MC78M15ACDTG/RKG - ON Semiconductor L.L.C.

June, 2004 − Rev. 14

393 Publication Order Number:

MC78M00/D

MC78M00, MC78M00A

Series

500 mA Positive Voltage

Regulators

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.

Features

•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

•Pb−Free Packages are Available

Figure 1. Representative Schematic Diagram

This device contains 28 active transistors.

1.0 k 1.0 k Input

210

6.7

V16 k 100

200

300

3.6

6.4

520

6.0 k

2.0 k 3.9 k

6.0

k2.8 k

5.6 k

3.0 k

1.0 k

300

20050

0.24

GND

Output

10 pF

2.6 k

TO−220−3

T SUFFIX

CASE 221A

DPAK−3

DT SUFFIX

CASE 369C

MARKING

DIAGRAMS

xxxxx = Device Type and Voltage Option Code

A = Assembly Location

L = Wafer Lot

Y = Year

WW = Work Week

See detailed ordering and shipping information in the package

dimensions section on page 402 of this data sheet.

ORDERING INFORMATION

Heatsink surface

connected to Pin 2.

Pin 1. Input

2. Ground

3. Output

Heatsink surface (shown as terminal 4 in

case outline drawing) is connected to Pin 2.

AWLYWW

78MxxXXT

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4xxxxx

ALYWW

xx = Voltage Option

XX = Appropriate Suffix Options

A = Assembly Location

WL = Wafer Lot

Y = Year

WW = Work Week

See general marking information in the device marking

section on page 402 of this data sheet.

DEVICE MARKING INFORMATION

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MAXIMUM RATINGS (TA = 25°C, unless otherwise noted) (Note 1)

Rating Symbol Value Unit

Input Voltage (5.0 V−18 V) VI35 Vdc

(20 V−24V) 40

Power Dissipation (Package Limitation)

Plastic Package, T Suffix

TA = 25°C PDInternally Limited

Thermal Resistance, Junction−to−Air JA 70 °C/W

Thermal Resistance, Junction−to−Case JC 5.0 °C/W

Plastic Package, DT Suffix

TA = 25°C PDInternally Limited

Thermal Resistance, Junction−to−Air JA 92 °C/W

Thermal Resistance, Junction−to−Case JC 5.0 °C/W

Operating Junction Temperature Range TJ+150 °C

Storage Temperature Range Tstg −65 to +150 °C

Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit

values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,

damage may occur and reliability may be affected.

1. This device series contains ESD protection and exceeds the following tests:

Human Body Model 2000 V per MIL−STD−883, Method 3015.

Machine Model Method 200 V.

MC78M05C/AC/B/AB ELECTRICAL CHARACTERISTICS (VI = 10 V, IO = 350 mA, TJ = Tlow to Thigh, PD ≤ 5.0 W,

unless otherwise noted) (Note 2)

Characteristics Symbol Min Typ Max Unit

Output Voltage (TJ = 25°C) VOVdc

MC78M05C 4.8 5.0 5.2

MC78M05AC 4.9 5.0 5.1

Output Voltage Variation VOVdc

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

MC78M05C 4.75 −5.25

MC78M05AC 4.80 −5.20

Line Regulation Regline −3.0 50 mV

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

Load Regulation Regload mV

(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) −20 100

(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) −10 50

Input Bias Current (TJ = 25°C) IIB −3.2 6.0 mA

Quiescent Current Change IIB mA

(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) Vn−40 −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−VO−2.0 −Vdc

(TJ = 25°C)

Short Circuit Current Limit (TJ = 25°C, VI = 35 V) IOS −50 −mA

Average Temperature Coefficient of Output Voltage VO/T−±0.2 −mV/°C

(IO = 5.0 mA)

Peak Output Current IO−700 −mA

(TJ = 25°C)

