Datasheet MCT7824BT, MCT7824CD2T, MCT7824CT, MCT7818CD2T, MCT7818CT Datasheet (Motorola)

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Page 1

Order this document by MCT7800/D





THREE-TERMINAL

POSITIVE FIXED

VOLTAGE REGULATORS

Pin 1. Input

2. Ground

3. Output

STANDARD APPLICATION

A common ground is required between the input and the output voltages. The input voltage must remain typically 2.0 V above the output voltage even during the low point on the input ripple voltage.

XX, these two digits of the type number indicate

nominal voltage.

** Cin is required if regulator is located an

appreciable distance from power supply filter.

** Some CO is recommended for stability; it does

improve transient response. Values less than

0.1 µF could cause instability.

MCT78XX

Input

Cin*

0.33

CO**

Output

T SUFFIX

PLASTIC PACKAGE

CASE 221A

Heatsink surface

connected to Pin 2.

D2T SUFFIX

PLASTIC PACKAGE

CASE 936

(D2PAK)

Heatsink surface (shown as terminal 4 in

case outline drawing) is connected to Pin 2.

MCT7800

MOTOROLA

   

These voltage regulators are monolithic integrated circuits designed as fixed-voltage regulators for a wide variety of applications including local, on-card regulation. These regulators employ internal current limiting, thermal shutdown, and safe-area compensation. With adequate heatsinking they can deliver output currents in excess of 1.0 A. Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltages and currents.

• Output Current in Excess of 1.0 A

• No External Components Required

• Internal Thermal Overload Protection

• Internal Short Circuit Current Limiting

• Output Transistor Safe-Area Compensation

• Output Voltage Offered with a 4% Tolerance

• Available in Surface Mount D

PAK and Standard 3-Lead Transistor

Packages

This MCT-prefixed device is intended to be a possible replacement for the similar device with the MC-prefix. Because the MCT device originates from different source material, there may be subtle differences in typical parameter values or characteristic curves. Due to the diversity of potential applications, Motorola can not assure identical performance in all circuits. Motorola recommends that the customer qualify the MCT-prefixed device in each potential application.

DEVICE TYPE/NOMINAL OUTPUT VOLTAGE

MCT7805 MCT7806 MCT7808 MCT7809

5.0 V

6.0 V

8.0 V

9.0 V

MCT7812 MCT7815 MCT7818 MCT7824

12 V 15 V 18 V 24 V

ORDERING INFORMATION

Device

Output Voltage

Tolerance

Tested Operating

Temperature Range

Package

MCT78XXBD2T

Surface Mount

MCT78XXBT

TJ = – 40° to +125°C

Insertion Mount

MCT78XXCD2T

Surface Mount

MCT78XXCT

TJ = 0° to +125°C

Insertion Mount

XX indicates nominal voltage.

 Motorola, Inc. 1994 Rev 3

Page 2

MCT7800

MCT7800 2

MOTOROLA

MAXIMUM RATINGS

(TA = +25°C, unless otherwise noted.)

Rating

Symbol Value Unit

Input Voltage V

35 Vdc

Power Dissipation

Case 221A

TA = +25°C P

Internally Limited W

Thermal Resistance, Junction-to-Ambient θ

65 °C/W

Thermal Resistance, Junction-to-Case θ

5.0 °C/W

Case 936 (D2PAK)

TA = +25°C P

Internally Limited W

Thermal Resistance, Junction-to-Ambient θ

70 °C/W

Thermal Resistance, Junction-to-Case θ

5.0 °C/W

Storage Junction Temperature Range T

stg

– 65 to +150 °C

Operating Junction Temperature T

+150 °C

Representative Schematic Diagram

100 500

3.3 k

2.7 k

500

1.4 k

100 100 10 k

Input

Output

Gnd

240

200 0.3

6.0 k

2.0 k

30 pF

28 k

6.0 k 1.0 k 5.0 k

0.25 k

5.0 k

This device contains 19 active transistors.

Page 3

MCT7800

MOTOROLA

ELECTRICAL CHARACTERISTICS (V

= 10 V, IO = 500 mA, TJ = T

low

to T

high

[Note 1], unless otherwise noted.)

