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Three-Terminal Medium Current Positive Voltage Regulators
The MC78M00/MC78M00A Series positive voltage regulators are identical to the popular MC7800 Series devices, except that they are specified for only half the output current. Like the MC7800 devices, the MC78M00 three-terminal regulators are intended for local, on-card voltage regulation. Internal current limiting, thermal shutdown circuitry and safe-area compensation for the internal pass transistor combine to make these devices remarkably rugged under most operating conditions. Maximum output current, with adequate heatsinking is 500 mA. * No External Components Required
MC78M00 MC78M00A Series
THREE-TERMINAL MEDIUM CURRENT POSITIVE FIXED VOLTAGE REGULATORS
SEMICONDUCTOR TECHNICAL DATA
* * * * *
Internal Thermal Overload Protection Internal Short Circuit Current Limiting Output Transistor Safe-Area Compensation MC78M00A High Accuracy (2%) Available for 5.0 V, 8.0 V, 12 V and 15 V Previous Commerical Temperature Range has been extended to a Junction Temperature Range of -40C to +125C
T SUFFIX PLASTIC PACKAGE CASE 221A (TO-220) Heatsink surface connected to Pin 2.
1 2 3
Representative Schematic Diagram
Input 210 6.7 V 16 k 300 3.6 k 6.4 k 5.6 k 1.0 k 3.0 k 10 pF 300 0.24 13 520 50 2.6 k 6.0 k 40 pF 200 Output
Pin 1. Input 2. Ground 3. Output
1.0 k
1.0 k
1
100 200
1 3
2
3
DT SUFFIX PLASTIC PACKAGE CASE 369A (DPAK)
DT-1 SUFFIX PLASTIC PACKAGE CASE 369 (DPAK)
Heatsink surface (shown as terminal 4 in case outline drawing) is connected to Pin 2.
2.0 k
3.9 k
6.0 k
2.8 k
Gnd
ORDERING INFORMATION
Device
MC78MXXCDT
This device contains 28 active transistors.
Operating Temperature Range Package
DPAK TJ = - 40 to +125C TO-220
DEVICE TYPE/NOMINAL OUTPUT VOLTAGE
MC78M05AC MC78M05C MC78M06C MC78M08AC MC78M08C 5.0 V 5.0 V 6.0 V 8.0 V 8.0 V MC78M09C MC78M12AC MC78M12C MC78M15AC MC78M15C 9.0 V 12 V 12 V 15 V 15 V MC78M18C MC78M20C MC78M24C 18 V 20 V 24 V
MC78MXXACDT* MC78MXXCT MC78MXXACT*
XX Indicates nominal voltage. * Available in 5.0, 8.0, 12 and 15 V devices. Rev 6
(c) Motorola, Inc. 1997
MOTOROLA ANALOG IC DEVICE DATA
1
MC78M00 MC78M00A Series
MAXIMUM RATINGS (TA = 25C, unless otherwise noted.)
Rating Input Voltage (5.0 V-18 V) (20 V-24V) Power Dissipation (Package Limitation) Plastic Package, T Suffix TA = 25C Thermal Resistance, Junction-to-Air Thermal Resistance, Junction-to-Case Plastic Package, DT Suffix TA = 25C Thermal Resistance, Junction-to-Air Thermal Resistance, Junction-to-Case Operating Junction Temperature Range Storage Temperature Range
NOTE: ESD data available upon request.
