Datasheet MC7912CD2T, MC7912BD2T, MC7912BT, MC7918BT, MC7918CD2T Datasheet (Motorola)

 

Surface Mount

T

125°C

I

t

4%

T

40° to +125°C

 

Order this document by MC7900/D





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)

3.6 k

1.2 k

Representative Schematic Diagram

2.4 k

14.7 k

25

4.0 k

12 k

1.0 k

2.0 k

2.0 k

8.0 k

1.0 k

1.6 k

4.0 k

Gnd

R

1

R

2

THREE–TERMINAL

NEGATIVE FIXED

VOLTAGE REGULATORS

T SUFFIX

PLASTIC PACKAGE

CASE 221A

Heatsink surface

connected to Pin 2.

1

2

3

Pin 1. Ground

2. Input

3. Output

D2T SUFFIX

PLASTIC PACKAGE

CASE 936

(D2PAK)

Heatsink surface (shown as terminal 4 in

case outline drawing) is connected to Pin 2.

2

1

3

1.1 k

This device contains 26 active transistors.

ORDERING INFORMATION

Output Voltage

Device

MC79XXACD2T 2%
MC79XXCD2T 4%
MC79XXACT 2%
MC79XXCT 4%
MC79XXBD2T
MC79XXBT

XX indicates nominal voltage.

Tolerance

2.0 k

20 pF

20 k 20 k

Operating

Temperature Range

= 0° to +

J

–

= –

J

°

°

°

°

10 k

10 pF

10 k

240

nsertion Moun

Surface Mount

Insertion Mount

750

Package

V

0.3

O

V

I

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.

XX,

STANDARD APPLICATION

Input

Cin*

0.33

µ

F

A common ground is required between the input

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

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

CO**

1.0

Output

µ

F

12 V
15 V
28 V
24 V

MOTOROLA ANALOG IC DEVICE DATA

 Motorola, Inc. 1996 Rev 6

1

MC7900

MAXIMUM RATINGS (T

Rating Symbol Value Unit

Input Voltage (–5.0 V ≥ VO ≥ –18 V)

Input Voltage (24 V)

Power Dissipation
Case 221A

TA = +25°C P
Thermal Resistance, Junction–to–Ambient θ
Thermal Resistance, Junction–to–Case θ

Case 936 (D2PAK)

TA = +25°C P
Thermal Resistance, Junction–to–Ambient θ

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

= +25°C, unless otherwise noted.)

A

V

I

D
JA
JC

D
JA
JC

stg

J

–35
–40

Internally Limited W

65 °C/W

5.0 °C/W

Internally Limited W

70 °C/W

5.0 °C/W

–65 to +150 °C

+150 °C

Vdc

THERMAL CHARACTERISTICS

Characteristics Symbol Max Unit

Thermal Resistance, Junction–to–Ambient R
Thermal Resistance, Junction–to–Case R

θJA
θJC

65 °C/W

5.0 °C/W

MC7905C
ELECTRICAL CHARACTERISTICS (V

Characteristics

Output Voltage (TJ = +25°C) V
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

Load Regulation, TJ = +25°C (Note 1)

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

Output Voltage

–7.0 Vdc ≥ VI ≥ –20 Vdc, 5.0 mA ≤ IO ≤ 1.0 A, P ≤ 15 W
Input Bias Current (TJ = +25°C) I
Input Bias Current Change

–7.0 Vdc ≥ VI ≥ –25 Vdc

5.0 mA ≤ IO ≤ 1.5 A
Output Noise Voltage (TA = +25°C, 10 Hz ≤ f ≤ 100 kHz) V
Ripple Rejection (IO = 20 mA, f = 120 Hz) RR – 70 – dB
Dropout Voltage

IO = 1.0 A, TJ = +25°C

Average Temperature Coef ficient of Output Voltage

IO = 5.0 mA, 0°C ≤ TJ ≤ +125°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.

= –10 V, IO = 500 mA, 0°C < TJ < +125°C, unless otherwise noted.)

