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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 F
0.3
Output CO** 1.0 F
This device contains 26 active transistors.
VI
ORDERING INFORMATION
Device MC79XXACD2T MC79XXCD2T MC79XXACT MC79XXCT MC79XXBD2T 4% MC79XXBT XX indicates nominal voltage. TJ = - 40 to +125C Output Voltage Tolerance 2% Surface Mount 4% 2% 4% TJ = 0 to +125C 125C 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
(c) 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 = +25C, unless otherwise noted.)
Rating Input Voltage (- 5.0 V VO -18 V) Input Voltage (24 V) Power Dissipation Case 221A TA = +25C Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-Case Case 936 (D2PAK) TA = +25C Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-Case Storage Junction Temperature Range Junction Temperature Symbol VI Value - 35 - 40 Unit Vdc
PD JA JC PD JA 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 RJA RJC Max 65 5.0 Unit C/W C/W
MC7905C ELECTRICAL CHARACTERISTICS (VI = -10 V, IO = 500 mA, 0C < TJ < +125C, unless otherwise noted.)
Characteristics Output Voltage (TJ = +25C) Line Regulation (Note 1) (TJ = +25C, IO = 100 mA) -7.0 Vdc VI - 25 Vdc - 8.0 Vdc VI -12 Vdc (TJ = +25C, IO = 500 mA) -7.0 Vdc VI - 25 Vdc - 8.0 Vdc VI -12 Vdc Load Regulation, TJ = +25C (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 = +25C) Input Bias Current Change -7.0 Vdc VI - 25 Vdc 5.0 mA IO 1.5 A Output Noise Voltage (TA = +25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 20 mA, f = 120 Hz) Dropout Voltage IO = 1.0 A, TJ = +25C Average Temperature Coefficient of Output Voltage IO = 5.0 mA, 0C TJ +125C Symbol VO Regline - - - - Regload - - VO - 4.75 IIB IIB - - Vn RR VI-VO - VO/T - -1.0 - 2.0 - mV/C - - - - 40 70 1.3 0.5 - - V 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, 0C < TJ < +125C, unless otherwise noted.)
Characteristics Output Voltage (TJ = +25C) Line Regulation (Note 1) - 8.0 Vdc VI -12 Vdc; IO = 1.0 A, TJ = +25C - 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 = +25C Load Regulation (Note 1) 5.0 mA IO 1.5 A, TJ = +25C 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 = +25C Output Noise Voltage (TA = +25C, 10 Hz f 100 kHz) Ripple Rejection (IO = mA, f = 120 Hz) Dropout Voltage IO = 1.0 A. TJ = +25C Average Temperature Coefficient of Output Voltage IO = 5.0 A, 0C TJ +125C Symbol VO Regline - - - - Regload - - - VO - 4.80 IIB IIB - - - Vn RR VI-VO - VO/T - -1.0 - 2.0 - mV/C - - - - - 40 70 1.3 0.5 0.5 - - V 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, 0C < TJ < +125C, unless otherwise noted.)
Characteristics Output Voltage (TJ = +25C) Line Regulation (Note 1) (TJ = +25C, IO = 100 mA) -7.2 Vdc VI - 25 Vdc - 8.0 Vdc VI -12 Vdc (TJ = +25C, IO = 500 mA) -7.2 Vdc VI - 25 Vdc - 8.0 Vdc VI -12 Vdc Load Regulation, TJ = +25C (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 = +25C) Input Bias Current Change -7.2 Vdc VI - 25 Vdc 5.0 mA IO 1.5 A Output Noise Voltage (TA = +25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 20 mA, f = 120 Hz) Dropout Voltage IO = 1.0 A, TJ = +25C Average Temperature Coefficient of Output Voltage IO = 5.0 mA, 0C TJ +125C Symbol VO Regline - - - - Regload - - VO - 4.95 IIB IIB - - Vn RR VI-VO - VO/T - -1.0 - 2.0 - mV/C - - - - 42 68 1.3 0.5 - - V 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, 0C < TJ < +125C, unless otherwise noted.)
Characteristics Output Voltage (TJ = +25C) Line Regulation (Note 1) (TJ = +25C, IO = 100 mA) - 8.0 Vdc VI - 25 Vdc -9.0 Vdc VI -13 Vdc (TJ = +25C, IO = 500 mA) - 8.0 Vdc VI - 25 Vdc - 9.0 Vdc VI -13 Vdc Load Regulation, TJ = +25C (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 = +25C) Input Bias Current Change - 8.0 Vdc VI - 25 Vdc 5.0 mA IO 1.5 A Output Noise Voltage (TA = +25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 20 mA, f = 120 Hz) Dropout Voltage IO = 1.0 A, TJ = +25C Average Temperature Coefficient of Output Voltage IO = 5.0 A, 0C TJ +125C Symbol VO Regline - - - - Regload - - VO - 5.7 IIB IIB - - Vn RR VI-VO - VO/T - -1.0 - 2.0 - mV/C - - - - 45 65 1.3 0.5 - - V 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, 0C < TJ < +125C, unless otherwise noted.)
