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MC7900

Series

DEVICE TYPE/NOMINAL OUTPUT VOLTAGE

MC7905

MC7905.2

MC7906

MC7908

5.0 V

5.2 V

6.0 V

8.0 V

MC7912

MC7915

MC7918

MC7924

12 V

15 V

28 V

24 V

THREE–TERMINAL

NEGATIVE FIXED

VOLTAGE REGULATORS

Pin 1. Ground

2. Input

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 more negative even

during the high point of the input ripple voltage.

These two digits of the type number

indicate nominal voltage.

Cin is required if regulator is located an

appreciable distance from power supply filter.

CO improve stability and transient response.

MC79XX

Input

Cin*

0.33 

µ

F

CO**

1.0 

µ

F

Output

T SUFFIX

PLASTIC PACKAGE

CASE 221A

Heatsink surface

connected to Pin 2.

D2T SUFFIX

PLASTIC PACKAGE

CASE 936

(D2PAK)

3

1

2

3

1

2

Heatsink surface (shown as terminal 4 in

case outline drawing) is connected to Pin 2.

XX,

*

*

**

Order this document by MC7900/D

1

MOTOROLA ANALOG IC DEVICE DATA

Three-Terminal  Negative 

Voltage  Regulators

The MC7900 series of fixed output negative voltage regulators are

intended as complements to the popular MC7800 series devices. These

negative regulators are available in the same seven–voltage options as the

MC7800 devices. In addition, one extra voltage option commonly employed

in MECL systems is also available in the negative MC7900 series.

Available in fixed output voltage options from – 5.0 V to – 24 V, these

regulators employ current limiting, thermal shutdown, and safe–area

compensation – making them remarkably rugged under most operating

conditions. With adequate heatsinking they can deliver output currents in

excess of 1.0 A.

No External Components Required

Internal Thermal Overload Protection

Internal Short Circuit Current Limiting

Output Transistor Safe–Area Compensation

Available in 2% Voltage Tolerance (See Ordering Information)

Representative Schematic Diagram

Gnd

VO

VI

2.4 k

25

3.6 k

1.2 k

1.1 k

2.0 k

12 k

1.0 k

4.0 k

2.0 k

14.7 k

2.0 k

8.0 k

1.0 k

1.6 k

4.0 k

0.3

10 k

10 k

20 k

20 k

20 pF

10 pF

240

750

R1

R2

This device contains 26 active transistors.

ORDERING INFORMATION

Device

Output Voltage

Tolerance

Operating

Temperature Range

Package

MC79XXACD2T

2%

T

0

°

125

°

C

Surface Mount

MC79XXCD2T

4%

TJ = 0

°

to +125

°

C

Surface Mount

MC79XXACT

2%

TJ = 0

°

 to +125

°

C

Insertion Mount

MC79XXCT

4%

Insertion Mount

MC79XXBD2T

4%

TJ = – 40

°

to +125

°

C

Surface Mount

MC79XXBT

4%

TJ = – 40

°

 to +125

°

C

Insertion Mount

XX indicates nominal voltage.

©

Motorola, Inc. 1996

Rev 6

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MC7900

2

MOTOROLA ANALOG IC DEVICE DATA

MAXIMUM RATINGS

 (TA = +25

°

C, unless otherwise noted.)

Rating

Symbol

Value

Unit

Input Voltage (– 5.0 V 

 VO 

 –18 V)

Input Voltage

(24 V)

VI

– 35

– 40

Vdc

Power Dissipation

Case 221A

TA = +25

°

C

PD

Internally Limited

W

Thermal Resistance, Junction–to–Ambient

θ

JA

65

°

C/W

Thermal Resistance, Junction–to–Case

θ

JC

5.0

°

C/W

Case 936 (D2PAK)

TA = +25

°

C

PD

Internally Limited

W

Thermal Resistance, Junction–to–Ambient

θ

JA

70

°

C/W

Thermal Resistance, Junction–to–Case

θ

JC

5.0

°

C/W

Storage Junction Temperature Range

Tstg

– 65 to +150

°

C

Junction Temperature

TJ

+150

°

C

THERMAL CHARACTERISTICS

Characteristics

Symbol

Max

Unit

Thermal Resistance, Junction–to–Ambient

R

θ

JA

65

°

C/W

Thermal Resistance, Junction–to–Case

R

θ

JC

5.0

°

C/W

MC7905C 

ELECTRICAL CHARACTERISTICS 

(VI = –10 V, IO = 500 mA, 0

°

C < TJ < +125

°

C, unless otherwise noted.)

