Semiconductor Components Industries, LLC, 2003
September, 2003 − Rev. 10 1Publication Order Number:
MC78M00/D
MC78M00, MC78M00A
Series
500 mA 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
•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
Figure 1. Representative Schematic Diagram
This device contains 28 active transistors.
1.0 k 1.0 k Input
210
6.7
V16 k 100
200
300
3.6
k
6.4
k
520
6.0 k
2.0 k 3.9 k
6.0
k2.8 k
40
pF
5.6 k
3.0 k
1.0 k
300
20050
13
0.24
Gnd
Output
10 pF
2.6 k
TO−220
T SUFFIX
CASE 221A
1
DPAK
DT SUFFIX
CASE 369C
MARKING
DIAGRAMS
xxxxx = Device Type and Voltage Option Code
A = Assembly Location
L = Wafer Lot
Y = Year
WW = Work Week
23
See detailed ordering and shipping information in the package
dimensions section on page 10 of this data sheet.
ORDERING INFORMATION
Heatsink surface
connected to Pin 2.
Pin 1. Input
2. Ground
3. Output
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
MC
AWLYWW
78MxxXXT
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4xxxxx
ALYWW
xx = Voltage Option
XX = Appropriate Suffix Options
A = Assembly Location
WL = Wafer Lot
Y = Year
WW = Work Week
See general marking information in the device marking
section on page 10 of this data sheet.
DEVICE MARKING INFORMATION
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MAXIMUM RATINGS (TA = 25°C, unless otherwise noted.) (Note 1)
Rating Symbol Value Unit
Input Voltage (5.0 V−18 V) VI35 Vdc
(20 V−24V) 40
Power Dissipation (Package Limitation)
Plastic Package, T Suffix
TA = 25°C PDInternally Limited
Thermal Resistance, Junction−to−Air θJA 70 °C/W
Thermal Resistance, Junction−to−Case θJC 5.0 °C/W
Plastic Package, DT Suffix
TA = 25°C PDInternally Limited
Thermal Resistance, Junction−to−Air θJA 92 °C/W
Thermal Resistance, Junction−to−Case θJC 5.0 °C/W
Operating Junction Temperature Range TJ+150 °C
Storage Temperature Range Tstg −65 to +150 °C
1. This device series contains ESD protection and exceeds the following tests:
Human Body Model 2000 V per MIL−STD−883, Method 3015.
Machine Model Method 200 V.
MC78M05C/AC/B/AB ELECTRICAL CHARACTERISTICS (VI = 10 V, IO = 350 mA, TJ = Tlow to Thigh, PD ≤ 5.0 W,
unless otherwise noted.) (Note 2)
Characteristics Symbol Min Typ Max Unit
Output Voltage (TJ = 25°C) VOVdc
MC78M05C 4.8 5.0 5.2
MC78M05AC 4.9 5.0 5.1
Output Voltage Variation VOVdc
(7.0 Vdc ≤ VI ≤ 20 Vdc, 5.0 mA ≤ IO ≤ 350 mA)
MC78M05C 4.75 − 5.25
MC78M05AC 4.80 − 5.20
Line Regulation Regline − 3.0 50 mV
(TJ = 25°C, 7.0 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA)
Load Regulation Regload mV
(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) − 20 100
(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) − 10 50
Input Bias Current (TJ = 25°C) IIB − 3.2 6.0 mA
Quiescent Current Change ∆IIB mA
(8.0 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA) − − 0.8
(5.0 mA ≤ IO ≤ 350 mA) − − 0.5
Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) Vn− 40 − µV
Ripple Rejection RR dB
(IO = 100 mA, f = 120 Hz, 8.0 V ≤VI ≤ 18 V) 62 − −
(IO = 300 mA, f = 120 Hz, 8.0 ≤ VI ≤ 18 V, TJ = 25°C) 62 80 −
Dropout Voltage VI−VO− 2.0 − Vdc
(TJ = 25°C)
Short Circuit Current Limit (TJ = 25°C, VI = 35 V) IOS − 50 − mA
Average Temperature Coefficient of Output Voltage ∆VO/∆T − ±0.2 − mV/°C
(IO = 5.0 mA)
Peak Output Current IO− 700 − mA
(TJ = 25°C)
2. Tlow =0°C for MC78MxxAC, C Thigh = +125°C for MC78MxxAB, AC, B, C
= −40°C for MC78MxxAB, B
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MC78M06C ELECTRICAL CHARACTERISTICS (VI = 11 V, IO = 350 mA, 0°C < TJ < 125°C, PD ≤ 5.0 W, unless otherwise noted.)