MCT7805B MCT7805C

Characteristics Symbol Min Typ Max Min Typ Max Unit

Output Voltage (TJ = +25°C) V

4.8 5.0 5.2 4.8 5.0 5.2 Vdc

Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PO ≤15 W)

7.0 Vdc ≤ Vin ≤ 20 Vdc

8.0 Vdc ≤ Vin ≤ 20 Vdc

—

4.75

—

5.0

—

5.25

4.75 —

5.0 —

5.25 —

Vdc

Line Regulation, TJ = +25°C (Note 2)

7.0 Vdc ≤ Vin ≤ 25 Vdc

8.0 Vdc ≤ Vin ≤ 12 Vdc

Reg

line

— —

7.0

2.0

100

— —

7.0

2.0

100

Load Regulation, TJ = +25°C (Note 2)

5.0 mA ≤ Vin ≤ 1.5 A 250 mA ≤ Vin ≤ 750 mA

Reg

load

— —

2.0

1.5

100

— —

2.0

1.5

100

Quiescent Current (TJ = +25°C) I

— 5.5 8.0 — 5.5 8.0 mA

Quiescent Current Change

7.0 Vdc ≤ Vin ≤ 25 Vdc

8.0 Vdc ≤ Vin ≤ 25 Vdc

5.0 mA ≤ IO ≤ 1.0 A

∆I

— — —

—

1.3

0.5

— — —

1.3 —

0.5

Ripple Rejection

8.0 Vdc ≤ Vin ≤ 18 Vdc, f = 120 Hz

— 65 — — 65 —

Dropout Voltage (IO = 1.0 A, TJ = +25°C) VI – V

— 2.0 — — 2.0 — Vdc

Output Noise Voltage (TA = +25°C)

10 Hz ≤ f ≤ 100 kHz

— 10 — — 10 —

µV/V

Output Resistance f = 1.0 kHz r

— 1.3 — — 1.3 — mΩ

Short Circuit Current Limit (TA = +25°C)

Vin = 35 Vdc

— 0.2 — — 0.2 —

Peak Output Current (TJ = +25°C) I

max

— 2.2 — — 2.2 — A

Average Temperature Coefficient of Output Voltage TCV

— 0.5 — — 0.5 — mV/°C

ELECTRICAL CHARACTERISTICS (V

= 11 V, IO = 500 mA, TJ = T

low

to T

high

[Note 1], unless otherwise noted.)

MCT7806B MCT7806C

Characteristics Symbol Min Typ Max Min Typ Max Unit

Output Voltage (TJ = +25°C) V

5.75 6.0 6.25 5.75 6.0 6.25 Vdc

Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PO ≤15 W)

8.0 Vdc ≤ Vin ≤ 21 Vdc

9.0 Vdc ≤ Vin ≤ 21 Vdc

—

5.7

—

6.0

—

6.3

5.7 —

6.0 —

6.3 —

Vdc

Line Regulation, TJ = +25°C (Note 2)

8.0 Vdc ≤ Vin ≤ 25 Vdc

9.0 Vdc ≤ Vin ≤ 13 Vdc

Reg

line

— —

7.0

2.0

120

— —

7.0

2.0

120

Load Regulation, TJ = +25°C (Note 2)

5.0 mA ≤ Vin ≤ 1.5 A 250 mA ≤ Vin ≤ 750 mA

Reg

load

— —

2.0

1.5

120

— —

2.0

1.5

120

Quiescent Current (TJ = +25°C) I

— 5.5 8.0 — 5.5 8.0 mA

Quiescent Current Change

8.0 Vdc ≤ Vin ≤ 25 Vdc

9.0 Vdc ≤ Vin ≤ 25 Vdc

5.0 mA ≤ IO ≤ 1.0 A

∆I

— — —

—

1.3

0.5

— — —

1.3 —

0.5

Ripple Rejection

9.0 Vdc ≤ Vin ≤ 19 Vdc, f = 120 Hz

— 65 — — 65 —

NOTES: 1. T

low

= 0°C for MCT78XXC T

high

= +125°C for MCT78XXB, C. When the junction temperature exceeds +125°C, internal current limiting

= – 40°C for MCT78XXB will reduce the output current to less than 1.0 A at a VI–VO of 15 V or

greater. The MC7800 die will supply more current under the same conditions.