I

Symbol Min Typ Max Unit

O

Reg

line

Reg

load

V

O

IB

∆I

IB

n

VI–V

∆VO/∆T

–4.8 –5.0 –5.2 Vdc

–
–

–
–

–
–

–4.75 – –5.25

– 4.3 8.0 mA

–
–

– 40 – µV

O

– 2.0 –

– –1.0 –

7.0

2.0

35

8.0

11

4.0

mV

50
25

100

50

100

50

–
–

1.3

0.5

mV

Vdc

mA

Vdc

mV/°C

2

MOTOROLA ANALOG IC DEVICE DATA

MC7900

MC7905AC
ELECTRICAL CHARACTERISTICS (V

Characteristics

Output Voltage (TJ = +25°C) V
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

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
Output Voltage

–7.5 Vdc ≥ VI ≥ –20 Vdc, 5.0 mA ≤ IO ≤ 1.0 A, P ≤ 15 W
Input Bias Current I
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
Output Noise Voltage (TA = +25°C, 10 Hz ≤ f ≤ 100 kHz) V
Ripple Rejection (IO = mA, f = 120 Hz) RR – 70 – dB
Dropout Voltage

IO = 1.0 A. TJ = +25°C

Average Temperature Coef ficient of Output Voltage

IO = 5.0 A, 0°C ≤ TJ ≤ +125°C

= –10 V, IO = 500 mA, 0°C < TJ < +125°C, unless otherwise noted.)

I

Symbol Min Typ Max Unit

O

Reg

line

Reg

load

V

O

IB

∆I

IB

n

VI–V

∆VO/∆T

–4.9 –5.0 –5.1 Vdc

–
–
–
–

–
–
–

–4.80 – –5.20

– 4.4 8.0 mA

–
–
–

– 40 – µV

O

– 2.0 –

– –1.0 –

2.0

7.0

7.0

6.0

11

4.0

9.0

25
50
50
50

100

50

100

–
–
–

1.3

0.5

0.5

mV/°C

mV

mV

Vdc

mA

Vdc

MC7905.2C
ELECTRICAL CHARACTERISTICS

Output Voltage (TJ = +25°C) V
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

Load Regulation, TJ = +25°C (Note 1)

5.0 mA ≤ IO ≤ 1.5 A

250 mA ≤ IO ≤ 750 mA

Output Voltage

–7.2 Vdc ≥ VI ≥ –20 Vdc, 5.0 mA ≤ IO ≤ 1.0 A, P ≤ 15 W
Input Bias Current (TJ = +25°C) I
Input Bias Current Change

–7.2 Vdc ≥ VI ≥ –25 Vdc

5.0 mA ≤ IO ≤ 1.5 A
Output Noise Voltage (TA = +25°C, 10 Hz ≤ f ≤ 100 kHz) V
Ripple Rejection (IO = 20 mA, f = 120 Hz) RR – 68 – dB
Dropout Voltage

IO = 1.0 A, TJ = +25°C

Average Temperature Coef ficient of Output Voltage

IO = 5.0 mA, 0°C ≤ TJ ≤ +125°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.

(VI = –10 V, IO = 500 mA, 0°C < TJ < +125°C, unless otherwise noted.)

Characteristics

Symbol Min Typ Max Unit

O

Reg

line

Reg

load

V

O

IB

∆I

IB

n

VI–V

O

∆VO/∆T

–5.0 –5.2 –5.4 Vdc

mV

–
–

–
–

–
–

–4.95 – –5.45

– 4.3 8.0 mA

–
–

– 42 – µV

– 2.0 –

– –1.0 –

8.0

2.2

37

8.5

12

4.5

52
27

105

52

105

52

–
–

1.3

0.5

mV

Vdc

mA

Vdc

mV/°C

MOTOROLA ANALOG IC DEVICE DATA

3

MC7900

MC7906C
ELECTRICAL CHARACTERISTICS

Output Voltage (TJ = +25°C) V
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

Load Regulation, TJ = +25°C (Note 1)

5.0 mA ≤ IO ≤ 1.5 A

250 mA ≤ IO ≤ 750 mA

Output Voltage

–8.0 Vdc ≥ VI ≥ –21 Vdc, 5.0 mA ≤ IO ≤ 1.0 A, P ≤ 15 W
Input Bias Current (TJ = +25°C) I
Input Bias Current Change

–8.0 Vdc ≥ VI ≥ –25 Vdc

5.0 mA ≤ IO ≤ 1.5 A
Output Noise Voltage (TA = +25°C, 10 Hz ≤ f ≤ 100 kHz) V
Ripple Rejection (IO = 20 mA, f = 120 Hz) RR – 65 – dB
Dropout Voltage

IO = 1.0 A, TJ = +25°C

Average Temperature Coef ficient of Output Voltage

IO = 5.0 A, 0°C ≤ TJ ≤ +125°C

(VI = –11 V, IO = 500 mA, 0°C < TJ < +125°C, unless otherwise noted.)