Characteristics Symbol Min Typ Max Unit
Output Voltage (TJ = 25°C) VO5.75 6.0 6.25 Vdc
Output Voltage Variation VO5.7 − 6.3 Vdc
(8.0 Vdc ≤ VI ≤ 21 Vdc, 5.0 mA ≤ IO ≤ 350 mA)
Line Regulation Regline − 5.0 50 mV
(TJ = 25°C, 8.0 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA)
Load Regulation Regload mV
(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) − 20 120
(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) − 10 60
Input Bias Current (TJ = 25°C) IIB − 3.2 6.0 mA
Quiescent Current Change ∆IIB mA
(9.0 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA) − − 0.8
(5.0 mA ≤ IO ≤ 350 mA) − − 0.5
Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) Vn− 45 − µV
Ripple Rejection RR dB
(IO = 100 mA, f = 120 Hz, 9.0 V ≤VI ≤ 19 V) 59 − −
(IO = 300 mA, f = 120 Hz, 9.0 V ≤VI ≤ 19 V, TJ = 25°C) 59 80 −
Dropout Voltage VI − VO− 2.0 − Vdc
(TJ = 25°C)
Short Circuit Current Limit (TJ = 25°C, VI = 35 V) IOS − 50 − mA
Average Temperature Coefficient of Output Voltage ∆VO/∆T − ±0.2 − mV/°C
(IO = 5.0 mA)
Peak Output Current IO− 700 − mA
(TJ = 25°C)
MC78M08C/AC/B/AB ELECTRICAL CHARACTERISTICS (VI = 14 V, IO = 350 mA, TJ = Tlow to Thigh, PD ≤ 5.0 W,
unless otherwise noted.) (Note 3)
Characteristics Symbol Min Typ Max Unit
Output Voltage (TJ = 25°C) VOVdc
MC78M08C 7.70 8.0 8.30
MC78M08AC 7.84 8.0 8.16
Output Voltage Variation VOVdc
(10.5 Vdc ≤ VI ≤ 23 Vdc, 5.0 mA ≤ IO ≤ 350 mA)
MC78M08C 7.6 − 8.4
MC78M08AC 7.7 − 8.3
Line Regulation Regline − 6.0 50 mV
(TJ = 25°C, 10.5 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA)
Load Regulation Regload mV
(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) − 25 160
(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) − 10 80
Input Bias Current (TJ = 25°C) IIB − 3.2 6.0 mA
Quiescent Current Change ∆IIB mA
(10.5 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA) − − 0.8
(5.0 mA ≤ IO ≤ 350 mA) − − 0.5
Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) Vn− 52 − µV
Ripple Rejection RR dB
(IO = 100 mA, f = 120 Hz, 11.5 V ≤VI ≤ 21.5 V) 56 − −
(IO = 300 mA, f = 120 Hz, 11.5 V ≤VI ≤ 21.5 V, TJ = 25°C) 56 80 −
Dropout Voltage VI−VO− 2.0 − Vdc
(TJ = 25°C)
Short Circuit Current Limit (TJ = 25°C, VI = 35 V) IOS − 50 − mA
Average Temperature Coefficient of Output Voltage ∆VO/∆T − ±0.2 − mV/°C
(IO = 5.0 mA)
Peak Output Current IO− 700 − mA
(TJ = 25°C)
3. Tlow =0°C for MC78MxxAC, C Thigh = +125°C for MC78MxxAB, AC, B, C
= −40°C for MC78MxxAB, B
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MC78M09C/B ELECTRICAL CHARACTERISTICS (VI = 15 V, IO = 350 mA, TJ = Tlow to Thigh, PD ≤ 5.0 W, unless otherwise noted.)
