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www.fairchildsemi.com
MC78TXX
3-Terminal 3A Positive Voltage Regulator
Features
• Output Current in Excess of 3.0A
• Output Transistor Safe Operating Area Compensation
• Power Dissipation :25W
• Internal Short Circuit Current Limiting
• Internal Thermal Overload Protection
• Output Voltage Offered in 4% Tolerance
• No External Components Required
• Output Voltage of 5,12 and 15V
Description
This family of fixed voltage regulators are monolithic
integrated circuit capable of driving loads in excess of 3.0 A.
TO-220
GND
1
1.Input 2. GND 3. Output
Internal Block Diagram
INPUT
1
STARTING
CIRCUIT
CURRENT
GENERATOR
REFERENCE
VOLTAGE
SERIES
PASS
ELEMENT
SOA
PROTECTION
ERROR
AMPLIFIER
THERMAL
PROTECTION
OUTPUT
3
GND
2
©2002 Fairchild Semiconductor Corporation
Rev. 1.0.1

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MC78TXX
Absolute Maximum Ratings
Parameter
Input Voltage (for VO = 5V to 12V)
(for VO = 15V)
Power Dissipation
Thermal Resistance, Junction to Air (Note1, 2)
Ta = +25°C
Thermal Resistance, Junction to Case (Note1)
Tc = +25°C
Operating Junction Temperature Range
Storage Temperature Range
Note:
1. Thermal resistance test board
Size: 76.2mm * 114.3mm * 1.6mm(1S0P)
JEDEC standard: JESD51-3, JESD51-7
2. Assume no ambient airflow.
Symbol
VI
PD
RθJA
RθJC
TJ
TSTG
Value
35
40
Internally limited
65
2.5
0 ~ +125
-65 ~ +150
Unit
V
V
°C/W
°C/W
°C
°C
Electrical Characteristics(MC78T05)
(VI = 10V, IO = 3.0 A, 0°C TJ +125°C, Po PMAX (Note3), unless otherwise specified. )
Parameter
Symbol
Conditions
Output Voltage
Vo
5mA Io 3.0A , TJ = +25°C
7.3V VI 20V, 5mA Io 2.0A
Line Regulation (Note4)
VO
7.2V VI 35V , Io=5mA, TJ =+25°C
7.2V VI 35V , Io=1.0A, TJ = +25°C
7.5V VI 20V, Io =2.0A, TJ = +25°C
8.0V VI 12V, Io =3.0A, TJ = +25°C
Load Regulation (Note4)
VO
5mA Io 3.0A , TJ = +25°C
5mA Io 3.0A
Thermal Regulation
REGT
Pulse =10ms, P = 20W
TA = +25°C
Quiescent Current
IQ
5mA Io 3.0A , TJ = +25°C
5mA Io 3.0A
Quiescent Current Change
7.2V VI 35V, Io = 5mA
IQ
TJ = +25°C ;
7.5V VI 20V, Io =2.0A ;
5mA Io 3.0A, TJ = +25°C
Ripple Rejection
RR
f = 120Hz, 8V VI 18V, Io = 2.0A
TJ = +25°C
Dropout Voltage
VD Io = 3A ,TJ = +25°C
Output Noise Voltage
VN TA = +25°C, 10Hz f 100kHz
Peak Output Current
IPK TA = +25°C
Output Resistance
Ro f = 1.0kHz
Short Circuit Current Limit
Isc VI = 35V, TJ =+25°C
Average Temperature
Coefficient of Output Voltage
VO/T
Io = 5.0mA
Min.
4.8
4.75
Typ.
5.0
5.0
Max.
5.2
5.25
Unit
V
- 3.0 25 mV
-
10 30
15 80
mV
mV
- 0.002 0.03 %Vo/W
-
3.5 5.0
4.0 6.0
mA
mA
- 0.1 0.8 mA
- 75 -
dB
- 2.2 2.5
V
- 10 - µV/Vo
- 5.0 -
A
- 2.0 -
m
- 1.5 2.5
A
- 0.2 - mV/°C
Note:
3. Although power dissipation is internally limited, specifications apply only for PO Pmax, Pmax = 25W
4. Load and line regulation are specified at constant junction temperature. Change in Vo due heating effects must be taken into
account separately. Pulse testing with low duty is used.
2

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MC78TXX
Electrical Characteristics(MC78T12) (Continued)
(VI = 19V, IO = 3.0 A, 0°C TJ +125°C, Po PMAX (Note1), unless otherwise specified. )
Parameter
Symbol
Conditions
Output Voltage
Vo
5mA Io 3.0A , TJ =+25°C
14.5V VI 27V, 5mA Io 2.0A
Line Regulation (Note2)
VO
14.5V VI 35V, Io=5mA, TJ =+25°C
14.5V VI 35V, Io=1.0A, TJ =+25°C
14.9V VI 28V, Io =2.0A, TJ =+25°C
16V VI 22V, Io =3.0A, TJ =+25°C
Load Regulation (Note2)
VO
5mA Io 3.0A, TJ =+25°C
5mA Io 3.0A
Thermal Regulation
REGT
Pulse =10ms, P = 20W
TA = +25°C
Quiescent Current
IQ
5mA Io 3.0A, TJ =+25°C
5mA Io 3.0A
Quiescent Current Change
14.5V VI 35V, Io = 5mA
IQ TJ =+25°C ;
14.9V VI 27V, Io =2.0A ;
5mA Io 3.0A, TJ =+25°C
Ripple Rejection
RR
f = 120Hz, 15V VI 25V, Io = 2.0A
TJ =+25°C
Dropout Voltage
VD Io = 3A,TJ =+25°C
Output Noise Voltage
VN TA =+25°C, 10Hz f 100kHz
Peak Output Current
IPK TA =+25°C
Output Resistance
Ro f = 1.0kHz
Short Circuit Current Limit
Isc VI = 35V, TJ =+25°C
Average Temperature
Coefficient of Output Voltage
VO/T
Io = 5.0mA
Min.
11.5
11.4
-
-
-
-
-
-
-
-
-
-
-
-
Typ.
12
12
Max.
12.5
12.8
Unit
V
6.0 45 mV
10 30 mV
15 80 mV
0.002 0.03 %Vo/W
3.5 5.0
4.0 6.0
mA
mA
0.1 0.8 mA
67 -
dB
2.2 2.5
V
10 - µV/Vo
5.0 -
A
2.0 -
m
1.5 2.5
A
0.5 - mV/°C
Note:
1. Although power dissipation is internally limited, specifications apply only for PO Pmax, Pmax = 25W
2. Load and line regulation are specified at constant junction temperature. Change in Vo due heating effects must be taken into
account separately. Pulse testing with low duty is used. ( PMAX = 25W)
3