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
THREETERMINAL
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 sevenvoltage 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 safearea
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 SafeArea 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
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, JunctiontoAmbient
JA
65
°
C/W
Thermal Resistance, JunctiontoCase
JC
5.0
°
C/W
Case 936 (D2PAK)
TA = +25
°
C
PD
Internally Limited
W
Thermal Resistance, JunctiontoAmbient
JA
70
°
C/W
Thermal Resistance, JunctiontoCase
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, JunctiontoAmbient
R
JA
65
°
C/W
Thermal Resistance, JunctiontoCase
R
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
VIVO
2.0
Vdc
Average Temperature Coefficient of Output Voltage
IO = 5.0 mA, 0
°
C
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.
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
VIVO
2.0
Vdc
Average Temperature Coefficient of Output Voltage
IO = 5.0 A, 0
°
C
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
VIVO
2.0
Vdc
Average Temperature Coefficient of Output Voltage
IO = 5.0 mA, 0
°
C
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.
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
VIVO
2.0
Vdc
Average Temperature Coefficient of Output Voltage
IO = 5.0 A, 0
°
C
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
VIVO
2.0
Vdc
Average Temperature Coefficient of Output Voltage
IO = 5.0 mA, 0
°
C
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.
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
VIVO
2.0
Vdc
Average Temperature Coefficient of Output Voltage
IO = 5.0 mA, 0
°
C
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
VIVO
2.0
Vdc
Average Temperature Coefficient of Output Voltage
IO = 5.0 A, 0
°
C
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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