ON Semiconductort
3.0 A Positive Voltage
Regulators
This family of fixed voltage regulators are monolithic integrated
circuits capable of driving loads in excess of 3.0 A. These
three–terminal regulators employ internal current limiting, thermal
shutdown, and safe–area compensation. Devices are available with
improved specifications, including a 2% output voltage tolerance, on
AC–suffix 5.0, 12 and 15 V device types.
Although designed primarily as a fixed voltage regulator, these
devices can be used with external components to obtain adjustable
voltages and currents. This series of devices can be used with a
series–pass transistor to supply up to 15 A at the nominal output
voltage.
•
Output Current in Excess of 3.0 A
•
Power Dissipation: 25 W
•
No External Components Required
•
Output Voltage Offered in 2% and 4% Tolerance*
•
Thermal Regulation is Specified
•
Internal Thermal Overload Protection
•
Internal Short Circuit Current Limiting
•
Output Transistor Safe–Area Compensation
MC78T00
Series
THREE–AMPERE
POSITIVE FIXED
VOLTAGE REGULATORS
SEMICONDUCTOR
TECHNICAL DATA
T SUFFIX
PLASTIC PACKAGE
CASE 221A
Pin 1. Input
2. Ground
3. Output
1
2
3
Heatsink surface is connected to Pin 2.
DEVICE TYPE/NOMINAL OUTPUT VOLTAGE
MC78T05
MC78T08
5.0 V
8.0 V
MC78T12
MC78T15
12 V
15 V
ORDERING INFORMATION
Operating
Temperature
Package
Range
T
J
= 0° to
+125°C
T
J
= –40° to
+125°C
Plastic
Power
Plastic
Power
Device
MC78TXXCT
MC78TXXACT
V
O
Tol.
4%
2%*
4%
2%*
Simplified Application
Input
C
in
*
0.33µF
MC78TXX
Output
C
O
**
MC78TXXBT#
MC78TXXABT#
XX Indicates nominal voltage.
* 2% regulators available in 5, 12 and 15 V devices.
# Automotive temperature range selections are avail-
able with special test conditions and additional
tests. Contact your local ON Semiconductor sales
office for information.
A common ground is required between the input and the output voltages. The input voltage
must remain typically 2.2 V above the output voltage even during the low point on the input
ripple voltage.
XX these two digits of the type number indicate voltage.
**
C
in
is required if regulator is located an appreciable distance from power supply filter.
**
(See Applications Information for details.)
** C
O
is not needed for stability; however, it does improve transient response.
©
Semiconductor Components Industries, LLC, 2002
1
January, 2002 – Rev. 3
Publication Order Number:
MC78T00/D
MC78T00 Series
MAXIMUM RATINGS
(T
A
= +25°C, unless otherwise noted.)
Rating
Input Voltage (5.0 V – 12 V)
Input Voltage
(15 V)
Power Dissipation and Thermal Characteristics
Plastic Package (Note 1)
T
A
= +25°C
Thermal Resistance, Junction–to–Air
T
C
= +25°C
Thermal Resistance, Junction–to–Case
Storage Junction Temperature
Operating Junction Temperature Range
(MC78T00C, AC)
Symbol
V
I
Value
35
40
Unit
Vdc
P
D
R
θJA
P
D
R
θJC
T
stg
T
J
Internally Limited
65
Internally Limited
2.5
+150
0 to +125
°C/W
°C/W
°C
°C
NOTES:
1. Although power dissipation is internally limited, specifications apply only for P
O
≤
P
max
, P
max
= 25 W.
ELECTRICAL CHARACTERISTICS
(V
in
= 10 V, I
O
= 3.0 A, 0°C
≤
T
J
≤
125°C, P
O
≤
P
max
[Note 1], unless otherwise noted.)