Characteristics

Symbol

Min

Typ

Max

Unit

Output Voltage (TJ = +25

°

C)

VO

– 4.8

– 5.0

– 5.2

Vdc

Line Regulation (Note 1)

(TJ = +25

°

C, IO = 100 mA)

–7.0 Vdc 

 VI 

 – 25 Vdc

– 8.0 Vdc 

 VI 

 –12 Vdc

(TJ = +25

°

C, IO = 500 mA)

–7.0 Vdc 

 VI 

 – 25 Vdc

– 8.0 Vdc 

 VI 

 –12 Vdc

Regline

7.0

2.0

35

8.0

50

25

100

50

mV

Load Regulation, TJ = +25

°

C (Note 1)

5.0 mA 

 IO 

 1.5 A

250 mA 

 IO 

 750 mA

Regload

11

4.0

100

50

mV

Output Voltage

–7.0 Vdc 

 VI 

 – 20 Vdc, 5.0 mA 

 IO 

 1.0 A, P 

 15 W

VO

– 4.75

– 5.25

Vdc

Input Bias Current (TJ = +25

°

C)

IIB

4.3

8.0

mA

Input Bias Current Change

–7.0 Vdc 

 VI 

 – 25 Vdc

5.0 mA 

 IO 

 1.5 A

IIB

1.3

0.5

mA

Output Noise Voltage (TA = +25

°

C, 10 Hz 

 f 

 100 kHz)

Vn

40

µ

V

Ripple Rejection (IO = 20 mA, f = 120 Hz)

RR

70

dB

Dropout Voltage

IO = 1.0 A, TJ = +25

°

C

VI–VO

2.0

Vdc

Average Temperature Coefficient of Output Voltage

IO = 5.0 mA, 0

°

 TJ 

 +125

°

C

VO/

T

–1.0

mV/

°

C

NOTE: 1. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. 

NOTE: 1.

Pulse testing with low duty cycle is used.

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MC7900

3

MOTOROLA ANALOG IC DEVICE DATA

MC7905AC 

ELECTRICAL CHARACTERISTICS 

(VI = –10 V, IO = 500 mA, 0

°

C < TJ < +125

°

C, unless otherwise noted.)

Characteristics

Symbol

Min

Typ

Max

Unit

Output Voltage (TJ = +25

°

C)

VO

– 4.9

– 5.0

– 5.1

Vdc

Line Regulation (Note 1)

– 8.0 Vdc 

 VI 

 –12 Vdc; IO = 1.0 A, TJ = +25

°

C

– 8.0 Vdc 

 VI 

 –12 Vdc; IO = 1.0 A

–7.5 Vdc 

 VI 

 – 25 Vdc; IO = 500 mA

–7.0 Vdc 

 VI 

 – 20 Vdc; IO = 1.0 A, TJ = +25

°

C

Regline

2.0

7.0

7.0

6.0

25

50

50

50

mV

Load Regulation (Note 1)

5.0 mA 

 IO 

 1.5 A, TJ = +25

°

C

250 mA 

 IO 

 750 mA

5.0 mA 

 IO 

 1.0 A

Regload

11

4.0

9.0

100

50

100

mV

Output Voltage

–7.5 Vdc 

 VI 

 – 20 Vdc, 5.0 mA 

 IO 

 1.0 A, P 

 15 W

VO

– 4.80

– 5.20

Vdc

Input Bias Current

IIB

4.4

8.0

mA

Input Bias Current Change

–7.5 Vdc 

 VI 

 – 25 Vdc

5.0 mA 

 IO 

 1.0 A

5.0 mA 

 IO 

 1.5 A, TJ = +25

°

C

IIB

1.3

0.5

0.5

mA

Output Noise Voltage (TA = +25

°

C, 10 Hz 

 f 

 100 kHz)

Vn

40

µ

V

Ripple Rejection (IO = mA, f = 120 Hz)

RR

70

dB

Dropout Voltage

IO = 1.0 A. TJ = +25

°

C

VI–VO

2.0

Vdc

Average Temperature Coefficient of Output Voltage

IO = 5.0 A, 0

°

 TJ 

 +125

°

C

VO/

T

–1.0

mV/

°

C

MC7905.2C 

ELECTRICAL CHARACTERISTICS 

(VI = –10 V, IO = 500 mA, 0

°

C < TJ < +125

°

C, unless otherwise noted.)

