Datasheet MC 78M12 CDTG Datasheet

Page 1

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.

• 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

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MARKING

DIAGRAMS

TO–220

T SUFFIX

CASE 221A

Heatsink surface

connected to Pin 2.

DPAK DT SUFFIX CASE 369A

78MxxZT

ALYWW

8MxxZ

ALYWW

1.0 k 1.0 k

300

3.6 k

6.4 k

520

6.0 k

2.6 k

2.0 k 3.9 k

6.0 k

This device contains 28 active transistors.

5.6 k

2.8 k

3.0 k

40 pF

1.0 k

210

6.7 16 k

100

200

300

10 pF

20050

Figure 1. Representative Schematic Diagram

Input

0.24

Output

Heatsink surface (shown as terminal 4 in

case outline drawing) is connected to Pin 2.

Pin 1. Input

2. Ground

3. Output

xx = Voltage Option Z = A, B, or C Option A = Assembly Location L = Wafer Lot Y = Year WW = Work Week

ORDERING INFORMATION

See detailed ordering and shipping information in the package dimensions section on page 10 of this data sheet.

Gnd

 Semiconductor Components Industries, LLC, 2002

January , 2002 – Rev. 9

1 Publication Order Number:

MC78M00/D

Page 2

MC78M00, MC78M00A Series

MAXIMUM RATINGS (T

Input Voltage (5.0 V–18 V) V

= 25°C, unless otherwise noted.) (Note 1)

Rating

Symbol Value Unit

35 Vdc

(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

JA JC

Internally Limited

70 °C/W

5.0 °C/W

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

JA JC

stg

Internally Limited

92 °C/W

5.0 °C/W

+150 °C

–65 to +150 °C

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 (V

= 10 V, IO = 350 mA, TJ = T

low

to T

, PD ≤ 5.0 W,

high

unless otherwise noted.) (Note 2)

Characteristics

Output Voltage (TJ = 25°C) V

Symbol Min Typ Max Unit

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

line

– 3.0 50 mV

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

Load Regulation Reg

load

(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) I Quiescent Current Change ∆I

– 3.2 6.0 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) V

– 40 – µV

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

– 2.0 – Vdc

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

– 50 – mA

Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.2 – mV/°C

(IO = 5.0 mA) Peak Output Current I

– 700 – mA

(TJ = 25°C)

2. T

=0°C for MC78MxxAC, C T

low

= –40°C for MC78MxxAB, B

= +125°C for MC78MxxAB, AC, B, C

high

Vdc

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Page 3

MC78M00, MC78M00A Series

MC78M06C ELECTRICAL CHARACTERISTICS (V

Characteristics

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

= 11 V, IO = 350 mA, 0°C < TJ < 125°C, PD ≤ 5.0 W, unless otherwise noted.)

Symbol Min Typ Max Unit

O O

5.75 6.0 6.25 Vdc

5.7 – 6.3 Vdc

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

line

– 5.0 50 mV

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

load

(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

– 3.2 6.0 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) V

– 45 – µV

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

– 2.0 – Vdc

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

– 50 – mA

Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.2 – mV/°C

(IO = 5.0 mA) Peak Output Current I

– 700 – mA

(TJ = 25°C)

MC78M08C/AC/B/AB ELECTRICAL CHARACTERISTICS (V

= 14 V, IO = 350 mA, TJ = T

low

to T

, PD ≤ 5.0 W,

high

unless otherwise noted.) (Note 3)

Characteristics

Output Voltage (TJ = 25°C) V

Symbol Min Typ Max Unit

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

line

– 6.0 50 mV

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

load

(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

– 3.2 6.0 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) V

– 52 – µV

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

– 2.0 – Vdc

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

– 50 – mA

Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.2 – mV/°C

(IO = 5.0 mA) Peak Output Current I

– 700 – mA

(TJ = 25°C)

3. T

=0°C for MC78MxxAC, C T

low

= –40°C for MC78MxxAB, B

= +125°C for MC78MxxAB, AC, B, C

high

Vdc

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Page 4

MC78M00, MC78M00A Series

MC78M09C/B ELECTRICAL CHARACTERISTICS (V

= 15 V, IO = 350 mA, TJ = T

low

to T

, PD ≤ 5.0 W, unless otherwise noted.)

high

(Note 4)

Characteristics

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

Symbol Min Typ Max Unit

O O

8.64 9.0 9.45 Vdc

8.55 – 9.45 Vdc

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

line

– 6.0 50 mV

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

load

(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

– 3.2 6.0 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) V

– 52 – µV

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

– 2.0 – Vdc

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

– 50 – mA

Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.2 – mV/°C

(IO = 5.0 mA) Peak Output Current I

– 700 – mA

(TJ = 25°C)