Characteristics Output Voltage (TJ = +25C) Line Regulation (Note 1) (TJ = +25C, IO = 100 mA) -10.5 Vdc VI -25 Vdc -11 Vdc VI -17 Vdc (TJ = +25C, IO = 500 mA) -10.5 Vdc VI -25 Vdc -11 Vdc VI -17 Vdc Load Regulation, TJ = +25C (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 = +25C) Input Bias Current Change -10.5 Vdc VI - 25 Vdc 5.0 mA IO 1.5 A Output Noise Voltage (TA = +25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 20 mA, f = 120 Hz) Dropout Voltage IO = 1.0 A, TJ = +25C Average Temperature Coefficient of Output Voltage IO = 5.0 mA, 0C TJ +125C Symbol VO Regline - - - - Regload - - VO -7.6 IIB IIB - - Vn RR VI-VO - VO/T - -1.0 - 2.0 - mV/C - - - - 52 62 1.0 0.5 - - V 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, 0C < TJ < +125C, unless otherwise noted.)
Characteristics Output Voltage (TJ = +25C) Line Regulation (Note 1) (TJ = +25C, IO = 100 mA) -14.5 Vdc VI - 30 Vdc -16 Vdc VI - 22 Vdc (TJ = +25C, IO = 500 mA) -14.5 Vdc VI - 30 Vdc -16 Vdc VI - 22 Vdc Load Regulation, TJ = +25C (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 = +25C) Input Bias Current Change -14.5 Vdc VI - 30 Vdc 5.0 mA IO 1.5 A Output Noise Voltage (TA = +25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 20 mA, f = 120 Hz) Dropout Voltage IO = 1.0 A, TJ = +25C Average Temperature Coefficient of Output Voltage IO = 5.0 mA, 0C TJ +125C Symbol VO Regline - - - - Regload - - VO -11.4 IIB IIB - - Vn RR VI-VO - VO/T - -1.0 - 2.0 - mV/C - - - - 75 61 1.0 0.5 - - V 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, 0C < TJ < +125C, unless otherwise noted.)
Characteristics Output Voltage (TJ = +25C) Line Regulation (Note 1) -16 Vdc VI - 22 Vdc; IO = 1.0 A, TJ = +25C -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 = +25C Load Regulation (Note 1) 5.0 mA IO 1.5 A, TJ = +25C 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 = +25C Output Noise Voltage (TA = +25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 20 mA, f = 120 Hz) Dropout Voltage IO = 1.0 A, TJ = +25C Average Temperature Coefficient of Output Voltage IO = 5.0 A, 0C TJ +125C Symbol VO Regline - - - - Regload - - - VO -11.5 IIB IIB - - - Vn RR VI-VO - VO/T - -1.0 - 2.0 - mV/C - - - - - 75 61 0.8 0.5 0.5 - - V 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
MC7900
MC7915C ELECTRICAL CHARACTERISTICS (VI = - 23 V, IO = 500 mA, 0C < TJ < +125C, unless otherwise noted.)
Characteristics Output Voltage (TJ = +25C) Line Regulation (Note 1) (TJ = +25C, IO = 100 mA) -17.5 Vdc VI - 30 Vdc -20 Vdc VI - 26 Vdc (TJ = +25C, IO = 500 mA) -17.5 Vdc VI - 30 Vdc -20 Vdc VI - 26 Vdc Load Regulation, TJ = +25C (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 = +25C) Input Bias Current Change -17.5 Vdc VI - 30 Vdc 5.0 mA IO 1.5 A Output Noise Voltage (TA = +25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 20 mA, f = 120 Hz) Dropout Voltage IO = 1.0 A, TJ = +25C Average Temperature Coefficient of Output Voltage IO = 5.0 A, 0C TJ +125C Symbol VO Regline - - - - Regload - - VO -14.25 IIB IIB - - Vn RR VI-VO - VO/T - -1.0 - 2.0 - mV/C - - - - 90 60 1.0 0.5 - - V dB Vdc - - 4.4 -15.75 8.0 mA mA 68 25 300 150 Vdc 14 6.0 57 27 150 75 300 150 mV Min -14.4 Typ -15 Max -15.6 Unit Vdc mV
MC7915AC ELECTRICAL CHARACTERISTICS (VI = - 23 V, IO = 500 mA, 0C < TJ < +125C, unless otherwise noted.)