Characteristics

Symbol

Min

Typ

Max

Unit

Output Voltage (TJ = +25

°

C)

VO

– 5.0

– 5.2

– 5.4

Vdc

Line Regulation (Note 1)

(TJ = +25

°

C, IO = 100 mA)

–7.2 Vdc 

 VI 

 – 25 Vdc

– 8.0 Vdc 

 VI 

 –12 Vdc

(TJ = +25

°

C, IO = 500 mA)

–7.2 Vdc 

 VI 

 – 25 Vdc

– 8.0 Vdc 

 VI 

 –12 Vdc

Regline

8.0

2.2

37

8.5

52

27

105

52

mV

Load Regulation, TJ = +25

°

C (Note 1)

5.0 mA 

 IO 

 1.5 A

250 mA 

 IO 

 750 mA

Regload

12

4.5

105

52

mV

Output Voltage

–7.2 Vdc 

 VI 

 – 20 Vdc, 5.0 mA 

 IO 

 1.0 A, P 

 15 W

VO

– 4.95

– 5.45

Vdc

Input Bias Current (TJ = +25

°

C)

IIB

4.3

8.0

mA

Input Bias Current Change

–7.2 Vdc 

 VI 

 – 25 Vdc

5.0 mA 

 IO 

 1.5 A

IIB

1.3

0.5

mA

Output Noise Voltage (TA = +25

°

C, 10 Hz 

 f 

 100 kHz)

Vn

42

µ

V

Ripple Rejection (IO = 20 mA, f = 120 Hz)

RR

68

dB

Dropout Voltage

IO = 1.0 A, TJ = +25

°

C

VI–VO

2.0

Vdc

Average Temperature Coefficient of Output Voltage

IO = 5.0 mA, 0

°

 TJ 

 +125

°

C

VO/

T

–1.0

mV/

°

C

NOTE: 1. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. 

NOTE: 1.

Pulse testing with low duty cycle is used.

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MC7900

4

MOTOROLA ANALOG IC DEVICE DATA

MC7906C

ELECTRICAL CHARACTERISTICS 

(VI = –11 V, IO = 500 mA, 0

°

C < TJ < +125

°

C, unless otherwise noted.)

Characteristics

Symbol

Min

Typ

Max

Unit

Output Voltage (TJ = +25

°

C)

VO

– 5.75

– 6.0

– 6.25

Vdc

Line Regulation (Note 1)

(TJ = +25

°

C, IO = 100 mA)

– 8.0 Vdc 

 VI 

 – 25 Vdc

–9.0 Vdc 

 VI 

 –13 Vdc

(TJ = +25

°

C, IO = 500 mA)

– 8.0 Vdc 

 VI 

 – 25 Vdc

– 9.0 Vdc 

 VI 

 –13 Vdc

Regline

9.0

3.0

43

10

60

30

120

60

mV

Load Regulation, TJ = +25

°

C (Note 1)

5.0 mA 

 IO 

 1.5 A

250 mA 

 IO 

 750 mA

Regload

13

5.0

120

60

mV

Output Voltage

– 8.0 Vdc 

 VI 

 – 21 Vdc, 5.0 mA 

 IO 

 1.0 A, P 

 15 W

VO

– 5.7

– 6.3

Vdc

Input Bias Current (TJ = +25

°

C)

IIB

4.3

8.0

mA

Input Bias Current Change

– 8.0 Vdc 

 VI 

 – 25 Vdc

5.0 mA 

 IO 

 1.5 A

IIB

1.3

0.5

mA

Output Noise Voltage (TA = +25

°

C, 10 Hz 

 f 

 100 kHz)

Vn

45

µ

V

Ripple Rejection (IO = 20 mA, f = 120 Hz)

RR

65

dB

Dropout Voltage

IO = 1.0 A, TJ = +25

°

C

VI–VO

2.0

Vdc

Average Temperature Coefficient of Output Voltage

IO = 5.0 A, 0

°

 TJ 

 +125

°

C

VO/

T

–1.0

mV/

°

C

MC7908C 

ELECTRICAL CHARACTERISTICS 

(VI = –14 V, IO = 500 mA, 0

°

C < TJ < +125

°

C, unless otherwise noted.)

