www.fairchildsemi.com
MC78XX/LM78XX/MC78XXA
3-Terminal 1A Positive Voltage Regulator
Features
•
•
•
•
•
Output Current up to 1A
Output Voltages of 5, 6, 8, 9, 10, 12, 15, 18, 24V
Thermal Overload Protection
Short Circuit Protection
Output Transistor Safe Operating Area Protection
Description
The MC78XX/LM78XX/MC78XXA series of three
terminal positive regulators are available in the
TO-220/D-PAK 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,
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 components to
obtain adjustable voltages and currents.
TO-220
1
D-PAK
1
1. Input 2. GND 3. Output
Internal Block Digram
Rev. 1.0.1
©2001 Fairchild Semiconductor Corporation
MC78XX/LM78XX/MC78XXA
Absolute Maximum Ratings
Parameter
Input Voltage (for V
O
= 5V to 18V)
(for V
O
= 24V)
Thermal Resistance Junction-Cases (TO-220)
Thermal Resistance Junction-Air (TO-220)
Operating Temperature Range
Storage Temperature Range
Symbol
V
I
V
I
R
θJC
R
θJA
T
OPR
T
STG
Value
35
40
5
65
0 ~ +125
-65 ~ +150
o
Unit
V
V
C/W
o
o
o
C/W
C
C
Electrical Characteristics (MC7805/LM7805)
(Refer to test circuit ,0°C < T
J
< 125°C, I
O
= 500mA, V
I
= 10V, C
I
= 0.33µF, C
O
= 0.1µF, unless otherwise specified)
Parameter
Symbol
T
J
=+25
o
C
Output Voltage
V
O
5.0mA
≤
Io
≤
1.0A, P
O
≤
15W
V
I
= 7V to 20V
T
J
=+25
o
C
V
O
= 7V to 25V
V
I
= 8V to 12V
I
O
= 5.0mA to1.5A
Load Regulation (Note1)
Quiescent Current
Quiescent Current Change
Output Voltage Drift
Output Noise Voltage
Ripple Rejection
Dropout Voltage
Output Resistance
Short Circuit Current
Peak Current
Regload
I
Q
∆I
Q
∆V
O
/∆T
V
N
RR
V
Drop
r
O
I
SC
I
PK
T
J
=+25
o
C
I
O
=250mA to
750mA
Conditions
MC7805/LM7805
Min.
4.8
4.75
-
-
-
-
-
-
-
-
-
62
-
-
-
-
Typ.
5.0
5.0
4.0
1.6
9
4
5.0
0.03
0.3
-0.8
42
73
2
15
230
2.2
Max.
5.2
5.25
100
50
100
50
8.0
0.5
1.3
-
-
-
-
-
-
-
mV
mA
mA
mV/
o
C
µV/Vo
dB
V
mΩ
mA
A
V
mV
Unit
Line Regulation (Note1)
Regline
T
J
=+25
o
C
I
O
= 5mA to 1.0A
V
I
= 7V to 25V
I
O
= 5mA
f = 10Hz to 100KHz, T
A
=+25
o
C
f = 120Hz
V
O
= 8V to 18V
I
O
= 1A, T
J
=+25
o
C
f = 1KHz
V
I
= 35V, T
A
=+25
o
C
T
J
=+25
o
C
Note:
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
MC78XX/LM78XX/MC78XXA
Electrical Characteristics (MC7806)
(Refer to test circuit ,0°C < T
J
< 125°C, I
O
= 500mA, V
I
=11V, C
I
= 0.33µF, C
O
= 0.1µF, unless otherwise specified)
Parameter
Symbol
T
J
=+25
o
C
Output Voltage
V
O
5.0mA
≤
I
O
≤
1.0A, P
O
≤
15W
V
I
= 8.0V to 21V
T
J
=+25
o
C
T
J
=+25
o
C
T
J
=+25
o
C
I
O
= 5mA to 1A
V
I
= 8V to 25V
I
O
= 5mA
f = 10Hz to 100KHz, T
A
=+25
o
C
f = 120Hz
V
I
= 9V to 19V
I
O
= 1A, T
J
=+25
o
C
f = 1KHz
V
I
= 35V, T
A
=+25
o
C
T
J
=+25
o
C
V
I
= 8V to 25V
V
I
= 9V to 13V
I
O
=5mA to 1.5A
I
O
=250mA to750A
Conditions
MC7806
Min.
5.75
5.7
-
-
-
-
-
-
-
-
-
59
-
-
-
-
Typ.
6.0
6.0
5
1.5
9
3
5.0
-
-
-0.8
45
75
2
19
250
2.2
Max.