2. Tlow =0°C for MC78MxxAC, C Thigh = +125°C for MC78MxxAB, AC, B, C

=−40°C for MC78MxxAB, B

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MC78M06C ELECTRICAL CHARACTERISTICS (VI = 11 V, IO = 350 mA, 0°C < TJ < 125°C, PD ≤ 5.0 W, unless otherwise noted)

Characteristics Symbol Min Typ Max Unit

Output Voltage (TJ = 25°C) VO5.75 6.0 6.25 Vdc

Output Voltage Variation VO5.7 −6.3 Vdc

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

Line Regulation Regline −5.0 50 mV

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

Load Regulation Regload mV

(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) IIB −3.2 6.0 mA

Quiescent Current Change IIB mA

(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) Vn−45 −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 − VO−2.0 −Vdc

(TJ = 25°C)

Short Circuit Current Limit (TJ = 25°C, VI = 35 V) IOS −50 −mA

Average Temperature Coefficient of Output Voltage VO/T−±0.2 −mV/°C

(IO = 5.0 mA)

Peak Output Current IO−700 −mA

(TJ = 25°C)

MC78M08C/AC/B/AB ELECTRICAL CHARACTERISTICS (VI = 14 V, IO = 350 mA, TJ = Tlow to Thigh, PD ≤ 5.0 W,

unless otherwise noted) (Note 3)

Characteristics Symbol Min Typ Max Unit

Output Voltage (TJ = 25°C) VOVdc

MC78M08C 7.70 8.0 8.30

MC78M08AC 7.84 8.0 8.16

Output Voltage Variation VOVdc

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

MC78M08C 7.6 −8.4

MC78M08AC 7.7 −8.3

Line Regulation Regline −6.0 50 mV

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

Load Regulation Regload mV

(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) IIB −3.2 6.0 mA

Quiescent Current Change IIB mA

(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) Vn−52 −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−VO−2.0 −Vdc

(TJ = 25°C)

Short Circuit Current Limit (TJ = 25°C, VI = 35 V) IOS −50 −mA

Average Temperature Coefficient of Output Voltage VO/T−±0.2 −mV/°C

(IO = 5.0 mA)

Peak Output Current IO−700 −mA

(TJ = 25°C)

3. Tlow =0°C for MC78MxxAC, C Thigh = +125°C for MC78MxxAB, AC, B, C

=−40°C for MC78MxxAB, B

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MC78M09C/B ELECTRICAL CHARACTERISTICS (VI = 15 V, IO = 350 mA, TJ = Tlow to Thigh, PD ≤ 5.0 W, unless otherwise

noted) (Note 4)

Characteristics Symbol Min Typ Max Unit

Output Voltage (TJ = 25°C) VO8.64 9.0 9.45 Vdc

Output Voltage Variation VO8.55 −9.45 Vdc

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

Line Regulation Regline −6.0 50 mV

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

Load Regulation Regload mV

(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) IIB −3.2 6.0 mA

Quiescent Current Change IIB mA

(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) Vn−52 −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−VO−2.0 −Vdc

(TJ = 25°C)

Short Circuit Current Limit (TJ = 25°C, VI = 35 V) IOS −50 −mA

Average Temperature Coefficient of Output Voltage VO/T−±0.2 −mV/°C

(IO = 5.0 mA)

Peak Output Current IO−700 −mA

(TJ = 25°C)

MC78M12C/AC/B/AB ELECTRICAL CHARACTERISTICS (VI = 19 V, IO = 350 mA, TJ = Tlow to Thigh, PD ≤ 5.0 W,

unless otherwise noted) (Note 4)

Characteristics Symbol Min Typ Max Unit

Output Voltage (TJ = 25°C) VOVdc

MC78M12C 11.50 12 12.50

MC78M12AC 11.76 12 12.24

Output Voltage Variation VOVdc

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

MC78M12C 11.4 −12.6

MC78M12AC 11.5 −12.5

Line Regulation Regline −8.0 50 mV

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

Load Regulation Regload mV

(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) IIB −3.2 6.0 mA

Quiescent Current Change IIB mA

(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) Vn−75 −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−VO−2.0 −Vdc