Characteristics

Symbol Min Typ Max Unit

O

Reg

line

Reg

load

V

O

IB

∆I

IB

n

VI–V

O

∆VO/∆T

–5.75 –6.0 –6.25 Vdc

–
–

–
–

–
–

–5.7 – –6.3

– 4.3 8.0 mA

–
–

– 45 – µV

– 2.0 –

– –1.0 –

9.0

3.0

43
10

13

5.0

60
30

120

60

120

60

–
–

1.3

0.5

mV/°C

mV

mV

Vdc

mA

Vdc

MC7908C
ELECTRICAL CHARACTERISTICS (V

Characteristics

Output Voltage (TJ = +25°C) V
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

Load Regulation, TJ = +25°C (Note 1)

5.0 mA ≤ IO ≤ 1.5 A

250 mA ≤ IO ≤ 750 mA

Output Voltage

–10.5 Vdc ≥ VI ≥ –23 Vdc, 5.0 mA ≤ IO ≤ 1.0 A, P ≤ 15 W
Input Bias Current (TJ = +25°C) I
Input Bias Current Change

–10.5 Vdc ≥ VI ≥ –25 Vdc

5.0 mA ≤ IO ≤ 1.5 A
Output Noise Voltage (TA = +25°C, 10 Hz ≤ f ≤ 100 kHz) V
Ripple Rejection (IO = 20 mA, f = 120 Hz) RR – 62 – dB
Dropout Voltage

IO = 1.0 A, TJ = +25°C

Average Temperature Coef ficient of Output Voltage

IO = 5.0 mA, 0°C ≤ TJ ≤ +125°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.

= –14 V, IO = 500 mA, 0°C < TJ < +125°C, unless otherwise noted.)

I

Symbol Min Typ Max Unit

O

Reg

line

Reg

load

V

O

IB

∆I

IB

n

VI–V

∆VO/∆T

–7.7 –8.0 –8.3 Vdc

–
–

–
–

–
–

–7.6 – –8.4

– 4.3 8.0 mA

–
–

– 52 – µV

O

– 2.0 –

– –1.0 –

12

5.0

50
22

26

9.0

mV

80
40

160

80

160

80

–
–

1.0

0.5

mV

Vdc

mA

Vdc

mV/°C

4

MOTOROLA ANALOG IC DEVICE DATA

MC7900

MC7912C
ELECTRICAL CHARACTERISTICS (V

Characteristics

Output Voltage (TJ = +25°C) V
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

Load Regulation, TJ = +25°C (Note 1)

5.0 mA ≤ IO ≤ 1.5 A

250 mA ≤ IO ≤ 750 mA

Output Voltage

–14.5 Vdc ≥ VI ≥ –27 Vdc, 5.0 mA ≤ IO ≤ 1.0 A, P ≤ 15 W
Input Bias Current (TJ = +25°C) I
Input Bias Current Change

–14.5 Vdc ≥ VI ≥ –30 Vdc

5.0 mA ≤ IO ≤ 1.5 A
Output Noise Voltage (TA = +25°C, 10 Hz ≤ f ≤ 100 kHz) V
Ripple Rejection (IO = 20 mA, f = 120 Hz) RR – 61 – dB
Dropout Voltage

IO = 1.0 A, TJ = +25°C

Average Temperature Coef ficient of Output Voltage

IO = 5.0 mA, 0°C ≤ TJ ≤ +125°C

= –19 V, IO = 500 mA, 0°C < TJ < +125°C, unless otherwise noted.)

I

Symbol Min Typ Max Unit

O

Reg

line

Reg

load

V

O

IB

∆I

IB

n

VI–V

∆VO/∆T

–11.5 –12 –12.5 Vdc

–
–

–
–

–
–

–11.4 – –12.6

– 4.4 8.0 mA

–
–

– 75 – µV

O

– 2.0 –

– –1.0 –

13

6.0

55
24

46
17

120

60

240
120

240
120

–
–

1.0

0.5

mV/°C

mV

mV

Vdc

mA

Vdc

MC7912AC
ELECTRICAL CHARACTERISTICS (V

Characteristics

Output Voltage (TJ = +25°C) V
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

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
Output Voltage

–14.8 Vdc ≥ VI ≥ –27 Vdc, 5.0 mA ≤ IO ≤ 1.0 A, P ≤ 15 W
Input Bias Current I
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
Output Noise Voltage (TA = +25°C, 10 Hz ≤ f ≤ 100 kHz) V
Ripple Rejection (IO = 20 mA, f = 120 Hz) RR – 61 – dB
Dropout Voltage

IO = 1.0 A, TJ = +25°C

Average Temperature Coef ficient of Output Voltage

IO = 5.0 A, 0°C ≤ TJ ≤ +125°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.

