Datasheet MC78M24CT, MC78M15CT, MC78M20CT, MC78M24CDT, MC78M20CDT Datasheet (Motorola)

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Order this document by MC78M00/D

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The MC78M00/MC78M00A Series positive voltage regulators are
identical to the popular MC7800 Series devices, except that they are
specified for only half the output current. Like the MC7800 devices, the
MC78M00 three–terminal regulators are intended for local, on–card voltage
regulation.

Internal current limiting, thermal shutdown circuitry and safe–area
compensation for the internal pass transistor combine to make these
devices remarkably rugged under most operating conditions. Maximum
output current, with adequate heatsinking is 500 mA.

• No External Components Required

• Internal Thermal Overload Protection

• Internal Short Circuit Current Limiting

• Output Transistor Safe–Area Compensation

• MC78M00A High Accuracy (±2%) Available for 5.0 V, 8.0 V, 12 V

and 15 V

• Previous Commerical Temperature Range has been extended to a

Junction Temperature Range of –40°C to +125°C

Representative Schematic Diagram

1.0 k 1.0 k

300

3.6
k

6.4
k

520

2.6 k

2.0 k 3.9 k

6.0 k

5.6 k

1.0 k

3.0 k

40
pF

6.7

210

16 k

V

100

200

300

10 pF

20050

Input

0.24

13

Output

THREE–TERMINAL MEDIUM

CURRENT POSITIVE FIXED

VOLTAGE REGULATORS

SEMICONDUCTOR

TECHNICAL DATA

T SUFFIX

PLASTIC PACKAGE

CASE 221A

(TO–220)

Heatsink surface

connected to Pin 2.

1

2

Pin 1. Input

2. Ground

3. Output

1

3

DT SUFFIX

PLASTIC PACKAGE

CASE 369A

(DPAK)

Heatsink surface (shown as terminal 4 in

case outline drawing) is connected to Pin 2.

3

1

2

3

DT–1 SUFFIX

PLASTIC PACKAGE

CASE 369

(DPAK)

6.0
k

This device contains 28 active transistors.

2.8 k
Gnd

DEVICE TYPE/NOMINAL OUTPUT VOLTAGE

MC78M05AC 5.0 V MC78M09C 9.0 V MC78M18C 18 V
MC78M05C 5.0 V MC78M12AC 12 V MC78M20C 20 V
MC78M06C 6.0 V MC78M12C 12 V MC78M24C 24 V
MC78M08AC 8.0 V MC78M15AC 15 V
MC78M08C 8.0 V MC78M15C 15 V

MOTOROLA ANALOG IC DEVICE DATA

ORDERING INFORMATION

Operating

Device

MC78MXXCDT
MC78MXXACDT*
MC78MXXCT
MC78MXXACT*

XX Indicates nominal voltage.
* Available in 5.0, 8.0, 12 and 15 V devices.

 Motorola, Inc. 1997 Rev 6

Temperature Range

TJ = – 40° to +125°C

Package

DPAK

TO–220

1

MC78M00 MC78M00A Series

MAXIMUM RATINGS (T

Input Voltage (5.0 V–18 V) V

(20 V–24V) 40

Power Dissipation (Package Limitation)

Plastic Package, T Suffix

TA = 25°C P

Thermal Resistance, Junction–to–Air θ
Thermal Resistance, Junction–to–Case θ

Plastic Package, DT Suffix

TA = 25°C P

Thermal Resistance, Junction–to–Air θ

Thermal Resistance, Junction–to–Case θ
Operating Junction Temperature Range T
Storage Temperature Range T

NOTE: ESD data available upon request.

MC78M05C/AC ELECTRICAL CHARACTERISTICS (V

unless otherwise noted.)