(TJ = 25°C)

Short Circuit Current Limit (TJ = 25°C, VI = 35 V) IOS −50 −mA

Average Temperature Coefficient of Output Voltage VO/T−±0.3 −mV/°C

(IO = 5.0 mA)

Peak Output Current IO−700 −mA

(TJ = 25°C)

4. Tlow =0°C for MC78MxxAC, C Thigh = +125°C for MC78MxxAB, AC, B, C

=−40°C for MC78MxxAB, B

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MC78M15C/AC/B/AB ELECTRICAL CHARACTERISTICS (VI = 23 V, IO = 350 mA, TJ = Tlow to Thigh, PD ≤ 5.0 W,

unless otherwise noted) (Note 5)

Characteristics Symbol Min Typ Max Unit

Output Voltage (TJ = 25°C) VOVdc

MC78M15C 14.4 15 15.6

MC78M15AC 14.7 15 15.3

Output Voltage Variation VOVdc

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

MC78M15C 14.25 −15.75

MC78M15AC 14.40 −15.60

Input Regulation Regline −10 50 mV

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

Load Regulation Regload mV

(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) IIB −3.2 6.0 mA

Quiescent Current Change IIB mA

(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) Vn−90 −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−VO−2.0 −Vdc

(TJ = 25°C)

Short Circuit Current Limit (TJ = 25°C, VI = 35 V) IOS −50 −mA

Average Temperature Coefficient of Output Voltage VO/T−±0.3 −mV/°C

(IO = 5.0 mA)

Peak Output Current IO−700 −mA

(TJ = 25°C)

MC78M18C/B ELECTRICAL CHARACTERISTICS (VI = 27 V, IO = 350 mA, TJ = Tlow to Thigh, PD ≤ 5.0 W,

unless otherwise noted) (Note 5)

Characteristics Symbol Min Typ Max Unit

Output Voltage (TJ = 25°C) VO17.3 18 18.7 Vdc

Output Voltage Variation VO17.1 −18.9 Vdc

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

Line Regulation Regline −10 50 mV

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

Load Regulation Regload mV

(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) IIB −3.2 6.5 mA

Quiescent Current Change IIB mA

(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) Vn−100 −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−VO−2.0 −Vdc

(TJ = 25°C)

Short Circuit Current Limit (TJ = 25°C, VI = 35 V) IOS −50 −mA

Average Temperature Coefficient of Output Voltage VO/T−±0.3 −mV/°C

(IO = 5.0 mA)

Peak Output Current IO−700 −mA

(TJ = 25°C)

5. Tlow =0°C for MC78MxxAC, C Thigh = +125°C for MC78MxxAB, AC, B, C

=−40°C for MC78MxxAB, B

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MC78M20C/B ELECTRICAL CHARACTERISTICS (VI = 29 V, IO = 350 mA, TJ = Tlow to Thigh, PD ≤ 5.0 W,

unless otherwise noted) (Note 6)

Characteristics Symbol Min Typ Max Unit

Output Voltage (TJ = 25°C) VO19.2 20 20.8 Vdc

Output Voltage Variation VO19 −21 Vdc

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

Line Regulation Regline −10 50 mV

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

Load Regulation Regload mV

(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) IIB −3.2 6.5 mA

Quiescent Current Change IIB mA

(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) Vn−110 −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−VO−2.0 −Vdc

(TJ = 25°C)

Short Circuit Current Limit (TJ = 25°C, VI = 35 V) IOS −50 −mA

Average Temperature Coefficient of Output Voltage VO/T−±0.5 −mV/°C

(IO = 5.0 mA)

Peak Output Current IO−700 −mA

(TJ = 25°C)

MC78M24C/B ELECTRICAL CHARACTERISTICS (VI = 33 V, IO = 350 mA, TJ = Tlow to Thigh, PD ≤ 5.0 W,

unless otherwise noted) (Note 6)

