MC78xxCT Series
3-Terminal Fixed
Positive Voltage Regulators
Description
These voltage regulators are monolithic integrated
circuits designed as fixed-voltage regulators for a
wide variety of applications including local, on-card
regulation.These regulators employ inter nal current
limiting, thermal shutdown, and safe-area compen-
sation.With adequate heatsinking the MC78xxCT
can deliver output currents in excess of 1.5 ampere.
Although designed primar ily as a fixed voltage
regulator, these devices can be used with external
components to obtain adjustable voltages with
currents.
Features
• Output current in excess of 1.0 ampere
• No exter nal components required
• Internal ther mal overload protection
• Internal short-circuit current limiting
• Output transistor safe-area compensation
• Output voltage offered in 2% tolerance
Mechanical Data
Case: TO-220 Package
Case outline is on the back page.
New Product
GND
Input
1
Output
3
2
Reference
Voltage
Starting
Circuit Error
Amplifier
Current
Generator SOA
Protection
Thermal
Protection
Series
Pass
Element
Internal Block Diagram
Output
Input
Cin
0.33µF
MC78xx
Co
0.1µF
Standard Application
Notes:
A common ground is required between the input and the output voltages.
The input voltage must remain typically 2.0V above the output voltage
even during the low point on the input ripple voltage.
xx = these two digits of the part number indicate output voltage.
Cin is required if regulator is located an appreciable distance from power
supply filter.
Co is not needed for stability, however, it does improve transient response.
123
MC78xxCT
TO-220AB
10/10/01
1 of 9
Pin Definition
1. Input
2. Ground
3. Output
(Heatsink/tab
connected to pin 2)
MC78xxCT Series
3-Terminal Fixed
Positive Voltage Regulators
Electrical Characteristics MC7805
Vin = 10V, I
out
= 500mA, 0°C T
J
125°C, Cin = 0.33µF, C
out
= 0.1µF; unless otherwise noted.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage Vout
TJ= 25°C 4.90 5 5.10 V
7V Vin 20V, 4.85 5.15
5mA Iout 1.0A,PD15W
Line Regulation REGline 7V Vin < 25V 3 100 mV
(TJ= 25°C) 8V Vin < 13V 150
Load Regulation REGload 10mA Iout < 1.5A 15 100 mV
(TJ= 25°C) 250mA Iout < 750mA 550
Quiescent Current IqIout = 0, TJ= 25°C4.2 8 mA
Quiescent Current Change Iq7V Vin 25V ——1.3 mA
5mA Iout 1.0A ——0.5
Output Noise Voltage Vn 10Hzf100KHz,TJ=25°C40 µV
Ripple Rejection Ratio RR f = 120Hz 62 78 dB
Dropout Voltage Vdrop Iout = 1.0A, TJ= 25°C2V
Output Resistance Rout f = 1KHz 17 m
Output Shor t Circuit Current Ios TJ= 25°C750 mA
Peak Output Current Io peak TJ= 25°C1.5 A
Temperature Coefficient of Output Voltage Vout/TJIout=5mA,0°CTJ125°C—–1.1 mV/°C
Maximum Ratings Ratings at 25°C ambient temperature unless otherwise specified.
Parameter Symbol Value Unit
Input Voltage(1) Vin 30 V
Input Voltage(2) Vin 40 V
Thermal Resistance(3) RθJC 5°C/W
Operating Junction Temperature Range TJ20 to +150 °C
Storage Junction Temperature Range Tstg 65 to +150 °C
Notes: (1) MC7805 to MC7818
(2) MC7824
(3) Follow the derating curve (fig. 1)
2 of 9
MC78xxCT Series
3-Terminal Fixed
Positive Voltage Regulators
Electrical Characteristics MC7806
Vin = 11V, I
out