Output Voltage (TJ = 25°C) V

MC78M05C 4.8 5.0 5.2

MC78M05AC 4.9 5.0 5.1
Output Voltage Variation V

(7.0 Vdc ≤ VI ≤ 20 Vdc, 5.0 mA ≤ IO ≤ 350 mA)

MC78M05C 4.75 – 5.25

MC78M05AC 4.80 – 5.20
Line Regulation Reg

(TJ = 25°C, 7.0 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA)

Load Regulation Reg

(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) – 20 100

(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) – 10 50
Input Bias Current (TJ = 25°C) I
Quiescent Current Change ∆I

(8.0 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA) – – 0.8

(5.0 mA ≤ IO ≤ 350 mA) – – 0.5
Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) V
Ripple Rejection RR dB

(IO = 100 mA, f = 120 Hz, 8.0 V ≤ VI ≤ 18 V) 62 – –

(IO = 300 mA, f = 120 Hz, 8.0 ≤ VI ≤ 18 V, TJ = 25°C) 62 80 –
Dropout Voltage VI–V

(TJ = 25°C)
Short Circuit Current Limit (TJ = 25°C, VI = 35 V) I
Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.2 – mV/°C

(IO = 5.0 mA)
Peak Output Current I

(TJ = 25°C)

= 25°C, unless otherwise noted.)

A

Rating Symbol Value Unit

35 Vdc

Internally Limited

70 °C/W

5.0 °C/W

Internally Limited

92 °C/W

5.0 °C/W

+150 °C

–65 to +150 °C

Symbol Min Typ Max Unit

IB

OS

O

Characteristics

I

D

JA

JC

D

JA
JC

J

stg

= 10 V, IO = 350 mA, –40°C < TJ < 125°C, PD ≤ 5.0 W,

I

O

O

line

load

IB

n

O

Vdc

Vdc

– 3.0 5.0 mV

mV

– 3.2 6.0 mA

mA

– 40 – µV

– 2.0 – Vdc

– 50 – mA

– 700 – mA

2

MOTOROLA ANALOG IC DEVICE DATA

MC78M00 MC78M00A Series

MC78M06C ELECTRICAL CHARACTERISTICS (V

Characteristics

Output Voltage (TJ = 25°C) V
Output Voltage Variation V

(8.0 Vdc ≤ VI ≤ 21 Vdc, 5.0 mA ≤ IO ≤ 350 mA)
Line Regulation Reg

(TJ = 25°C, 8.0 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA)
Load Regulation Reg

(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) – 20 120

(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) – 10 60
Input Bias Current (TJ = 25°C) I

Quiescent Current Change ∆I

(9.0 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA) – – 0.8

(5.0 mA ≤ IO ≤ 350 mA) – – 0.5
Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) V
Ripple Rejection RR dB

(IO = 100 mA, f = 120 Hz, 9.0 V ≤ VI ≤ 19 V) 59 – –

(IO = 300 mA, f = 120 Hz, 9.0 V ≤ VI ≤ 19 V, TJ = 25°C) 59 80 –
Dropout Voltage VI – V

(TJ = 25°C)
Short Circuit Current Limit (TJ = 25°C, VI = 35 V) I
Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.2 – mV/°C

(IO = 5.0 mA)
Peak Output Current I

(TJ = 25°C)

= 11 V, IO = 350 mA, –40°C < TJ < 125°C, PD ≤ 5.0 W, unless otherwise noted.)

I

Symbol Min Typ Max Unit

O
O

line

load

IB

IB

n

OS

O

5.75 6.0 6.25 Vdc

5.7 – 6.3 Vdc

– 5.0 50 mV

– 3.2 6.0 mA

– 45 – µV

O

– 2.0 – Vdc

– 50 – mA

– 700 – mA

mV

mA

MC78M08C/AC ELECTRICAL CHARACTERISTICS (V

unless otherwise noted.)

