www.fairchildsemi.com
MC78XXE
3-Terminal 1A Positive Voltage Regulator
Features
•
•
•
•
•
Output Current up to 1A
Output Voltages of 5, 12V
Thermal Overload Protection
Short Circuit Protection
Output Transistor Safe Operating Area Protection
Description
The MC78XXE series of three terminal positive regulators
are available in the 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, mak-
ing 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.
D-PAK
GND
1
1. Input 2. GND 3. Output
Internal Block Digram
INPUT
1
CURRENT
GENERATOR
SERIES
PASS
ELEMENT
OUTPUT
3
SOA
PROTECTION
STARTING
CIRCUIT
REFERENCE
VOLTAGE
ERROR
AMPLIFIER
THERMAL
PROTECTION
GND
2
Rev. 1.0.2
©2012 Fairchild Semiconductor Corporation
MC78XXE
Absolute Maximum Ratings
Parameter
Input Voltage (for V
O
= 5V to 18V)
Operating Temperature Range
Storage Temperature Range
Symbol
V
I
T
OPR
T
STG
Value
35
0 ~ +125
-65 ~ +150
Unit
V
C
C
Electrical Characteristics (MC7805E)
(Refer to test circuit ,0C < T
J
< 125C, I
O
= 500mA, V
I
= 10V, C
I
= 0.33F, C
O
= 0.1F, unless otherwise specified)
Parameter
Symbol
T
J
= +25C
Output Voltage
V
O
5.0mA
≤
Io
≤
1.0A, P
O
≤
15W
V
I
= 7V to 20V
T
J
= +25C
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 (Note2)
Output Noise Voltage
Ripple Rejection (Note2)
Dropout Voltage
Output Resistance (Note2)
Short Circuit Current
Peak Current (Note2)
Regload
I
Q
I
Q
V
O
/T
V
N
RR
V
Drop
r
O
I
SC
I
PK
T
J
= +25C
T
J
= +25C
I
O
= 5mA to 1.0A
V
I
= 7V to 25V
I
O
= 5mA
f = 10Hz to 100kHz, T
A
= +25C
f = 120Hz
V
O
= 8V to 18V
I
O
= 1A, T
J
=+25C
f = 1kHz
V
I
= 35V, T
A
=+25C
T
J
= +25C
I
O
=250mA to
750mA
Conditions
MC7805E/LM7805E
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/C
V/Vo
dB
V
m
mA
A
V
mV
Unit
Line Regulation (Note1)
Regline
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. These parameters, although guaranteed, are not 100% tested in production.
2
MC78XXE
Electrical Characteristics (MC7812E)
(Refer to test circuit ,0C < T
J
< 125C, I
O
= 500mA, V
I
=19V, C
I
= 0.33F, C
O
=0.1F, unless otherwise specified)
Parameter
Symbol
T
J
= +25C
Output Voltage
V
O
5.0mA
I
O
1.0A, P
O
15W
V
I
= 14.5V to 27V
T
J
= +25C
T
J
= +25C
T
J
= +25C
I
O
= 5mA to 1.0A
V
I
= 14.5V to 30V
I
O
= 5mA
f = 10Hz to 100kHz, T
A
= +25C
f = 120Hz
V
I
= 15V to 25V
I
O
= 1A, T
J
= +25C
f = 1kHz
V
I
= 35V, T
A
= +25C
T
J
= +25C
V
I
= 14.5V to 30V
V
I
= 16V to 22V
I
O
= 5mA to 1.5A
I
O
= 250mA to 750mA
Conditions
MC7812E
Min.
11.5
11.4
-
-
-
-
-
-
-
-
-
55
-
-
-
-
Typ. Max.
12
12
10
3.0
11
5.0
5.1
0.1
0.5
-1
76
71
2
18
230
2.2
12.5
12.6
240
120
240
120
8.0
0.5
1.0
-
-
-
-
-
-
-
V
Unit
Line Regulation (Note1)
Load Regulation (Note1)
Quiescent Current
Quiescent Current Change
Output Voltage Drift (Note2)
Output Noise Voltage
Ripple Rejection (Note2)
Dropout Voltage
Output Resistance (Note2)
Short Circuit Current
Peak Current (Note2)
Regline
Regload
I
Q
I
Q
V
O
/T
V
N
RR
V
Drop
r
O
I
SC
I
PK
mV
mV
mA
mA
mV/C
V/Vo
dB
V
m
mA
A
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. These parameters, although guaranteed, are not 100% tested in production.
3
MC78XXE
Typical Perfomance Characteristics
I
Figure 1. Quiescent Current
Figure 2. Peak Output Current
Figure 3. Output Voltage
Figure 4. Quiescent Current
4
MC78XXE
Typical Applications
1
Input
C
I
0.33uF
3
MC78XXE
2
C
O
0.1uF
Output
Figure 5. DC Parameters
1
MC78XXE
Input
2
3
Output
R
L
270pF
VO
0.33uF
2N6121
OR EQ.
V
O
100
OV
30uS
Figure 6. Load Regulation
5.1
Input
1
3
MC78XXE
2
R
L
Output
0.33uF
470uF
120Hz
+
Figure 7. Ripple Rejection
1
Input
C
I
0.33uF
3
MC78XXE
2
C
O
0.1uF
Output
Figure 8. Fixed Output Regulator
5