= 500mA, 0°C T
J
125°C, Cin = 0.33µF, C
out
= 0.1µF; unless otherwise noted.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage Vout
TJ= 25°C 5.88 6.0 6.12 V
8V Vin 21V, 5.83 6.17
5mA Iout 1.0A,PD15W
Line Regulation REGline 8V Vin < 25V 5 120 mV
(TJ= 25°C) 9V Vin < 13V 1.5 60
Load Regulation REGload 10mA Iout < 1.5A 14 120 mV
(TJ= 25°C) 250mA Iout < 750mA 460
Quiescent Current IqIout = 0, TJ= 25°C4.3 8.0 mA
Quiescent Current Change Iq8V Vin 25V ——1.3 mA
5mA Iout 1.0A ——0.5
Output Noise Voltage Vn 10Hzf100KHz,TA=25°C45 µV
Ripple Rejection Ratio RR f = 120Hz, 9V Vin 19V 59 75 dB
Dropout Voltage Vdrop Iout = 1.0A, TJ= 25°C2V
Output Resistance Rout f = 1KHz 19 m
Output Shor t Circuit Current Ios TJ= 25°C550 mA
Peak Output Current Io peak TJ= 25°C1.5 A
Temperature Coefficient of Output Voltage Vout/TJIout=5mA,0°CTJ125°C—–0.8 mV/°C
Electrical Characteristics MC7808
Vin = 14V, I
out
= 500mA, 0°C T
J
125°C, Cin = 0.33µF, C
out
= 0.1µF; unless otherwise noted.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage Vout
TJ= 25°C 7.84 8.0 8.16 V
10.5V Vin 23V, 7.74 8.26
5mA Iout 1.0A,PD15W
Line Regulation REGline 10.5V Vin < 25V 6 160 mV
(TJ= 25°C) 11V Vin < 15V 280
Load Regulation REGload 10mA Iout < 1.5A 12 160 mV
(TJ= 25°C) 250mA Iout < 750mA 480
Quiescent Current IqIout = 0, TJ= 25°C4.3 8.0 mA
Quiescent Current Change Iq10.5V Vin 25V —— 1mA
5mA Iout 1.0A ——0.5
Output Noise Voltage Vn 10Hzf100KHz,TJ=25°C52 µV
Ripple Rejection Ratio RR f = 120Hz 56 72 dB
Dropout Voltage Vdrop Iout = 1.0A, TJ= 25°C2V
Output Resistance Rout f = 1KHz 16 m
Output Shor t Circuit Current Ios TJ= 25°C450 mA
Peak Output Current Io peak TJ= 25°C1.5 A
Temperature Coefficient of Output Voltage Vout/TJIout=5mA,0°CTJ125°C—–0.8 mV/°C
3 of 9
MC78xxCT Series
3-Terminal Fixed
Positive Voltage Regulators
Electrical Characteristics MC7809
Vin = 15V, I
out
= 500mA, 0°C T
J
125°C, Cin = 0.33µF, C
out
= 0.1µF; unless otherwise noted.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage Vout
TJ= 25°C 8.82 9 9.18 V
11.5V Vin 24V, 8.77 9.23
5mA Iout 1.0A,PD15W
Line Regulation REGline 11.5V Vin < 27V 6 160 mV
(TJ= 25°C) 12V Vin < 16V 280
Load Regulation REGload 5mA Iout < 1.5A 12 160 mV
(TJ= 25°C) 250mA Iout < 750mA 480
Quiescent Current IqIout = 0, TJ= 25°C4.3 8 mA
Quiescent Current Change Iq11.5V Vin 27V —— 1mA
5mA Iout 1.0A ——0.5
Output Noise Voltage Vn 10Hzf100KHz,TJ=25°C52 µV
Ripple Rejection Ratio RR f = 120Hz,12V Vin 22V 55 72 dB
Dropout Voltage Vdrop Iout = 1.0A, TJ= 25°C2V
Output Resistance Rout f = 1KHz 16 m
Output Shor t Circuit Current Ios TJ= 25°C450 mA
Peak Output Current Io peak TJ= 25°C1.5 A
Temperature Coefficient of Output Voltage Vout/TJIout=5mA,0°CTJ125°C—–1mV/°C
Electrical Characteristics MC7810
Vin = 16V, I
out
= 500mA, 0°C T
J
125°C, Cin = 0.33µF, C
out
= 0.1µF; unless otherwise noted.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage Vout
TJ= 25°C 9.8 10 10.2 V
12.5V Vin 25V, 9.75 10.25
5mA Iout 1.0A,PD15W
Line Regulation REGline 12.5V Vin < 28V 10 240 mV
(TJ= 25°C) 13V Vin < 17V 3 120
Load Regulation REGload 10mA Iout < 1.5A 12 240 mV
(TJ= 25°C) 250mA Iout < 750mA 4 120