Characteristics

Output Voltage (TJ = 25°C) V

MC78M08C 7.70 8.0 8.30

MC78M08AC 7.84 8.0 8.16
Output Voltage Variation V

(10.5 Vdc ≤ VI ≤ 23 Vdc, 5.0 mA ≤ IO ≤ 350 mA)

MC78M08C 7.6 – 8.4
MC78M08AC 7.7 – 8.3

Line Regulation Reg

(TJ = 25°C, 10.5 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA)
Load Regulation Reg

(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) – 25 160

(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) – 10 80
Input Bias Current (TJ = 25°C) I
Quiescent Current Change ∆I

(10.5 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA) – – 0.8

(5.0 mA ≤ IO ≤ 350 mA) – – 0.5
Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) V
Ripple Rejection RR dB

(IO = 100 mA, f = 120 Hz, 11.5 V ≤VI ≤ 21.5 V) 56 – –

(IO = 300 mA, f = 120 Hz, 11.5 V ≤VI ≤ 21.5 V , TJ = 25°C) 56 80 –
Dropout Voltage VI–V

(TJ = 25°C)
Short Circuit Current Limit (TJ = 25°C, VI = 35 V) I
Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.2 – mV/°C

(IO = 5.0 mA)
Peak Output Current I

(TJ = 25°C)

= 14 V, IO = 350 mA, –40°C < TJ < 125°C, PD ≤ 5.0 W,

I

Symbol Min Typ Max Unit

O

O

line

load

IB

IB

n

O

OS

O

– 6.0 50 mV

– 3.2 6.0 mA

– 52 – µV

– 2.0 – Vdc

– 50 – mA

– 700 – mA

Vdc

Vdc

mV

mA

MOTOROLA ANALOG IC DEVICE DATA

3

MC78M00 MC78M00A Series

MC78M09C ELECTRICAL CHARACTERISTICS (V

Characteristics Symbol Min Typ Max Unit

Output Voltage (TJ = 25°C) V
Output Voltage Variation V

(11.5 Vdc ≤ VI ≤ 23 Vdc, 5.0 mA ≤ IO ≤ 350 mA)
Line Regulation Reg

(TJ = 25°C, 11.5 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA)
Load Regulation Reg

(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) – 25 180

(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) – 10 90
Input Bias Current (TJ = 25°C) I
Quiescent Current Change ∆I

(11.5 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA) – – 0.8

(5.0 mA ≤ IO ≤ 350 mA) – – 0.5
Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) V
Ripple Rejection RR dB

(IO = 100 mA, f = 120 Hz, 12.5 V ≤VI ≤ 22.5 V) 56 – –

(IO = 300 mA, f = 120 Hz, 12.5 V ≤VI ≤ 22.5 V , TJ = 25°C) 56 80 –
Dropout Voltage VI–V

(TJ = 25°C)
Short Circuit Current Limit (TJ = 25°C, VI = 35 V) I
Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.2 – mV/°C

(IO = 5.0 mA)
Peak Output Current I

(TJ = 25°C)

= 15 V, IO = 350 mA, –40°C < TJ < 125°C, PD ≤ 5.0 W, unless otherwise noted.)

I

O
O

line

load

IB

IB

n

OS

O

8.64 9.0 9.45 Vdc

8.55 – 9.45 Vdc

– 6.0 50 mV

– 3.2 6.0 mA

– 52 – µV

O

– 2.0 – Vdc

– 50 – mA

– 700 – mA

mV

mA

MC78M12C/AC ELECTRICAL CHARACTERISTICS (V

unless otherwise noted.)

Characteristics

Output Voltage (TJ = 25°C) V

MC78M12C 11.50 12 12.50

MC78M12AC 11.76 12 12.24
Output Voltage Variation V

(14.5 Vdc ≤ VI ≤ 27 Vdc, 5.0 mA ≤ IO ≤ 350 mA)

MC78M12C 11.4 – 12.6
MC78M12AC 11.5 – 12.5

Line Regulation Reg

(TJ = 25°C, 14.5 Vdc ≤ VI ≤ 30 Vdc, IO = 200 mA)
Load Regulation Reg

(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) – 25 240

(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) – 10 120
Input Bias Current (TJ = 25°C) I

Quiescent Current Change ∆I

(14.5 Vdc ≤ VI ≤ 30 Vdc, IO = 200 mA) – – 0.8

(5.0 mA ≤ IO ≤ 350 mA) – – 0.5
Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) V