Characteristics Output Voltage (TJ = +25C) Line Regulation (Note 1) - 20 Vdc VI - 26 Vdc, IO = 1.0 A, TJ = +25C - 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 = +25C Load Regulation (Note 1) 5.0 mA IO 1.5 A, TJ = +25C 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 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 = +25C Output Noise Voltage (TA = +25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 20 mA, f = 120 Hz) Dropout Voltage IO = 1.0 A, TJ = +25C Average Temperature Coefficient of Output Voltage IO = 5.0 mA, 0C TJ +125C Symbol VO Regline - - - - Regload - - - VO -14.4 IIB IIB - - - Vn RR VI-VO - VO/T - -1.0 - 2.0 - mV/C - - - - - 90 60 0.8 0.5 0.5 - - V dB Vdc - - 4.4 -15.6 8.0 mA mA 68 25 40 150 75 150 Vdc 27 57 57 57 75 150 150 150 mV Min -14.7 Typ -15 Max -15.3 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.
6
MOTOROLA ANALOG IC DEVICE DATA
MC7900
MC7918C ELECTRICAL CHARACTERISTICS (VI = - 27 V, IO = 500 mA, 0C < TJ < +125C, unless otherwise noted.)
Characteristics Output Voltage (TJ = +25C) Line Regulation (Note 1) (TJ = +25C, IO = 100 mA) -21 Vdc VI - 33 Vdc -24 Vdc VI - 30 Vdc (TJ = +25C, IO = 500 mA) -21 Vdc VI - 33 Vdc -24 Vdc VI - 30 Vdc Load Regulation, TJ = +25C (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 = +25C) Input Bias Current Change -21 Vdc VI - 33 Vdc 5.0 mA IO 1.5 A Output Noise Voltage (TA = +25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 20 mA, f = 120 Hz) Dropout Voltage IO = 1.0 A, TJ = +25C Average Temperature Coefficient of Output Voltage IO = 5.0 mA, 0C TJ +125C Symbol VO Regline - - - - Regload - - VO -17.1 IIB IIB - - Vn RR VI-VO - VO/T - -1.0 - 2.0 - mV/C - - - - 110 59 1.0 0.5 - - V dB Vdc - - 4.5 -18.9 8.0 mA mA 110 55 360 180 Vdc 25 10 90 50 180 90 360 180 mV Min -17.3 Typ -18 Max -18.7 Unit Vdc mV
MC7924C ELECTRICAL CHARACTERISTICS (VI = - 33 V, IO = 500 mA, 0C < TJ < +125C, unless otherwise noted.)
Characteristics Output Voltage (TJ = +25C) Line Regulation (Note 1) (TJ = +25C, IO = 100 mA) - 27 Vdc VI - 38 Vdc - 30 Vdc VI - 36 Vdc (TJ = +25C, IO = 500 mA) - 27 Vdc VI - 38 Vdc - 30 Vdc VI - 36 Vdc Load Regulation, TJ = +25C (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 = +25C) Input Bias Current Change - 27 Vdc VI - 38 Vdc 5.0 mA IO 1.5 A Output Noise Voltage (TA = +25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 20 mA, f = 120 Hz) Dropout Voltage IO = 1.0 A, TJ = +25C Average Temperature Coefficient of Output Voltage IO = 5.0 mA, 0C TJ +125C Symbol VO Regline - - - - Regload - - VO - 22.8 IIB IIB - - Vn RR VI-VO - VO/T - -1.0 - 2.0 - mV/C - - - - 170 56 1.0 0.5 - - V dB Vdc - - 4.6 - 25.2 8.0 mA mA 150 85 480 240 Vdc 31 14 118 70 240 120 470 240 mV Min - 23 Typ - 24 Max - 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
7
MC7900
Figure 1. Worst Case Power Dissipation as a Function of Ambient Temperature
20 PD, POWER DISSIPATION (W) HS = 5C/W 5.0 4.0 HS = 15C/W 3.0 2.0 1.0 0.5 0.4 0.3 0.2 0.1 25 No Heatsink 10 Infinite Heatsink I O , OUTPUT CURRENT (A) 2.5 2.0 TJ = +25C 1.5 1.0 0.5 0
Figure 2. Peak Output Current as a Function of Input-Output Differential Voltage
JC = 5 C/W JA = 65 C/W PD(max) = 15W 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)
Figure 3. Ripple Rejection as a Function of Frequency
100 RR, RIPPLE REJECTION (dB) RR, RIPPLE REJECTION (dB) 80 60 40 20 0 Vin = -11 V VO = - 6.0 V IO = 20 mA 80
Figure 4. Ripple Rejection as a Function of Output Voltage