(Note 4)
Characteristics Symbol Min Typ Max Unit
Output Voltage (TJ = 25°C) VO8.64 9.0 9.45 Vdc
Output Voltage Variation VO8.55 − 9.45 Vdc
(11.5 Vdc ≤ VI ≤ 23 Vdc, 5.0 mA ≤ IO ≤ 350 mA)
Line Regulation Regline − 6.0 50 mV
(TJ = 25°C, 11.5 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA)
Load Regulation Regload mV
(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) − 25 180
(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) − 10 90
Input Bias Current (TJ = 25°C) IIB − 3.2 6.0 mA
Quiescent Current Change ∆IIB mA
(11.5 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA) − − 0.8
(5.0 mA ≤ IO ≤ 350 mA) − − 0.5
Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) Vn− 52 − µV
Ripple Rejection RR dB
(IO = 100 mA, f = 120 Hz, 12.5 V ≤VI ≤ 22.5 V) 56 − −
(IO = 300 mA, f = 120 Hz, 12.5 V ≤VI ≤ 22.5 V, TJ = 25°C) 56 80 −
Dropout Voltage VI−VO− 2.0 − Vdc
(TJ = 25°C)
Short Circuit Current Limit (TJ = 25°C, VI = 35 V) IOS − 50 − mA
Average Temperature Coefficient of Output Voltage ∆VO/∆T − ±0.2 − mV/°C
(IO = 5.0 mA)
Peak Output Current IO− 700 − mA
(TJ = 25°C)
MC78M12C/AC/B/AB ELECTRICAL CHARACTERISTICS (VI = 19 V, IO = 350 mA, TJ = Tlow to Thigh, PD ≤ 5.0 W,
unless otherwise noted.) (Note 4)
Characteristics Symbol Min Typ Max Unit
Output Voltage (TJ = 25°C) VOVdc
MC78M12C 11.50 12 12.50
MC78M12AC 11.76 12 12.24
Output Voltage Variation VOVdc
(14.5 Vdc ≤ VI ≤ 27 Vdc, 5.0 mA ≤ IO ≤ 350 mA)
MC78M12C 11.4 − 12.6
MC78M12AC 11.5 − 12.5
Line Regulation Regline − 8.0 50 mV
(TJ = 25°C, 14.5 Vdc ≤ VI ≤ 30 Vdc, IO = 200 mA)
Load Regulation Regload mV
(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) − 25 240
(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) − 10 120
Input Bias Current (TJ = 25°C) IIB − 3.2 6.0 mA
Quiescent Current Change ∆IIB mA
(14.5 Vdc ≤ VI ≤ 30 Vdc, IO = 200 mA) − − 0.8
(5.0 mA ≤ IO ≤ 350 mA) − − 0.5
Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) Vn− 75 − µV
Ripple Rejection RR dB
(IO = 100 mA, f = 120 Hz, 15 V ≤VI ≤ 25 V) 55 − −
(IO = 300 mA, f = 120 Hz, 15 V ≤VI ≤ 25 V, TJ = 25°C) 55 80 −
Dropout Voltage VI−VO− 2.0 − Vdc
(TJ = 25°C)
Short Circuit Current Limit (TJ = 25°C, VI = 35 V) IOS − 50 − mA
Average Temperature Coefficient of Output Voltage ∆VO/∆T − ±0.3 − mV/°C
(IO = 5.0 mA)
Peak Output Current IO− 700 − mA
(TJ = 25°C)
4. Tlow =0°C for MC78MxxAC, C Thigh = +125°C for MC78MxxAB, AC, B, C
= −40°C for MC78MxxAB, B
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MC78M15C/AC/B/AB ELECTRICAL CHARACTERISTICS (VI = 23 V, IO = 350 mA, TJ = Tlow to Thigh, PD ≤ 5.0 W,
unless otherwise noted.) (Note 5)
Characteristics Symbol Min Typ Max Unit
Output Voltage (TJ = 25°C) VOVdc
MC78M15C 14.4 15 15.6
MC78M15AC 14.7 15 15.3
Output Voltage Variation VOVdc
(17.5 Vdc ≤ VI ≤ 30 Vdc, 5.0 mA ≤ IO ≤ 350 mA)
MC78M15C 14.25 − 15.75
MC78M15AC 14.40 − 15.60
Input Regulation Regline − 10 50 mV
(TJ = 25°C, 17.5 Vdc ≤ VI ≤ 30 Vdc, IO = 200 mA)
Load Regulation Regload mV
(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) − 25 300
(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) − 10 150
Input Bias Current (TJ = 25°C) IIB − 3.2 6.0 mA
Quiescent Current Change ∆IIB mA
(17.5 Vdc ≤ VI ≤ 30 Vdc, IO = 200 mA) − − 0.8
(5.0 mA ≤ IO ≤ 350 mA) − − 0.5
Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) Vn− 90 − µV
Ripple Rejection RR dB
(IO = 100 mA, f = 120 Hz, 18.5 V ≤VI ≤ 28.5 V) 54 − −
(IO = 300 mA, f = 120 Hz, 18.5 V ≤VI ≤ 28.5 V, TJ = 25°C) 54 70 −
Dropout Voltage VI−VO− 2.0 − Vdc
(TJ = 25°C)
Short Circuit Current Limit (TJ = 25°C, VI = 35 V) IOS − 50 − mA
Average Temperature Coefficient of Output Voltage ∆VO/∆T − ±0.3 − mV/°C
(IO = 5.0 mA)
Peak Output Current IO− 700 − mA
(TJ = 25°C)
MC78M18C ELECTRICAL CHARACTERISTICS (VI = 27 V, IO = 350 mA, 0°C < TJ < 125°C, PD ≤ 5.0 W, unless otherwise noted.)
