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MC7900 Series 1.0 A 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 * Internal Thermal Overload Protection * Internal Short Circuit Current Limiting * Output Transistor Safe-Area Compensation * Available in 2% Voltage Tolerance (See Ordering Information)
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TO-220 T SUFFIX CASE 221A Heatsink surface connected to Pin 2.
1 2 3
Pin 1. Ground 2. Input 3. Output D2PAK D2T SUFFIX CASE 936
1
2 3
Heatsink surface (shown as terminal 4 in case outline drawing) is connected to Pin 2.
STANDARD APPLICATION
Gnd 14.7 k 2.4 k 2.0 k 2.0 k 8.0 k 1.0 k 1.6 k R2 10 k 20 pF 10 pF 2.0 k 20 k 20 k 10 k 240 750 VI VO 4.0 k R1
Input Cin* 0.33 F
MC79XX
Output CO** 1.0 F
12 k
1.0 k
1.2 k
4.0 k
3.6 k
25
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.
1.1 k
0.3
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 11 of this data sheet.
This device contains 26 active transistors.
Figure 1. Representative Schematic Diagram
DEVICE MARKING INFORMATION
See general marking information in the device marking section on page 12 of this data sheet.
(c) Semiconductor Components Industries, LLC, 2002
1
January, 2002 - Rev. 9
Publication Order Number: MC7900/D
MC7900 Series
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
1. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used.
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MC7900 Series
MC7905AC ELECTRICAL CHARACTERISTICS (VI = -10 V, IO = 500 mA, 0C < TJ < +125C, unless otherwise noted.)
Characteristics Output Voltage (TJ = +25C) Line Regulation (Note 2) -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 2) 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 - - - - - - - 40 70 2.0 1.3 0.5 0.5 - - - V dB Vdc mV/C - - 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 2) (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 2) 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 - - - - - - 42 68 2.0 1.3 0.5 - - - V dB Vdc mV/C - - 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
2. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used.
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MC7900 Series
MC7906C ELECTRICAL CHARACTERISTICS (VI = -11 V, IO = 500 mA, 0C < TJ < +125C, unless otherwise noted.)
Characteristics Output Voltage (TJ = +25C) Line Regulation (Note 3) (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 3) 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 - - - - - - 45 65 2.0 1.3 0.5 - - - V dB Vdc mV/C - - 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 3) (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 3) 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 - - - - - - 52 62 2.0 1.0 0.5 - - - V dB Vdc mV/C - - 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
3. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used.
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MC7900 Series
MC7912C ELECTRICAL CHARACTERISTICS (VI = -19 V, IO = 500 mA, 0C < TJ < +125C, unless otherwise noted.)
Characteristics Output Voltage (TJ = +25C) Line Regulation (Note 4) (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 4) 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 - - - - - - 75 61 2.0 1.0 0.5 - - - V dB Vdc mV/C - - 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 4) -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 4) 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 - - - - - - - 75 61 2.0 0.8 0.5 0.5 - - - V dB Vdc mV/C - - 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
4. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used.
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MC7900 Series
MC7915C ELECTRICAL CHARACTERISTICS (VI = -23 V, IO = 500 mA, 0C < TJ < +125C, unless otherwise noted.)
Characteristics Output Voltage (TJ = +25C) Line Regulation (Note 5) (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 5) 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 - - - - - - 90 60 2.0 1.0 0.5 - - - V dB Vdc mV/C - - 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 5) -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 5) 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 - - - - - - - 90 60 2.0 0.8 0.5 0.5 - - - V dB Vdc mV/C - - 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
5. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used.
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MC7900 Series
MC7918C ELECTRICAL CHARACTERISTICS (VI = -27 V, IO = 500 mA, 0C < TJ < +125C, unless otherwise noted.)
Characteristics Output Voltage (TJ = +25C) Line Regulation (Note 6) (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 6) 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 - - - - - - 110 59 2.0 1.0 0.5 - - - V dB Vdc mV/C - - 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 6) (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 6) 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 - - - - - - 170 56 2.0 1.0 0.5 - - - V dB Vdc mV/C - - 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
6. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used.
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MC7900 Series
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 1.5 1.0 0.5 0
TJ = +25C
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 2. Worst Case Power Dissipation as a Function of Ambient Temperature
Figure 3. Peak Output Current as a Function of Input-Output Differential Voltage
100 RR, RIPPLE REJECTION (dB) 80 60 40 20 0
RR, RIPPLE REJECTION (dB)
Vin = -11 V VO = -6.0 V IO = 20 mA
80 f = 120 Hz IO = 20 mA Vin = 1.0 V(RMS)
70
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 4. Ripple Rejection as a Function of Frequency
Figure 5. Ripple Rejection as a Function of Output Voltage
6.26 VO, OUTPUT VOLTAGE (-V) 6.22 6.18 6.14 6.10 6.06 -25
5.2 I IB , INPUT BIAS CURRENT (mA) 5.0 4.8 4.6 4.4 4.2 Vin = -11 V VO = -6.0 V IO = 20 mA
Vin = -11 V VD = -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)
Figure 6. Output Voltage as a Function of Junction Temperature
Figure 7. Quiescent Current as a Function of Temperature
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MC7900 Series
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.
-20 V Input MC7905 10 R IO = 200 mA VO 10 V
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 8. Current Regulator
-10 V Input
0.56 0.56 0.56 MJE200* or Equiv 2N3055* or Equiv
-5.0 V Output
+20 V Input 0.33 F Gnd + 1.0 F +
MC7815 1.0 F +
+15 V Output 1N4001 or Equiv Gnd
MC7905* 1.0 F 1.0 F Gnd -20 V Input
1.0 F MC7915
1.0 F
+
10 F + Gnd
5.6 +
+
-15 V Output
*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.
