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Order this document by MC78T00/D
Three-Ampere 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
MAXIMUM RATINGS (TA = +25°C, unless otherwise noted.)
Rating
Symbol
Value
Unit
Input Voltage (5.0 V – 12 V)
Input Voltage (15 V)
VI 35 Vdc
40
Power Dissipation and Thermal Characteristics
Plastic Package (Note 1)
TA = +25°C
Thermal Resistance, Junction–to–Air
TC = +25°C
Thermal Resistance, Junction–to–Case
Storage Junction Temperature
Operating Junction Temperature Range
(MC78T00C, AC)
PD
RθJA
PD
RθJC
Tstg
TJ
Internally Limited
65 °C/W
Internally Limited
2.5 °C/W
+150
°C
0 to +125
°C
NOTES: 1. Although power dissipation is internally limited, specifications apply only
for PO Pmax, Pmax = 25 W.
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
Simplified Application
Input
Cin*
0.33µF
MC78TXX
Output
CO**
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.
** Cin is required if regulator is located an appreciable distance from power supply filter.
** (See Applications Information for details.)
** CO is not needed for stability; however, it does improve transient response.
MOTOROLA ANALOG IC DEVICE DATA
Device
Operating
VO Temperature
Tol. Range Package
MC78TXXCT
4%
MC78TXXACT 2%*
TJ = 0° to
+125°C
Plastic
Power
MC78TXXBT# 4%
MC78TXXABT# 2%*
TJ = – 40° to Plastic
+125°C
Power
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 Motorola sales office for
information.
© Motorola, Inc. 1996
Rev 1
1

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MC78T00 Series
ELECTRICAL CHARACTERISTICS (Vin = 10 V, IO = 3.0 A, 0°C TJ 125°C, PO Pmax [Note 1], unless otherwise noted.)
MC78T05AC
MC78T05C
Characteristics
Symbol Min Typ Max Min Typ Max
Unit
Output Voltage
(5.0 mA IO 3.0 A, TJ = +25°C)
(5.0 mA IO 3.0 A;
5.0 mA IO 2.0 A, 7.3 Vdc Vin 20 Vdc)
VO
4.9 5.0 5.1 4.8 5.0 5.2
4.8 5.0 5.2 4.75 5.0 5.25
Line Regulation (Note 2)
(7.2 Vdc Vin 35 Vdc, IO = 5.0 mA, TJ = +25°C;
7.2 Vdc Vin 35 Vdc, IO = 1.0 A, TJ = +25°C;
8.0 Vdc Vin 12 Vdc, IO = 3.0 A, TJ = +25°C;
7.5 Vdc Vin 20 Vdc, IO = 1.0 A)
Regline
3.0 25
– 3.0 25
Load Regulation (Note 2)
(5.0 mA IO 3.0 A, TJ = +25°C)
(5.0 mA IO 3.0 A)
Regload
– 10 30 – 10 30
– 15 80 – 15 80
Vdc
mV
mV
Thermal Regulation
(Pulse = 10 ms, P = 20 W, TA = +25°C)
Regtherm
0.001 0.01
– 0.002 0.03 %VO/W
Quiescent Current
(5.0 mA IO 3.0 A, TJ = +25°C)
(5.0 mA IO 3.0 A)
IB mA
– 3.5 5.0 – 3.5 5.0
– 4.0 6.0 – 4.0 6.0
Quiescent Current Change
(7.2 Vdc Vin 35 Vdc, IO = 5.0 mA, TJ = +25°C;
5.0 mA IO 3.0 A, TJ = +25°C;
7.5 Vdc Vin 20 Vdc, IO = 1.0 A)
IB
– 0.3 1.0 – 0.3 1.0
mA
Ripple Rejection
(8.0 Vdc Vin 18 Vdc, f = 120 Hz,
IO = 2.0 A, TJ = 25°C)
RR 62 75 – 62 75 –
dB
Dropout Voltage (IO = 3.0 A, TJ = +25°C)
Vin–VO
2.2 2.5
– 2.2 2.5
Vdc
Output Noise Voltage
(10 Hz f 100 kHz, TJ = +25°C)
Vn
– 10 –
– 10 – µV/VO
Output Resistance (f = 1.0 kHz)
Short Circuit Current Limit
(Vin = 35 Vdc, TJ = +25°C)
RO
– 2.0 –
– 20 –
m
ISC
– 1.5 –
– 1.5 –
A
Peak Output Current (TJ = +25°C)
Imax
– 5.0 –
Average Temperature Coefficient of Output Voltage TCVO – 0.2 –
(IO = 5.0 mA)
– 5.0 –
A
– 0.2 – mV/°C
NOTES: 1. Although power dissipation is internally limited, specifications apply only for PO Pmax, Pmax = 25 W.