Characteristics Symbol Min Typ Max Unit
Output Voltage (TJ = 25°C) VO17.3 18 18.7 Vdc
Output Voltage Variation VO17.1 − 18.9 Vdc
(21 Vdc ≤ VI ≤ 33 Vdc, 5.0 mA ≤ IO ≤ 350 mA)
Line Regulation Regline − 10 50 mV
(TJ = 25°C, 21 Vdc ≤ VI ≤ 33 Vdc, IO = 200 mA)
Load Regulation Regload mV
(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) − 30 360
(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) − 10 180
Input Bias Current (TJ = 25°C) IIB − 3.2 6.5 mA
Quiescent Current Change ∆IIB mA
(21 Vdc ≤ VI ≤ 33 Vdc, IO = 200 mA) − − 0.8
(5.0 mA ≤ IO ≤ 350 mA) − − 0.5
Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) Vn− 100 − µV
Ripple Rejection RR dB
(IO = 100 mA, f = 120 Hz, 22 V ≤VI ≤ 32 V) 53 − −
(IO = 300 mA, f = 120 Hz, 22 V ≤VI ≤ 32 V, TJ = 25°C) 53 70 −
Dropout Voltage VI−VO− 2.0 − Vdc
(TJ = 25°C)
Short Circuit Current Limit (TJ = 25°C, VI = 35 V) IOS − 50 − mA
Average Temperature Coefficient of Output Voltage ∆VO/∆T − ±0.3 − mV/°C
(IO = 5.0 mA)
Peak Output Current IO− 700 − mA
(TJ = 25°C)
5. Tlow =0°C for MC78MxxAC, C Thigh = +125°C for MC78MxxAB, AC, B, C
= −40°C for MC78MxxAB, B
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MC78M20C ELECTRICAL CHARACTERISTICS (VI = 29 V, IO = 350 mA, 0°C < TJ < 125°C, PD ≤ 5.0 W, unless otherwise noted.)
Characteristics Symbol Min Typ Max Unit
Output Voltage (TJ = 25°C) VO19.2 20 20.8 Vdc
Output Voltage Variation VO19 − 21 Vdc
(23 Vdc ≤ VI ≤ 35 Vdc, 5.0 mA ≤ IO ≤ 350 mA)
Line Regulation Regline − 10 50 mV
(TJ = 25°C, 23 Vdc ≤ VI ≤ 35 Vdc, IO = 200 mA)
Load Regulation Regload mV
(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) − 30 400
(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) − 10 200
Input Bias Current (TJ = 25°C) IIB − 3.2 6.5 mA
Quiescent Current Change ∆IIB mA
(23 Vdc ≤ VI ≤ 35 Vdc, IO = 200 mA) − − 0.8
(5.0 mA ≤ IO ≤ 350 mA) − − 0.5
Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) Vn−110 −µV
Ripple Rejection RR dB
(IO = 100 mA, f = 120 Hz, 24 V ≤VI ≤ 34 V) 52 − −
(IO = 300 mA, f = 120 Hz, 24 V ≤VI ≤ 34 V, TJ = 25°C) 52 70 −
Dropout Voltage VI−VO− 2.0 − Vdc
(TJ = 25°C)
Short Circuit Current Limit (TJ = 25°C, VI = 35 V) IOS − 50 − mA
Average Temperature Coefficient of Output Voltage ∆VO/∆T − ±0.5 − mV/°C
(IO = 5.0 mA)
Peak Output Current IO− 700 − mA
(TJ = 25°C)
MC78M24C ELECTRICAL CHARACTERISTICS (VI = 33 V, IO = 350 mA, 0°C < TJ < 125°C, PD ≤ 5.0 W, unless otherwise noted.)
