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PDF MC78T12 Data sheet ( Hoja de datos )
| Número de pieza | MC78T12 | |
| Descripción | THREE-AMPERE POSITIVE FIXED VOLTAGE REGULATORS | |
| Fabricantes | ON | |
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MC78T00 Series
3.0 A Positive Voltage
Regulators
This family of fixed voltage regulators are monolithic integrated
circuits capable of driving loads in excess of 3.0 A. These
three−terminal regulators employ internal current limiting, thermal
shutdown, and safe−area compensation. Devices are available with
improved specifications, including a 2% output voltage tolerance, on
AC−suffix 5.0 V, 12 V and 15 V device types.
Although designed primarily as a fixed voltage regulator, these
devices can be used with external components to obtain adjustable
voltages and currents. This series of devices can be used with a
series−pass transistor to supply up to 15 A at the nominal output
voltage.
• Output Current in Excess of 3.0 A
• Power Dissipation: 25 W
• No External Components Required
• Output Voltage Offered in 2% and 4% Tolerance*
• Thermal Regulation is Specified
• Internal Thermal Overload Protection
• Internal Short Circuit Current Limiting
• Output Transistor Safe−Area Compensation
• Pb−Free Packages are Available
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Input
Cin*
0.33 mF
MC78TXX
Output
CO**
Figure 1. Simplified Application
A common ground is required between the input and the output voltages. The input voltage
must remain typically 2.2 V above the output voltage even during the low point on the input
ripple voltage.
XX these two digits of the type number indicate voltage.
** Cin is required if regulator is located an appreciable distance from power supply filter.
** (See Applications Information for details.)
** CO is not needed for stability; however, it does improve transient response.
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3A
POSITIVE FIXED
VOLTAGE REGULATORS
MARKING
DIAGRAMS
TO−220
T SUFFIX
CASE 221A
MC
78TxxyzT
AWLYWW
1
2
3
Pin 1. Input
2. Ground*
3. Output
*Heatsink surface is connected to Pin 2.
D2PAK−3
CASE 936
MC
78TxxyzD2T
AWLYWW
MC = Specific Device Code
xx = Voltage Option
y = “A” letter for precise 2% regulators, not
used for standard 4% regulators.
z = temperature range, “B” for wide
temperature range, −40°C to +125°C, “C”
for standard temperature range,
0°C to +125°C.
A = Assembly Location
WL= Wafer Lot
Y = Year
W = Work Week
© Semiconductor Components Industries, LLC, 2004
March, 2004 − Rev. 4
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 10 of this data sheet.
1 Publication Order Number:
MC78T00/D
1 page  
MC78T00 Series
ELECTRICAL CHARACTERISTICS (Vin = 20 V, IO = 3.0 A, 0°C ≤ TJ ≤ 125°C, PO ≤ Pmax (Note 8), unless otherwise noted.)
MC78T15AC
MC78T15C
Characteristics
Symbol Min Typ Max Min Typ Max Unit
Output Voltage
(5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C)
(5.0 mA ≤ IO ≤ 3.0 A;
5.0 mA ≤ IO ≤ 2.0 A, 17.5 Vdc ≤ Vin ≤ 30 Vdc)
VO Vdc
14.7 15 15.3 14.4 15 15.6
14.4 15 15.6 14.25 15 15.75
Line Regulation (Note 9)
Regline
−
7.5 55
−
7.5 55 mV
(17.6 Vdc ≤ Vin ≤ 40 Vdc, IO = 5.0 mA, TJ = +25°C;
17.6 Vdc ≤ Vin ≤ 40 Vdc, IO = 1.0 A, TJ = +25°C;
20 Vdc ≤ Vin ≤ 26 Vdc, IO = 3.0 A, TJ = +25°C;
18 Vdc ≤ Vin ≤ 30 Vdc, IO = 1.0 A)
Load Regulation (Note 9)
(5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C)
(5.0 mA ≤ IO ≤ 3.0 A)
Regload
mV
− 10 30 − 10 30
− 15 80 − 15 80
Thermal Regulation
(Pulse = 10 ms, P = 20 W, TA = +25°C)
Quiescent Current
(5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C)
(5.0 mA ≤ IO ≤ 3.0 A)
Regtherm
IB
−
−
−
0.001 0.01
3.5 5.0
4.0 6.0
− 0.002 0.03 %VO/W
mA
− 3.5 5.0
− 4.0 6.0
Quiescent Current Change
(17.6 Vdc ≤ Vin ≤ 40 Vdc, IO = 5.0 mA, TJ = +25°C;
5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C;
18 Vdc ≤ Vin ≤ 30 Vdc, IO = 1.0 A)
DIB
− 0.3 1.0 − 0.3 1.0 mA
Ripple Rejection
(18.5 Vdc ≤ Vin ≤ 28.5 Vdc, f = 120 Hz,
IO = 2.0 A, TJ = 25°C)
RR 55 65 − 55 65 − dB
Dropout Voltage (IO = 3.0 A, TJ = +25°C)
Vin−VO
−
2.2 2.5
−
2.2 2.5 Vdc
Output Noise Voltage
(10 Hz ≤ f ≤ 100 kHz, TJ = +25°C)
Vn − 10 − − 10 − mV/VO
Output Resistance (f = 1.0 kHz)
RO − 2.0 − − 20 − mW
Short Circuit Current Limit
(Vin = 40 Vdc, TJ = +25°C)
ISC − 1.0 − − 1.0 − A
Peak Output Current (TJ = +25°C)
Imax − 5.0 − − 5.0 − A
Average Temperature Coefficient of Output Voltage
TCVO
−
0.6
−
(IO = 5.0 mA)
− 0.6 − mV/°C
8. Although power dissipation is internally limited, specifications apply only for PO ≤ Pmax, Pmax = 25 W.
9. Line and load regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account
separately.
Pulse testing with low duty cycle is used.
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5
5 Page 
MC78T00 Series
PACKAGE DIMENSIONS
Q
H
Z
B
4
1 23
F
T
TO−220
T SUFFIX
CASE 221A−09
ISSUE AA
−T−
SEATING
PLANE
C
S
A
U
K
L
V
G
N
D
R
J
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.
INCHES
DIM MIN MAX
A 0.570 0.620
B 0.380 0.405
C 0.160 0.190
D 0.025 0.035
F 0.142 0.147
G 0.095 0.105
H 0.110 0.155
J 0.018 0.025
K 0.500 0.562
L 0.045 0.060
N 0.190 0.210
Q 0.100 0.120
R 0.080 0.110
S 0.045 0.055
T 0.235 0.255
U 0.000 0.050
V 0.045 −−−
Z −−− 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
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