Characteristics Symbol Min Typ Max Unit

Output Voltage (TJ = 25°C) VO23 24 25 Vdc

Output Voltage Variation VO22.8 −25.2 Vdc

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

Line Regulation Regline −10 50 mV

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

Load Regulation Regload mV

(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) IIB −3.2 7.0 mA

Quiescent Current Change IIB mA

(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) Vn−170 −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−VO−2.0 −Vdc

(TJ = 25°C)

Short Circuit Current Limit (TJ = 25°C) IOS −50 −mA

Average Temperature Coefficient of Output Voltage VO/T−±0.5 −mV/°C

(IO = 5.0 mA)

Peak Output Current IO−700 −mA

(TJ = 25°C)

6. Tlow =0°C for MC78MxxAC, C Thigh = +125°C for MC78MxxAB, AC, B, C

=−40°C for MC78MxxAB, B

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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.

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.

Figure 2. DPAK Thermal Resistance and Maximum

Power Dissipation versus P.C.B. Copper Length

Figure 3. Worst Case Power Dissipation

versus Ambient Temperature (TO−220)

, POWER DISSIPATION (W)

JC = 5°C/W

PD(max) = 7.52 W

No Heat Sink

HS = 20°C/W

HS = 10°C/W Infinite Heat

Sink

R , THERMAL RESISTANCE

JAθ

JUNCTION−TO−AIR ( C/W)°

L, LENGTH OF COPPER (mm)

PD, MAXIMUM POWER DISSIPATION (W)

RJA

5.0

3.0

2.0

1.0

0.5

0.3

0.2

0.1

100

TA, AMBIENT TEMPERATURE (°C)

25 50 75 100 125 150

010203025155.0

Free Air

Mounted

Vertically 2.0 oz. Copper

PD(max) for TA = 50°C

ÎÎÎÎ

0.4

0.8

1.2

1.6

2.0

2.4

Minimum

Size Pad

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TJ = 25°C

Figure 4. Peak Output Current versus

Dropout Voltage

Figure 5. Dropout Voltage versus

Junction Temperature

Figure 6. Ripple Rejection versus Frequency Figure 7. Ripple Rejection versus Output Current

Figure 8. Bias Current versus Input Voltage

100

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

f, FREQUENCY (Hz)

RR, RIPPLE REJECTION (dB)

Iout = 500 mA

, DROPOUT VOLTAGE (V)

TJ, JUNCTION TEMPERATURE (°C)

2.5

2.0

1.5

1.0

0.5

00 25 50 75 100 125 150

−VV

VO = 100 mV

IO = 500 mA

IO = 100 mA

IO = 10 mA

RR, RIPPLE REJECTION (dB)

IO, OUTPUT CURRENT (A)

100

0.01 0.1 0.5 1.0 10

Vout = 5.0 V

Vin = 10 V

CO = 0

f = 120 Hz

TJ = 25°C

, BIAS CURRENT (mA)

VI, INPUT VOLTAGE (Vdc)

4.0

3.0

2.0

1.0

00 5.0 10 15 20 25 30 35 40

TJ = 25°C

TJ = 125°C

TJ = 25°C

VO = 5.0 V

IO = 0.5 A

IO, OUTPUT CURRENT (A)

5.0

4.0

3.0

2.0

1.0

0.01 0.1 0.5 1.0 10

TJ = 125°C

VI−VO = 5.0 V

Figure 9. Bias Current versus Output Current

, OUTPUT CURRENT (A)

VI − VO, DROPOUT VOLTAGE (V)

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

00 5.0 10 15 20 25 30 35 40

TJ = 125°C

TJ = 25°C

, BIAS CURRENT (mA)

Iout = 500 mA

Vout = 5.0 V

Vin = 10 V

CO = 0

TJ = 25°C

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APPLICATIONS INFORMATION

Design Considerations

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 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 F 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.

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.