Ripple Rejection RR dB

(IO = 100 mA, f = 120 Hz, 15 V ≤VI ≤ 25 V) 55 – –

(IO = 300 mA, f = 120 Hz, 15 V ≤VI ≤ 25 V, TJ = 25°C) 55 80 –
Dropout Voltage VI–V

(TJ = 25°C)
Short Circuit Current Limit (TJ = 25°C, VI = 35 V) I

Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.3 – mV/°C

(IO = 5.0 mA)
Peak Output Current I

(TJ = 25°C)

= 19 V, IO = 350 mA, –40°C < TJ < 125°C, PD ≤ 5.0 W,

I

Symbol Min Typ Max Unit

O

O

line

load

IB

IB

n

O

OS

O

– 8.0 50 mV

– 3.2 6.0 mA

– 75 – µV

– 2.0 – Vdc

– 50 – mA

– 700 – mA

Vdc

Vdc

mV

mA

4

MOTOROLA ANALOG IC DEVICE DATA

MC78M00 MC78M00A Series

MC78M15C/AC ELECTRICAL CHARACTERISTICS (V

unless otherwise noted.)

Characteristics

Output Voltage (TJ = 25°C) V

MC78M15C 14.4 15 15.6

MC78M15AC 14.7 15 15.3
Output Voltage Variation V

(17.5 Vdc ≤ VI ≤ 30 Vdc, 5.0 mA ≤ IO ≤ 350 mA)

MC78M15C 14.25 – 15.75
MC78M15AC 14.40 – 15.60

Input Regulation Reg

(TJ = 25°C, 17.5 Vdc ≤ VI ≤ 30 Vdc, IO = 200 mA)
Load Regulation Reg

(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) – 25 300

(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) – 10 150
Input Bias Current (TJ = 25°C) I

Quiescent Current Change ∆I

(17.5 Vdc ≤ VI ≤ 30 Vdc, IO = 200 mA) – – 0.8

(5.0 mA ≤ IO ≤ 350 mA) – – 0.5
Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) V

Ripple Rejection RR dB

(IO = 100 mA, f = 120 Hz, 18.5 V ≤ VI ≤ 28.5 V) 54 – –

(IO = 300 mA, f = 120 Hz, 18.5 V ≤ VI ≤ 28.5 V , TJ = 25°C) 54 70 –
Dropout Voltage VI–V

(TJ = 25°C)
Short Circuit Current Limit (TJ = 25°C, VI = 35 V) I

Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.3 – mV/°C

(IO = 5.0 mA)
Peak Output Current I

(TJ = 25°C)

= 23 V, IO = 350 mA, –40°C < TJ < 125°C, PD ≤ 5.0 W,

I

Symbol Min Typ Max Unit

O

O

line

load

IB

IB

n

O

OS

O

– 10 50 mV

– 3.2 6.0 mA

– 90 – µV

– 2.0 – Vdc

– 50 – mA

– 700 – mA

Vdc

Vdc

mV

mA

MC78M18C ELECTRICAL CHARACTERISTICS (V

Characteristics

Output Voltage (TJ = 25°C) V
Output Voltage Variation V

(21 Vdc ≤ VI ≤ 33 Vdc, 5.0 mA ≤ IO ≤ 350 mA)
Line Regulation Reg

(TJ = 25°C, 21 Vdc ≤ VI ≤ 33 Vdc, IO = 200 mA)
Load Regulation Reg

(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) – 30 360

(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) – 10 180
Input Bias Current (TJ = 25°C) I
Quiescent Current Change ∆I

(21 Vdc ≤ VI ≤ 33 Vdc, IO = 200 mA) – – 0.8

(5.0 mA ≤ IO ≤ 350 mA) – – 0.5
Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) V
Ripple Rejection RR dB

(IO = 100 mA, f = 120 Hz, 22 V ≤ VI ≤ 32 V) 53 – –

(IO = 300 mA, f = 120 Hz, 22 V ≤ VI ≤ 32 V, TJ = 25°C) 53 70 –
Dropout Voltage VI–V

(TJ = 25°C)
Short Circuit Current Limit (TJ = 25°C, VI = 35 V) I
Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.3 – mV/°C

(IO = 5.0 mA)
Peak Output Current I

(TJ = 25°C)

= 27 V, IO = 350 mA, –40°C < TJ < 125°C, PD ≤ 5.0 W, unless otherwise noted.)