Characteristics

Symbol

Min

Typ

Max

Unit

Output Voltage (TJ = +25

°

C)

VO

–7.7

– 8.0

– 8.3

Vdc

Line Regulation (Note 1)

(TJ = +25

°

C, IO = 100 mA)

–10.5 Vdc 

 VI 

 –25 Vdc

–11 Vdc 

 VI 

 –17 Vdc

(TJ = +25

°

C, IO = 500 mA)

–10.5 Vdc 

 VI 

 –25 Vdc

–11 Vdc 

 VI 

 –17 Vdc

Regline

12

5.0

50

22

80

40

160

80

mV

Load Regulation, TJ = +25

°

C (Note 1)

5.0 mA 

 IO 

 1.5 A

250 mA 

 IO 

 750 mA

Regload

26

9.0

160

80

mV

Output Voltage

–10.5 Vdc 

 VI 

 – 23 Vdc, 5.0 mA 

 IO 

 1.0 A, P 

 15 W

VO

–7.6

– 8.4

Vdc

Input Bias Current (TJ = +25

°

C)

IIB

4.3

8.0

mA

Input Bias Current Change

–10.5 Vdc 

 VI 

 – 25 Vdc

5.0 mA 

 IO 

 1.5 A

IIB

1.0

0.5

mA

Output Noise Voltage (TA = +25

°

C, 10 Hz 

 f 

 100 kHz)

Vn

52

µ

V

Ripple Rejection (IO = 20 mA, f = 120 Hz)

RR

62

dB

Dropout Voltage

IO = 1.0 A, TJ = +25

°

C

VI–VO

2.0

Vdc

Average Temperature Coefficient of Output Voltage

IO = 5.0 mA, 0

°

 TJ 

 +125

°

C

VO/

T

–1.0

mV/

°

C

NOTE: 1. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. 

NOTE: 1.

Pulse testing with low duty cycle is used.

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MC7900

5

MOTOROLA ANALOG IC DEVICE DATA

MC7912C 

ELECTRICAL CHARACTERISTICS 

(VI = –19 V, IO = 500 mA, 0

°

C < TJ < +125

°

C, unless otherwise noted.)

Characteristics

Symbol

Min

Typ

Max

Unit

Output Voltage (TJ = +25

°

C)

VO

–11.5

–12

–12.5

Vdc

Line Regulation (Note 1)

(TJ = +25

°

C, IO = 100 mA)

–14.5 Vdc 

 VI 

 – 30 Vdc

–16 Vdc 

 VI 

 – 22 Vdc

(TJ = +25

°

C, IO = 500 mA)

–14.5 Vdc 

 VI 

 – 30 Vdc

–16 Vdc 

 VI 

 – 22 Vdc

Regline

13

6.0

55

24

120

60

240

120

mV

Load Regulation, TJ = +25

°

C (Note 1)

5.0 mA 

 IO 

 1.5 A

250 mA 

 IO 

 750 mA

Regload

46

17

240

120

mV

Output Voltage

–14.5 Vdc 

 VI 

 – 27 Vdc, 5.0 mA 

 IO 

 1.0 A, P 

 15 W

VO

–11.4

–12.6

Vdc

Input Bias Current (TJ = +25

°

C)

IIB

4.4

8.0

mA

Input Bias Current Change

–14.5 Vdc 

 VI 

 – 30 Vdc

5.0 mA 

 IO 

 1.5 A

IIB

1.0

0.5

mA

Output Noise Voltage (TA = +25

°

C, 10 Hz 

 f 

 100 kHz)

Vn

75

µ

V

Ripple Rejection (IO = 20 mA, f = 120 Hz)

RR

61

dB

Dropout Voltage

IO = 1.0 A, TJ = +25

°

C

VI–VO

2.0

Vdc

Average Temperature Coefficient of Output Voltage

IO = 5.0 mA, 0

°

 TJ 

 +125

°

C

VO/

T

–1.0

mV/

°

C

MC7912AC 

ELECTRICAL CHARACTERISTICS 

(VI = –19 V, IO = 500 mA, 0

°

C < TJ < +125

°

C, unless otherwise noted.)

