Device Operating
Temperature Range Package
SEMICONDUCTOR
TECHNICAL DATA
THREE–TERMINAL MEDIUM
CURRENT POSITIVE FIXED
VOLTAGE REGULATORS
ORDERING INFORMATION
MC78MXXCDT
MC78MXXCT TJ = – 40° to +125°C
DPAK
TO–220
Order this document by MC78M00/D
MC78MXXACDT*
XX Indicates nominal voltage.
* Available in 5.0, 8.0, 12 and 15 V devices.
DT–1 SUFFIX
PLASTIC PACKAGE
CASE 369
(DPAK)
DT SUFFIX
PLASTIC PACKAGE
CASE 369A
(DPAK)
Pin 1. Input
2. Ground
3. Output
T SUFFIX
PLASTIC PACKAGE
CASE 221A
(TO–220)
Heatsink surface
connected to Pin 2.
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
3
12
3
1
MC78MXXACT*
3
12
1
MOTOROLA ANALOG IC DEVICE DATA
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
•Previous Commerical Temperature Range has been extended to a
Junction Temperature Range of –40°C to +125°C
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
DEVICE TYPE/NOMINAL OUTPUT VOLTAGE
MC78M05AC 5.0 V MC78M09C 9.0 V MC78M18C 18 V
MC78M05C 5.0 V MC78M12AC 12 V MC78M20C 20 V
MC78M06C 6.0 V MC78M12C 12 V MC78M24C 24 V
MC78M08AC 8.0 V MC78M15AC 15 V
MC78M08C 8.0 V MC78M15C 15 V
Motorola, Inc. 1997 Rev 6
MC78M00 MC78M00A Series
2MOTOROLA ANALOG IC DEVICE DATA
MAXIMUM RATINGS (TA = 25°C, unless otherwise noted.)
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
NOTE: ESD data available upon request.
MC78M05C/AC ELECTRICAL CHARACTERISTICS (VI = 10 V, IO = 350 mA, –40°C < TJ < 125°C, PD ≤ 5.0 W,
unless otherwise noted.)
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 5.0 mV
(TJ = 25°C, 7.0 Vdc ≤ VI ≤ 25 Vdc, IO = 200 mA)
Load Regulation Regload mV
(TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA) – 20 100
(TJ = 25°C, 5.0 mA ≤ IO ≤ 500 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)
MC78M00 MC78M00A Series
3
MOTOROLA ANALOG IC DEVICE DATA
MC78M06C ELECTRICAL CHARACTERISTICS (VI = 11 V, IO = 350 mA, –40°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 ELECTRICAL CHARACTERISTICS (VI = 14 V, IO = 350 mA, –40°C < TJ < 125°C, PD ≤ 5.0 W,
unless otherwise noted.)
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)
MC78M00 MC78M00A Series
4MOTOROLA ANALOG IC DEVICE DATA
MC78M09C ELECTRICAL CHARACTERISTICS (VI = 15 V, IO = 350 mA, –40°C < TJ < 125°C, PD ≤ 5.0 W , unless otherwise noted.)
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 ELECTRICAL CHARACTERISTICS (VI = 19 V, IO = 350 mA, –40°C < TJ < 125°C, PD ≤ 5.0 W,
unless otherwise noted.)
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)
MC78M00 MC78M00A Series
5
MOTOROLA ANALOG IC DEVICE DATA
MC78M15C/AC ELECTRICAL CHARACTERISTICS (VI = 23 V, IO = 350 mA, –40°C < TJ < 125°C, PD ≤ 5.0 W,
unless otherwise noted.)