= –19 V, IO = 500 mA, 0°C < TJ < +125°C, unless otherwise noted.)

I

Symbol Min Typ Max Unit

O

Reg

Reg

load

V

O

IB

∆I

IB

VI–V

∆VO/∆T

–11.75 –12 –12.25 Vdc

line

n

O

–
–
–
–

–
–
–

–11.5 – –12.5

– 4.4 8.0 mA

–
–
–

– 75 – µV

– 2.0 –

– –1.0 –

6.0
24
24
13

46
17
35

60
120
120
120

150

75
150

–
–
–

0.8

0.5

0.5

mV

mV

Vdc

mA

Vdc

mV/°C

MOTOROLA ANALOG IC DEVICE DATA

5

MC7900

MC7915C
ELECTRICAL CHARACTERISTICS

Output Voltage (TJ = +25°C) V
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

Load Regulation, TJ = +25°C (Note 1)

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

Output Voltage

–17.5 Vdc ≥ VI ≥ –30 Vdc, 5.0 mA ≤ IO ≤ 1.0 A, P ≤ 15 W
Input Bias Current (TJ = +25°C) I
Input Bias Current Change

–17.5 Vdc ≥ VI ≥ –30 Vdc

5.0 mA ≤ IO ≤ 1.5 A
Output Noise Voltage (TA = +25°C, 10 Hz ≤ f ≤ 100 kHz) V
Ripple Rejection (IO = 20 mA, f = 120 Hz) RR – 60 – dB
Dropout Voltage

IO = 1.0 A, TJ = +25°C

Average Temperature Coef ficient of Output Voltage

IO = 5.0 A, 0°C ≤ TJ ≤ +125°C

(VI = –23 V , IO = 500 mA, 0°C < TJ < +125°C, unless otherwise noted.)

Characteristics

Symbol Min Typ Max Unit

O

Reg

line

Reg

load

V

O

IB

∆I

IB

n

VI–V

O

∆VO/∆T

–14.4 –15 –15.6 Vdc

–
–

–
–

–
–

–14.25 – –15.75

– 4.4 8.0 mA

–
–

– 90 – µV

– 2.0 –

– –1.0 –

14

6.0

57
27

68
25

150

75

300
150

300
150

–
–

1.0

0.5

mV/°C

mV

mV

Vdc

mA

Vdc

MC7915AC
ELECTRICAL CHARACTERISTICS (V

Characteristics

Output Voltage (TJ = +25°C) V
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

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
Output Voltage

–17.9 Vdc ≥ VI ≥ –30 Vdc, 5.0 mA ≤ IO ≤ 1.0 A, P ≤ 15 W
Input Bias Current I
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
Output Noise Voltage (TA = +25°C, 10 Hz ≤ f ≤ 100 kHz) V
Ripple Rejection (IO = 20 mA, f = 120 Hz) RR – 60 – dB
Dropout Voltage

IO = 1.0 A, TJ = +25°C

Average Temperature Coef ficient of Output Voltage

IO = 5.0 mA, 0°C ≤ TJ ≤ +125°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.

= –23 V , IO = 500 mA, 0°C < TJ < +125°C, unless otherwise noted.)

I

Symbol Min Typ Max Unit

O

Reg

line

Reg

load

V

O

IB

∆I

IB

n

VI–V

∆VO/∆T

–14.7 –15 –15.3 Vdc

–
–
–
–

–
–
–

–14.4 – –15.6

– 4.4 8.0 mA

–
–
–

– 90 – µV

O

– 2.0 –

– –1.0 –

27
57
57
57

68
25
40

75
150
150
150

150

75
150

–
–
–

0.8

0.5

0.5

mV

mV

Vdc

mA

Vdc

mV/°C

6

MOTOROLA ANALOG IC DEVICE DATA

MC7900

MC7918C
ELECTRICAL CHARACTERISTICS (V

Characteristics

Output Voltage (TJ = +25°C) V
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

