Semiconductor Components Industries, LLC, 2000
April, 2000 – Rev. 7 1Publication Order Number:
MC78M00/D
MC78M00, MC78M00A
Series
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
•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
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
http://onsemi.com
DPAK
DT SUFFIX
CASE 369A
MARKING
DIAGRAMS
xx = Voltage Option
Z = A, B, or C Option
A = Assembly Location
WL, L = W afer Lot
YY, Y = Year
WW, W = 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.
13
8MxxZ
ALYWW
MC
ALYWW
78MxxZT
MC78M00, MC78M00A Series
http://onsemi.com
2
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/B ELECTRICAL CHARACTERISTICS (VI = 10 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) 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 V oltage ∆VO/∆T – ±0.2 – mV/°C
(IO = 5.0 mA)
Peak Output Current IO– 700 – mA
(TJ = 25°C)
MC78M00, MC78M00A Series
http://onsemi.com
3
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 V oltage ∆VO/∆T – ±0.2 – mV/°C
(IO = 5.0 mA)
Peak Output Current IO– 700 – mA
(TJ = 25°C)
MC78M08C/AC/B ELECTRICAL CHARACTERISTICS (VI = 14 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) 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 V oltage ∆VO/∆T – ±0.2 – mV/°C
(IO = 5.0 mA)
Peak Output Current IO– 700 – mA
(TJ = 25°C)
MC78M00, MC78M00A Series
http://onsemi.com
4
MC78M09C/B ELECTRICAL CHARACTERISTICS (VI = 15 V, IO = 35 0 mA, 0°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 V oltage ∆VO/∆T – ±0.2 – mV/°C
(IO = 5.0 mA)
Peak Output Current IO– 700 – mA
(TJ = 25°C)
MC78M12C/AC/B ELECTRICAL CHARACTERISTICS (VI = 19 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) 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 V oltage ∆VO/∆T – ±0.3 – mV/°C
(IO = 5.0 mA)
Peak Output Current IO– 700 – mA
(TJ = 25°C)
MC78M00, MC78M00A Series
http://onsemi.com
5
MC78M15C/AC/B ELECTRICAL CHARACTERISTICS (VI = 23 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) 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 V oltage ∆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 V oltage ∆VO/∆T – ±0.3 – mV/°C
(IO = 5.0 mA)
Peak Output Current IO– 700 – mA
(TJ = 25°C)
MC78M00, MC78M00A Series
http://onsemi.com
6
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 V oltage ∆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 V oltage ∆VO/∆T – ±0.5 – mV/°C
(IO = 5.0 mA)
Peak Output Current IO– 700 – mA
(TJ = 25°C)
MC78M00, MC78M00A Series
http://onsemi.com
7
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
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 TEMPERA TURE ( °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
MC78M00, MC78M00A Series
http://onsemi.com
8
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, R
I
PP
L
E RE
J
E
C
T
IO
N (
d
B)
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 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
http://onsemi.com
9
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 11 can be modified to provide supply protection
against short circuits by adding a short circuit sense resistor , R sc,
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 9. 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
5.0 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 µFR
IO
MC78M05C
Constant
Current to
Grounded
Load
Figure 10. Adjustable Output Regulator
Figure 11. Current Boost Regulator Figure 12. Current Boost with
Short Circuit Protection
MC78M00, MC78M00A Series
http://onsemi.com
10
ORDERING INFORMATION
Shipping
Device Output Voltage Temperature Range Package Rails
(No Suffix) Tape & Reel
(RK Suffix)
MC78M05CDT/RK
DPAK
75 Units/Rail
2500 Units/Reel
MC78M05ACDT/RK
TJ=0
°
to +125
°
C
DPAK
75
Units/Rail
2500
Units/Reel
MC78M05CT
50V
TJ
=
0°
to
+125°C
TO–220
50 Units/Rail
–
MC78M05ACT
5
.
0
V
TO
–
220
50
Units/Rail
–
MC78M05BDT/RK
TJ= –40
°
to +125
°
C
DPAK 75 Units/Rail 2500 Units/Reel
MC78M05BT
TJ
= –
40°
to
+125°C
TO–220 50 Units/Rail –
MC78M06CDT/RK
TJ=0
°
to +125
°
C
DPAK 75 Units/Rail 2500 Units/Reel
MC78M06CT 6.0 V
TJ
=
0°
to
+125°C
TO–220
50 Units/Rail
–
MC78M06BT TJ = –40° to +125°C
TO
–
220
50
Units/Rail
–
MC78M08CDT/RK
DPAK
75 Units/Rail
2500 Units/Reel
MC78M08ACDT/RK
TJ=0
°
to +125
°
C
DPAK
75
Units/Rail
2500
Units/Reel
MC78M08CT
80V
TJ
=
0°
to
+125°C
TO–220
50 Units/Rail
–
MC78M08ACT
8
.