Characteristics Symbol Min Typ Max Unit
Output Voltage (TJ = 25°C) VO23 24 25 Vdc
Output Voltage Variation VO22.8 − 25.2 Vdc
(27 Vdc ≤ VI ≤ 38 Vdc, 5.0 mA ≤ IO ≤ 350 mA)
Line Regulation Regline − 10 50 mV
(TJ = 25°C, 27 Vdc ≤ VI ≤ 38 Vdc, IO = 200 mA)
Load Regulation Regload mV
(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA) − 30 480
(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) − 10 240
Input Bias Current (TJ = 25°C) IIB − 3.2 7.0 mA
Quiescent Current Change ∆IIB mA
(27 Vdc ≤ VI ≤ 38 Vdc, IO = 200 mA) − − 0.8
(5.0 mA ≤ IO ≤ 350 mA) − − 0.5
Output Noise Voltage (TA = 25°C, 10 Hz ≤ f ≤ 100 kHz) Vn− 170 − µV
Ripple Rejection RR dB
(IO = 100 mA, f = 120 Hz, 28 V ≤VI ≤ 38 V) 50 − −
(IO = 300 mA, f = 120 Hz, 28 V ≤VI ≤ 38 V, TJ = 25°C) 50 70 −
Dropout Voltage VI−VO− 2.0 − Vdc
(TJ = 25°C)
Short Circuit Current Limit (TJ = 25°C) IOS − 50 − mA
Average Temperature Coefficient of Output Voltage ∆VO/∆T − ±0.5 − mV/°C
(IO = 5.0 mA)
Peak Output Current IO− 700 − mA
(TJ = 25°C)
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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 2. DPAK Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
Figure 3. Worst Case Power Dissipation
versus Ambient Temperature (TO−220)
, POWER DISSIPATION (W)
D
P
θJC = 5°C/W
PD(max) = 7.52 W
No Heat Sink
θHS = 20°C/W
θHS = 10°C/W Infinite Heat
Sink
R , THERMAL RESISTANCE
JAθ
JUNCTION−TO−AIR ( C/W)°
L, LENGTH OF COPPER (mm)
PD, MAXIMUM POWER DISSIPATION (W)
RθJA
10
5.0
3.0
2.0
1.0
0.5
0.3
0.2
0.1
40
50
60
70
80
90
100
TA, AMBIENT TEMPERATURE (°C)
25 50 75 100 125 150
0 10203025155.0
L
L
Free Air
Mounted
Vertically 2.0 oz. Copper
PD(max) for TA = 50°C
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
0
0.4
0.8
1.2
1.6
2.0
2.4
Minimum
Size Pad
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TJ = 25°C
Figure 4. Peak Output Current versus
Dropout Voltage Figure 5. Dropout Voltage versus
Junction Temperature
Figure 6. Ripple Rejection versus Frequency Figure 7. Ripple Rejection versus Output Current
Figure 8. Bias Current versus Input Voltage
100
80
60
40
20
1.0 10 100 1.0 k 10 k 100 k 1.0 M 10 M 100 M
f, FREQUENCY (Hz)
RR, RIPPLE REJECTION (dB)
Iout = 500 mA
, DROPOUT VOLTAGE (V)
IO
TJ, JUNCTION TEMPERATURE (°C)
2.5
2.0
1.5
1.0
0.5
00 25 50 75 100 125 150
−VV
∆VO = 100 mV
IO = 500 mA
IO = 100 mA
IO = 10 mA
RR, RIPPLE REJECTION (dB)
IO, OUTPUT CURRENT (A)
100
80
60
40
30
0.01 0.1 0.5 1.0 10
Vout = 5.0 V
Vin = 10 V
CO = 0
f = 120 Hz
TJ = 25°C
, BIAS CURRENT (mA)
B
VI, INPUT VOLTAGE (Vdc)
4.0
3.0
2.0
1.0
00 5.0 10 15 20 25 30 35 40
I
TJ = 25°C
TJ = 125°C
TJ = 125°C
TJ = 25°C
VO = 5.0 V
IO = 0.5 A
IO, OUTPUT CURRENT (A)
5.0
4.0
3.0
2.0
1.0
0
0.01 0.1 0.5 1.0 10
TJ = 125°C
VI−VO = 5.0 V
Figure 9. Bias Current versus Output Current
, OUTPUT CURRENT (A)
O
VI − VO, DROPOUT VOLTAGE (V)
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
00 5.0 10 15 20 25 30 35 40
TJ = 125°C
TJ = 25°C
I
, BIAS CURRENT (mA)
B
I
Iout = 500 mA
Vout = 5.0 V
Vin = 10 V
CO = 0
TJ = 25°C
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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 µF 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.