Load Regulation, TJ = +25°C (Note 1)

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

Output Voltage

–21 Vdc ≥ VI ≥ –33 Vdc, 5.0 mA ≤ IO ≤ 1.0 A, P ≤ 15 W
Input Bias Current (TJ = +25°C) I
Input Bias Current Change

–21 Vdc ≥ VI ≥ –33 Vdc

5.0 mA ≤ IO ≤ 1.5 A
Output Noise Voltage (TA = +25°C, 10 Hz ≤ f ≤ 100 kHz) V
Ripple Rejection (IO = 20 mA, f = 120 Hz) RR – 59 – dB
Dropout Voltage

IO = 1.0 A, TJ = +25°C

Average Temperature Coef ficient of Output Voltage

IO = 5.0 mA, 0°C ≤ TJ ≤ +125°C

= –27 V , IO = 500 mA, 0°C < TJ < +125°C, unless otherwise noted.)

I

Symbol Min Typ Max Unit

O

Reg

line

Reg

load

V

O

IB

∆I

IB

n

VI–V

∆VO/∆T

–17.3 –18 –18.7 Vdc

–
–

–
–

–
–

–17.1 – –18.9

– 4.5 8.0 mA

–
–

– 110 – µV

O

– 2.0 –

– –1.0 –

25
10

90
50

110

55

180

90

360
180

360
180

–
–

1.0

0.5

mV/°C

mV

mV

Vdc

mA

Vdc

MC7924C
ELECTRICAL CHARACTERISTICS (V

Characteristics

Output Voltage (TJ = +25°C) V
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

Load Regulation, TJ = +25°C (Note 1)

5.0 mA ≤ IO ≤ 1.5 A

250 mA ≤ IO ≤ 750 mA

Output Voltage

–27 Vdc ≥ VI ≥ –38 Vdc, 5.0 mA ≤ IO ≤ 1.0 A, P ≤ 15 W
Input Bias Current (TJ = +25°C) I
Input Bias Current Change

–27 Vdc ≥ VI ≥ –38 Vdc

5.0 mA ≤ IO ≤ 1.5 A
Output Noise Voltage (TA = +25°C, 10 Hz ≤ f ≤ 100 kHz) V
Ripple Rejection (IO = 20 mA, f = 120 Hz) RR – 56 – dB
Dropout Voltage

IO = 1.0 A, TJ = +25°C

Average Temperature Coef ficient of Output Voltage

IO = 5.0 mA, 0°C ≤ TJ ≤ +125°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.

= –33 V , IO = 500 mA, 0°C < TJ < +125°C, unless otherwise noted.)

I

Symbol Min Typ Max Unit

O

Reg

line

Reg

load

V

O

IB

∆I

IB

n

VI–V

∆VO/∆T

–23 –24 –25 Vdc

–
–

–
–

–
–

–22.8 – –25.2

– 4.6 8.0 mA

–
–

– 170 – µV

O

– 2.0 –

– –1.0 –

31
14

118

70

150

85

–
–

mV

240
120

470
240

mV
480
240

Vdc

mA

1.0

0.5

Vdc

mV/°C

MOTOROLA ANALOG IC DEVICE DATA

7

MC7900

Figure 1. Worst Case Power Dissipation as a

Function of Ambient Temperature

20
10

θHS = 5°C/W

5.0

4.0

θ

°

C/W

= 15

HS

3.0

2.0
No Heatsink

1.0

0.5

0.4

, POWER DISSIPATION (W)

0.3

D

θJC = 5°C/W

P

0.2

θJA = 65°C/W

PD(max) = 15W

0.1

25 50 75 100 125 150

TA, AMBIENT TEMPERATURE (

Infinite Heatsink

°

C)

Figure 3. Ripple Rejection as a

Function of Frequency

100

80

60

40

Vin = –11 V
VO = –6.0 V
IO = 20 mA

Figure 2. Peak Output Current as a Function

of Input–Output Differential Voltage

2.5

2.0

1.5

1.0

, OUTPUT CURRENT (A)

O

I

0.5

0

0 3.0 6.0 9.0 12 15 18 21 24 27 30

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

TJ = +25°C

Figure 4. Ripple Rejection as a Function

of Output Voltage

80

f = 120 Hz

70

60

IO = 20 mA

∆

Vin = 1.0 V(RMS)

