Load and line re gulati on are s pecifi ed at co nstan t junction temperature . Cha nges in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
25. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Unit
VOOutput Voltage TJ = +25°C 9.8 10.0 10.2 V
IO = 5 mA to 1 A, PO 15 W,
VI = 12.8 V to 25 V 9.6 10.0 10.4
Regline Line Regulation(24)
VI = 12.8 V to 26 V, IO = 50 0 mA 8 100
mV
VI = 13 V to 20 V 4 50
TJ = +25°CVI = 12.5 V to 25 V 8 100
VI = 13 V to 20 V 3 50
Regload Load Regulation(24) TJ = +2 5°C, IO = 5 mA to 1.5 A 12 100 mVIO = 5 mA to 1 A 12 100
IO = 250 mA to 750 mA 5 50
IQQuiescent Current TJ = +25°C56mA
ΔIQQuiescent Current
Change
IO = 5 mA to 1 A 0.5 mAVI = 12.8 V to 25 V, IO = 500 mA 0.8
VI = 13 V to 26 V, TJ = +25°C0.5
ΔVO/ΔT Output Voltage Drift(25) IO = 5 mA -1 mV/°C
VNOutput Noise Voltage f = 10 Hz to 100 kHz, TA = +25°C58μV
RR Ripple Rejection(25) f = 120 Hz, VO = 500 mA,
VI =14 V to 24 V 62 dB
VDROP Dropout Voltage IO = 1 A, TJ = +25°C2V
ROOutput Resistance(25) f = 1 kHz 17 mΩ
ISC Short-Circ uit Current VI = 35 V, TJ = +25°C250mA
IPK Peak Current(25) TJ = +25°C2.2A
LM78XX / LM78XXA — 3-Terminal 1 A Positive Voltage Regulator
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM78XX / LM78XXA Rev . 1.3.1 15
Electrical Characteristics (LM7812A)
Refer to the test circuit, 0°C < TJ < 125°C, IO = 1 A, VI = 19 V, CI = 0.33 μF, CO = 0.1 μF, unless otherwise specified.
Notes:
26. Load and line re gulati on are s pecifi ed at co nstan t junction temperature . Cha nges in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
27. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Unit
VOOutput Voltage TJ = +25°C 11.75 12.00 12.25 V
IO = 5 mA to 1 A, PO 15 W,
VI = 14.8 V to 27 V 11.50 12.00 12.50
Regline Line Regulation(26)
VI = 14.8 V to 30 V, IO = 50 0 mA 10 120
mV
VI = 16 V to 22 V 4 120
TJ = +25°CVI = 14.5 V to 27 V 10 120
VI = 16 V to 22 V 3 60
Regload Load Regulation(26) TJ = +2 5°C, IO = 5 mA to 1.5 A 12 100 mVIO = 5 mA to 1 A 12 100
IO = 250 mA to 750 mA 5 50
IQQuiescent Current TJ = +25°C56mA
ΔIQQuiescent Current
Change
IO = 5 mA to 1 A 0.5 mAVI = 14 V to 27 V, IO = 500 mA 0.8
VI = 15 V to 30 V, TJ = +25°C0.8
ΔVO/ΔT Output Voltage Drift(27) IO = 5 mA -1 mV/°C
VNOutput Noise Voltage f = 10 Hz to 100 kHz, TA = +25°C76μV
RR Ripple Rejection(27) f = 120 Hz, VO = 500 mA,
VI =14 V to 24 V 60 dB
VDROP Dropout Voltage IO = 1 A, TJ = +25°C2V
ROOutput Resistance(27) f = 1 kHz 18 mΩ
ISC Short-Circ uit Current VI = 35 V, TJ = +25°C250mA
IPK Peak Current(27) TJ = +25°C2.2A
LM78XX / LM78XXA — 3-Terminal 1 A Positive Voltage Regulator
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM78XX / LM78XXA Rev . 1.3.1 16
Electrical Characteristics (LM7815A)
Refer to the test circuit, 0°C < TJ < 125°C, IO = 1 A, VI = 23 V, CI = 0.33 μF, CO = 0.1 μF, unless otherwise specified.