Symbol VI
Value 35 40
Unit Vdc
PD JA JC PD JA JC TJ Tstg
Internally Limited 70 5.0 Internally Limited 92 5.0 +150 -65 to +150
C/W C/W
C/W C/W C C
MC78M05C/AC ELECTRICAL CHARACTERISTICS (VI = 10 V, IO = 350 mA, -40C < TJ < 125C, PD 5.0 W,
unless otherwise noted.) Characteristics Output Voltage (TJ = 25C) MC78M05C MC78M05AC Output Voltage Variation (7.0 Vdc VI 20 Vdc, 5.0 mA IO 350 mA) MC78M05C MC78M05AC Line Regulation (TJ = 25C, 7.0 Vdc VI 25 Vdc, IO = 200 mA) Load Regulation (TJ = 25C, 5.0 mA IO 200 mA) (TJ = 25C, 5.0 mA IO 500 mA) Input Bias Current (TJ = 25C) Quiescent Current Change (8.0 Vdc VI 25 Vdc, IO = 200 mA) (5.0 mA IO 350 mA) Output Noise Voltage (TA = 25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 100 mA, f = 120 Hz, 8.0 V VI 18 V) (IO = 300 mA, f = 120 Hz, 8.0 VI 18 V, TJ = 25C) Dropout Voltage (TJ = 25C) Short Circuit Current Limit (TJ = 25C, VI = 35 V) Average Temperature Coefficient of Output Voltage (IO = 5.0 mA) Peak Output Current (TJ = 25C) Symbol VO 4.8 4.9 VO 4.75 4.80 Regline Regload - - IIB IIB - - - Vn RR - 62 62 VI-VO IOS VO/T IO - - - - 20 10 3.2 - - 40 - 80 2.0 50 0.2 700 100 50 6.0 0.8 0.5 - - - - - - - Vdc mA mV/C mA V dB mA mA - - - 3.0 5.25 5.20 5.0 mV mV 5.0 5.0 5.2 5.1 Vdc Min Typ Max Unit Vdc
2
MOTOROLA ANALOG IC DEVICE DATA
MC78M00 MC78M00A Series
MC78M06C ELECTRICAL CHARACTERISTICS (VI = 11 V, IO = 350 mA, -40C < TJ < 125C, PD 5.0 W, unless otherwise noted.)
Characteristics Output Voltage (TJ = 25C) Output Voltage Variation (8.0 Vdc VI 21 Vdc, 5.0 mA IO 350 mA) Line Regulation (TJ = 25C, 8.0 Vdc VI 25 Vdc, IO = 200 mA) Load Regulation (TJ = 25C, 5.0 mA IO 500 mA) (TJ = 25C, 5.0 mA IO 200 mA) Input Bias Current (TJ = 25C) Quiescent Current Change (9.0 Vdc VI 25 Vdc, IO = 200 mA) (5.0 mA IO 350 mA) Output Noise Voltage (TA = 25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 100 mA, f = 120 Hz, 9.0 V VI 19 V) (IO = 300 mA, f = 120 Hz, 9.0 V VI 19 V, TJ = 25C) Dropout Voltage (TJ = 25C) Short Circuit Current Limit (TJ = 25C, VI = 35 V) Average Temperature Coefficient of Output Voltage (IO = 5.0 mA) Peak Output Current (TJ = 25C) Symbol VO VO Regline Regload - - IIB IIB - - - Vn RR - 59 59 VI - VO IOS VO/T IO - - - - 20 10 3.2 - - 45 - 80 2.0 50 0.2 700 120 60 6.0 0.8 0.5 - - - - - - - Vdc mA mV/C mA V dB mA mA Min 5.75 5.7 - Typ 6.0 - 5.0 Max 6.25 6.3 50 Unit Vdc Vdc mV mV
MC78M08C/AC ELECTRICAL CHARACTERISTICS (VI = 14 V, IO = 350 mA, -40C < TJ < 125C, PD 5.0 W,