6.25
6.3
120
60
120
60
8.0
0.5
1.3
-
-
-
-
-
-
-
V
mV
mV
mA
mA
mV/
o
C
µV/Vo
dB
V
mΩ
mA
A
Unit
Line Regulation (Note1)
Load Regulation (Note1)
Quiescent Current
Quiescent Current Change
Output Voltage Drift
Output Noise Voltage
Ripple Rejection
Dropout Voltage
Output Resistance
Short Circuit Current
Peak Current
Regline
Regload
I
Q
∆I
Q
∆V
O
/∆T
V
N
RR
V
Drop
r
O
I
SC
I
PK
Note:
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.
3
MC78XX/LM78XX/MC78XXA
Electrical Characteristics (MC7808)
(Refer to test circuit ,0°C < T
J
< 125°C, I
O
= 500mA, V
I
=14V, C
I
= 0.33µF, C
O
= 0.1µF, unless otherwise specified)
Parameter
Symbol
T
J
=+25
o
C
Output Voltage
V
O
5.0mA
≤
I
O
≤
1.0A, P
O
≤
15W
V
I
= 10.5V to 23V
T
J
=+25
o
C
T
J
=+25
o
C
T
J
=+25
o
C
I
O
= 5mA to 1.0A
V
I
= 10.5A to 25V
I
O
= 5mA
f = 10Hz to 100KHz, T
A
=+25
o
C
f = 120Hz, V
I
= 11.5V to 21.5V
I
O
= 1A, T
J
=+25 C
f = 1KHz
V
I
= 35V, T
A
=+25
o
C
T
J
=+25
o
C
o
Conditions
MC7808
Min.
7.7
7.6
-
-
-
-
-
-
-
-
-
56
-
-
-
-
Typ. Max.
8.0
8.0
5.0
2.0
10
5.0
5.0
0.05
0.5
-0.8
52
73
2
17
230
2.2
8.3
8.4
160
80
160
80
8.0
0.5
1.0
-
-
-
-
-
-
-
Unit
V
mV
mV
mA
mA
mV/
o
C
µV/Vo
dB
V
mΩ
mA
A
Line Regulation (Note1)
Load Regulation (Note1)
Quiescent Current
Quiescent Current Change
Output Voltage Drift
Output Noise Voltage
Ripple Rejection
Dropout Voltage
Output Resistance
Short Circuit Current
Peak Current
Regline
Regload
I
Q
∆I
Q
∆V
O
/∆T
V
N
RR
V
Drop
r
O
I
SC
I
PK
V
I
= 10.5V to 25V
V
I
= 11.5V to 17V
I
O
= 5.0mA to 1.5A
I
O
= 250mA to 750mA
Note:
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.
4
MC78XX/LM78XX/MC78XXA
Electrical Characteristics (MC7809)
(Refer to test circuit ,0°C < T
J
< 125°C, I
O
= 500mA, V
I
=15V, C
I
= 0.33µF, C
O
= 0.1µF, unless otherwise specified)
Parameter
Symbol
T
J
=+25°C
Output Voltage
V
O
5.0mA≤ I
O
≤1.0A,
P
O
≤15W
V
I
= 11.5V to 24V
T
J
=+25°C
T
J
=+25°C
T
J
=+25°C
I
O
= 5mA to 1.0A
V
I
= 11.5V to 26V
I
O
= 5mA
f = 10Hz to 100KHz, T
A
=+25
°C
f = 120Hz
V
I
= 13V to 23V
I
O
= 1A, T
J
=+25°C
f = 1KHz
V
I
= 35V, T
A
=+25°C
T
J
= +25°C
V
I
= 11.5V to 25V
V
I
= 12V to 17V
I
O
= 5mA to 1.5A
I
O
= 250mA to 750mA
Conditions
MC7809
Min.
8.65
8.6
-
-
-
-
-
-
-
-
-
56
-
-
-
-
Typ.
9
9
6
2
12
4
5.0
-
-
-1
58
71
2
17
250
2.2
Max.
9.35
9.4
180
90
180
90
8.0
0.5
1.3
-
-
-
-
-
-
-
V
mV
mV
mA
mA
mV/
°C
µV/Vo
dB
V
mΩ
mA
A
Unit
Line Regulation (Note1)
Load Regulation (Note1)
Quiescent Current
Quiescent Current Change
Output Voltage Drift
Output Noise Voltage
Ripple Rejection
Dropout Voltage
Output Resistance
Short Circuit Current
Peak Current
Regline
Regload
I
Q
∆I
Q
∆V
O
/∆T
V
N
RR
V
Drop
r
O
I
SC
I
PK
Note:
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.
5
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