MC78M12C/AC/B/AB ELECTRICAL CHARACTERISTICS (V

= 19 V, IO = 350 mA, TJ = T

low

to T

, PD ≤ 5.0 W,

high

unless otherwise noted.) (Note 4)

Characteristics

Output Voltage (TJ = 25°C) V

Symbol Min Typ Max Unit

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

line

– 8.0 50 mV

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

load

(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

– 3.2 6.0 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) V

– 75 – µV

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

– 2.0 – Vdc

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

– 50 – mA

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

(IO = 5.0 mA) Peak Output Current I

– 700 – mA

(TJ = 25°C)

4. T

=0°C for MC78MxxAC, C T

low

= –40°C for MC78MxxAB, B

= +125°C for MC78MxxAB, AC, B, C

high

Vdc

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Page 5

MC78M00, MC78M00A Series

MC78M15C/AC/B/AB ELECTRICAL CHARACTERISTICS (V

= 23 V, IO = 350 mA, TJ = T

low

to T

, PD ≤ 5.0 W,

high

unless otherwise noted.) (Note 5)

Characteristics

Output Voltage (TJ = 25°C) V

Symbol Min Typ Max Unit

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

line

– 10 50 mV

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

load

(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

– 3.2 6.0 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) V

– 90 – µV

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

– 2.0 – Vdc

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

– 50 – mA

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

(IO = 5.0 mA) Peak Output Current I

– 700 – mA

(TJ = 25°C)

Vdc

MC78M18C ELECTRICAL CHARACTERISTICS (V

Characteristics

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

= 27 V, IO = 350 mA, 0°C < TJ < 125°C, PD ≤ 5.0 W, unless otherwise noted.)

Symbol Min Typ Max Unit

O O

17.3 18 18.7 Vdc

17.1 – 18.9 Vdc

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

line

– 10 50 mV

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

load

(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

– 3.2 6.5 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) V

– 100 – µV

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

– 2.0 – Vdc

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

– 50 – mA

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

(IO = 5.0 mA) Peak Output Current I

– 700 – mA

(TJ = 25°C)

5. T

=0°C for MC78MxxAC, C T

low

= –40°C for MC78MxxAB, B

= +125°C for MC78MxxAB, AC, B, C

high

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Page 6

MC78M00, MC78M00A Series

MC78M20C ELECTRICAL CHARACTERISTICS (V

Characteristics

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

= 29 V, IO = 350 mA, 0°C < TJ < 125°C, PD ≤ 5.0 W, unless otherwise noted.)

Symbol Min Typ Max Unit

O O

19.2 20 20.8 Vdc 19 – 21 Vdc

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

Line Regulation Reg

line

– 10 50 mV

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

Load Regulation Reg

load

(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

– 3.2 6.5 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) V

– 110 – µV

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

– 2.0 – Vdc

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

– 50 – mA

Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.5 – mV/°C

(IO = 5.0 mA) Peak Output Current I

– 700 – mA

(TJ = 25°C)

MC78M24C ELECTRICAL CHARACTERISTICS (V

= 33 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) V Output Voltage Variation V

O O

23 24 25 Vdc

22.8 – 25.2 Vdc

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

line

– 10 50 mV

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

load

(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

– 3.2 7.0 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) V

– 170 – µV

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

– 2.0 – Vdc

(TJ = 25°C) Short Circuit Current Limit (TJ = 25°C) I

– 50 – mA

Average Temperature Coefficient of Output Voltage ∆VO/∆T – ±0.5 – mV/°C

(IO = 5.0 mA) Peak Output Current I

– 700 – mA

(TJ = 25°C)

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Page 7

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.

100

Free Air Mounted Vertically

Minimum Size Pad

0 10203025155.0

L, LENGTH OF COPPER (mm)

JAθ

R , THERMAL RESISTANCE

JUNCTION-TO-AIR ( C/W)°

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.

D(max)

for T

= 50°C

2.0 oz. Copper L

2.4

2.0

1.6

1.2

0.8

0.4

, MAXIMUM POWER DISSIPATION (W)

Figure 2. DPAK Thermal Resistance and Maximum

Power Dissipation versus P.C.B. Copper Length

= 10°C/W

5.0

D(max)

= 20°C/W

= 7.52 W

, AMBIENT TEMPERATURE (°C)

3.0

2.0

1.0

0.5

, POWER DISSIPATION (W)

0.3

0.2

θJC = 5°C/W P

0.1 25 50 75 100 125 150

No Heat Sink

Infinite Heat Sink

Figure 3. Worst Case Power Dissipation

versus Ambient Temperature (TO–220)

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Page 8

MC78M00, MC78M00A Series

1.0

0.9

0.8

= 25°C

0.7

0.6

0.5

, OUTPUT CURRENT (A)