unless otherwise noted.) Characteristics Output Voltage (TJ = 25C) MC78M08C MC78M08AC Output Voltage Variation (10.5 Vdc VI 23 Vdc, 5.0 mA IO 350 mA) MC78M08C MC78M08AC Line Regulation (TJ = 25C, 10.5 Vdc VI 25 Vdc, IO = 200 mA) Load Regulation (TJ = 25C, 5.0 mA IO 500 mA) (TJ = 25C, 5.0 mA IO 200 mA) Input Bias Current (TJ = 25C) Quiescent Current Change (10.5 Vdc VI 25 Vdc, IO = 200 mA) (5.0 mA IO 350 mA) Output Noise Voltage (TA = 25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 100 mA, f = 120 Hz, 11.5 V VI 21.5 V) (IO = 300 mA, f = 120 Hz, 11.5 V VI 21.5 V, TJ = 25C) Dropout Voltage (TJ = 25C) Short Circuit Current Limit (TJ = 25C, VI = 35 V) Average Temperature Coefficient of Output Voltage (IO = 5.0 mA) Peak Output Current (TJ = 25C) Symbol VO 7.70 7.84 VO 7.6 7.7 Regline Regload - - IIB IIB - - - Vn RR - 56 56 VI-VO IOS VO/T IO - - - - 25 10 3.2 - - 52 - 80 2.0 50 0.2 700 160 80 6.0 0.8 0.5 - - - - - - - Vdc mA mV/C mA V dB mA mA - - - 6.0 8.4 8.3 50 mV mV 8.0 8.0 8.30 8.16 Vdc Min Typ Max Unit Vdc
MOTOROLA ANALOG IC DEVICE DATA
3
MC78M00 MC78M00A Series
MC78M09C ELECTRICAL CHARACTERISTICS (VI = 15 V, IO = 350 mA, -40C < TJ < 125C, PD 5.0 W, unless otherwise noted.)
Characteristics Output Voltage (TJ = 25C) Output Voltage Variation (11.5 Vdc VI 23 Vdc, 5.0 mA IO 350 mA) Line Regulation (TJ = 25C, 11.5 Vdc VI 25 Vdc, IO = 200 mA) Load Regulation (TJ = 25C, 5.0 mA IO 500 mA) (TJ = 25C, 5.0 mA IO 200 mA) Input Bias Current (TJ = 25C) Quiescent Current Change (11.5 Vdc VI 25 Vdc, IO = 200 mA) (5.0 mA IO 350 mA) Output Noise Voltage (TA = 25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 100 mA, f = 120 Hz, 12.5 V VI 22.5 V) (IO = 300 mA, f = 120 Hz, 12.5 V VI 22.5 V, TJ = 25C) Dropout Voltage (TJ = 25C) Short Circuit Current Limit (TJ = 25C, VI = 35 V) Average Temperature Coefficient of Output Voltage (IO = 5.0 mA) Peak Output Current (TJ = 25C) Symbol VO VO Regline Regload - - IIB IIB - - - Vn RR - 56 56 VI-VO IOS VO/T IO - - - - 25 10 3.2 - - 52 - 80 2.0 50 0.2 700 180 90 6.0 0.8 0.5 - - - - - - - Vdc mA mV/C mA V dB mA mA Min 8.64 8.55 - Typ 9.0 - 6.0 Max 9.45 9.45 50 Unit Vdc Vdc mV mV
MC78M12C/AC ELECTRICAL CHARACTERISTICS (VI = 19 V, IO = 350 mA, -40C < TJ < 125C, PD 5.0 W,
unless otherwise noted.) Characteristics Output Voltage (TJ = 25C) MC78M12C MC78M12AC Output Voltage Variation (14.5 Vdc VI 27 Vdc, 5.0 mA IO 350 mA) MC78M12C MC78M12AC Line Regulation (TJ = 25C, 14.5 Vdc VI 30 Vdc, IO = 200 mA) Load Regulation (TJ = 25C, 5.0 mA IO 500 mA) (TJ = 25C, 5.0 mA IO 200 mA) Input Bias Current (TJ = 25C) Quiescent Current Change (14.5 Vdc VI 30 Vdc, IO = 200 mA) (5.0 mA IO 350 mA) Output Noise Voltage (TA = 25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 100 mA, f = 120 Hz, 15 V VI 25 V) (IO = 300 mA, f = 120 Hz, 15 V VI 25 V, TJ = 25C) Dropout Voltage (TJ = 25C) Short Circuit Current Limit (TJ = 25C, VI = 35 V) Average Temperature Coefficient of Output Voltage (IO = 5.0 mA) Peak Output Current (TJ = 25C) Symbol VO 11.50 11.76 VO 11.4 11.5 Regline Regload - - IIB IIB - - Vn RR 55 55 VI-VO IOS VO/T IO - - - - - 80 2.0 50 0.3 700 - - - - - - Vdc mA mV/C mA - - - 75 0.8 0.5 - V dB - 25 10 3.2 240 120 6.0 mA mA - - - 8.0 12.6 12.5 50 mV mV 12 12 12.50 12.24 Vdc Min Typ Max Unit Vdc