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.
Input MC78M05C
Output
0.33 µF
10 k
MC1741
7
6
4
1.0 k
0.1 µF
3
2
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.
XX = 2 digits of type number indicating voltage.
MC78MXXC
Input
Output
R
1.0 µF
MJ2955 or Equiv.
1.0 µF
The circuit of Figure 12 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.
XX = 2 digits of type number indicating voltage.
1.0 µF
MC78MXXC
MJ2955
or Equiv.
Input
Output
RSC
R
2N6049
or Equiv.
VO, 7.0 V to 20 V
Vin−Vout ≥ 2.0 V
+
Figure 10. Current Regulator
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:
For example, a 500 mA current source would require R to be a
5.0Ω, 10 W resistor and the output voltage compliance would
be the input voltage less 7.0 V.
IO = 5.0 V
R+ IIB
IIB = 1.5 mA over line and load changes.
Input
0.33 µFR
IO
MC78M05C
Constant
Current to
Grounded
Load
Figure 11. Adjustable Output Regulator
Figure 12. Current Boost Regulator Figure 13. Current Boost with
Short Circuit Protection
MC78M00, MC78M00A Series
http://onsemi.com
10
ORDERING INFORMATION
Shipping
Device Output
Voltage Temperature Range Package Marking Rails
(No Suffix) Tape & Reel
(RK Suffix)
MC78M05CDT/RK
DPAK
78M05
75 Units/Rail
2500 Units/Reel
MC78M05ACDT/RK
T 0°to +125°C
DPAK 8M05D 75 Units/Rail 2500 Units/Reel
MC78M05CT TJ = 0° to +125°C
TO 220
78M05CT
50 Units/Rail
MC78M05ACT
50V
TO−220 78M05ACT 50 Units/Rail −
MC78M05ABDT/RK 5.0 V DPAK 8M05A 75 Units/Rail 2500 Units/Reel
MC78M05ABT
T=40°to +125°C
TO−220 78M05ABT 50 Units/Rail −
MC78M05BDT/RK TJ = −40° to +125°CDPAK 8M05B 75 Units/Rail 2500 Units/Reel
MC78M05BT TO−220 78M05BT 50 Units/Rail −
MC78M06CDT/RK
T=0°to +125°C
DPAK 78M06 75 Units/Rail 2500 Units/Reel
MC78M06CT 6.0 V TJ = 0° to +125°C
TO 220
78M06CT
50 Units/Rail
MC78M06BT
60
TJ = −40° to +125°CTO−220 78M06BT 50 Units/Rail −
MC78M08CDT/RK
DPAK
78M08
75 Units/Rail
2500 Units/Reel
MC78M08ACDT/RK
T=0°to +125°C
DPAK 8M08D 75 Units/Rail 2500 Units/Reel
MC78M08CT TJ = 0° to +125°C
TO 220
78M08CT
50 Units/Rail
MC78M08ACT
80V
TO−220 78M08ACT 50 Units/Rail −
MC78M08ABDT/RK 8.0 V DPAK 8M08A 75 Units/Rail 2500 Units/Reel
MC78M08ABT
T40°to +125°C
TO−220 78M08ABT 50 Units/Rail −
MC78M08BDT/RK TJ = −40° to +125°CDPAK 8M08B 75 Units/Rail 2500 Units/Reel
MC78M08BT TO−220 78M08BT 50 Units/Rail −
MC78M09CDT/RK
T=0°to +125°C
DPAK 78M09 75 Units/Rail 2500 Units/Reel
MC78M09CT
90V
TJ = 0° to +125°CTO−220 78M09CT 50 Units/Rail −
MC78M09BDT/RK 9.0 V
T40°to +125°C
DPAK 8M09B 75 Units/Rail 2500 Units/Reel
MC78M09BT TJ = −40° to +125°CTO−220 78M09BT 50 Units/Rail −
MC78M12CDT/RK
DPAK
78M12
75 Units/Rail
2500 Units/Reel