0.4

0.3

0.2

= 125°C

0.1

0 5.0 10 15 20 25 30 35 40

- VO, DROPOUT VOLTAGE (V)

Figure 4. Peak Output Current versus

Dropout Voltage

100

= 500 mA

out

2.5

2.0

1.5

1.0

, DROPOUT VOLTAGE (V)

-VV

0.5

∆V

= 100 mV

0 25 50 75 100 125 150

, JUNCTION TEMPERATURE (°C)

Figure 5. Dropout Voltage versus

Junction Temperature

100

IO = 500 mA

IO = 100 mA

IO = 10 mA

= 500 mA

RR, RIPPLE REJECTION (dB)

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

out

= 5.0 V

out

Vin = 10 V CO = 0 T

= 25°C

f, FREQUENCY (Hz)

= 5.0 V

out

Vin = 10 V CO = 0 f = 120 Hz T

RR, RIPPLE REJECTION (dB)

0.01 0.1 0.5 1.0 10

= 25°C

IO, OUTPUT CURRENT (A)

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

4.0 T

= 25°C

3.0

= 125°C

2.0

= 25°C

, BIAS CURRENT (mA)

1.0

0 5.0 10 15 20 25 30 35 40

= 125°C

VO = 5.0 V IO = 0.5 A

VI, INPUT VOLTAGE (Vdc)

5.0

4.0

= 25°C

3.0

2.0

, BIAS CURRENT (mA)

1.0

0.01 0.1 0.5 1.0 10

= 125°C

VI-VO = 5.0 V

IO, OUTPUT CURRENT (A)

Figure 8. Bias Current versus Input Voltage

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Figure 9. Bias Current versus Output Current

Page 9

MC78M00, MC78M00A Series

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 T ransistor 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

Input

0.33 µF

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

Constant Current to Grounded

Load

+ I

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 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 Vin-V

≥ 2.0 V

out

Output

0.1 µF

10 k

Input

0.33 µF

MC78M05C

1.0 k



MC1741

IIB = 1.5 mA over line and load changes.

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

5.0Ω, 10 W resistor and the output voltage compliance would be the input voltage less 7.0 V.

Figure 10. Current Regulator

MJ2955 or Equiv.

Input

1.0 µF

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 V transistor begins conducting; this circuit is not short circuit proof. Input-output differential voltage minimum is increased by VBE of the pass transistor.

MC78MXXC

of the PNP determines when the pass

1.0 µF

Output

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 11. Adjustable Output Regulator

MJ2955 or Equiv.

Input

The circuit of Figure 12 can be modified to provide supply protection against short circuits by adding a short circuit sense resistor, R 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.

2N6049 or Equiv.

1.0 µF

XX = 2 digits of type number indicating voltage.

MC78MXXC

Output

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

Short Circuit Protection

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Page 10

MC78M00, MC78M00A Series

ORDERING INFORMATION

Shipping

Rails

Device Output Voltage Temperature Range Package

MC78M05CDT/RK MC78M05ACDT/RK MC78M05CT MC78M05ACT MC78M05ABDT/RK MC78M05ABT MC78M05BDT/RK MC78M05BT TO–220 50 Units/Rail – MC78M06CDT/RK MC78M06CT MC78M06BT MC78M08CDT/RK MC78M08ACDT/RK MC78M08CT MC78M08ACT MC78M08ABDT/RK MC78M08ABT MC78M08BDT/RK MC78M08BT TO–220 50 Units/Rail – MC78M09CDT/RK MC78M09CT MC78M09BDT/RK MC78M09BT MC78M12CDT/RK MC78M12ACDT/RK MC78M12CT MC78M12ACT MC78M12ABDT/RK MC78M12ABT MC78M12BDT/RK MC78M12BT TO–220 50 Units/Rail – MC78M15CDT/RK MC78M15ACDT/RK MC78M15CT MC78M15ACT MC78M15ABDT/RK MC78M15ABT MC78M15BDT/RK MC78M15BT TO–220 50 Units/Rail MC78M18CDT MC78M18CT MC78M18BT MC78M20CT MC78M20BT MC78M24CT MC78M24BT

5.0 V

6.0 V

8.0 V

9.0 V

12 V

15 V

18 V

20 V

24 V

TJ = 0° to +125°C

TJ = –40° to +125°C

TJ = 0° to +125°C

TJ = –40° to +125°C

TJ = 0° to +125°C

TJ = –40° to +125°C

TJ = 0° to +125°C

TJ = –40° to +125°C

TJ = 0° to +125°C

TJ = –40° to +125°C

TJ = 0° to +125°C

TJ = –40° to +125°C

TJ = 0° to +125°C

TJ = –40° to +125°C

TJ = 0° to +125°C

TJ = –40° to +125°C

TJ = 0° to +125°C

TJ = –40° to +125°C