4
MOTOROLA ANALOG IC DEVICE DATA
MC78M00 MC78M00A Series
MC78M15C/AC ELECTRICAL CHARACTERISTICS (VI = 23 V, IO = 350 mA, -40C < TJ < 125C, PD 5.0 W,
unless otherwise noted.) Characteristics Output Voltage (TJ = 25C) MC78M15C MC78M15AC Output Voltage Variation (17.5 Vdc VI 30 Vdc, 5.0 mA IO 350 mA) MC78M15C MC78M15AC Input Regulation (TJ = 25C, 17.5 Vdc VI 30 Vdc, IO = 200 mA) Load Regulation (TJ = 25C, 5.0 mA IO 500 mA) (TJ = 25C, 5.0 mA IO 200 mA) Input Bias Current (TJ = 25C) Quiescent Current Change (17.5 Vdc VI 30 Vdc, IO = 200 mA) (5.0 mA IO 350 mA) Output Noise Voltage (TA = 25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 100 mA, f = 120 Hz, 18.5 V VI 28.5 V) (IO = 300 mA, f = 120 Hz, 18.5 V VI 28.5 V, TJ = 25C) Dropout Voltage (TJ = 25C) Short Circuit Current Limit (TJ = 25C, VI = 35 V) Average Temperature Coefficient of Output Voltage (IO = 5.0 mA) Peak Output Current (TJ = 25C) Symbol VO 14.4 14.7 VO 14.25 14.40 Regline Regload - - IIB IIB - - - Vn RR - 54 54 VI-VO IOS VO/T IO - - - - 25 10 3.2 - - 90 - 70 2.0 50 0.3 700 300 150 6.0 0.8 0.5 - - - - - - - Vdc mA mV/C mA V dB mA mA - - - 10 15.75 15.60 50 mV mV 15 15 15.6 15.3 Vdc Min Typ Max Unit Vdc
MC78M18C ELECTRICAL CHARACTERISTICS (VI = 27 V, IO = 350 mA, -40C < TJ < 125C, PD 5.0 W, unless otherwise noted.)
Characteristics Output Voltage (TJ = 25C) Output Voltage Variation (21 Vdc VI 33 Vdc, 5.0 mA IO 350 mA) Line Regulation (TJ = 25C, 21 Vdc VI 33 Vdc, IO = 200 mA) Load Regulation (TJ = 25C, 5.0 mA IO 500 mA) (TJ = 25C, 5.0 mA IO 200 mA) Input Bias Current (TJ = 25C) Quiescent Current Change (21 Vdc VI 33 Vdc, IO = 200 mA) (5.0 mA IO 350 mA) Output Noise Voltage (TA = 25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 100 mA, f = 120 Hz, 22 V VI 32 V) (IO = 300 mA, f = 120 Hz, 22 V VI 32 V, TJ = 25C) Dropout Voltage (TJ = 25C) Short Circuit Current Limit (TJ = 25C, VI = 35 V) Average Temperature Coefficient of Output Voltage (IO = 5.0 mA) Peak Output Current (TJ = 25C) Symbol VO VO Regline Regload - - IIB IIB - - - Vn RR - 53 53 VI-VO IOS VO/T IO - - - - 30 10 3.2 - - 100 - 70 2.0 50 0.3 700 360 180 6.5 0.8 0.5 - - - - - - - Vdc mA mV/C mA V dB mA mA Min 17.3 17.1 - Typ 18 - 10 Max 18.7 18.9 50 Unit Vdc Vdc mV mV
MOTOROLA ANALOG IC DEVICE DATA
5
MC78M00 MC78M00A Series
MC78M20C ELECTRICAL CHARACTERISTICS (VI = 29 V, IO = 350 mA, -30C < TJ < 125C, PD 5.0 W, unless otherwise noted.)
