Order this document by MC7900/D
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
MC7900
Series
THREE–TERMINAL
NEGATIVE FIXED
VOLTAGE REGULATORS
•
•
•
•
T SUFFIX
PLASTIC PACKAGE
CASE 221A
Heatsink surface
connected to Pin 2.
1
2
3
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
14.7 k
2.4 k
2.0 k
2.0 k
8.0 k
1.0 k
4.0 k
12 k
1.0 k
1.6 k
R2
4.0 k
R1
Pin 1. Ground
2. Input
3. Output
D2T SUFFIX
PLASTIC PACKAGE
CASE 936
(D2PAK)
25
3.6 k
1.2 k
1
2
3
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
10 k
20 pF
10 pF
2.0 k
1.1 k
750
20 k
20 k
10 k
240
VO
STANDARD APPLICATION
MC79XX
Input
Cin*
0.33
µF
0.3
Output
CO**
1.0
µF
This device contains 26 active transistors.
VI
ORDERING INFORMATION
Device
MC79XXACD2T
MC79XXCD2T
MC79XXACT
MC79XXCT
MC79XXBD2T
4%
MC79XXBT
XX indicates nominal voltage.
TJ = – 40° to +125°C
Output Voltage
Tolerance
2%
Surface Mount
4%
2%
4%
TJ = 0° to +125°C
125°C
Insertion Mount
Surface Mount
Insertion Mount
Operating
Temperature Range
Package
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.
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.
** CO improve stability and transient response.
DEVICE TYPE/NOMINAL OUTPUT VOLTAGE
MC7905
MC7905.2
MC7906
MC7908
©
Motorola, Inc. 1996
5.0 V
5.2 V
6.0 V
8.0 V
MC7912
MC7915
MC7918
MC7924
12 V
15 V
28 V
24 V
Rev 6
MOTOROLA ANALOG IC DEVICE DATA
1
MC7900
MAXIMUM RATINGS
(TA = +25°C, unless otherwise noted.)
Rating
Input Voltage (– 5.0 V
≥
VO
≥
–18 V)
Input Voltage
(24 V)
Power Dissipation
Case 221A
TA = +25°C
Thermal Resistance, Junction–to–Ambient
Thermal Resistance, Junction–to–Case
Case 936 (D2PAK)
TA = +25°C
Thermal Resistance, Junction–to–Ambient
Thermal Resistance, Junction–to–Case
Storage Junction Temperature Range
Junction Temperature
Symbol
VI
Value
– 35
– 40
Unit
Vdc
PD
θ
JA
θ
JC
PD
θ
JA
θ
JC
Tstg
TJ
Internally Limited
65
5.0
Internally Limited
70
5.0
– 65 to +150
+150
W
°C/W
°C/W
W
°C/W
°C/W
°C
°C
THERMAL CHARACTERISTICS
Characteristics
Thermal Resistance, Junction–to–Ambient
Thermal Resistance, Junction–to–Case
Symbol
R
θJA
R
θJC
Max
65
5.0
Unit
°C/W
°C/W
MC7905C
ELECTRICAL CHARACTERISTICS
(VI = –10 V, IO = 500 mA, 0°C < TJ < +125°C, unless otherwise noted.)
Characteristics
Output Voltage (TJ = +25°C)
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)
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)
Ripple Rejection (IO = 20 mA, f = 120 Hz)
Dropout Voltage
IO = 1.0 A, TJ = +25°C
Average Temperature Coefficient of Output Voltage
IO = 5.0 mA, 0°C
≤
TJ
≤
+125°C
Symbol
VO
Regline
–
–
–
–
Regload
–
–
VO
– 4.75
IIB
∆I
IB
–
–
Vn
RR
VI–VO
–
∆V
O/∆T
–
–1.0
–
2.0
–
mV/°C
–
–
–
–
40
70
1.3
0.5
–
–
µV
dB
Vdc
–
–
4.3
– 5.25
8.0
mA
mA
11
4.0
100
50
Vdc
7.0
2.0
35
8.0
50
25
100
50
mV
Min
– 4.8
Typ
– 5.0
Max
– 5.2
Unit
Vdc
mV
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.
2
MOTOROLA ANALOG IC DEVICE DATA
MC7900
MC7905AC
ELECTRICAL CHARACTERISTICS
(VI = –10 V, IO = 500 mA, 0°C < TJ < +125°C, unless otherwise noted.)
Characteristics
Output Voltage (TJ = +25°C)
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
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)
Ripple Rejection (IO = mA, f = 120 Hz)
Dropout Voltage
IO = 1.0 A. TJ = +25°C
Average Temperature Coefficient of Output Voltage
IO = 5.0 A, 0°C
≤
TJ
≤
+125°C
Symbol
VO
Regline
–
–
–
–
Regload
–
–
–
VO
– 4.80
IIB
∆I
IB
–
–
–
Vn
RR
VI–VO
–
∆V
O/∆T
–
–1.0
–
2.0
–
mV/°C
–
–
–
–
–
40
70
1.3
0.5
0.5
–
–
µV
dB
Vdc
–
–
4.4
– 5.20
8.0
mA
mA
11
4.0
9.0
100
50
100
Vdc
2.0
7.0
7.0
6.0
25
50
50
50
mV
Min
– 4.9
Typ
– 5.0
Max
– 5.1
Unit
Vdc
mV
MC7905.2C
ELECTRICAL CHARACTERISTICS
(VI = –10 V, IO = 500 mA, 0°C < TJ < +125°C, unless otherwise noted.)