2. Load and line 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.

Page 4

MCT7800

MCT7800 4

MOTOROLA

ELECTRICAL CHARACTERISTICS (continued)

(Vin = 11 V, IO = 500 mA, TJ = T

low

to T

high

[Note 1], unless otherwise noted.)

MCT7806B MCT7806C

Characteristics Symbol Min Typ Max Min Typ Max Unit

Dropout Voltage (IO = 1.0 A, TJ = +25°C) VI – V

— 2.0 — — 2.0 — Vdc

Output Noise Voltage (TA = +25°C)

10 Hz ≤ f ≤ 100 kHz

— 10 — — 10 —

µV/V

Output Resistance f = 1.0 kHz r

— 1.3 — — 1.3 — mΩ

Short Circuit Current Limit (TA = +25°C)

Vin = 35 Vdc

— 0.2 — — 0.2 —

Peak Output Current (TJ = +25°C) I

max

— 2.2 — — 2.2 — A

Average Temperature Coefficient of Output Voltage TCV

— –0.8 — — –0.8 — mV/°C

ELECTRICAL CHARACTERISTICS (V

= 14 V, IO = 500 mA, TJ = T

low

to T

high

[Note 1], unless otherwise noted.)

MCT7808B MCT7808C

Characteristics Symbol Min Typ Max Min Typ Max Unit

Output Voltage (TJ = +25°C) V

7.7 8.0 8.3 7.7 8.0 8.3 Vdc

Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PO ≤15 W)

10.5 Vdc ≤ Vin ≤ 23 Vdc

11.5 Vdc ≤ Vin ≤ 23 Vdc

—

7.6

—

8.0

—

8.4

7.6 —

8.0 —

8.4 —

Vdc

Line Regulation, TJ = +25°C (Note 2)

10.5 Vdc ≤ Vin ≤ 25 Vdc 11 Vdc ≤ Vin ≤ 17 Vdc

Reg

line

— —

7.0

2.0

160

— —

7.0

2.0

160

Load Regulation, TJ = +25°C (Note 2)

5.0 mA ≤ IO ≤ 1.5 A 250 mA ≤ IO ≤ 750 mA

Reg

load

— —

2.0

1.5

160

— —

2.0

1.5

160

Quiescent Current (TJ = +25°C) I

— 5.5 8.0 — 5.5 8.0 mA

Quiescent Current Change

10.5 Vdc ≤ Vin ≤ 25 Vdc

11.5 Vdc ≤ Vin ≤ 25 Vdc

5.0 mA ≤ IO ≤ 1.0 A

∆I

— — —

—

1.0

0.5

— — —

1.0 —

0.5

Ripple Rejection

11.5 Vdc ≤ Vin ≤ 21.5 Vdc, f = 120 Hz

— 63 — — 63 —

Dropout Voltage (IO = 1.0 A, TJ = +25°C) VI – V

— 2.0 — — 2.0 — Vdc

Output Noise Voltage (TA = +25°C)

10 Hz ≤ f ≤ 100 kHz

— 10 — — 10 —

µV/V

Output Resistance f = 1.0 kHz r

— 18 — — 18 — mΩ

Short Circuit Current Limit (TA = +25°C)

Vin = 35 Vdc

— 0.2 — — 0.2 —

Peak Output Current (TJ = +25°C) I

max

— 2.2 — — 2.2 — A

Average Temperature Coefficient of Output Voltage TCV

— –0.8 — — –0.8 — mV/°C

NOTES: 1. T

low

= 0°C for MCT78XXC T

high

= +125°C for MCT78XXB, C. When the junction temperature exceeds +125°C, internal current limiting

= – 40°C for MCT78XXB will reduce the output current to less than 1.0 A at a VI–VO of 15 V or

greater. The MC7800 die will supply more current under the same conditions.