2. Line and load regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately.
Pulse testing with low duty cycle is used.
2 MOTOROLA ANALOG IC DEVICE DATA

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MC78T00 Series
ELECTRICAL CHARACTERISTICS (Vin = 13 V, IO = 3.0 A, 0°C TJ 125°C, PO Pmax [Note 1], unless otherwise noted.)
MC78T08C
Characteristics
Symbol Min Typ Max
Unit
Output Voltage
(5.0 mA IO 3.0 A, TJ = +25°C)
(5.0 mA IO 3.0 A;
5.0 mA IO 2.0 A, 10.4 Vdc Vin 23 Vdc)
Line Regulation (Note 2)
(10.3 Vdc Vin 35 Vdc, IO = 5.0 mA, TJ = +25°C
10.3 Vdc Vin 35 Vdc, IO = 1.0 A, TJ = +25°C
11 Vdc Vin 17 Vdc, IO = 3.0 A, TJ = +25°C
10.7 Vdc Vin 23 Vdc, IO = 1.0 A)
Load Regulation (Note 2)
(5.0 mA IO 3.0 A, TJ = +25°C)
(5.0 mA IO 3.0 A)
VO
7.7 8.0 8.3
7.6 8.0 8.4
Regline
4.0 35
Vdc
mV
Regload
10 30
15 80
mV
Thermal Regulation
(Pulse = 10 ms, P = 20 W, TA = +25°C)
Regtherm
0.002 0.03 %VO/W
Quiescent Current
(5.0 mA IO 3.0 A, TJ = +25°C)
(5.0 mA IO 3.0 A)
Quiescent Current Change
(10.3 Vdc Vin 35 Vdc, IO = 5.0 mA, TJ = +25°C;
5.0 mA IO 3.0 A, TJ = +25°C;
10.7 Vdc Vin 23 Vdc, IO = 1.0 A)
Ripple Rejection
(11 Vdc Vin 21 Vdc, f = 120 Hz, IO = 2.0 A, TJ = 25°C)
IB mA
– 3.5 5.0
– 4.0 6.0
IB
– 0.3 1.0
mA
RR
60 71
dB
Dropout Voltage (IO = 3.0 A, TJ = +25°C)
Output Noise Voltage
(10 Hz f 100 kHz, TJ = +25°C)
Output Resistance (f = 1.0 kHz)
Short Circuit Current Limit
(Vin = 35 Vdc, TJ = +25°C)
Peak Output Current (TJ = +25°C)
Average Temperature Coefficient of Output Voltage (IO = 5.0 mA)
Vin–VO
Vn
RO
ISC
Imax
TCVO
2.2 2.5
Vdc
10 – µV/VO
2.0 –
1.5 –
m
A
5.0 –
A
0.3 – mV/°C
NOTES: 1. Although power dissipation is internally limited, specifications apply only for PO Pmax, Pmax = 25 W.
2. Line and load regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately.
Pulse testing with low duty cycle is used.
MOTOROLA ANALOG IC DEVICE DATA
3