MC78T05AC
Characteristics
Output Voltage
(5.0 mA
≤
I
O
≤
3.0 A, T
J
= +25°C)
(5.0 mA
≤
I
O
≤
3.0 A;
5.0 mA
≤
I
O
≤
2.0 A, 7.3 Vdc
≤
V
in
≤
20 Vdc)
Line Regulation (Note 2)
(7.2 Vdc
≤
V
in
≤
35 Vdc, I
O
= 5.0 mA, T
J
= +25°C;
7.2 Vdc
≤
V
in
≤
35 Vdc, I
O
= 1.0 A, T
J
= +25°C;
8.0 Vdc
≤
V
in
≤
12 Vdc, I
O
= 3.0 A, T
J
= +25°C;
7.5 Vdc
≤
V
in
≤
20 Vdc, I
O
= 1.0 A)
Load Regulation (Note 2)
(5.0 mA
≤
I
O
≤
3.0 A, T
J
= +25°C)
(5.0 mA
≤
I
O
≤
3.0 A)
Thermal Regulation
(Pulse = 10 ms, P = 20 W, T
A
= +25°C)
Quiescent Current
(5.0 mA
≤
I
O
≤
3.0 A, T
J
= +25°C)
(5.0 mA
≤
I
O
≤
3.0 A)
Quiescent Current Change
(7.2 Vdc
≤
V
in
≤
35 Vdc, I
O
= 5.0 mA, T
J
= +25°C;
5.0 mA
≤
I
O
≤
3.0 A, T
J
= +25°C;
7.5 Vdc
≤
V
in
≤
20 Vdc, I
O
= 1.0 A)
Ripple Rejection
(8.0 Vdc
≤
V
in
≤
18 Vdc, f = 120 Hz,
I
O
= 2.0 A, T
J
= 25°C)
Dropout Voltage (I
O
= 3.0 A, T
J
= +25°C)
Output Noise Voltage
(10 Hz
≤
f
≤
100 kHz, T
J
= +25°C)
Output Resistance (f = 1.0 kHz)
Short Circuit Current Limit
(V
in
= 35 Vdc, T
J
= +25°C)
Peak Output Current (T
J
= +25°C)
Average Temperature Coefficient of Output Voltage
(I
O
= 5.0 mA)
Symbol
V
O
4.9
4.8
Reg
line
–
5.0
5.0
3.0
5.1
5.2
25
4.8
4.75
–
5.0
5.0
3.0
5.2
5.25
25
mV
Min
Typ
Max
Min
MC78T05C
Typ
Max
Unit
Vdc
Reg
load
–
–
Reg
therm
I
B
–
–
∆I
B
–
3.5
4.0
0.3
5.0
6.0
1.0
–
–
–
3.5
4.0
0.3
5.0
6.0
1.0
–
10
15
0.001
30
80
0.01
–
–
–
10
15
0.002
30
80
0.03
mV
%V
O
/W
mA
mA
RR
62
75
–
62
75
–
dB
V
in
–V
O
V
n
R
O
I
SC
I
max
TCV
O
–
–
–
–
–
–
2.2
10
2.0
1.5
5.0
0.2
2.5
–
–
–
–
–
–
–
–
–
–
–
2.2
10
20
1.5
5.0
0.2
2.5
–
–
–
–
–
Vdc
µV/V
O
mΩ
A
A
mV/°C
NOTES:
1. Although power dissipation is internally limited, specifications apply only for P
O
≤
P
max
, P
max
= 25 W.
2. Line and load 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 cycle is used.
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2
MC78T00 Series
ELECTRICAL CHARACTERISTICS
(V
in
= 13 V, I
O
= 3.0 A, 0°C
≤
T
J
≤
125°C, P
O
≤
P
max
[Note 1], unless otherwise noted.)
MC78T08C
Characteristics
Output Voltage
(5.0 mA
≤
I
O
≤
3.0 A, T
J
= +25°C)
(5.0 mA
≤
I
O
≤
3.0 A;
5.0 mA
≤
I
O
≤
2.0 A, 10.4 Vdc
≤
V
in
≤
23 Vdc)
Line Regulation (Note 2)
(10.3 Vdc
≤
V
in
≤
35 Vdc, I
O
= 5.0 mA, T
J
= +25°C
10.3 Vdc
≤
V
in
≤
35 Vdc, I
O
= 1.0 A, T
J
= +25°C
11 Vdc
≤
V
in
≤
17 Vdc, I
O
= 3.0 A, T
J
= +25°C
10.7 Vdc
≤
V
in
≤
23 Vdc, I
O
= 1.0 A)
Load Regulation (Note 2)
(5.0 mA
≤
I
O
≤
3.0 A, T
J
= +25°C)
(5.0 mA
≤
I
O
≤
3.0 A)
Thermal Regulation
(Pulse = 10 ms, P = 20 W, T
A
= +25°C)
Quiescent Current
(5.0 mA
≤
I
O
≤
3.0 A, T
J
= +25°C)
(5.0 mA
≤
I
O
≤
3.0 A)
Quiescent Current Change
(10.3 Vdc
≤
V
in
≤
35 Vdc, I
O
= 5.0 mA, T
J
= +25°C;
5.0 mA
≤
I
O
≤
3.0 A, T
J
= +25°C;
10.7 Vdc
≤
V
in
≤
23 Vdc, I
O
= 1.0 A)
Ripple Rejection
(11 Vdc
≤
V