2. Load and line 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.

Page 5

MCT7800

MOTOROLA

ELECTRICAL CHARACTERISTICS (V

= 15 V, IO = 500 mA, TJ = T

low

to T

high

[Note 1], unless otherwise noted.)

MCT7809B MCT7809C

Characteristics Symbol Min Typ Max Min Typ Max Unit

Output Voltage (TJ = +25°C) V

8.65 9.0 9.35 8.65 9.0 9.35 Vdc

Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PO ≤15 W)

11.5 Vdc ≤ Vin ≤ 24 Vdc

12.5 Vdc ≤ Vin ≤ 24 Vdc

—

8.55

—

9.0

—

9.45

8.55 —

9.0 —

9.45 —

Vdc

Line Regulation, TJ = +25°C (Note 2)

11.5 Vdc ≤ Vin ≤ 26 Vdc

11.5 Vdc ≤ Vin ≤ 17 Vdc

Reg

line

— —

8.0

4.0

50 25

— —

8.0

4.0

50 25

Load Regulation, TJ = +25°C (Note 2)

5.0 mA ≤ IO ≤ 1.5 A 250 mA ≤ IO ≤ 750 mA

Reg

load

— —

3.0

2.0

50 25

— —

3.0

2.0

50 25

Quiescent Current (TJ = +25°C) I

— 5.5 8.0 — 5.5 8.0 mA

Quiescent Current Change

11.5 Vdc ≤ Vin ≤ 26 Vdc

12.5 Vdc ≤ Vin ≤ 26 Vdc

5.0 mA ≤ IO ≤ 1.0 A

∆I

— — —

—

1.0

0.5

— — —

1.0 —

0.5

Ripple Rejection

11.5 Vdc ≤ Vin ≤ 21.5 Vdc, f = 120 Hz

— 62 — — 62 —

Dropout Voltage (IO = 1.0 A, TJ = +25°C) VI – V

— 2.0 — — 2.0 — Vdc

Output Noise Voltage (TA = +25°C)

10 Hz ≤ f ≤ 100 kHz

— 10 — — 10 —

µV/V

Output Resistance f = 1.0 kHz r

— 18 — — 18 — mΩ

Short Circuit Current Limit (TA = +25°C)

Vin = 35 Vdc

— 0.2 — — 0.2 —

Peak Output Current (TJ = +25°C) I

max

— 2.2 — — 2.2 — A

Average Temperature Coefficient of Output Voltage TCV

— –1.0 — — –1.0 — mV/°C

ELECTRICAL CHARACTERISTICS (V

= 19 V, IO = 500 mA, TJ = T

low

to T

high

[Note 1], unless otherwise noted.)

MCT7812B MCT7812C

Characteristics Symbol Min Typ Max Min Typ Max Unit

Output Voltage (TJ = +25°C) V

11.5 12 12.5 11.5 12 12.5 Vdc

Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PO ≤15 W)

14.5 Vdc ≤ Vin ≤ 27 Vdc

15.5 Vdc ≤ Vin ≤ 27 Vdc

—

11.4

— 12

—

12.6

11.4 —

12 —

12.6 —

Vdc

Line Regulation, TJ = +25°C (Note 2)

14.5 Vdc ≤ Vin ≤ 30 Vdc 16 Vdc ≤ Vin ≤ 22 Vdc

Reg

line

— —

5.0

240 120

— —

5.0

240 120

Load Regulation, TJ = +25°C (Note 2)

5.0 mA ≤ IO ≤ 1.5 A 250 mA ≤ IO ≤ 750 mA

Reg

load

— —

3.0

2.0

240 120

— —

3.0

2.0

240 120

Quiescent Current (TJ = +25°C) I

— 5.5 8.0 — 5.5 8.0 mA

Quiescent Current Change

14.5 Vdc ≤ Vin ≤ 30 Vdc 15 Vdc ≤ Vin ≤ 30 Vdc

5.0 mA ≤ IO ≤ 1.0 A

∆I

— — —

—

1.0

0.5

— — —

1.0 —

0.5

NOTES: 1. T

low

= 0°C for MCT78XXC T

high

= +125°C for MCT78XXB, C. When the junction temperature exceeds +125°C, internal current limiting

= – 40°C for MCT78XXB will reduce the output current to less than 1.0 A at a VI–VO of 15 V or

greater. The MC7800 die will supply more current under the same conditions.