Characteristics Output Voltage (TJ = 25C) Output Voltage Variation (23 Vdc VI 35 Vdc, 5.0 mA IO 350 mA) Line Regulation (TJ = 25C, 23 Vdc VI 35 Vdc, IO = 200 mA) Load Regulation (TJ = 25C, 5.0 mA IO 500 mA) (TJ = 25C, 5.0 mA IO 200 mA) Input Bias Current (TJ = 25C) Quiescent Current Change (23 Vdc VI 35 Vdc, IO = 200 mA) (5.0 mA IO 350 mA) Output Noise Voltage (TA = 25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 100 mA, f = 120 Hz, 24 V VI 34 V) (IO = 300 mA, f = 120 Hz, 24 V VI 34 V, TJ = 25C) Dropout Voltage (TJ = 25C) Short Circuit Current Limit (TJ = 25C, VI = 35 V) Average Temperature Coefficient of Output Voltage (IO = 5.0 mA) Peak Output Current (TJ = 25C) Symbol VO VO Regline Regload - - IIB IIB - - - Vn RR - 52 52 VI-VO IOS VO/T IO - - - - 30 10 3.2 - - 110 - 70 2.0 50 0.5 700 400 200 6.5 0.8 0.5 - - - - - - - Vdc mA mV/C mA V dB mA mA Min 19.2 19 - Typ 20 - 10 Max 20.8 21 50 Unit Vdc Vdc mV mV
MC78M24C ELECTRICAL CHARACTERISTICS (VI = 33 V, IO = 350 mA, -40C < TJ < 125C, PD 5.0 W, unless otherwise noted.)
Characteristics Output Voltage (TJ = 25C) Output Voltage Variation (27 Vdc VI 38 Vdc, 5.0 mA IO 350 mA) Line Regulation (TJ = 25C, 27 Vdc VI 38 Vdc, IO = 200 mA) Load Regulation (TJ = 25C, 5.0 mA IO 500 mA) (TJ = 25C, 5.0 mA IO 200 mA) Input Bias Current (TJ = 25C) Quiescent Current Change (27 Vdc VI 38 Vdc, IO = 200 mA) (5.0 mA IO 350 mA) Output Noise Voltage (TA = 25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 100 mA, f = 120 Hz, 28 V VI 38 V) (IO = 300 mA, f = 120 Hz, 28 V VI 38 V, TJ = 25C) Dropout Voltage (TJ = 25C) Short Circuit Current Limit (TJ = 25C) Average Temperature Coefficient of Output Voltage (IO = 5.0 mA) Peak Output Current (TJ = 25C) Symbol VO VO Regline Regload - - IIB IIB - - - Vn RR - 50 50 VI-VO IOS VO/T IO - - - - 30 10 3.2 - - 170 - 70 2.0 50 0.5 700 480 240 7.0 0.8 0.5 - - - - - - - Vdc mA mV/C mA V dB mA mA Min 23 22.8 - Typ 24 - 10 Max 25 25.2 50 Unit Vdc Vdc mV mV
6
MOTOROLA ANALOG IC DEVICE DATA
MC78M00 MC78M00A Series
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.