I

Symbol Min Typ Max Unit

O
O

line

load

IB

IB

n

OS

O

17.3 18 18.7 Vdc

17.1 – 18.9 Vdc

– 10 50 mV

– 3.2 6.5 mA

– 100 – µV

O

– 2.0 – Vdc

– 50 – mA

– 700 – mA

mV

mA

MOTOROLA ANALOG IC DEVICE DATA

5

MC78M00 MC78M00A Series

MC78M20C ELECTRICAL CHARACTERISTICS (V

Characteristics Symbol Min Typ Max Unit

Output Voltage (TJ = 25°C) V
Output Voltage Variation V

(23 Vdc ≤ VI ≤ 35 Vdc, 5.0 mA ≤ IO ≤ 350 mA)
Line Regulation Reg

(TJ = 25°C, 23 Vdc ≤ VI ≤ 35 Vdc, IO = 200 mA)
Load Regulation Reg

(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) – 30 400

(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) – 10 200
Input Bias Current (TJ = 25°C) I
Quiescent Current Change ∆I

(23 Vdc ≤ VI ≤ 35 Vdc, IO = 200 mA) – – 0.8

(5.0 mA ≤ IO ≤ 350 mA) – – 0.5
Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) V
Ripple Rejection RR dB

(IO = 100 mA, f = 120 Hz, 24 V ≤ VI ≤ 34 V) 52 – –

(IO = 300 mA, f = 120 Hz, 24 V ≤ VI ≤ 34 V, TJ = 25°C) 52 70 –
Dropout Voltage VI–V

(TJ = 25°C)
Short Circuit Current Limit (TJ = 25°C, VI = 35 V) I
Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.5 – mV/°C

(IO = 5.0 mA)
Peak Output Current I

(TJ = 25°C)

= 29 V, IO = 350 mA, –30°C < TJ < 125°C, PD ≤ 5.0 W, unless otherwise noted.)

I

O
O

line

load

IB

IB

n

OS

O

19.2 20 20.8 Vdc
19 – 21 Vdc

– 10 50 mV

– 3.2 6.5 mA

– 110 – µV

O

– 2.0 – Vdc

– 50 – mA

– 700 – mA

mV

mA

MC78M24C ELECTRICAL CHARACTERISTICS (V

Characteristics Symbol Min Typ Max Unit

Output Voltage (TJ = 25°C) V
Output Voltage Variation V

(27 Vdc ≤ VI ≤ 38 Vdc, 5.0 mA ≤ IO ≤ 350 mA)

Line Regulation Reg

(TJ = 25°C, 27 Vdc ≤ VI ≤ 38 Vdc, IO = 200 mA)

Load Regulation Reg

(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) – 30 480

(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) – 10 240
Input Bias Current (TJ = 25°C) I
Quiescent Current Change ∆I

(27 Vdc ≤ VI ≤ 38 Vdc, IO = 200 mA) – – 0.8

(5.0 mA ≤ IO ≤ 350 mA) – – 0.5
Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) V
Ripple Rejection RR dB

(IO = 100 mA, f = 120 Hz, 28 V ≤ VI ≤ 38 V) 50 – –

(IO = 300 mA, f = 120 Hz, 28 V ≤ VI ≤ 38 V, TJ = 25°C) 50 70 –
Dropout Voltage VI–V

(TJ = 25°C)
Short Circuit Current Limit (TJ = 25°C) I
Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.5 – mV/°C

(IO = 5.0 mA)
Peak Output Current I

(TJ = 25°C)

= 33 V, IO = 350 mA, –40°C < TJ < 125°C, PD ≤ 5.0 W, unless otherwise noted.)