2. Load and line 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.

Page 6

MCT7800

MCT7800 6

MOTOROLA

ELECTRICAL CHARACTERISTICS (continued)

(Vin = 19 V, IO = 500 mA, TJ = T

low

to T

high

[Note 1], unless otherwise noted.)

MCT7812B MCT7812C

Characteristics Symbol Min Typ Max Min Typ Max Unit

Ripple Rejection

15 Vdc ≤ Vin ≤ 25 Vdc, f = 120 Hz

— 62 — — 62 —

Dropout Voltage (IO = 1.0 A, TJ = +25°C) VI – V

— 2.0 — — 2.0 — Vdc

Output Noise Voltage (TA = +25°C)

10 Hz ≤ f ≤ 100 kHz

— 10 — — 10 —

µV/V

Output Resistance f = 1.0 kHz r

— 18 — — 18 — mΩ

Short Circuit Current Limit (TA = +25°C)

Vin = 35 Vdc

— 0.2 — — 0.2 —

Peak Output Current (TJ = +25°C) I

max

— 2.2 — — 2.2 — A

Average Temperature Coefficient of Output Voltage TCV

— –1.0 — — –1.0 — mV/°C

ELECTRICAL CHARACTERISTICS (V

= 23 V, IO = 500 mA, TJ = T

low

to T

high

[Note 1], unless otherwise noted.)

MCT7815B MCT7815C

Characteristics Symbol Min Typ Max Min Typ Max Unit

Output Voltage (TJ = +25°C) V

14.4 15 15.6 14.4 15 15.6 Vdc

Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PO ≤15 W)

17.5 Vdc ≤ Vin ≤ 30 Vdc

18.5 Vdc ≤ Vin ≤ 30 Vdc

—

14.25

— 15

—

15.75

14.25 —

15 —

15.75 —

Vdc

Line Regulation, TJ = +25°C (Note 2)

17.5 Vdc ≤ Vin ≤ 30 Vdc 20 Vdc ≤ Vin ≤ 26 Vdc

Reg

line

— —

5.0

300 150

— —

5.0

300 150

Load Regulation, TJ = +25°C (Note 2)

5.0 mA ≤ Vin ≤ 1.5 A 250 mA ≤ Vin ≤ 750 mA

Reg

load

— —

3.0

2.0

300 150

— —

3.0

2.0

300 150

Quiescent Current (TJ = +25°C) I

— 5.5 8.0 — 5.5 8.0 mA

Quiescent Current Change

17.5 Vdc ≤ Vin ≤ 30 Vdc

18.5 Vdc ≤ Vin ≤ 30 Vdc

5.0 mA ≤ IO ≤ 1.0 A

∆I

— — —

—

1.0

0.5

— — —

1.0 —

0.5

Ripple Rejection

18.5 Vdc ≤ Vin ≤ 28.5 Vdc, f = 120 Hz

— 60 — — 60 —

Dropout Voltage (IO = 1.0 A, TJ = +25°C) VI – V

— 2.0 — — 2.0 — Vdc

Output Noise Voltage (TA = +25°C)

10 Hz ≤ f ≤ 100 kHz

— 10 — — 10 —

µV/V

Output Resistance f = 1.0 kHz r

— 19 — — 19 — mΩ

Short Circuit Current Limit (TA = +25°C)

Vin = 35 Vdc

— 0.2 — — 0.2 —

Peak Output Current (TJ = +25°C) I

max

— 2.2 — — 2.2 — A

Average Temperature Coefficient of Output Voltage TCV

— –1.0 — — –1.0 — mV/°C

NOTES: 1. T

low

= 0°C for MCT78XXC T

high

= +125°C for MCT78XXB, C. When the junction temperature exceeds +125°C, internal current limiting

= – 40°C for MCT78XXB will reduce the output current to less than 1.0 A at a VI–VO of 15 V or

greater. The MC7800 die will supply more current under the same conditions.