Figure 1. DPAK Thermal Resistance and Maximum Power Dissipation versus P.C.B. Copper Length
Free Air Mounted Vertically Minimum Size Pad PD(max) for TA = 50C 2.0 2.0 oz. Copper L L 1.6 1.2 0.8 0.4 0 30 PD, MAXIMUM POWER DISSIPATION (W) 100 R JA, THERMAL RESISTANCE 90 80 70 60 50 RJA 40 0 5.0 10 15 20 2.4
JUNCTION-TO-AIR (C/W)
L, LENGTH OF COPPER (mm)
Figure 2. Worst Case Power Dissipation versus Ambient Temperature (TO-220)
10 PD, POWER DISSIPATION (W) 5.0 3.0 2.0 1.0 0.5 0.3 0.2 0.1 25 JC = 5C/W PD(max) = 7.52 W 50 75 100 125 150 TA, AMBIENT TEMPERATURE (C) HS = 20C/W No Heat Sink HS = 10C/W Infinite Heat Sink
MOTOROLA ANALOG IC DEVICE DATA
III III III III
25
7
MC78M00 MC78M00A Series
Figure 3. Peak Output Current versus Dropout Voltage
1.0 V I -V O , DROPOUT VOLTAGE (V) 0.9 I O , OUTPUT CURRENT (A) 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 5.0 10 15 20 25 30 35 40 TJ = 125C TJ = 25C 2.5 2.0 IO = 500 mA 1.5 IO = 100 mA 1.0 0.5 0 VO = 100 mV IO = 10 mA
Figure 4. Dropout Voltage versus Junction Temperature
0
25
50
75
100
125
150
VI - VO, DROPOUT VOLTAGE (V)
TJ, JUNCTION TEMPERATURE (C)
Figure 5. Ripple Rejection versus Frequency
100 RR, RIPPLE REJECTION (dB) RR, RIPPLE REJECTION (dB) Iout = 500 mA 80
Figure 6. Ripple Rejection versus Output Current
100
80
60
40
Iout = 500 mA Vout = 5.0 V Vin = 10 V CO = 0 TJ = 25C
60
40 30 0.01
Vout = 5.0 V Vin = 10 V CO = 0 f = 120 Hz TJ = 25C
20 1.0
10
100
1.0 k
10 k
100 k
1.0 M
10 M
100 M
0.1
0.5 1.0
10
f, FREQUENCY (Hz)
IO, OUTPUT CURRENT (A)
Figure 7. Bias Current versus Input Voltage
4.0 TJ = 25C I B , BIAS CURRENT (mA) 3.0 TJ = 125C I B , BIAS CURRENT (mA) 4.0 3.0 2.0 1.0 5.0
Figure 8. Bias Current versus Output Current
TJ = 25C
2.0 TJ = 25C 1.0 TJ = 125C 0 0 5.0 10
VO = 5.0 V IO = 0.5 A
TJ = 125C VI-VO = 5.0 V
15
20
25
30
35
40
0 0.01
0.1
0.5
1.0
10
VI, INPUT VOLTAGE (Vdc)
IO, OUTPUT CURRENT (A)
8
MOTOROLA ANALOG IC DEVICE DATA
MC78M00 MC78M00A Series
APPLICATIONS INFORMATION
Design Considerations The MC78M00/MC78M00A 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 bypass capacitor should be mounted with the shortest possible leads directly across the regulator's 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.
Figure 9. Current Regulator
Input 0.33 F IO MC78M05C R Constant Current to Grounded Load
Figure 10. Adjustable Output Regulator
VO, 7.0 V to 20 V Vin-Vout 2.0 V Output Input MC78M05C
7 The MC78M00 regulators can also be used as a current source when connected as above. In order to minimize dissipation the MC78M05C is chosen in this application. Resistor R determines the current as follows: IO = 5.0 V + IIB R 0.33 F 6 4
*
+
2 0.1 F 3 10 k
1.0 k
MC1741
IIB = 1.5 mA over line and load changes. For example, a 500 mA current source would require R to be a 5.0 , 10 W resistor and the output voltage compliance would be the input voltage less 7.0 V. The addition of an operational amplifier allows adjustment to higher or intermediate values while retaining regulation characteristics. The minimum voltage obtainable with this arrangement is 2.0 V greater than the regulator voltage.
Figure 11. Current Boost Regulator
MJ2955 or Equiv. Input Input R
Figure 12. Current Boost with Short Circuit Protection
MJ2955 or Equiv.
RSC
MC78MXXC
Output 1.0 F 2N6049 or Equiv. MC78MXXC 1.0 F XX = 2 digits of type number indicating voltage. Output
1.0 F
R
XX = 2 digits of type number indicating voltage.