MC78M12ACDT/RK
T=0°to +125°C
DPAK 8M12D 75 Units/Rail 2500 Units/Reel
MC78M12CT TJ = 0° to +125°C
TO 220
78M12CT
50 Units/Rail
MC78M12ACT
12 V
TO−220 78M12ACT 50 Units/Rail −
MC78M12ABDT/RK 12 V DPAK 8M12A 75 Units/Rail 2500 Units/Reel
MC78M12ABT
T=40°to +125°C
TO−220 78M12ABT 50 Units/Rail −
MC78M12BDT/RK TJ = −40° to +125°CDPAK 8M12B 75 Units/Rail 2500 Units/Reel
MC78M12BT TO−220 78M12BT 50 Units/Rail −
MC78M15CDT/RK
DPAK
78M15
75 Units/Rail
2500 Units/Reel
MC78M15ACDT/RK
T=0°to +125°C
DPAK 8M15D 75 Units/Rail 2500 Units/Reel
MC78M15CT TJ = 0° to +125°C
TO 220
78M15CT
50 Units/Rail
MC78M15ACT
15 V
TO−220 78M15ACT 50 Units/Rail −
MC78M15ABDT/RK 15 V DPAK 8M15A 75 Units/Rail 2500 Units/Reel
MC78M15ABT
T40°to +125°C
TO−220 78M15ABT 50 Units/Rail −
MC78M15BDT/RK TJ = −40° to +125°CDPAK 8M15B 75 Units/Rail 2500 Units/Reel
MC78M15BT TO−220 78M15BT 50 Units/Rail
MC78M18CDT
T=0°to +125°C
DPAK 78M18 75 Units/Rail
MC78M18CT 18 V TJ = 0° to +125°C78M18CT
MC78M18BT
8
TJ = −40° to +125°C78M18BT
MC78M20CT
20 V
TJ = 0° to +125°C
TO 220
78M20CT
50 Units/Rail
−
MC78M20BT 20 V TJ = −40° to +125°CTO−220 78M20BT 50 Units/Rail
MC78M24CT
24 V
TJ = 0° to +125°C78M24CT
MC78M24BT 24 V TJ = −40° to +125°C78M24BT
MC78M00, MC78M00A Series
http://onsemi.com
11
PACKAGE DIMENSIONS
TO−220
T SUFFIX
CASE 221A−09
ISSUE AA
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 MIN MAX MIN MAX
MILLIMETERSINCHES
A0.570 0.620 14.48 15.75
B0.380 0.405 9.66 10.28
C0.160 0.190 4.07 4.82
D0.025 0.035 0.64 0.88
F0.142 0.147 3.61 3.73
G0.095 0.105 2.42 2.66
H0.110 0.155 2.80 3.93
J0.018 0.025 0.46 0.64
K0.500 0.562 12.70 14.27
L0.045 0.060 1.15 1.52
N0.190 0.210 4.83 5.33
Q0.100 0.120 2.54 3.04
R0.080 0.110 2.04 2.79
S0.045 0.055 1.15 1.39
T0.235 0.255 5.97 6.47
U0.000 0.050 0.00 1.27
V0.045 −−− 1.15 −−−
Z−−− 0.080 −−− 2.04
B
Q
H
Z
L
V
G
N
A
K
F
123
4
D
SEATING
PLANE
−T−
C
S
T
U
R
J
DPAK
DT SUFFIX
CASE 369C−01
ISSUE O
D
A
K
B
R
V
S
FL
G
2 PL
M
0.13 (0.005) T
E
C
U
J
H
−T− SEATING
PLANE
Z
DIM MIN MAX MIN MAX
MILLIMETERSINCHES
A0.235 0.245 5.97 6.22
B0.250 0.265 6.35 6.73
C0.086 0.094 2.19 2.38
D0.027 0.035 0.69 0.88
E0.018 0.023 0.46 0.58
F0.037 0.045 0.94 1.14
G0.180 BSC 4.58 BSC
H0.034 0.040 0.87 1.01
J0.018 0.023 0.46 0.58
K0.102 0.114 2.60 2.89
L0.090 BSC 2.29 BSC
R0.180 0.215 4.57 5.45
S0.025 0.040 0.63 1.01
U0.020 −−− 0.51 −−−
V0.035 0.050 0.89 1.27
Z0.155 −−− 3.93 −−−
NOTES:
1. DIMENSIONING AND TOLERANCING
PER ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
123
4
MC78M00, MC78M00A Series
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12
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