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
FCO**
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
12
3
12
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
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%
T0°125°C
Surface Mount
MC79XXCD2T 4%
TJ=0
°
to +125
°
C
Surface
Mount
MC79XXACT 2%
T
J =
0°
to
+
125°C
Insertion Mount
MC79XXCT 4%
I
nser
ti
on
M
oun
t
MC79XXBD2T
4%
TJ=
–
40
°
to +125
°
C
Surface Mount
MC79XXBT
4%
T
J = –
40°
to
+
125°C
Insertion Mount
XX indicates nominal voltage.
Motorola, Inc. 1996 Rev 6
MC7900
2MOTOROLA 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 PDInternally Limited W
Thermal Resistance, Junction–to–Ambient θJA 65 °C/W
Thermal Resistance, Junction–to–Case θJC 5.0 °C/W
Case 936 (D2PAK)
TA = +25°C PDInternally Limited W
Thermal Resistance, Junction–to–Ambient θJA 70 °C/W
Thermal Resistance, Junction–to–Case θJC 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 RθJA 65 °C/W
Thermal Resistance, Junction–to–Case RθJC 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 – µV
Ripple Rejection (IO = 20 mA, f = 120 Hz) RR – 70 – dB
Dropout Voltage
IO = 1.0 A, TJ = +25°CVI–VO– 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 ef fects 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 – µV
Ripple Rejection (IO = mA, f = 120 Hz) RR – 70 – dB
Dropout Voltage
IO = 1.0 A. TJ = +25°CVI–VO– 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 – µV
Ripple Rejection (IO = 20 mA, f = 120 Hz) RR – 68 – dB
Dropout Voltage
IO = 1.0 A, TJ = +25°CVI–VO– 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 ef fects must be taken into account separately.
NOTE: 1. Pulse testing with low duty cycle is used.
MC7900
4MOTOROLA 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 – µV
Ripple Rejection (IO = 20 mA, f = 120 Hz) RR – 65 – dB
Dropout Voltage
IO = 1.0 A, TJ = +25°CVI–VO– 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 – µV
Ripple Rejection (IO = 20 mA, f = 120 Hz) RR – 62 – dB
Dropout Voltage
IO = 1.0 A, TJ = +25°CVI–VO– 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 ef fects 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 – µV
Ripple Rejection (IO = 20 mA, f = 120 Hz) RR – 61 – dB
Dropout Voltage
IO = 1.0 A, TJ = +25°CVI–VO– 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 – µV
Ripple Rejection (IO = 20 mA, f = 120 Hz) RR – 61 – dB
Dropout Voltage
IO = 1.0 A, TJ = +25°CVI–VO– 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 ef fects must be taken into account separately.
NOTE: 1. Pulse testing with low duty cycle is used.
MC7900
6MOTOROLA 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 – µV
Ripple Rejection (IO = 20 mA, f = 120 Hz) RR – 60 – dB
Dropout Voltage
IO = 1.0 A, TJ = +25°CVI–VO– 2.0 – Vdc
Average Temperature Coefficient of Output Voltage
IO = 5.0 A, 0°C ≤ 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 – µV
Ripple Rejection (IO = 20 mA, f = 120 Hz) RR – 60 – dB
Dropout Voltage
IO = 1.0 A, TJ = +25°CVI–VO– 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 ef fects must be taken into account separately.
NOTE: 1. Pulse testing with low duty cycle is used.
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 – µV
Ripple Rejection (IO = 20 mA, f = 120 Hz) RR – 59 – dB
Dropout Voltage
IO = 1.0 A, TJ = +25°CVI–VO– 2.0 – Vdc
Average Temperature Coefficient of Output Voltage
IO = 5.0 mA, 0°C ≤ 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 – µV
Ripple Rejection (IO = 20 mA, f = 120 Hz) RR – 56 – dB
Dropout Voltage
IO = 1.0 A, TJ = +25°CVI–VO– 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 ef fects must be taken into account separately.
NOTE: 1. Pulse testing with low duty cycle is used.
MC7900
8MOTOROLA 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 DISSIPATION (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)
O
I
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 VOLTAGE (–V)
O
V
Vin = –11 V
VD = –6.0 V
IO = 20 mA
, INPUT BIAS CURRENT (mA)
IB
I
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
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 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
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
F1N4001
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
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
PD, MAXIMUM POWER DISSIPATION (W)
30
40
50
60
70
80
010203025155.0
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.
MC7900
11
MOTOROLA ANALOG IC DEVICE DATA
T SUFFIX
PLASTIC PACKAGE
CASE 221A–06
ISSUE Y
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
CS
T
U
J
R
F
B
Q
H
Z
L
V
G
ND
K
A
4
123
D2T SUFFIX
PLASTIC PACKAGE
CASE 936–03
(D2PAK)
ISSUE B
5 REF5 REF
A
12 3
K
F
B
J
S
H
0.010 (0.254) T
M
D
G
C
E
–T
–
MLP
NR
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
AMIN MAX MIN MAX
MILLIMETERS
0.386 0.403 9.804 10.236
INCHES
B0.356 0.368 9.042 9.347
C0.170 0.180 4.318 4.572
D0.026 0.036 0.660 0.914
E0.045 0.055 1.143 1.397
F0.051 REF 1.295 REF
G0.100 BSC 2.540 BSC
H0.539 0.579 13.691 14.707
J0.125 MAX 3.175 MAX
K0.050 REF 1.270 REF
L0.000 0.010 0.000 0.254
M0.088 0.102 2.235 2.591
N0.018 0.026 0.457 0.660
P0.058 0.078 1.473 1.981
R
S0.116 REF 2.946 REF
U0.200 MIN 5.080 MIN
V0.250 MIN 6.350 MIN
__
OPTIONAL
CHAMFER
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/Af firmative Action Employer.
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MC7900/D
*MC7900/D*
◊