Characteristics
Output Voltage (TJ = +25°C)
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)
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)
Ripple Rejection (IO = 20 mA, f = 120 Hz)
Dropout Voltage
IO = 1.0 A, TJ = +25°C
Average Temperature Coefficient of Output Voltage
IO = 5.0 mA, 0°C
≤
TJ
≤
+125°C
Symbol
VO
Regline
–
–
–
–
Regload
–
–
VO
– 4.95
IIB
∆I
IB
–
–
Vn
RR
VI–VO
–
∆V
O/∆T
–
–1.0
–
2.0
–
mV/°C
–
–
–
–
42
68
1.3
0.5
–
–
µV
dB
Vdc
–
–
4.3
– 5.45
8.0
mA
mA
12
4.5
105
52
Vdc
8.0
2.2
37
8.5
52
27
105
52
mV
Min
– 5.0
Typ
– 5.2
Max
– 5.4
Unit
Vdc
mV
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.
MOTOROLA ANALOG IC DEVICE DATA
3
MC7900
MC7906C
ELECTRICAL CHARACTERISTICS
(VI = –11 V, IO = 500 mA, 0°C < TJ < +125°C, unless otherwise noted.)
Characteristics
Output Voltage (TJ = +25°C)
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)
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)
Ripple Rejection (IO = 20 mA, f = 120 Hz)
Dropout Voltage
IO = 1.0 A, TJ = +25°C
Average Temperature Coefficient of Output Voltage
IO = 5.0 A, 0°C
≤
TJ
≤
+125°C
Symbol
VO
Regline
–
–
–
–
Regload
–
–
VO
– 5.7
IIB
∆I
IB
–
–
Vn
RR
VI–VO
–
∆V
O/∆T
–
–1.0
–
2.0
–
mV/°C
–
–
–
–
45
65
1.3
0.5
–
–
µV
dB
Vdc
–
–
4.3
– 6.3
8.0
mA
mA
13
5.0
120
60
Vdc
9.0
3.0
43
10
60
30
120
60
mV
Min
– 5.75
Typ
– 6.0
Max
– 6.25
Unit
Vdc
mV
MC7908C
ELECTRICAL CHARACTERISTICS
(VI = –14 V, IO = 500 mA, 0°C < TJ < +125°C, unless otherwise noted.)
Characteristics
Output Voltage (TJ = +25°C)
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)
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)
Ripple Rejection (IO = 20 mA, f = 120 Hz)
Dropout Voltage
IO = 1.0 A, TJ = +25°C
Average Temperature Coefficient of Output Voltage
IO = 5.0 mA, 0°C
≤
TJ
≤
+125°C
Symbol
VO
Regline
–
–
–
–
Regload
–
–
VO
–7.6
IIB
∆I
IB
–
–
Vn
RR
VI–VO
–
∆V
O/∆T
–
–1.0
–
2.0
–
mV/°C
–
–
–
–
52
62
1.0
0.5
–
–
µV
dB
Vdc
–
–
4.3
– 8.4
8.0
mA
mA
26
9.0
160
80
Vdc
12
5.0
50
22
80
40
160
80
mV
Min
–7.7
Typ
– 8.0
Max
– 8.3
Unit
Vdc
mV
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.
4
MOTOROLA ANALOG IC DEVICE DATA
MC7900
MC7912C
ELECTRICAL CHARACTERISTICS
(VI = –19 V, IO = 500 mA, 0°C < TJ < +125°C, unless otherwise noted.)
Characteristics
Output Voltage (TJ = +25°C)
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)
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)
Ripple Rejection (IO = 20 mA, f = 120 Hz)
Dropout Voltage
IO = 1.0 A, TJ = +25°C
Average Temperature Coefficient of Output Voltage
IO = 5.0 mA, 0°C
≤
TJ
≤
+125°C
Symbol
VO
Regline
–
–
–
–
Regload
–
–
VO
–11.4
IIB
∆I
IB
–
–
Vn
RR
VI–VO
–
∆V
O/∆T
–
–1.0
–
2.0
–
mV/°C
–
–
–
–
75
61
1.0
0.5
–
–
µV
dB
Vdc
–
–
4.4
–12.6
8.0
mA
mA
46
17
240
120
Vdc
13
6.0
55
24
120
60
240
120
mV
Min
–11.5
Typ
–12
Max
–12.5
Unit
Vdc
mV
MC7912AC
ELECTRICAL CHARACTERISTICS
(VI = –19 V, IO = 500 mA, 0°C < TJ < +125°C, unless otherwise noted.)
Characteristics
Output Voltage (TJ = +25°C)
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
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)
Ripple Rejection (IO = 20 mA, f = 120 Hz)
Dropout Voltage
IO = 1.0 A, TJ = +25°C
Average Temperature Coefficient of Output Voltage
IO = 5.0 A, 0°C
≤
TJ
≤
+125°C
Symbol
VO
Regline
–
–
–
–
Regload
–
–
–
VO
–11.5
IIB
∆I
IB
–
–
–
Vn
RR
VI–VO
–
∆V
O/∆T
–
–1.0
–
2.0
–
mV/°C
–
–
–
–
–
75
61
0.8
0.5
0.5
–
–
µV
dB
Vdc
–
–
4.4
–12.5
8.0
mA
mA
46
17
35
150
75
150
Vdc
6.0
24
24
13
60
120
120
120
mV
Min
–11.75
Typ
–12
Max
–12.25
Unit
Vdc
mV
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.
MOTOROLA ANALOG IC DEVICE DATA
5
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