Characteristics

Symbol

Min

Typ

Max

Unit

Output Voltage (TJ = +25

°

C)

VO

–11.75

–12

–12.25

Vdc

Line Regulation (Note 1)

–16 Vdc 

 VI 

 – 22 Vdc; IO = 1.0 A, TJ = +25

°

C

–16 Vdc 

 VI 

 – 22 Vdc; IO = 1.0 A

–14.8 Vdc 

 VI 

 – 30 Vdc; IO = 500 mA

–14.5 Vdc 

 VI 

 – 27 Vdc; IO = 1.0 A, TJ = +25

°

C

Regline

6.0

24

24

13

60

120

120

120

mV

Load Regulation (Note 1)

5.0 mA 

 IO 

 1.5 A, TJ = +25

°

C

250 mA 

 IO 

 750 mA

5.0 mA 

 IO 

 1.0 A

Regload

46

17

35

150

75

150

mV

Output Voltage

–14.8 Vdc 

 VI 

 – 27 Vdc, 5.0 mA 

 IO 

 1.0 A, P 

 15 W

VO

–11.5

–12.5

Vdc

Input Bias Current

IIB

4.4

8.0

mA

Input Bias Current Change

–15 Vdc 

 VI 

 – 30 Vdc

5.0 mA 

 IO 

 1.0 A

5.0 mA 

 IO 

 1.5 A, TJ = +25

°

C

IIB

0.8

0.5

0.5

mA

Output Noise Voltage (TA = +25

°

C, 10 Hz 

 f 

 100 kHz)

Vn

75

µ

V

Ripple Rejection (IO = 20 mA, f = 120 Hz)

RR

61

dB

Dropout Voltage

IO = 1.0 A, TJ = +25

°

C

VI–VO

2.0

Vdc

Average Temperature Coefficient of Output Voltage

IO = 5.0 A, 0

°

 TJ 

 +125

°

C

VO/

T

–1.0

mV/

°

C

NOTE: 1. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. 

NOTE: 1.

Pulse testing with low duty cycle is used.

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MC7900

6

MOTOROLA ANALOG IC DEVICE DATA

MC7915C 

ELECTRICAL CHARACTERISTICS 

(VI = – 23 V, IO = 500 mA, 0

°

C < TJ < +125

°

C, unless otherwise noted.)

Characteristics

Symbol

Min

Typ

Max

Unit

Output Voltage (TJ = +25

°

C)

VO

–14.4

–15

–15.6

Vdc

Line Regulation (Note 1)

(TJ = +25

°

C, IO = 100 mA)

–17.5 Vdc 

 VI 

 – 30 Vdc

–20 Vdc 

 VI 

 – 26 Vdc

(TJ = +25

°

C, IO = 500 mA)

–17.5 Vdc 

 VI 

 – 30 Vdc

–20 Vdc 

 VI 

 – 26 Vdc

Regline

14

6.0

57

27

150

75

300

150

mV

Load Regulation, TJ = +25

°

C (Note 1)

5.0 mA 

 IO 

 1.5 A

250 mA 

 IO 

 750 mA

Regload

68

25

300

150

mV

Output Voltage

–17.5 Vdc 

 VI 

 – 30 Vdc, 5.0 mA 

 IO 

 1.0 A, P 

 15 W

VO

–14.25

–15.75

Vdc

Input Bias Current (TJ = +25

°

C)

IIB

4.4

8.0

mA

Input Bias Current Change

–17.5 Vdc 

 VI 

 – 30 Vdc

5.0 mA 

 IO 

 1.5 A

IIB

1.0

0.5

mA

Output Noise Voltage (TA = +25

°

C, 10 Hz 

 f 

 100 kHz)

Vn

90

µ

V

Ripple Rejection (IO = 20 mA, f = 120 Hz)

RR

60

dB

Dropout Voltage

IO = 1.0 A, TJ = +25

°

C

VI–VO

2.0

Vdc

Average Temperature Coefficient of Output Voltage

IO = 5.0 A, 0

°

 TJ 

 +125

°

C

VO/

T

–1.0

mV/

°

C

MC7915AC 

ELECTRICAL CHARACTERISTICS 

(VI = – 23 V, IO = 500 mA, 0

°

C < TJ < +125

°

C, unless otherwise noted.)