The MC78M00 series can be current boosted with a PNP transistor. The MJ2955 provides current to 5.0 A. Resistor R in conjunction with the VBE of the PNP determines when the pass transistor begins conducting; this circuit is not short circuit proof. Input-output differential voltage minimum is increased by VBE of the pass transistor.
The circuit of Figure NO TAG can be modified to provide supply protection against short circuits by adding a short circuit sense resistor, Rsc, and an additional PNP transistor. The current sensing PNP must be able to handle the short circuit current of the three-terminal regulator .Therefore, a 4.0 A plastic power transistor is specified.
MOTOROLA ANALOG IC DEVICE DATA
9
MC78M00 MC78M00A Series
OUTLINE DIMENSIONS
T SUFFIX PLASTIC PACKAGE CASE 221A-06 (TO-220) ISSUE Y -T- B
4 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
F T S
C
Q
123
A U K
H Z L V G D N R J
DT SUFFIX PLASTIC PACKAGE CASE 369A-13 (DPAK) ISSUE Y -T- B V R
4 SEATING PLANE NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. INCHES MIN MAX 0.235 0.250 0.250 0.265 0.086 0.094 0.027 0.035 0.033 0.040 0.037 0.047 0.180 BSC 0.034 0.040 0.018 0.023 0.102 0.114 0.090 BSC 0.175 0.215 0.020 0.050 0.020 --- 0.030 0.050 0.138 --- MILLIMETERS MIN MAX 5.97 6.35 6.35 6.73 2.19 2.38 0.69 0.88 0.84 1.01 0.94 1.19 4.58 BSC 0.87 1.01 0.46 0.58 2.60 2.89 2.29 BSC 4.45 5.46 0.51 1.27 0.51 --- 0.77 1.27 3.51 ---
C E
S
1 2 3
A K F L D G
2 PL
Z U
J H 0.13 (0.005) T
DIM A B C D E F G H J K L R S U V Z
M
10
MOTOROLA ANALOG IC DEVICE DATA
MC78M00 MC78M00A Series
OUTLINE DIMENSIONS
DT-1 SUFFIX PLASTIC PACKAGE CASE 369-07 (DPAK) ISSUE L C E
B V R
4
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. DIM A B C D E F G H J K R S V INCHES MIN MAX 0.235 0.250 0.250 0.265 0.086 0.094 0.027 0.035 0.033 0.040 0.037 0.047 0.090 BSC 0.034 0.040 0.018 0.023 0.350 0.380 0.175 0.215 0.050 0.090 0.030 0.050 MILLIMETERS MIN MAX 5.97 6.35 6.35 6.73 2.19 2.38 0.69 0.88 0.84 1.01 0.94 1.19 2.29 BSC 0.87 1.01 0.46 0.58 8.89 9.65 4.45 5.46 1.27 2.28 0.77 1.27
A
1 2 3
S -T-
SEATING PLANE
K
F D G
3 PL M
J H 0.13 (0.005) T
MOTOROLA ANALOG IC DEVICE DATA
11
MC78M00 MC78M00A Series
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/Affirmative Action Employer. Mfax is a trademark of Motorola, Inc. How to reach us: USA / EUROPE / Locations Not Listed: Motorola Literature Distribution; P.O. Box 5405, Denver, Colorado 80217. 1-303-675-2140 or 1-800-441-2447 Customer Focus Center: 1-800-521-6274 MfaxTM: RMFAX0@email.sps.mot.com - TOUCHTONE 1-602-244-6609 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, Motorola Fax Back System - US & Canada ONLY 1-800-774-1848 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852-26629298 - http://sps.motorola.com/mfax/ HOME PAGE: http://motorola.com/sps/ JAPAN: Nippon Motorola Ltd.: SPD, Strategic Planning Office, 4-32-1, Nishi-Gotanda, Shinagawa-ku, Tokyo 141, Japan. 81-3-5487-8488
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MC78M00/D MOTOROLA ANALOG IC DEVICE DATA

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