Motorola MC78T05ABT, MC78T15ACT, MC78T15BT, MC78T15CT, MC78T15ABT Datasheet

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Order this document by MC78T00/D

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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 Of fered 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

Input Voltage (5.0 V – 12 V)

Input Voltage (15 V)

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 T
Operating Junction Temperature Range

(MC78T00C, AC)

NOTES: 1.Although power dissipation is internally limited, specifications apply only

for PO ≤ P

(TA = +25°C, unless otherwise noted.)

Rating

, P

max

max

= 25 W.

Symbol Value Unit

R

R

V

I

P

Internally Limited

D

θJA

P

Internally Limited

D

θJC
stg

T

J

35
40

65

2.5

+150 °C

0 to +125 °C

Vdc

°C/W

°C/W

THREE–AMPERE

POSITIVE FIXED

VOLTAGE REGULATORS

SEMICONDUCTOR

TECHNICAL DATA

T SUFFIX

PLASTIC PACKAGE

CASE 221A

Pin 1. Input

2. Ground

3. Output

Heatsink surface is connected to Pin 2.

DEVICE TYPE/NOMINAL OUTPUT VOLTAGE

MC78T05
MC78T08

5.0 V

8.0 V

1

2

MC78T12
MC78T15

3

12 V
15 V

Simplified Application

Input

Cin*

µ

FC

0.33

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.

MC78TXX

Output

**

O

Device

MC78TXXCT
MC78TXXACT

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 Motorola sales office for
information.

 Motorola, Inc. 1996 Rev 1

MOTOROLA ANALOG IC DEVICE DATA

ORDERING INFORMATION

O

Operating

Temperature

Range

TJ = 0° to

+125°C

TJ = –40° to

+125°C

V

Tol.

4%

2%*

4%

2%*

Package

Plastic
Power

Plastic
Power

1

MC78T00 Series

ELECTRICAL CHARACTERISTICS

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)

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)

Load Regulation (Note 2)

(5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C)
(5.0 mA ≤ IO ≤ 3.0 A)

Thermal Regulation

(Pulse = 10 ms, P = 20 W, TA = +25°C)

Quiescent Current

(5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C)
(5.0 mA ≤ IO ≤ 3.0 A)

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)

Ripple Rejection

(8.0 Vdc ≤ Vin ≤ 18 Vdc, f = 120 Hz,

IO = 2.0 A, TJ = 25°C)
Dropout Voltage (IO = 3.0 A, TJ = +25°C) Vin–V
Output Noise Voltage

(10 Hz ≤ f ≤ 100 kHz, TJ = +25°C)
Output Resistance (f = 1.0 kHz) R
Short Circuit Current Limit

(Vin = 35 Vdc, TJ = +25°C)
Peak Output Current (TJ = +25°C) I
Average Temperature Coefficient of Output Voltage

(IO = 5.0 mA)

NOTES: 1. Although power dissipation is internally limited, specifications apply only for PO ≤ P

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.

(Vin = 10 V, IO = 3.0 A, 0°C ≤ TJ ≤ 125°C, PO ≤ P

MC78T05AC MC78T05C

V

O

Reg

line

Reg

load

Reg

therm

I

B

∆I

B

RR 62 75 – 62 75 – dB

V

n

O

I

SC

max

TCV

4.9

4.8

– 3.0 25 – 3.0 25 mV

–
–

– 0.001 0.01 – 0.002 0.03 %VO/W

–
–

– 0.3 1.0 – 0.3 1.0 mA

– 2.2 2.5 – 2.2 2.5 Vdc

O

– 10 – – 10 – µV/V

– 2.0 – – 20 – mΩ
– 1.5 – – 1.5 – A

– 5.0 – – 5.0 – A

O

– 0.2 – – 0.2 – mV/°C

5.0

5.0

10
15

3.5

4.0

max

, P

[Note 1], unless otherwise noted.)

max

max

5.1

5.2

30
80

5.0

6.0

= 25 W.