Characteristics

Symbol

Min

Typ

Max

Unit

Output Voltage (TJ = +25

°

C)

VO

–14.7

–15

–15.3

Vdc

Line Regulation (Note 1)

– 20 Vdc 

 VI 

 – 26 Vdc, IO = 1.0 A, TJ = +25

°

C

– 20 Vdc 

 VI 

 – 26 Vdc, IO = 1.0 A,

–17.9 Vdc 

 VI 

 – 30 Vdc, IO = 500 mA

–17.5 Vdc 

 VI 

 – 30 Vdc, IO = 1.0 A, TJ = +25

°

C

Regline

27

57

57

57

75

150

150

150

mV

Load Regulation (Note 1)

5.0 mA 

 IO 

 1.5 A, TJ = +25

°

C

250 mA 

 IO 

 750 mA

5.0 mA 

 IO 

 1.0 A

Regload

68

25

40

150

75

150

mV

Output Voltage

–17.9 Vdc 

 VI 

 – 30 Vdc, 5.0 mA 

 IO 

 1.0 A, P 

 15 W

VO

–14.4

–15.6

Vdc

Input Bias Current

IIB

4.4

8.0

mA

Input Bias Current Change

–17.5 Vdc 

 VI 

 – 30 Vdc

5.0 mA 

 IO 

 1.0 A

5.0 mA 

 IO 

 1.5 A, TJ = +25

°

C

IIB

0.8

0.5

0.5

mA

Output Noise Voltage (TA = +25

°

C, 10 Hz 

 f 

 100 kHz)

Vn

90

µ

V

Ripple Rejection (IO = 20 mA, f = 120 Hz)

RR

60

dB

Dropout Voltage

IO = 1.0 A, TJ = +25

°

C

VI–VO

2.0

Vdc

Average Temperature Coefficient of Output Voltage

IO = 5.0 mA, 0

°

 TJ 

 +125

°

C

VO/

T

–1.0

mV/

°

C

NOTE: 1. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. 

NOTE: 1.

Pulse testing with low duty cycle is used.

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MC7900

7

MOTOROLA ANALOG IC DEVICE DATA

MC7918C 

ELECTRICAL CHARACTERISTICS 

(VI = – 27 V, IO = 500 mA, 0

°

C < TJ < +125

°

C, unless otherwise noted.)

Characteristics

Symbol

Min

Typ

Max

Unit

Output Voltage (TJ = +25

°

C)

VO

–17.3

–18

–18.7

Vdc

Line Regulation (Note 1)

(TJ = +25

°

C, IO = 100 mA)

–21 Vdc 

 VI 

 – 33 Vdc

–24 Vdc 

 VI 

 – 30 Vdc

(TJ = +25

°

C, IO = 500 mA)

–21 Vdc 

 VI 

 – 33 Vdc

–24 Vdc 

 VI 

 – 30 Vdc

Regline

25

10

90

50

180

90

360

180

mV

Load Regulation, TJ = +25

°

C (Note 1)

5.0 mA 

 IO 

 1.5 A

250 mA 

 IO 

 750 mA

Regload

110

55

360

180

mV

Output Voltage

– 21 Vdc 

 VI 

 – 33 Vdc, 5.0 mA 

 IO 

 1.0 A, P 

 15 W

VO

–17.1

–18.9

Vdc

Input Bias Current (TJ = +25

°

C)

IIB

4.5

8.0

mA

Input Bias Current Change

–21 Vdc 

 VI 

 – 33 Vdc

5.0 mA 

 IO 

 1.5 A

IIB

1.0

0.5

mA

Output Noise Voltage (TA = +25

°

C, 10 Hz 

 f 

 100 kHz)

Vn

110

µ

V

Ripple Rejection (IO = 20 mA, f = 120 Hz)

RR

59

dB

Dropout Voltage

IO = 1.0 A, TJ = +25

°

C

VI–VO

2.0

Vdc

Average Temperature Coefficient of Output Voltage

IO = 5.0 mA, 0

°

 TJ 

 +125

°

C

VO/

T

–1.0

mV/

°

C

MC7924C 

ELECTRICAL CHARACTERISTICS 

(VI = – 33 V, IO = 500 mA, 0

°

C < TJ < +125

°

C, unless otherwise noted.)