Input MC78M05C

Output

0.33 F

10 k

MC1741

1.0 k

0.1 F

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.

XX = 2 digits of type number indicating voltage.

MC78MXXC

Input

Output

1.0 F

MJ2955 or Equiv.

1.0 F

The circuit of Figure 12 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.

XX = 2 digits of type number indicating voltage.

1.0 F

MC78MXXC

MJ2955

or Equiv.

Input

Output

RSC

2N6049

or Equiv.

VO, 7.0 V to 20 V

Vin−Vout ≥ 2.0 V

Figure 10. Current Regulator

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:

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

5.0, 10 W resistor and the output voltage compliance would

be the input voltage less 7.0 V.

IO = 5.0 V

R+ IIB

IIB = 1.5 mA over line and load changes.

Input

0.33 FR

MC78M05C

Constant

Current to

Grounded

Load

Figure 11. Adjustable Output Regulator

Figure 12. Current Boost Regulator Figure 13. Current Boost with

Short Circuit Protection

MC78M00, MC78M00A Series

http://onsemi.com

402

ORDERING INFORMATION

Shipping†

Device

Output

Voltage Temperature Range Package Marking

Rails

(No Suffix)

Tape & Reel

(RK Suffix)

MC78M05CDT/RK DPAK−378M05 75 Units/Rail 2500 Units/Reel

MC78M05CDTG/RKG

T 0° t 125°C

DPAK−3

(Pb−Free)

MC78M05ACDT/RK TJ = 0° to +125°CDPAK−3 8M05D 75 Units/Rail 2500 Units/Reel

MC78M05CT TO−220−378M05CT 50 Units/Rail −

MC78M05ACT

50 V

78M05ACT

MC78M05ABDT/RK 5.0 V DPAK−38M05A 75 Units/Rail 2500 Units/Reel

MC78M05ABDTG

T 40° t 125°C

DPAK−3

(Pb−Free)

MC78M05ABT TJ = −40° to +125°CTO−220−3 78M05ABT 50 Units/Rail −

MC78M05BDT/RK DPAK−3 8M05B 75 Units/Rail 2500 Units/Reel

MC78M05BT TO−220−3 78M05BT 50 Units/Rail −

MC78M06CDT/RK DPAK−3 78M06 75 Units/Rail 2500 Units/Reel

MC78M06CDTG

6.0 V TJ = 0° to +125°CDPAK−3

(Pb−Free)

78M06 75 Units/Rail 2500 Units/Reel

MC78M06CT

0 V

TO−220−378M06CT 50 Units/Rail −

MC78M06BT TJ = −40° to +125°C78M06BT

MC78M08CDT/RK DPAK−378M08 75 Units/Rail 2500 Units/Reel

MC78M08CDT/RKG DPAK−3

(Pb−Free)

MC78M08ACDT/RK

T 0

to +125

DPAK−3 8M08D 75 Units/Rail 2500 Units/Reel

MC78M08CT TJ = 0° to +125°CTO−220−3 78M08CT 50 Units/Rail −

MC78M08CTG

80 V

TO−220−3

(Pb−Free)

78M08CT 50 Units/Rail −

MC78M08ACT 8.0 V TO−220−3 78M08ACT 50 Units/Rail −

MC78M08ABDT/RK DPAK−3 8M08A 75 Units/Rail 2500 Units/Reel

MC78M08ABT TO−220−3 78M08ABT 50 Units/Rail −

MC78M08BDT/RK

TJ =

−

to +125

DPAK−3 8M08B 75 Units/Rail 2500 Units/Reel

MC78M08BDTG/RKG

−

40° t

125°C

DPAK−3

(Pb−Free)

8M08B 75 Units/Rail 2500 Units/Reel

MC78M08BT TO−220−3 78M08BT 50 Units/Rail −

MC78M09CDT/RK DPAK−378M09 75 Units/Rail 2500 Units/Reel

MC78M09CDTG/RKG

T 0

to +125

DPAK−3

(Pb−Free)