2. Load and line 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.

Page 7

MCT7800

MOTOROLA

ELECTRICAL CHARACTERISTICS (V

= 27 V, IO = 500 mA, TJ = T

low

to T

high

[Note 1], unless otherwise noted.)

MCT7818B MCT7818C

Characteristics Symbol Min Typ Max Min Typ Max Unit

Output Voltage (TJ = +25°C) V

17.3 18 18.7 17.3 18 18.7 Vdc

Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PO ≤15 W)

21 Vdc ≤ Vin ≤ 33 Vdc 22 Vdc ≤ Vin ≤ 33 Vdc

—

17.1

— 18

—

18.9

17.1 —

18 —

18.9 —

Vdc

Line Regulation, TJ = +25°C (Note 2)

21 Vdc ≤ Vin ≤ 33 Vdc 24 Vdc ≤ Vin ≤ 30 Vdc

Reg

line

— —

5.0

360 180

— —

5.0

360 180

Load Regulation, TJ = +25°C (Note 2)

5.0 mA ≤ Vin ≤ 1.5 A 250 mA ≤ Vin ≤ 750 mA

Reg

load

— —

4.0

3.0

360 180

— —

4.0

3.0

360 180

Quiescent Current (TJ = +25°C) I

— 5.5 8.0 — 5.5 8.0 mA

Quiescent Current Change

21 Vdc ≤ Vin ≤ 33 Vdc 22 Vdc ≤ Vin ≤ 33 Vdc

5.0 mA ≤ IO ≤ 1.0 A

∆I

— — —

—

1.0

0.5

— — —

1.0 —

0.5

Ripple Rejection

22 Vdc ≤ Vin ≤ 32 Vdc, f = 120 Hz

— 59 — — 59 —

Dropout Voltage (IO = 1.0 A, TJ = +25°C) ViI – V

— 2.0 — — 2.0 — Vdc

Output Noise Voltage (TA = +25°C)

10 Hz ≤ f ≤ 100 kHz

— 10 — — 10 —

µV/V

Output Resistance f = 1.0 kHz r

— 19 — — 19 — mΩ

Short Circuit Current Limit (TA = +25°C)

Vin = 35 Vdc

— 0.2 — — 0.2 —

Peak Output Current (TJ = +25°C) I

max

— 2.2 — — 2.2 — A

Average Temperature Coefficient of Output Voltage TCV

— –1.0 — — –1.0 — mV/°C

ELECTRICAL CHARACTERISTICS (V

= 33 V, IO = 500 mA, TJ = T

low

to T

high

[Note 1], unless otherwise noted.)

MCT7824B MCT7824C

Characteristics Symbol Min Typ Max Min Typ Max Unit

Output Voltage (TJ = +25°C) V

23 24 25 23 24 25 Vdc

Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PO ≤15 W)

27 Vdc ≤ Vin ≤ 38 Vdc 28 Vdc ≤ Vin ≤ 38 Vdc

—

22.8

— 24

—

25.2

22.8 —

24 —

25.2 —

Vdc

Line Regulation, TJ = +25°C (Note 2)

27 Vdc ≤ Vin ≤ 38 Vdc 30 Vdc ≤ Vin ≤ 36 Vdc

Reg

line

— —

6.0

480 240

— —

6.0

480 240

Load Regulation, TJ = +25°C (Note 2)

5.0 mA ≤ IO ≤ 1.5 A 250 mA ≤ IO ≤ 750 mA

Reg

load

— —

5.0

4.0

480 240

— —

5.0

4.0

480 240

Quiescent Current (TJ = +25°C) I

— 5.5 8.0 — 5.5 8.0 mA

Quiescent Current Change

27 Vdc ≤ Vin ≤ 38 Vdc 28 Vdc ≤ Vin ≤ 38 Vdc

5.0 mA ≤ IO ≤ 1.0 A

∆I

— — —

—

1.0

0.5

— — —

1.0 —

0.5

Ripple Rejection

28 Vdc ≤ Vin ≤ 38 Vdc, f = 120 Hz

— 56 — — 56 —

Dropout Voltage (IO = 1.0 A, TJ = +25°C) VI – V

— 2.0 — — 2.0 — Vdc

Output Noise Voltage (TA = +25°C)