Characteristics

Symbol

Min

Typ

Max

Unit

Output Voltage (TJ = +25

°

C)

VO

– 23

– 24

– 25

Vdc

Line Regulation (Note 1)

(TJ = +25

°

C, IO = 100 mA)

– 27 Vdc 

 VI 

 – 38 Vdc

– 30 Vdc 

 VI 

 – 36 Vdc

(TJ = +25

°

C, IO = 500 mA)

– 27 Vdc 

 VI 

 – 38 Vdc

– 30 Vdc 

 VI 

 – 36 Vdc

Regline

31

14

118

70

240

120

470

240

mV

Load Regulation, TJ = +25

°

C (Note 1)

5.0 mA 

 IO 

 1.5 A

250 mA 

 IO 

 750 mA

Regload

150

85

480

240

mV

Output Voltage

– 27 Vdc 

 VI 

 – 38 Vdc, 5.0 mA 

 IO 

 1.0 A, P 

 15 W

VO

– 22.8

– 25.2

Vdc

Input Bias Current (TJ = +25

°

C)

IIB

4.6

8.0

mA

Input Bias Current Change

– 27 Vdc 

 VI 

 – 38 Vdc

5.0 mA 

 IO 

 1.5 A

IIB

1.0

0.5

mA

Output Noise Voltage (TA = +25

°

C, 10 Hz 

 f 

 100 kHz)

Vn

170

µ

V

Ripple Rejection (IO = 20 mA, f = 120 Hz)

RR

56

dB

Dropout Voltage

IO = 1.0 A, TJ = +25

°

C

VI–VO

2.0

Vdc

Average Temperature Coefficient of Output Voltage

IO = 5.0 mA, 0

°

 TJ 

 +125

°

C

VO/

T

–1.0

mV/

°

C

NOTE: 1. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. 

NOTE: 1.

Pulse testing with low duty cycle is used.

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MC7900

8

MOTOROLA ANALOG IC DEVICE DATA

Figure 1. Worst Case Power Dissipation as a

Function of Ambient Temperature

Figure 2. Peak Output Current as a Function

of Input–Output Differential Voltage

Figure 3. Ripple Rejection as a

Function of Frequency

Figure 4. Ripple Rejection as a Function

of Output Voltage

Figure 5. Output Voltage as a Function

of Junction Temperature

Figure 6. Quiescent Current as a

Function of Temperature

, POWER DISSIP

A

TION (W)

D

P

Infinite Heatsink

θ

HS = 5

°

C/W

θ

HS = 15

°

C/W

No Heatsink

θ

JC = 5

°

C/W

θ

JA = 65

°

C/W

PD(max) = 15W

, OUTPUT

 CURRENT

 (A)

OI

RR, RIPPLE REJECTION (dB)

Vin = –11 V

VO = – 6.0 V

IO = 20 mA

RR, RIPPLE REJECTION (dB)

f = 120 Hz

IO = 20 mA

Vin = 1.0 V(RMS)

, OUTPUT

 VOL

TAGE 

(–V)

O

V

Vin = –11 V

VD = – 6.0 V

IO = 20 mA

, INPUT

 BIAS CURRENT

 (mA)

IBI

Vin = –11 V 

VO = – 6.0 V

IO = 20 mA

TJ = +25

°

C

20

10

5.0

4.0

3.0

2.0

1.0

0.5

0.4

0.3

0.2

0.1

2.5

2.0

1.5

1.0

0.5

0

100

80

60

40

20

80

70

60

50

40

6.26

6.22

6.18

6.14

6.10

6.06

5.2

5.0

4.8

4.6

4.4

4.2

25

50

75

100

125

150

TA, AMBIENT TEMPERATURE (

°

C)

0

3.0

6.0

9.0

12

15

18

21

24

27

30

|VI –VO| INPUT–OUTPUT VOLTAGE DIFFERENTIAL (V)

10

100

1.0 k

10 k

100 k

f, FREQUENCY (Hz)

2.0

4.0

6.0

8.0

10

12

14

16

18

20

22

VO, OUTPUT VOLTAGE (V)

–25

0

25

50

75

100

125

150

175

TJ, JUNCTION TEMPERATURE (

°

C)

0

25

50

75

100

125

TJ, JUNCTION TEMPERATURE (

°

C)

0

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MC7900

9

MOTOROLA ANALOG IC DEVICE DATA

APPLICATIONS INFORMATION

Design Considerations

The MC7900 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 

µ

F or larger tantalum, mylar,

or other capacitor having low internal impedance at high

frequencies should be chosen. The capacitor chosen should

have an equivalent series resistance of less than 0.7 

. 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. Bypassing the output is

also recommended.

Figure 7. Current Regulator

The MC7905, – 5.0 V regulator can be used as a constant current source when

connected as above. The output current is the sum of resistor R current and

quiescent bias current as follows.