I

O
O

line

load

IB

IB

n

O

OS

O

23 24 25 Vdc

22.8 – 25.2 Vdc

– 10 50 mV

mV

– 3.2 7.0 mA

mA

– 170 – µV

– 2.0 – Vdc

– 50 – mA

– 700 – mA

6

MOTOROLA ANALOG IC DEVICE DATA

MC78M00 MC78M00A Series

DEFINITIONS

Line Regulation – The change in output voltage for a

change in the input voltage. The measurement is made under
conditions of low dissipation or by using pulse techniques
such that the average chip temperature is not significantly
affected.

Load Regulation – The change in output voltage for a

change in load current at constant chip temperature.

Maximum Power Dissipation – The maximum total
device dissipation for which the regulator will operate within
specifications.

Figure 1. DP AK Thermal Resistance and Maximum

Power Dissipation versus P.C.B. Copper Length

100

90

°

80

70

60

JA

JUNCTION–TO–AIR ( C/W)

θ

50

R , THERMAL RESISTANCE

40

Free Air
Mounted
Vertically

Minimum
Size Pad

0 10203025155.0

L, LENGTH OF COPPER (mm)

Input Bias Current – That part of the input current that is

not delivered to the load.

Output Noise Voltage – The rms AC voltage at the
output, with constant load and no input ripple, measured over
a specified frequency range.

Long Term Stability – Output voltage stability under
accelerated life test conditions with the maximum rated
voltage listed in the devices’ electrical characteristics and
maximum power dissipation.

P

D(max)

R

θ

for TA = 50°C

JA

2.0 oz. Copper
L

L

2.4

2.0

1.6

1.2

0.8

0.4

0

, MAXIMUM POWER DISSIPATION (W)

D

P

Figure 2. Worst Case Power Dissipation

versus Ambient T emperature (TO–220)

10

5.0

3.0

2.0

1.0

0.5

, POWER DISSIPATION (W)

0.3

D

P

0.2

0.1
25 50 75 100 125 150

θHS = 20°C/W

θJC = 5°C/W

P

= 7.52 W

D(max)

TA, AMBIENT TEMPERATURE (

θHS = 10°C/W

No Heat Sink

°

C)

Infinite Heat
Sink

MOTOROLA ANALOG IC DEVICE DATA

7

MC78M00 MC78M00A Series

Figure 3. Peak Output Current versus

Dropout Voltage

1.0

0.9

0.8

0.7

0.6

0.5
TJ = 125°C

0 5.0 10 15 20 25 30 35 40

, OUTPUT CURRENT (A)

O

I

0.4

0.3

0.2

0.1

0

TJ = 25°C

VI – VO, DROPOUT VOLTAGE (V)

2.5

2.0

1.5

1.0

, DROPOUT VOLTAGE (V)
–VV

0.5

IO

0

0 25 50 75 100 125 150

Figure 4. Dropout Voltage versus

Junction T emperature

IO = 500 mA

IO = 100 mA
IO = 10 mA

∆

VO = 100 mV

TJ, JUNCTION TEMPERATURE (°C)

Figure 5. Ripple Rejection versus Frequency Figure 6. Ripple Rejection versus Output Current

100

80

I

= 500 mA

out

100

80

I

= 500 mA

60

40

RR, RIPPLE REJECTION (dB)

20

1.0 10 100 1.0 k 10 k 100 k 1.0 M 10 M 100 M

out

V

= 5.0 V

out

Vin = 10 V
CO = 0

°

C

TJ = 25

f, FREQUENCY (Hz)

Figure 7. Bias Current versus Input V oltage

4.0

3.0

2.0

, BIAS CURRENT (mA)

B

I

1.0

TJ = 125°C

TJ = 25°C

TJ = 125°C

TJ = 25°C

VO = 5.0 V
IO = 0.5 A

V

= 5.0 V

60

RR, RIPPLE REJECTION (dB)