10 Hz ≤ f ≤ 100 kHz

— 10 — — 10 —

µV/V

Output Resistance f = 1.0 kHz r

— 20 — — 20 — mΩ

Short Circuit Current Limit (TA = +25°C)

Vin = 35 Vdc

— 0.2 — — 0.2 —

Peak Output Current (TJ = +25°C) I

max

— 2.2 — — 2.2 — A

Average Temperature Coefficient of Output Voltage TCV

— –1.5 — — –1.5 — mV/°C

NOTES: 1. T

low

= 0°C for MCT78XXC T

high

= +125°C for MCT78XXB, C. When the junction temperature exceeds +125°C, internal current limiting

= – 40°C for MCT78XXB will reduce the output current to less than 1.0 A at a VI–VO of 15 V or

greater. The MC7800 die will supply more current under the same conditions.

2. Load and line 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.

Page 8

MCT7800

MCT7800 8

MOTOROLA

Figure 1. Peak Output Current as a Function of

Input-Output Differential Voltage

Figure 2. Ripple Rejection as a Function of

Output Voltages (MCT78XXC)

Figure 3. Ripple Rejection as a Function of

Frequency (MCT78XXC)

Figure 4. Output Impedance as a Function of

Output Voltage (MCT78XXC)

Figure 5. Quiescent Current as a

Function of Temperature

VI – VO, INPUT-OUPUT VOLTAGE DIFFERENTIAL (V)

4.0

3.0

2.0

1.0

0 10 20 30 40

, OUTPUT CURRENT (A)

TJ = –40°C

TJ = +125°C

TJ = +25°C

4.0 6.0 8.0 10 12 14 16 18 20 22 24 VO, OUTPUT VOLTAGE (V)

RR, RIPPLE REJECTION (dB)

f = 120 Hz IO = 20 mA

∆

Vin = 1.0 Vrms

RR, RIPPLE REJECTION (dB)

100 1.0 k 10 k 100 k

f, FREQUENCY (Hz)

Vin = 10 V VO = 5.0 V IO = 20 mA

f = 120 Hz IO = 500 mA CL = 0

, OUTPUT IMPEDANCE (m )

Ω

1000

500 300

200

100

50 30

4.0 8.0 12 16 20 24 VO, OUTPUT VOLTAGE (V)

, QUIESCENT CURRENT (mA)

6.0

4.0

3.0

2.0

1.0

0 –75 – 50

TJ, JUNCTION TEMPERATURE (

– 25 0 25 50 75 100 125

Vin = 10 V VO = 5.0 V IO = 20 mA

MCT7805C 10 V MCT7812C 19 V MCT7815C 23 V

Device

Page 9

MCT7800

MOTOROLA

APPLICATIONS INFORMATION

Design Considerations

The MCT7800 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 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 regulators’ 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.

Figure 6. Worst Case Power Dissipation versus

Ambient Temperature (Case 221A)

Figure 7. Input Output Differential as a

Function of Junction Temperature

, POWER DISSIPATION (W)

8.0

4.0

– 50 – 25 0 25 50 75 100 125 150

TA, AMBIENT TEMPERATURE (

No Heatsink

= 0

C/W

= 5

C/W

= 65

C/W

J(max)

= +150

DIFFERENTIAL (V)

I O

, INPUT-OUTPUT VOLTAGE

2.5

2.0

1.5

1.0

–75 – 50 – 25 0 25 50 75 100 125

TJ, JUNCTION TEMPERATURE (

– VV

IO = 1.0 A

200 mA

500 mA

0 mA

20 mA

0.5

= 15

C/W

= 5

C/W

∆

VO = 2% of V

– – – Extended Curve for MCT78XXB

Figure 8. D2PAK Thermal Resistance and Maximum

Power Dissipation versus P.C.B. Copper Length

R , THERMAL RESISTANCE

JUNCTION-TO-AIR ( C/W)

1.0

1.5

2.0

2.5

3.0

3.5

0 10 20 3025155.0

L, LENGTH OF COPPER (mm)

D(max)

for TA = 50°C

Minimum Size Pad

2.0 oz. Copper L

Free Air

Mounted

Vertically

, MAXIMUM POWER DISSIPATION (W)

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.