The quiescent current for this regulator is typically 4.3 mA. The 5.0 V regulator was

chosen to minimize dissipation and to allow the output voltage to operate to within

6.0 V below the input voltage.

IO =

5.0 V

+ IB

–20 V

Input

MC7905

10

R

IO = 200 mA

VO 

 10 V

1.0 

µ

F

Gnd

Gnd

+

1.0 

µ

F

+

R

Figure 8. Current Boost Regulator

(– 5.0 V @ 4.0 A, with 5.0 A Current Limiting)

When a boost transistor is used, short circuit currents are equal to the sum of the

series pass and regulator limits, which are measured at 3.2 A and 1.8 A respectively

in this case. Series pass limiting is approximately equal to 0.6 V/RSC. Operation

beyond this point to the peak current capability of the MC7905C is possible if the

regulator is mounted on a heatsink; otherwise thermal shutdown will occur when

the additional load current is picked up by the regulator.

*Mounted on heatsink.

–10

V

Input

0.56

0.56

0.56

MJE200*

or Equiv

5.6

2N3055* 

or Equiv

MC7905*

1.0 

µ

F

– 5.0 V

Output

Gnd

Gnd

+

+

1.0 

µ

F

10 

µ

F

+

Figure 9. Operational Amplifier Supply

(

±

15 @ 1.0 A)

The MC7815 and MC7915 positive and negative regulators may be connected as

shown to obtain a dual power supply for operational amplifiers. A clamp diode

should be used at the output of the MC7815 to prevent potential latch–up problems

whenever the output of the positive regulator (MC7815) is drawn below ground with

an output current greater than 200 mA.

+20 V

Input

+15 V 

Output

0.33 

µ

F

1N4001

or Equiv

Gnd

Gnd

1.0 

µ

F

+

– 20 V

Input

–15 V 

Output

MC7815

MC7915

+

+

+

1.0 

µ

F

1.0 

µ

F

1.0 

µ

F

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MC7900

10

MOTOROLA ANALOG IC DEVICE DATA

Figure 10. D2PAK Thermal Resistance and Maximum

Power Dissipation versus P.C.B. Copper Length

R

, THERMAL

 RESIST

ANCE

JA

θ

JUNCTION-T

O-AIR (  C/W)

°

PD(max) for TA = +50

°

C

ÎÎÎ

ÎÎÎ

ÎÎÎ

ÎÎÎ

P

D

, MAXIMUM POWER DISSIP

A

TION (W)

30

40

50

60

70

80

0

10

20

30

25

15

5.0

L, LENGTH OF COPPER (mm)

Minimum

Size Pad

2.0 oz. Copper

L

L

Free Air

Mounted

Vertically

R

θ

JA

1.0

1.5

2.0

2.5

3.0

3.5

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.

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MC7900

11

MOTOROLA ANALOG IC DEVICE DATA

T SUFFIX

PLASTIC PACKAGE

CASE 221A–06

ISSUE Y

OUTLINE DIMENSIONS

MIN

MIN

MAX

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

C

S

T

U

J

R

F

B

Q

H

Z

L

V

G

N

D

K

A

4

1 2 3

D2T SUFFIX

PLASTIC PACKAGE

CASE 936–03

(D2PAK)

ISSUE B

5   REF

5   REF

A

1

2

3

K

F

B

J

S

H

0.010 (0.254)

T

M

D

G

C

E

–T

M

L

P

N

R

V

U

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.

DIM

A

MIN

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

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MC7900

12

MOTOROLA ANALOG IC DEVICE DATA

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.  “Typical” 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”

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.

How to reach us:

USA / EUROPE / Locations Not Listed: Motorola Literature Distribution;

JAPAN: Nippon Motorola Ltd.; Tatsumi–SPD–JLDC, 6F Seibu–Butsuryu–Center,

P.O. Box 20912; Phoenix, Arizona 85036. 1–800–441–2447 or 602–303–5454

3–14–2 Tatsumi Koto–Ku, Tokyo 135, Japan.  03–81–3521–8315

MFAX: RMFAX0@email.sps.mot.com – TOUCHTONE 602–244–6609

ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 

INTERNET: http://Design–NET.com

51 Ting Kok Road, Tai Po, N.T., Hong Kong.  852–26629298

MC7900/D

*MC7900/D*