in
≤
21 Vdc, f = 120 Hz, I
O
= 2.0 A, T
J
= 25°C)
Dropout Voltage (I
O
= 3.0 A, T
J
= +25°C)
Output Noise Voltage
(10 Hz
≤
f
≤
100 kHz, T
J
= +25°C)
Output Resistance (f = 1.0 kHz)
Short Circuit Current Limit
(V
in
= 35 Vdc, T
J
= +25°C)
Peak Output Current (T
J
= +25°C)
Average Temperature Coefficient of Output Voltage (I
O
= 5.0 mA)
Symbol
V
O
7.7
7.6
Reg
line
–
8.0
8.0
4.0
8.3
8.4
35
mV
Min
Typ
Max
Unit
Vdc
Reg
load
–
–
Reg
therm
I
B
–
–
∆I
B
–
3.5
4.0
0.3
5.0
6.0
1.0
–
10
15
0.002
30
80
0.03
mV
%V
O
/W
mA
mA
RR
V
in
–V
O
V
n
R
O
I
SC
I
max
TCV
O
60
–
–
–
–
–
–
71
2.2
10
2.0
1.5
5.0
0.3
–
2.5
–
–
–
–
–
dB
Vdc
µV/V
O
mΩ
A
A
mV/°C
NOTES:
1. Although power dissipation is internally limited, specifications apply only for P
O
≤
P
max
, P
max
= 25 W.
2. Line and load 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 cycle is used.
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3
MC78T00 Series
ELECTRICAL CHARACTERISTICS
(V
in
= 17 V, I
O
= 3.0 A, 0°C
≤
T
J
≤
125°C, P
O
≤
P
max
[Note 1], unless otherwise noted.)
MC78T12AC
Characteristics
Output Voltage
(5.0 mA
≤
I
O
≤
3.0 A, T
J
= +25°C)
(5.0 mA
≤
I
O
≤
3.0 A,
5.0 mA
≤
I
O
≤
2.0 A, 14.5 Vdc
≤
V
in
≤
27 Vdc)
Line Regulation (Note 2)
(14.5 Vdc
≤
V
in
≤
35 Vdc, I
O
= 5.0 mA, T
J
= +25°C;
14.5 Vdc
≤
V
in
≤
35 Vdc, I
O
= 1.0 A, T
J
= +25°C;
16 Vdc
≤
V
in
≤
22 Vdc, I
O
= 3.0 A, T
J
= +25°C;
14.9 Vdc
≤
V
in
≤
27 Vdc, I
O
= 1.0 A)
Load Regulation (Note 2)
(5.0 mA
≤
I
O
≤
3.0 A, T
J
= +25°C)
(5.0 mA
≤
I
O
≤
3.0 A)
Thermal Regulation
(Pulse = 10 ms, P = 20 W, T
A
= +25°C)
Quiescent Current
(5.0 mA
≤
I
O
≤
3.0 A, T
J
= +25°C)
(5.0 mA
≤
I
O
≤
3.0 A)
Quiescent Current Change
(14.5 Vdc
≤
V
in
≤
35 Vdc, I
O
= 5.0 mA, T
J
= +25°C;
5.0 mA
≤
I
O
≤
3.0 A, T
J
= +25°C;
14.9 Vdc
≤
V
in
≤
27 Vdc, I
O
= 1.0 A)
Ripple Rejection
(15 Vdc
≤
V
in
≤
25 Vdc, f = 120 Hz,
I
O
= 2.0 A, T
J
= 25°C)
Dropout Voltage (I
O
= 3.0 A, T
J
= +25°C)
Output Noise Voltage
(10 Hz
≤
f
≤
100 kHz, T
J
= +25°C)
Output Resistance (f = 1.0 kHz)
Short Circuit Current Limit
(V
in
= 35 Vdc, T
J
= +25°C)
Peak Output Current (T
J
= +25°C)
Average Temperature Coefficient
of Output Voltage (I
O
= 5.0 mA)
Symbol
V
O
11.75
11.5
Reg
line
–
12
12
6.0
12.25
12.5
45
11.5
11.4
–
12
12
6.0
12.5
12.6
45
mV
Min
Typ
Max
Min
MC78T12C
Typ
Max
Unit
Vdc
Reg
load
–
–
Reg
therm
I
B
–
–
∆I
B
–
3.5
4.0
0.3
5.0
6.0
1.0
–
–
–
3.5
4.0
0.3
5.0
6.0
1.0
–
10
15
0.001
30
80
0.01
–
–
–
10
15
0.002
30
80
0.03
mV
%V
O
/W
mA
mA
RR
57
67
–
57
67
–
dB
V
in
– V
O
V
n
R
O
I
SC
I
max
TCV
O
–
–
–
–
–
–
2.2
10
2.0
1.5
5.0
0.5
2.5
–
–
–
–
–
–
–
–
–
–
–
2.2
10
20
1.5
5.0
0.5
2.5
–
–
–
–
–
Vdc
µV/V
O
mΩ
A
A
mV/°C
NOTES:
1. Although power dissipation is internally limited, specifications apply only for P
O
≤
P
max
, P
max
= 25 W.