40
30

0.01 0.1 0.5 1.0 10

out

Vin = 10 V
CO = 0
f = 120 Hz

°

C

TJ = 25

IO, OUTPUT CURRENT (A)

Figure 8. Bias Current versus Output Current

5.0

4.0

3.0

2.0

, BIAS CURRENT (mA)

B

I

1.0

TJ = 25°C

TJ = 125°C

VI–VO = 5.0 V

0

0 5.0 10 15 20 25 30 35 40

VI, INPUT VOLTAGE (Vdc)

8

0

0.01 0.1 0.5 1.0 10
IO, OUTPUT CURRENT (A)

MOTOROLA ANALOG IC DEVICE DATA

Design Considerations

MC78M00 MC78M00A Series

APPLICATIONS INFORMATION

The MC78M00/MC78M00A Series of fixed voltage
regulators are designed with Thermal Overload Protection
that shuts down the circuit when subjected to an excessive
power overload condition, Internal Short Circuit Protection
that limits the maximum current the circuit will pass, and
Output Transistor Safe–Area Compensation that reduces the
output short circuit current as the voltage across the pass
transistor is increased.

In many low current applications, compensation
capacitors are not required. However, it is recommended that
the regulator input be bypassed with a capacitor if the
regulator is connected to the power supply filter with long wire

Figure 9. Current Regulator Figure 10. Adjustable Output Regulator

Input

0.33

µ

F

The MC78M00 regulators can also be used as a current source
when connected as above. In order to minimize dissipation the
MC78M05C is chosen in this application. Resistor R determines
the current as follows:

MC78M05C

5.0 V

IO =

R

+ I

R

Constant
Current to
Grounded

I

O

Load

IB

lengths, or if the output load capacitance is large. An input
bypass capacitor should be selected to provide good high
frequency characteristics to insure stable operation under all
load conditions. A 0.33 µF or larger tantalum, mylar, or other
capacitor having low internal impedance at high frequencies
should be chosen. The bypass capacitor should be mounted
with the shortest possible leads directly across the
regulator’s input terminals. Normally good construction
techniques should be used to minimize ground loops and
lead resistance drops since the regulator has no external
sense lead.

VO, 7.0 V to 20 V

≥

out

10 k

2.0 V
Output

0.1 µF

Input

0.33

µ

MC78M05C

F

1.0 k

Vin–V

7

6

4

2

*

3

+

MC1741

IIB = 1.5 mA over line and load changes.

For example, a 500 mA current source would require R to be a

Ω

, 10 W resistor and the output voltage compliance would

5.0
be the input voltage less 7.0 V.

Figure 11. Current Boost Regulator

MJ2955 or Equiv.

Input

R

1.0

µ

F

XX = 2 digits of type number indicating voltage.

The MC78M00 series can be current boosted with a PNP
transistor. The MJ2955 provides current to 5.0 A. Resistor R in
conjunction with the VBE of the PNP determines when the pass
transistor begins conducting; this circuit is not short circuit
proof. Input–output differential voltage minimum is increased
by VBE of the pass transistor.

MC78MXXC

Output

1.0 µF

The addition of an operational amplifier allows adjustment to higher
or intermediate values while retaining regulation characteristics.
The minimum voltage obtainable with this arrangement is 2.0 V
greater than the regulator voltage.

Figure 12. Current Boost with

Short Circuit Protection

MJ2955
or Equiv.

Input

The circuit of Figure NO TAG can be modified to provide supply
protection against short circuits by adding a short circuit sense
resistor, Rsc, and an additional PNP transistor. The current sensing
PNP must be able to handle the short circuit current of the
three–terminal regulator .Therefore, a 4.0 A plastic power transistor
is specified.

R

SC

2N6049
or Equiv.

R

1.0 µF

XX = 2 digits of type number indicating voltage.