Quiescent Current IqIout = 0, TJ= 25°C4.3 8 mA
Quiescent Current Change Iq12.5V Vin 28V —— 1mA
5mA Iout 1.0A ——0.5
Output Noise Voltage Vn 10Hzf100KHz,TJ=25°C52 µV
Ripple Rejection Ratio RR f = 120Hz, 13V Vin 23V 54 72 dB
Dropout Voltage Vdrop Iout = 1.0A, TJ= 25°C2V
Output Resistance Rout f = 1KHz 16 m
Output Shor t Circuit Current Ios TJ= 25°C450 mA
Peak Output Current Io peak TJ= 25°C1.5 A
Temperature Coefficient of Output Voltage Vout/TJIout=5mA,0°CTJ125°C—–1mV/°C
4 of 9
MC78xxCT Series
3-Terminal Fixed
Positive Voltage Regulators
Electrical Characteristics MC7812
Vin = 19V, I
out
= 500mA, 0°C T
J
125°C, Cin = 0.33µF, C
out
= 0.1µF; unless otherwise noted.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage Vout
TJ= 25°C 11.76 12.0 12.24 V
14.5V Vin 27V, 11.66 12.34
5mA Iout 1.0A,PD15W
Line Regulation REGline 14V Vin < 30V 10 240 mV
(TJ= 25°C) 15V Vin < 19V 3 120
Load Regulation REGload 10mA Iout < 1.5A 12 240 mV
(TJ= 25°C) 250mA Iout < 750mA 4 120
Quiescent Current IqIout = 0, TJ= 25°C4.3 8 mA
Quiescent Current Change Iq14.5V Vin 30V —— 1mA
5mA Iout 1.0A ——0.5
Output Noise Voltage Vn 10Hzf100KHz,TJ=25°C75 µV
Ripple Rejection Ratio RR f = 120Hz,15V Vin 25V 55 71 dB
Dropout Voltage Vdrop Iout = 1.0A, TJ= 25°C2V
Output Resistance Rout f = 1KHz 18 m
Output Shor t Circuit Current Ios TJ= 25°C350 mA
Peak Output Current Io peak TJ= 25°C1.5 A
Temperature Coefficient of Output Voltage Vout/TJIout=5mA,0°CTJ125°C—–1mV/°C
Electrical Characteristics MC7815
Vin = 23V, I
out
= 500mA, 0°C T
J
125°C, Cin = 0.33µF, C
out
= 0.1µF; unless otherwise noted.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage Vout
TJ= 25°C 14.7 15.0 15.3 V
17.5V Vin 30V, 14.55 15.45
5mA Iout 1.0A,PD15W
Line Regulation REGline 17.5V Vin < 30V 11 300 mV
(TJ= 25°C) 13V Vin < 17V 3 150
Load Regulation REGload 10mA Iout < 1.5A 12 300 mV
(TJ= 25°C) 250mA Iout < 750mA 4 150
Quiescent Current IqIout = 0, TJ= 25°C4.4 8 mA
Quiescent Current Change Iq17.5V Vin 30V —— 1mA
5mA Iout 1.0A ——0.5
Output Noise Voltage Vn 10Hzf100KHz,TJ=25°C90 µV
Ripple Rejection Ratio RR f = 120Hz, 18V Vin 28V 54 70 dB
Dropout Voltage Vdrop Iout = 1.0A, TJ= 25°C2V
Output Resistance Rout f = 1KHz 19 m
Output Shor t Circuit Current Ios TJ= 25°C230 mA
Peak Output Current Io peak TJ= 25°C1.5 A
Temperature Coefficient of Output Voltage Vout/TJIout=5mA,0°CTJ125°C—–1mV/°C
5 of 9
MC78xxCT Series
3-Terminal Fixed
Positive Voltage Regulators
Electrical Characteristics MC7818
Vin = 27V, I
out
= 500mA, 0°C T
J
125°C, Cin = 0.33µF, C
out
= 0.1µF; unless otherwise noted.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage Vout
TJ= 25°C 17.64 18.0 18.36 V
21V Vin 33V, 17.44 18.56
5mA Iout 1.0A,PD15W
Line Regulation REGline 21V Vin < 33V 15 360 mV
(TJ= 25°C) 22V Vin < 26V 5 180
Load Regulation REGload 10mA Iout < 1.5A 12 360 mV
(TJ= 25°C) 250mA Iout < 750mA 4 180
Quiescent Current IqIout = 0, TJ= 25°C4.5 8 mA
Quiescent Current Change Iq21V Vin 33V —— 1mA
5mA Iout 1.0A ——0.5
Output Noise Voltage Vn 10Hzf100KHz,TJ=25°C110 mV
Ripple Rejection Ratio RR f = 120Hz,21V Vin 31V 53 69 dB
Dropout Voltage Vdrop Iout = 1.0A, TJ= 25°C2V
Output Resistance Rout f = 1KHz 22 m