Figure 9. Current Boost Regulator
(-5.0 V @ 4.0 A, with 5.0 A Current Limiting)
Figure 10. Operational Amplifier Supply
(15 @ 1.0 A)
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MC7900 Series
PD(max) for TA = +50C Free Air Mounted Vertically Minimum Size Pad PD, MAXIMUM POWER DISSIPATION (W) 80 R JA, THERMAL RESISTANCE JUNCTION TO AIR ( C/W) 70 60 50 40 RJA 30 0 5.0 10 15 20 3.5 3.0 2.0 oz. Copper L L 2.5 2.0 1.5 1.0 30
L, LENGTH OF COPPER (mm)
Figure 11. D2PAK Thermal Resistance and Maximum Power Dissipation versus P.C.B. Copper Length
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.
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III III III III
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MC7900 Series
ORDERING INFORMATION
Nominal Output Voltage Output Voltage Tolerance 2% 2% 4% 4% 5.0 V 2% 4% 4% 4% 4% 5.2 V 6.0 60V 4% 4% 4% 4% 4% 8.0 80V 2% 4% 2% 2% 4% 4% 12 V 2% 4% 4% 4% 4% 2% 4% 4% 15 V 2% 4% 4% 4% 18 V 4% 4% 24 V 4% 4% Operating Temperature Range
Device MC7905ACD2T MC7905ACD2TR4 MC7905CD2T MC7905CD2TR4 MC7905ACT MC7905CT MC7905BD2T MC7905BD2TR4 MC7905BT MC7905.2CT MC7906CD2T MC7906CT MC7908CD2T MC7908CD2TR4 MC7908ACT MC7908CT MC7912ACD2T MC7912ACD2TR4 MC7912CD2T MC7912CD2TR4 MC7912ACT MC7912CT MC7912BD2T MC7912BD2TR4 MC7912BT MC7915ACD2T MC7915CD2T MC7915CD2TR4 MC7915ACT MC7915CT MC7915BD2T MC7915BT MC7918CT MC7924CD2T MC7924CT MC7924BT
Package D2PAK D2PAK D2PAK D2PAK TO-220 TO-220 D2PAK D2PAK TO-220 TO-220 D2PAK TO-220 D2PAK D2PAK TO-220 TO-220 D2PAK D2PAK D2PAK D2PAK TO-220 TO-220 D2PAK D2PAK TO-220 D2PAK D2PAK D2PAK TO-220 TO-220 D2PAK TO-220 TO-220 D2PAK TO-220 TO-220
Shipping 50 Units/Rail 800 Tape & Reel 50 Units/Rail
TJ = 0 to +125C
800 Tape & Reel 50 Units/Rail 50 Units/Rail 50 Units/Rail
TJ = -40 to +125C
800 Tape & Reel 50 Units/Rail 50 Units/Rail 50 Units/Rail 50 Units/Rail 50 Units/Rail 800 Tape & Reel 50 Units/Rail
TJ = 0 to +125C
50 Units/Rail 50 Units/Rail 800 Tape & Reel 50 Units/Rail 800 Tape & Reel 50 Units/Rail 50 Units/Rail 50 Units/Rail
TJ = -40 to +125C
800 Tape & Reel 50 Units/Rail 50 Units/Rail 50 Units/Rail
TJ = 0 to +125C
800 Tape & Reel 50 Units/Rail 50 Units/Rail 50 Units/Rail
TJ = -40 to +125C 40
50 Units/Rail 50 Units/Rail
TJ = 0 to +125C
50 Units/Rail 50 Units/Rail
TJ = -40 to +125C
50 Units/Rail
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MC7900 Series
MARKING DIAGRAMS
TO-220 T SUFFIX CASE 221A
MC 79xxACT AWLYWW
MC 7905.2CT AWLYWW
MC 79xxBT AWLYWW
MC 79xxCT AWLYWW
123
123
123
123
D2PAK D2T SUFFIX CASE 936
MC 79xxACD2T AWLYWW 2 1 3
MC 79xxBD2T AWLYWW 2 1 3
MC 79xxCD2T AWLYWW 2 1 3
xx A WL Y WW
= Nominal Voltage = Assembly Location = Wafer Lot = Year = Work Week
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MC7900 Series
PACKAGE DIMENSIONS
TO-220 T SUFFIX PLASTIC PACKAGE CASE 221A-09 ISSUE AA
SEATING PLANE NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION Z DEFINES A ZONE WHERE ALL BODY AND LEAD IRREGULARITIES ARE ALLOWED. DIM A B C D F G H J K L N Q R S T U V Z 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 4.07 4.82 0.64 0.88 3.61 3.73 2.42 2.66 2.80 3.93 0.46 0.64 12.70 14.27 1.15 1.52 4.83 5.33 2.54 3.04 2.04 2.79 1.15 1.39 5.97 6.47 0.00 1.27 1.15 ----2.04
-T- B
4
F T S
C
Q
123
A U K
H Z L V G D N R J
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MC7900 Series
PACKAGE DIMENSIONS
D2PAK D2T SUFFIX PLASTIC PACKAGE CASE 936-03 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
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MC7900 Series
Notes
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MC7900 Series
ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC 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 special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC 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. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC 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 SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC 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 SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
PUBLICATION ORDERING INFORMATION
Literature Fulfillment: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: ONlit@hibbertco.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada JAPAN: ON Semiconductor, Japan Customer Focus Center 4-32-1 Nishi-Gotanda, Shinagawa-ku, Tokyo, Japan 141-0031 Phone: 81-3-5740-2700 Email: r14525@onsemi.com ON Semiconductor Website: http://onsemi.com For additional information, please contact your local Sales Representative.
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MC7900/D

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