RR, RIPPLE REJECTION (dB)

20

0

10 100 1.0 k 10 k 100 k

f, FREQUENCY (Hz)

Figure 5. Output V oltage as a Function

of Junction T emperature

6.26

6.22

6.18

6.14

, OUTPUT VOL TAGE (–V)

O

V

6.10

6.06
–25 0 25 50 75 100 125 150 175

TJ, JUNCTION TEMPERATURE (

Vin = –11 V
VD = –6.0 V
IO = 20 mA

°

C)

50

RR, RIPPLE REJECTION (dB)

40

2.0 4.0 6.0 8.0 10 12 14 16 18 20 22
VO, OUTPUT VOLTAGE (V)

Figure 6. Quiescent Current as a

Function of Temperature

5.2

5.0

4.8

4.6

, INPUT BIAS CURRENT (mA)

4.4

IB

I

4.2
0 25 50 75 100 125

TJ, JUNCTION TEMPERATURE (°C)

Vin = –11 V
VO = –6.0 V
IO = 20 mA

8

MOTOROLA ANALOG IC DEVICE DATA

MC7900

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 µF 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 Ω. 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

–20 V
Input

Gnd Gnd

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.

1.0 µF

+

MC7905

5.0 V

IO =

+ I

R

10

1.0

+

B

R

µ

F

IO = 200 mA
–

≤

10 V

VO

Figure 8. Current Boost Regulator

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

–10

V

Input

10 µF

Gnd Gnd

*Mounted on heatsink.

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.

MJE200*
or Equiv

+

0.56

0.56

0.56

5.6
+

1.0

2N3055*
or Equiv

MC7905*

µ

F

–5.0 V
Output

µ

F

1.0

+

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.

Figure 9. Operational Amplifier Supply

(±15 @ 1.0 A)

+20 V

Input

0.33

Gnd

–20 V

Input

µ

F

+

+

1.0

1.0

µ

F

µ

F

MC7815

MC7915

1.0

1.0

+

µ

F

+

µ

F

+15 V
Output

1N4001
or Equiv

Gnd

–15 V

Output

MOTOROLA ANALOG IC DEVICE DATA

9

MC7900

ÎÎÎ

ÎÎÎ

ÎÎÎ

Figure 10. D2P AK Thermal Resistance and Maximum

Power Dissipation versus P.C.B. Copper Length

80

70

°

60

50

JA

JUNCTION-TO-AIR ( C/W)

θ

40

R , THERMAL RESIST ANCE

30

Free Air
Mounted
Vertically

010203025155.0
L, LENGTH OF COPPER (mm)

P

for TA = +50°C

D(max)

Minimum

Size Pad

R

θ

JA

DEFINITIONS

2.0 oz. Copper

L

3.5

3.0

L

2.5

2.0

1.5

1.0

, MAXIMUM POWER DISSIPATION (W)

D

P

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.

10

MOTOROLA ANALOG IC DEVICE DATA

MC7900

OUTLINE DIMENSIONS

T SUFFIX

PLASTIC PACKAGE

CASE 221A–06

ISSUE Y

NOTES:

1. DIMENSIONING AND TOLERANCING PER ANSI

SEATING

–T

PLANE

B

4

Q

123

F

T

A

U

–

C

S

H

K

Z

L

V

R

J

G

D

N

Y14.5M, 1982.

2. CONTROLLING DIMENSION: INCH.

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

INCHES MILLIMETERS

MIN MINMAX MAX

DIM

G
H
J
K
L
N
Q
R
S
T
U
V
Z

A
B
C
D
F

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

–

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

–

K

B

F

J

D

0.010 (0.254) T

M

C

A

12 3

G

S

H

OPTIONAL
CHAMFER

E

N

D2T SUFFIX

PLASTIC PACKAGE

CASE 936–03

(D2PAK)
ISSUE B

–T

–

TERMINAL 4

V

M

L

P

R

NOTES:

1 DIMENSIONING AND TOLERANCING PER ANSI

U

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.

INCHES

DIMAMIN MAX MIN MAX

0.386 0.403 9.804 10.236

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

MILLIMETERS

5 REF5 REF

MOTOROLA ANALOG IC DEVICE DATA

11

MC7900

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 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,

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INTERNET: http://Design–NET.com 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298

12

◊

MOTOROLA ANALOG IC DEVICE DATA

MC7900/D

*MC7900/D*