Output Shor t Circuit Current Ios TJ= 25°C200 mA
Peak Output Current Io peak TJ= 25°C1.5 A
Temperature Coefficient of Output Voltage Vout/TJIout=5mA,0°CTJ125°C—–1mV/°C
Electrical Characteristics MC7824
Vin = 33V, I
out
= 500mA, 0°C T
J
125°C, Cin = 0.33µF, C
out
= 0.1µF; unless otherwise noted.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage Vout
TJ= 25°C 23.52 24.0 24.48 V
26V Vin 38V, 23.32 24.68
5mA Iout 1.0A,PD15W
Line Regulation REGline 26V Vin < 38V 18 480 mV
(TJ= 25°C) 27V Vin < 32V 6 240
Load Regulation REGload 10mA Iout < 1.5A 12 480 mV
(TJ= 25°C) 250mA Iout < 750mA 4 240
Quiescent Current IqIout = 0, TJ= 25°C4.6 8 mA
Quiescent Current Change Iq26V Vin 38V —— 1mA
5mA Iout 1.0A ——0.5
Output Noise Voltage Vn 10Hzf100KHz,TJ=25°C170 µV
Ripple Rejection Ratio Rrej f = 120Hz, 26V Vin 36V 50 66 dB
Dropout Voltage Vdrop Iout = 1.0A, TJ= 25°C2V
Output Resistance Rout f = 1KHz 28 m
Output Shor t Circuit Current Ios TJ= 25°C150 mA
Peak Output Current Io peak TJ= 25°C1.5 A
Temperature Coefficient of Output Voltage Vout/TJIout=5mA,0°CTJ125°C—–1.5 mV/°C
6 of 9
MC78xxCT Series
3-Terminal Fixed
Positive Voltage Regulators
Ratings and
Characteristic Curves(TA= 25°C unless otherwise noted)
8.0
16
20
12
0 25 50 75 100 125 150
Fig. 1 Power Dissipation vs.
Ambient Temperature (MC78xxCT)
Power Dissipation (W)
Ambient Temperatue (°C)
4.0
00.5
1.0
1.5
2.0
0 25 50 75 100 125
Fig. 2 Dropout Voltage
vs. Junction Temperature
VIN -- VOUT, Input - Output
Voltage Differential (V)
2.5
0 6.0 12 18 24 30
Fig. 3 Peak Output Current
Io -- Output Current (A)
Input -- Output Voltage Differential (V)
0.75
1.50
2.25
3.00
4.0 6.0 8.0 10 12 14 16 18 20 22 24
Fig. 4 Ripple Rejection Ratio
vs. Output Voltage
RR -- Ripple Rejection (db)
Vo -- Output Voltage (V)
40
50
60
70
80
4.0 8.0 12 16 20 24
Fig. 5 Output Impedance (m)
vs. Output Voltage
Vo -- Output Voltage (V)
10
100
1000
0
f = 120Hz
Io = 20mA
˘Vin = 1.0V (RMS)
Io = 500mA
Io = 200mA
Io = 20mA
Io = 0mA
Io = 1.0A
f = 120Hz
Io = 500mA
CL = OuF
θJC = 5°C/W
θJA = 65°C/W
TJ (max) = 150°C
θHS = 5°C/W
θHS = 15°C/W
No Heatsink
TJ = --40°C
TJ = 0°C
TJ = 25°C
TJ = 125°C
Part # / Vin
7805 / 10V
7806 / 11V
7808 / 14V
7812 / 19V
7815 / 23V
7818 / 27V
7824 / 33V
--75 --50 --25 0 25 50 100 125 150 175 200
Fig. 6 Output Voltage
vs. Junction Temperature
Vo -- Output Voltage (V)
TJ -- Junction Temperature (°C)
5.90
6.00
6.10
6.20
5.80
Vin = 10V
Vo = 6.0V
Io = 20mA
7 of 9
MC78xxCT Series
3-Terminal Fixed
Positive Voltage Regulators
Ratings and
Characteristic Curves(TA= 25°C unless otherwise noted)
0255075--75 --50 --25 100 125
IB -- Quiescent Current (mA)
TJ -- Junction Temperature (°C)
1.0
2.0
3.0
4.0
5.0
4.02.00 6.0 8.0 10 12 14 16
VO -- Output Voltage (V)
VI -- Input Voltage (V)
0
2.0
4.0
6.0
8.0
0
Io = 10mA
Io = 500mA
Vin = 10V
Vo = 5.0V
Io = 20mA
Vin = 10V
Vo = 5.0V
Io = 5.0mA Io = 1.0A
MC78xxC MC7805
TJ = 25°C
MC78xx
Fig. 7 Quiescent Current
vs. Junction Temperature Fig. 8 Output Voltage
vs. Input Voltage
8 of 9
9 of 9
MC78xxCT Series
3-Terminal Fixed
Positive Voltage Regulators
8.20
14
2.5 2.5
3
0.8
3.6
10 1.3
2.5
0.5
29
4.5
TO-220 Case Outline
Dimensions in millimeters