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, –40°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)
MC78M00 MC78M00A Series
6MOTOROLA ANALOG IC DEVICE DATA
MC78M20C ELECTRICAL CHARACTERISTICS (VI = 29 V, IO = 350 mA, –30°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, –40°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)
MC78M00 MC78M00A Series
7
MOTOROLA ANALOG IC DEVICE DATA
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
Figure 2. Worst Case Power Dissipation
versus Ambient Temperature (TO–220)
, POWER DISSIPATION (W)
D
P
θ
JC = 5
°
C/W
PD(max) = 7.52 W
No Heat Sink
θ
HS = 20
°
C/W
θ
HS = 10
°
C/W Infinite Heat
Sink
R , THERMAL RESISTANCE
JA
θ
JUNCTION–T O–AIR ( C/W)
°
L, LENGTH OF COPPER (mm)
PD, MAXIMUM POWER DISSIPATION (W)
R
θ
JA
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
ÎÎÎ
ÎÎÎ
ÎÎÎ
ÎÎÎ
0
0.4
0.8
1.2
1.6
2.0
2.4
Minimum
Size Pad
MC78M00 MC78M00A Series
8MOTOROLA ANALOG IC DEVICE DATA
TJ = 25
°
C
Figure 3. Peak Output Current versus
Dropout Voltage Figure 4. Dropout Voltage versus
Junction Temperature
Figure 5. Ripple Rejection versus Frequency Figure 6. Ripple Rejection versus Output Current
Figure 7. 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
T
J
, 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 8. 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
MC78M00 MC78M00A Series
9
MOTOROLA ANALOG IC DEVICE DATA
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 T ransistor 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.
Figure 9. Current Regulator Figure 10. Adjustable Output Regulator
Figure 11. Current Boost Regulator Figure 12. Current Boost with
Short Circuit Protection
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
5.0
Ω
, 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
µ
FR
IO
MC78M05C
Constant
Current to
Grounded
Load
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
µ
F
10 k
MC1741
7
6
4
1.0 k
0.1
µ
F
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
µ
F
MJ2955 or Equiv.
1.0
µ
F
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.
XX = 2 digits of type number indicating voltage.
1.0
µ
F
MC78MXXC
MJ2955
or Equiv.
Input
Output
RSC
R
2N6049
or Equiv.
VO, 7.0 V to 20 V
Vin–Vout
≥
2.0 V
*
+
MC78M00 MC78M00A Series
10 MOTOROLA ANALOG IC DEVICE DATA
T SUFFIX
PLASTIC PACKAGE
CASE 221A–06
(TO–220)
ISSUE Y
DT SUFFIX
PLASTIC PACKAGE
CASE 369A–13
(DPAK)
ISSUE Y
OUTLINE DIMENSIONS
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
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 0.250 5.97 6.35
B0.250 0.265 6.35 6.73
C0.086 0.094 2.19 2.38
D0.027 0.035 0.69 0.88
E0.033 0.040 0.84 1.01
F0.037 0.047 0.94 1.19
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
R0.175 0.215 4.45 5.46
S0.020 0.050 0.51 1.27
U0.020 ––– 0.51 –––
V0.030 0.050 0.77 1.27
Z0.138 ––– 3.51 –––
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
123
4
MC78M00 MC78M00A Series
11
MOTOROLA ANALOG IC DEVICE DATA
OUTLINE DIMENSIONS
DT–1 SUFFIX
PLASTIC PACKAGE
CASE 369–07
(DPAK)
ISSUE L
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
123
4
V
S
A
K
–T–
SEATING
PLANE
R
B
F
GD3 PL
M
0.13 (0.005) T
C
E
JH
DIM MIN MAX MIN MAX
MILLIMETERSINCHES
A0.235 0.250 5.97 6.35
B0.250 0.265 6.35 6.73
C0.086 0.094 2.19 2.38
D0.027 0.035 0.69 0.88
E0.033 0.040 0.84 1.01
F0.037 0.047 0.94 1.19
G0.090 BSC 2.29 BSC
H0.034 0.040 0.87 1.01
J0.018 0.023 0.46 0.58
K0.350 0.380 8.89 9.65
R0.175 0.215 4.45 5.46
S0.050 0.090 1.27 2.28
V0.030 0.050 0.77 1.27
MC78M00 MC78M00A Series
12 MOTOROLA ANALOG IC DEVICE DATA
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MC78M00/D
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