MC78M09CT

90 V

TJ = 0° to +125°CTO−220−3 78M09CT 50 Units/Rail −

MC78M09CTG 9.0 V TO−220−3

(Pb−Free)

78M09CT 50 Units/Rail −

MC78M09BDT/RK

T 40

to +125

DPAK−3 8M09B 75 Units/Rail 2500 Units/Reel

MC78M09BT TJ = −40° to +125°CTO−220−3 78M09BT 50 Units/Rail −

MC78M12CDT/RK DPAK−3 78M12 75 Units/Rail 2500 Units/Reel

MC78M12CDTG/RKG DPAK−3

(Pb−Free)

78M12 75 Units/Rail 2500 Units/Reel

MC78M12ACDT/RK 12 V TJ = 0° to +125°CDPAK−3 8M12D 75 Units/Rail 2500 Units/Reel

MC78M12CT

TO−220−3 78M12CT 50 Units/Rail −

MC78M12CTG TO−220−3

(Pb−Free)

78M12CT 50 Units/Rail −

†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging

Specifications Brochure, BRD8011/D.

MC78M00, MC78M00A Series

http://onsemi.com

403

ORDERING INFORMATION

Shipping†

Device

Output

Voltage Temperature Range Package Marking

Rails

(No Suffix)

Tape & Reel

(RK Suffix)

MC78M12ACT TJ = 0° to +125°CTO−220−3 78M12ACT 50 Units/Rail −

MC78M12ABDT/RK DPAK−3 8M12A 75 Units/Rail 2500 Units/Reel

MC78M12ABT TO−220−3 78M12ABT 50 Units/Rail −

MC78M12BDT/RK 12 V TJ = −40° to +125°CDPAK−3 8M12B 75 Units/Rail 2500 Units/Reel

MC78M12BDTG/RKG DPAK−3

(Pb−Free)

8M12B 75 Units/Rail 2500 Units/Reel

MC78M12BT TJ = 0° to +125°CTO−220−3 78M12BT 50 Units/Rail −

MC78M15CDT/RK 15 V TJ = 0° to +125°C DPAK−378M15 75 Units/Rail 2500 Units/Reel

MC78M15ACDT/RK

8M15D

MC78M15ACDTG/RKG 15 V TJ = 0° to +125°C DPAK−3

(Pb−Free)

8M15D 75 Units/Rail 2500 Units/Reel

MC78M15CT 15 V TJ = 0° to +125°CTO−220−3 78M15CT 50 Units/Rail −

MC78M15CTG 15 V TJ = 0° to +125°CTO−220−3

(Pb−Free)

78M15CT 50 Units/Rail −

MC78M15ACT 15 V TJ = 0° to +125°CTO−220−3 78M15ACT 50 Units/Rail −

MC78M15ACTG 15 V TJ = 0° to +125°CTO−220−3

(Pb−Free)

78M15ACT 50 Units/Rail −

MC78M15ABDT/RK 15 V TJ = −40° to +125°CDPAK−3 8M15A 75 Units/Rail 2500 Units/Reel

MC78M15ABT

TO−220−3 78M15ABT 50 Units/Rail −

MC78M15BDT/RK DPAK−3 8M15B 75 Units/Rail 2500 Units/Reel

MC78M15BT TO−220−3 78M15BT 50 Units/Rail −

MC78M18CDT/RK 18 V TJ = 0° to +125°CDPAK−3 78M18 75 Units/Rail 2500 Units/Reel

MC78M18CT

TO−220−378M18CT 50 Units/Rail −

MC78M18BT TJ = −40° to +125°C 78M18BT

MC78M20CT 20 V TJ = 0° to +125°C 78M20CT

MC78M20BT TJ = −40° to +125°C 78M20BT

MC78M24CT 24 V TJ = 0° to +125°C 78M24CT

MC78M24BT TJ = −40° to +125°C 78M24BT

†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging

Specifications Brochure, BRD8011/D.