0
V
TO
–
220
50
Units/Rail
–
MC78M08BDT/RK
TJ= –40
°
to +125
°
C
DPAK 75 Units/Rail 2500 Units/Reel
MC78M08BT
TJ
= –
40°
to
+125°C
TO–220 50 Units/Rail –
MC78M09CDT/RK
TJ=0
°
to +125
°
C
DPAK 75 Units/Rail 2500 Units/Reel
MC78M09CT
90V
TJ
=
0°
to
+125°C
TO–220 50 Units/Rail –
MC78M09BDT/RK
9
.
0
V
TJ= –40
°
to +125
°
C
DPAK 75 Units/Rail 2500 Units/Reel
MC78M09BT
TJ
= –
40°
to
+125°C
TO–220 50 Units/Rail –
MC78M12CDT/RK
DPAK
75 Units/Rail
2500 Units/Reel
MC78M12ACDT/RK
TJ=0
°
to +125
°
C
DPAK
75
Units/Rail
2500
Units/Reel
MC78M12CT
12 V
TJ
=
0°
to
+125°C
TO–220
50 Units/Rail
–
MC78M12ACT
12
V
TO
–
220
50
Units/Rail
–
MC78M12BDT/RK
TJ= –40
°
to +125
°
C
DPAK 75 Units/Rail 2500 Units/Reel
MC78M12BT
TJ
= –
40°
to
+125°C
TO–220 50 Units/Rail –
MC78M15CDT/RK
DPAK
75 Units/Rail
2500 Units/Reel
MC78M15ACDT/RK
TJ=0
°
to +125
°
C
DPAK
75
Units/Rail
2500
Units/Reel
MC78M15CT
15 V
TJ
=
0°
to
+125°C
TO–220
50 Units/Rail
–
MC78M15ACT
15
V
TO
–
220
50
Units/Rail
–
MC78M15BDT/RK
TJ= –40
°
to +125
°
C
DPAK 75 Units/Rail 2500 Units/Reel
MC78M15BT
TJ
= –
40°
to
+125°C
TO–220 50 Units/Rail
MC78M18CDT
TJ=0
°
to +125
°
C
DPAK 75 Units/Rail
MC78M18CT 18 V
TJ
=
0°
to
+125°C
MC78M18BT TJ = –40° to +125°C
–
MC78M20CT
20 V
TJ = 0° to +125°C
TO–220
50 Units/Rail
–
MC78M20BT
20
V
TJ = –40° to +125°C
TO
–
220
50
Units/Rail
MC78M24CT
24 V
TJ = 0° to +125°C
MC78M24BT
24
V
TJ = –40° to +125°C
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 369A–13
ISSUE Z
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
http://onsemi.com
12
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 “T ypicals” 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/Af firmative Action Employer.
PUBLICATION ORDERING INFORMATION
CENTRAL/SOUTH AMERICA:
Spanish Phone: 303–308–7143 (Mon–Fri 8:00am to 5:00pm MST)
Email: ONlit–spanish@hibbertco.com
ASIA/PACIFIC: LDC for ON Semiconductor – Asia Support
Phone: 303–675–2121 (Tue–Fri 9:00am to 1:00pm, Hong Kong Time)
Toll Free from Hong Kong & Singapore:
001–800–4422–3781
Email: ONlit–asia@hibbertco.com
JAPAN: ON Semiconductor, Japan Customer Focus Center
4–32–1 Nishi–Gotanda, Shinagawa–ku, Tokyo, Japan 141–8549
Phone: 81–3–5740–2745
Email: r14525@onsemi.com
ON Semiconductor Website : http://onsemi.com
For additional information, please contact your local
Sales Representative.
MC78M00/D
NORTH AMERICA 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
Fax Response Line: 303–675–2167 or 800–344–3810 Toll Free USA/Canada
N. American Technical Support: 800–282–9855 Toll Free USA/Canada
EUROPE: LDC for ON Semiconductor – European Support
German Phone: (+1) 303–308–7140 (M–F 1:00pm to 5:00pm Munich T ime)
Email: ONlit–german@hibbertco.com
French Phone: (+1) 303–308–7141 (M–F 1:00pm to 5:00pm Toulouse T ime)
Email: ONlit–french@hibbertco.com
English Phone: (+1) 303–308–7142 (M–F 12:00pm to 5:00pm UK Time)
Email: ONlit@hibbertco.com
EUROPEAN TOLL–FREE ACCESS*: 00–800–4422–3781
*Available from Germany, France, Italy , England, Ireland