4.8

4.75

–
–

–
–

5.0

5.0

10
15

3.5

4.0

5.25

5.2

Vdc

mV
30
80

mA

5.0

6.0

O

2

MOTOROLA ANALOG IC DEVICE DATA

MC78T00 Series

ELECTRICAL CHARACTERISTICS (V

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)

Thermal Regulation

(Pulse = 10 ms, P = 20 W, TA = +25°C)

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)
Dropout Voltage (IO = 3.0 A, TJ = +25°C) Vin–V
Output Noise Voltage

(10 Hz ≤ f ≤ 100 kHz, TJ = +25°C)
Output Resistance (f = 1.0 kHz) R
Short Circuit Current Limit

(Vin = 35 Vdc, TJ = +25°C)
Peak Output Current (TJ = +25°C) I
Average Temperature Coefficient of Output Voltage (IO = 5.0 mA) TCV

NOTES: 1. Although power dissipation is internally limited, specifications apply only for PO ≤ P

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.

= 13 V, IO = 3.0 A, 0°C ≤ TJ ≤ 125°C, PO ≤ P

in

Reg

Reg

, P

max

[Note 1], unless otherwise noted.)

max

MC78T08C

V

O

Reg

line

load

therm

I

B

∆I

B

RR 60 71 – dB

V

n

O

I

SC

max

O

max

O

= 25 W.

7.7

7.6

– 4.0 35 mV

–
–

– 0.002 0.03 %VO/W

–
–

– 0.3 1.0 mA

– 2.2 2.5 Vdc
– 10 – µV/V

– 2.0 – mΩ
– 1.5 – A

– 5.0 – A
– 0.3 – mV/°C

8.0

8.0

10
15

3.5

4.0

8.3

8.4

5.0

6.0

Vdc

mV
30
80

mA

O

MOTOROLA ANALOG IC DEVICE DATA

3

MC78T00 Series

ELECTRICAL CHARACTERISTICS

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, 14.5 Vdc ≤ Vin ≤ 27 Vdc)

Line Regulation (Note 2)

(14.5 Vdc ≤ Vin ≤ 35 Vdc, IO = 5.0 mA, TJ = +25°C;

14.5 Vdc ≤ Vin ≤ 35 Vdc, IO = 1.0 A, TJ = +25°C;
16 Vdc ≤ Vin ≤ 22 Vdc, IO = 3.0 A, TJ = +25°C;

14.9 Vdc ≤ Vin ≤ 27 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)

Thermal Regulation

(Pulse = 10 ms, P = 20 W, TA = +25°C)

Quiescent Current

(5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C)
(5.0 mA ≤ IO ≤ 3.0 A)

Quiescent Current Change

(14.5 Vdc ≤ Vin ≤ 35 Vdc, IO = 5.0 mA, TJ = +25°C;

5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C;

14.9 Vdc ≤ Vin ≤ 27 Vdc, IO = 1.0 A)

Ripple Rejection

(15 Vdc ≤ Vin ≤ 25 Vdc, f = 120 Hz,

IO = 2.0 A, TJ = 25°C)
Dropout Voltage (IO = 3.0 A, TJ = +25°C) Vin – V
Output Noise Voltage

(10 Hz ≤ f ≤ 100 kHz, TJ = +25°C)
Output Resistance (f = 1.0 kHz) R
Short Circuit Current Limit

(Vin = 35 Vdc, TJ = +25°C)
Peak Output Current (TJ = +25°C) I
Average Temperature Coefficient

of Output Voltage (IO = 5.0 mA)

NOTES: 1. Although power dissipation is internally limited, specifications apply only for PO ≤ P

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.

(Vin = 17 V, IO = 3.0 A, 0°C ≤ TJ ≤ 125°C, PO ≤ P

MC78T12AC MC78T12C

V

O

Reg

line

Reg

load

Reg

therm

I

B

∆I

B

RR 57 67 – 57 67 – dB

V

n

O

I

SC

max

TCV

11.75

11.5

– 6.0 45 – 6.0 45 mV

–
–

– 0.001 0.01 – 0.002 0.03 %VO/W

–
–

– 0.3 1.0 – 0.3 1.0 mA

O

O

– 2.2 2.5 – 2.2 2.5 Vdc
– 10 – – 10 – µV/V

– 2.0 – – 20 – mΩ
– 1.5 – – 1.5 – A

– 5.0 – – 5.0 – A
– 0.5 – – 0.5 – mV/°C

3.5

4.0

max

12
12

10
15

, P

[Note 1], unless otherwise noted.)

max

max

12.25

12.5

30
80

5.0

6.0

= 25 W.

11.5

11.4

–
–

–
–

12
12

10
15

3.5

4.0

12.5

Vdc

12.6

mV
30
80

mA

5.0

6.0

O

4

MOTOROLA ANALOG IC DEVICE DATA