2. Line and load 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 cycle is used.
http://onsemi.com
4
MC78T00 Series
ELECTRICAL CHARACTERISTICS
(V
in
= 20 V, I
O
= 3.0 A, 0°C
≤
T
J
≤
125°C, P
O
≤
P
max
[Note 1], unless otherwise noted.)
MC78T15AC
Characteristics
Output Voltage
(5.0 mA
≤
I
O
≤
3.0 A, T
J
= +25°C)
(5.0 mA
≤
I
O
≤
3.0 A;
5.0 mA
≤
I
O
≤
2.0 A, 17.5 Vdc
≤
V
in
≤
30 Vdc)
Line Regulation (Note 2)
(17.6 Vdc
≤
V
in
≤
40 Vdc, I
O
= 5.0 mA, T
J
= +25°C;
17.6 Vdc
≤
V
in
≤
40 Vdc, I
O
= 1.0 A, T
J
= +25°C;
20 Vdc
≤
V
in
≤
26 Vdc, I
O
= 3.0 A, T
J
= +25°C;
18 Vdc
≤
V
in
≤
30 Vdc, I
O
= 1.0 A)
Load Regulation (Note 2)
(5.0 mA
≤
I
O
≤
3.0 A, T
J
= +25°C)
(5.0 mA
≤
I
O
≤
3.0 A)
Thermal Regulation
(Pulse = 10 ms, P = 20 W, T
A
= +25°C)
Quiescent Current
(5.0 mA
≤
I
O
≤
3.0 A, T
J
= +25°C)
(5.0 mA
≤
I
O
≤
3.0 A)
Quiescent Current Change
(17.6 Vdc
≤
V
in
≤
40 Vdc, I
O
= 5.0 mA, T
J
= +25°C;
5.0 mA
≤
I
O
≤
3.0 A, T
J
= +25°C;
18 Vdc
≤
V
in
≤
30 Vdc, I
O
= 1.0 A)
Ripple Rejection
(18.5 Vdc
≤
V
in
≤
28.5 Vdc, f = 120 Hz,
I
O
= 2.0 A, T
J
= 25°C)
Dropout Voltage (I
O
= 3.0 A, T
J
= +25°C)
Output Noise Voltage
(10 Hz
≤
f
≤
100 kHz, T
J
= +25°C)
Output Resistance (f = 1.0 kHz)
Short Circuit Current Limit
(V
in
= 40 Vdc, T
J
= +25°C)
Peak Output Current (T
J
= +25°C)
Average Temperature Coefficient of Output Voltage
(I
O
= 5.0 mA)
Symbol
V
O
14.7
14.4
Reg
line
–
15
15
7.5
15.3
15.6
55
14.4
14.25
–
15
15
7.5
15.6
15.75
55
mV
Min
Typ
Max
Min
MC78T15C
Typ
Max
Unit
Vdc
Reg
load
–
–
Reg
therm
I
B
–
–
∆I
B
–
3.5
4.0
0.3
5.0
6.0
1.0
–
–
–
3.5
4.0
0.3
5.0
6.0
1.0
–
10
15
0.001
30
80
0.01
–
–
–
10
15
0.002
30
80
0.03
mV
%V
O
/W
mA
mA
RR
55
65
–
55
65
–
dB
V
in
–V
O
V
n
R
O
I
SC
I
max
TCV
O
–
–
–
–
–
–
2.2
10
2.0
1.0
5.0
0.6
2.5
–
–
–
–
–
–
–
–
–
–
–
2.2
10
20
1.0
5.0
0.6
2.5
–
–
–
–
–
Vdc
µV/V
O
mΩ
A
A
mV/°C
NOTES:
1. Although power dissipation is internally limited, specifications apply only for P
O
≤
P
max
, P
max
= 25 W.
2. Line and load 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 cycle is used.
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