MC78MXXC

Output

MOTOROLA ANALOG IC DEVICE DATA

9

MC78M00 MC78M00A Series

OUTLINE DIMENSIONS

T SUFFIX

PLASTIC PACKAGE

CASE 221A–06

(TO–220)

ISSUE Y

SEATING

–T–

PLANE

B

4

Q

123

F

T

A

U

C

S

H

K

Z

L

V

R
J

G

D

N

NOTES:

1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.

2. CONTROLLING DIMENSION: INCH.

3. DIMENSION Z DEFINES A ZONE WHERE ALL
BODY AND LEAD IRREGULARITIES ARE
ALLOWED.

DIM MIN MAX MIN MAX

A 0.570 0.620 14.48 15.75
B 0.380 0.405 9.66 10.28
C 0.160 0.190 4.07 4.82
D 0.025 0.035 0.64 0.88
F 0.142 0.147 3.61 3.73
G 0.095 0.105 2.42 2.66
H 0.110 0.155 2.80 3.93
J 0.018 0.025 0.46 0.64
K 0.500 0.562 12.70 14.27
L 0.045 0.060 1.15 1.52
N 0.190 0.210 4.83 5.33
Q 0.100 0.120 2.54 3.04
R 0.080 0.110 2.04 2.79
S 0.045 0.055 1.15 1.39
T 0.235 0.255 5.97 6.47
U 0.000 0.050 0.00 1.27
V 0.045 ––– 1.15 –––
Z ––– 0.080 ––– 2.04

MILLIMETERSINCHES

DT SUFFIX

PLASTIC PACKAGE

CASE 369A–13

(DPAK)

ISSUE Y

NOTES:

SEATING

–T–

PLANE

B

V

S

R

4

A

123

K

F

L

D

2 PL

G

0.13 (0.005) T

C

E

Z

U

J

H

M

1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.

2. CONTROLLING DIMENSION: INCH.

DIM MIN MAX MIN MAX

A 0.235 0.250 5.97 6.35
B 0.250 0.265 6.35 6.73
C 0.086 0.094 2.19 2.38
D 0.027 0.035 0.69 0.88
E 0.033 0.040 0.84 1.01
F 0.037 0.047 0.94 1.19
G 0.180 BSC 4.58 BSC
H 0.034 0.040 0.87 1.01
J 0.018 0.023 0.46 0.58
K 0.102 0.114 2.60 2.89
L 0.090 BSC 2.29 BSC
R 0.175 0.215 4.45 5.46
S 0.020 0.050 0.51 1.27
U 0.020 ––– 0.51 –––
V 0.030 0.050 0.77 1.27
Z 0.138 ––– 3.51 –––

MILLIMETERSINCHES

10

MOTOROLA ANALOG IC DEVICE DATA

MC78M00 MC78M00A Series

OUTLINE DIMENSIONS

DT–1 SUFFIX

PLASTIC PACKAGE

CASE 369–07

(DPAK)

ISSUE L

V

–T–

SEATING
PLANE

S

F

B
R

4

123

G

A

K

3 PL

D

0.13 (0.005) T

C

E

J

H

M

NOTES:

1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.

2. CONTROLLING DIMENSION: INCH.

DIM MIN MAX MIN MAX

A 0.235 0.250 5.97 6.35
B 0.250 0.265 6.35 6.73
C 0.086 0.094 2.19 2.38
D 0.027 0.035 0.69 0.88
E 0.033 0.040 0.84 1.01
F 0.037 0.047 0.94 1.19

0.090 BSC 2.29 BSC

G
H 0.034 0.040 0.87 1.01
J 0.018 0.023 0.46 0.58
K 0.350 0.380 8.89 9.65
R 0.175 0.215 4.45 5.46
S 0.050 0.090 1.27 2.28
V 0.030 0.050 0.77 1.27

MILLIMETERSINCHES

MOTOROLA ANALOG IC DEVICE DATA

11

MC78M00 MC78M00A Series

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the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. “T ypical” parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”
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MOTOROLA ANALOG IC DEVICE DATA

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MC78M00/D