Notes:
28. Load and line re gulati on are s pecifi ed at co nstan t junction temperature . Cha nges in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
29. These parameters, although guaranteed, are not 100% tested in production.
Symbol Parameter Conditions Min. Typ. Max. Unit
VOOutput Voltage TJ = +25°C 14.75 15.00 15.30 V
IO = 5 mA to 1 A, PO 15 W,
VI = 17.7 V to 30 V 14.40 15.00 15.60
Regline Line Regulation(28)
VI = 17.4 V to 30 V, IO = 50 0 mA 10 150
mV
VI = 20 V to 26 V 5 150
TJ = +25°CVI = 17.5 V to 30 V 11 150
VI = 20 V to 26 V 3 75
Regload Load Regulation(28) TJ = +2 5°C, IO = 5 mA to 1.5 A 12 100 mVIO = 5 mA to 1 A 12 100
IO = 250 mA to 750 mA 5 50
IQQuiescent Current TJ = +25°C5.26.0mA
ΔIQQuiescent Current
Change
IO = 5 mA to 1 A 0.5 mAVI = 17.5 V to 30 V, IO = 500 mA 0.8
VI = 17.5 V to 30 V, TJ = +25°C0.8
ΔVO/ΔT Output Voltage Drift(29) IO = 5 mA -1 mV/°C
VNOutput Noise Voltage f = 10 Hz to 100 kHz, TA = +25°C90μV
RR Ripple Rejection(29) f = 120 Hz, VO = 500 mA,
VI =18.5 V to 28.5 V 58 dB
VDROP Dropout Voltage IO = 1 A, TJ = +25°C2V
ROOutput Resistance(29) f = 1 kHz 19 mΩ
ISC Short-Circ uit Current VI = 35 V, TJ = +25°C250mA
IPK Peak Current(29) TJ = +25°C2.2A
LM78XX / LM78XXA — 3-Terminal 1 A Positive Voltage Regulator
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM78XX / LM78XXA Rev . 1.3.1 17
Typical Performance Characteristics
Figure 2. Quiescent Current Figure 3. Pea k Output Current
Figure 4. Output Voltage Figure 5. Quiescent Current
6
5.75
5.5
5.25
5
4.75
4.5
VI = 10V
VO = 5V
IO = 5mA
-25-50 0 25 50 75 100 125
QUIESCENT CURRENT (mA)
JUNCTION TEMPERATURE (°C)
0
3
2.5
2
1.5
1
.5
0
TJ = 25°C
ΔVO = 100mV
5 101520253035
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)
LM78XX / LM78XXA — 3-Terminal 1 A Positive Voltage Regulator
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM78XX / LM78XXA Rev . 1.3.1 18
Typical Applications
Figure 6. DC Parameters
Figure 7. Load Regulation
Figure 8. Ripple Rejection
0.1μF
CO
CI0.33μF
Output
Input
LM78XX
13
2
LM78XX
3
2
1
0.33μF
270pF
100Ω30μS
RL
2N6121
or EQ
Output
Input
VO
0V
VO
LM78XX
Output
Input
5.1Ω
0.33μF 2
31
RL
470μF
120Hz +
LM78XX / LM78XXA — 3-Terminal 1 A Positive Voltage Regulator
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM78XX / LM78XXA Rev . 1.3.1 19
Typical Applications (Continued)
Figure 9. Fixed-Output Regulator
Figure 10. Constant Current Regulator
Notes:
29. To specify an out put volt age, substitute volta ge value for “XX”. A common ground is requ ired between the input and
the output voltage. The input volt age mu st remain typi cally 2.0 V above t he output volt age even durin g the low point
on the input ripple voltage.
30. CI is required if regulator is located an appreciable distance from power supply filter.
31. CO improves stability and transient response.
Figure 11. 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
0.1μF
CO
CI0.33μF
Output
Input
LM78XX
13
2VXX R1
R2
IQ
IRI 5 IQ
VO = VXX(1 + R2 / R1) + IQR2