70
f = 120 Hz IO = 20 mA Vin = 1.0 V(RMS)
60
50
10
100
1.0 k f, FREQUENCY (Hz)
10 k
100 k
40
2.0
4.0
6.0
8.0 10 12 14 16 VO, OUTPUT VOLTAGE (V)
18
20
22
Figure 5. Output Voltage as a Function of Junction Temperature
6.26 6.22 6.18 6.14 6.10 6.06 -25 Vin = -11 V VD = - 6.0 V IO = 20 mA I IB , INPUT BIAS CURRENT (mA) VO, OUTPUT VOLTAGE (-V) 5.2
Figure 6. Quiescent Current as a Function of Temperature
5.0 4.8 4.6 4.4 4.2 Vin = -11 V VO = - 6.0 V IO = 20 mA
0
25
50
75
100
125
150
175
0
25
50
75
100
125
TJ, JUNCTION TEMPERATURE (C)
TJ, JUNCTION TEMPERATURE (C)
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 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 8. Current Boost Regulator
(- 5.0 V @ 4.0 A, with 5.0 A Current Limiting) -10 V Input 0.56 0.56 0.56 MJE200* or Equiv MC7905* 5.6 + 1.0 F 1.0 F Gnd - 20 V Input 0.33 F Gnd + 1.0 F MC7915 -15 V Output 1.0 F + 2N3055* or Equiv - 5.0 V Output
Figure 7. Current Regulator
-20 V Input 10 R IO = 200 mA - VO 10 V
MC7905
+ Gnd
1.0 F
+
1.0 F 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. IO = 5.0 V R + IB
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.
Figure 9. Operational Amplifier Supply
(15 @ 1.0 A) +20 V Input + 1.0 F +15 V Output 1.0 F + 1N4001 or Equiv Gnd
MC7815
10 F + 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. 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.
MOTOROLA ANALOG IC DEVICE DATA
9
MC7900
Figure 10. D2PAK Thermal Resistance and Maximum Power Dissipation versus P.C.B. Copper Length
PD(max) for TA = +50C 70 60 50 40 RJA 30 0 5.0 10 15 20 L, LENGTH OF COPPER (mm) Free Air Mounted Vertically 3.0 2.0 oz. Copper L Minimum Size Pad L 2.5 2.0 1.5 1.0 30 PD, MAXIMUM POWER DISSIPATION (W) 80 R JA, THERMAL RESISTANCE JUNCTION-TO-AIR (C/W) 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.
10
III III III III
25
MOTOROLA ANALOG IC DEVICE DATA
MC7900
OUTLINE DIMENSIONS
T SUFFIX PLASTIC PACKAGE CASE 221A-06 ISSUE Y
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. INCHES MIN MAX 0.570 0.620 0.380 0.405 0.160 0.190 0.025 0.035 0.142 0.147 0.095 0.105 0.110 0.155 0.018 0.025 0.500 0.562 0.045 0.060 0.190 0.210 0.100 0.120 0.080 0.110 0.045 0.055 0.235 0.255 0.000 0.050 - 0.045 0.080 - MILLIMETERS MIN MAX 14.48 15.75 9.66 10.28 4.82 4.07 0.88 0.64 3.73 3.61 2.66 2.42 3.93 2.80 0.64 0.46 14.27 12.70 1.52 1.15 5.33 4.83 3.04 2.54 2.79 2.04 1.39 1.15 6.47 5.97 1.27 0.00 - 1.15 2.04 -
B
F T
4
C
-T -
SEATING PLANE
S
DIM A B C D F G H J K L N Q R S T U V Z
Q
123
A U K
H Z L V G D N J R
D2T SUFFIX PLASTIC PACKAGE CASE 936-03 (D2PAK) ISSUE B
OPTIONAL CHAMFER
A
E
-T -
TERMINAL 4
U
K B
S V H F
1 2 3
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. INCHES MIN MAX 0.386 0.403 0.356 0.368 0.170 0.180 0.026 0.036 0.045 0.055 0.051 REF 0.100 BSC 0.539 0.579 0.125 MAX 0.050 REF 0.000 0.010 0.088 0.102 0.018 0.026 0.058 0.078 5 _ REF 0.116 REF 0.200 MIN 0.250 MIN MILLIMETERS MIN MAX 9.804 10.236 9.042 9.347 4.318 4.572 0.660 0.914 1.143 1.397 1.295 REF 2.540 BSC 13.691 14.707 3.175 MAX 1.270 REF 0.000 0.254 2.235 2.591 0.457 0.660 1.473 1.981 5 _ REF 2.946 REF 5.080 MIN 6.350 MIN
M J D 0.010 (0.254) M T G N R
L P
C
DIM A B C D E F G H J K L M N P R S U V
MOTOROLA ANALOG IC DEVICE DATA
11
MC7900
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12
MOTOROLA ANALOG IC DEVICE DATA MC7900/D
*MC7900/D*

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