Quiescent 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.

Page 10

MCT7800

MCT7800 10

MOTOROLA

OUTLINE DIMENSIONS

MIN MINMAX MAX

INCHES MILLIMETERS

DIM

A B C D F G H J K L N Q R S T U V Z

14.48

9.66

4.07

0.64

3.61

2.42

2.80

0.46

12.70

1.15

4.83

2.54

2.04

1.15

5.97

0.00

1.15 —

15.75

10.28

4.82

0.88

3.73

2.66

3.93

0.64

14.27

1.52

5.33

3.04

2.79

1.39

6.47

1.27 —

2.04

0.570

0.380

0.160

0.025

0.142

0.095

0.110

0.018

0.500

0.045

0.190

0.100

0.080

0.045

0.235

0.000

0.045 —

0.620

0.405

0.190

0.035

0.147

0.105

0.155

0.025

0.562

0.060

0.210

0.120

0.110

0.055

0.255

0.050 —

0.080

NOTES:

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

2. CONTROLLING DIMENSION: INCH.

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

-T-

SEATING PLANE

1 2 3

D2T SUFFIX

PLASTIC PACKAGE

CASE 936-03

(D2PAK)

5 REF5 REF

1 2 3

0.010 (0.254) T

-T-

TERMINAL 4

NOTES:

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

2. CONTROLLING DIMENSION: INCH.

3. TAB CONTOUR OPTIONAL WITHIN DIMENSIONS A AND K.

4. DIMENSIONS U AND V ESTABLISH A MINIMUM MOUNTING SURFACE FOR TERMINAL 4.

5. DIMENSIONS A AND B DO NOT INCLUDE MOLD FLASH OR GATE PROTRUSIONS. MOLD FLASH AND GATE PROTRUSIONS NOT TO EXCEED

0.025 (0.635) MAXIMUM.

DIMAMIN MAX MIN MAX

MILLIMETERS

0.386 0.403 9.804 10.236

INCHES

B 0.356 0.368 9.042 9.347 C 0.170 0.180 4.318 4.572 D 0.026 0.036 0.660 0.914 E 0.045 0.055 1.143 1.397 F 0.051 REF 1.295 REF G 0.100 BSC 2.540 BSC H 0.539 0.579 13.691 14.707 J 0.125 MAX 3.175 MAX K 0.050 REF 1.270 REF L 0.000 0.010 0.000 0.254 M 0.088 0.102 2.235 2.591 N 0.018 0.026 0.457 0.660 P 0.058 0.078 1.473 1.981 R S 0.116 REF 2.946 REF U 0.200 MIN 5.080 MIN V 0.250 MIN 6.350 MIN

_ _

OPTIONAL CHAMFER

T SUFFIX

PLASTIC PACKAGE

CASE 221A-06

Page 11

MCT7800

MOTOROLA

NOTES

Page 12

MCT7800

MCT7800 12

MOTOROLA

Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding 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 can and do vary in different applications. All operating parameters, including “T ypicals” must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer.

Literature Distribution Centers:

USA: Motorola Literature Distribution; P.O. Box 20912; Phoenix, Arizona 85036. EUROPE: Motorola Ltd.; European Literature Centre; 88 T anners Drive, Blakelands, Milton Keynes, MK14 5BP, England. JAPAN: Nippon Motorola Ltd.; 4-32-1, Nishi-Gotanda, Shinagawa-ku, Tokyo 141, Japan. ASIA PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Center, No. 2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong.

MCT7800/D

*MCT7800/D*

◊

1PHX33530-3 PRINTED IN USA (8/94) MPS/POD LINEAR YCAAAA

Datasheet MCT7824BT, MCT7824CD2T, MCT7824CT, MCT7818CD2T, MCT7818CT Datasheet (Motorola)

Specifications and Main Features

Frequently Asked Questions

User Manual