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부품번호 MC78T12BT 기능
기능 THREE-AMPERE POSITIVE FIXED VOLTAGE REGULATORS
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MC78T12BT 데이터시트, 핀배열, 회로
Order this document by MC78T00/D
Three-Ampere 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, 12 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
MAXIMUM RATINGS (TA = +25°C, unless otherwise noted.)
Rating
Symbol
Value
Unit
Input Voltage (5.0 V – 12 V)
Input Voltage (15 V)
VI 35 Vdc
40
Power Dissipation and Thermal Characteristics
Plastic Package (Note 1)
TA = +25°C
Thermal Resistance, Junction–to–Air
TC = +25°C
Thermal Resistance, Junction–to–Case
Storage Junction Temperature
Operating Junction Temperature Range
(MC78T00C, AC)
PD
RθJA
PD
RθJC
Tstg
TJ
Internally Limited
65 °C/W
Internally Limited
2.5 °C/W
+150
°C
0 to +125
°C
NOTES: 1. Although power dissipation is internally limited, specifications apply only
for PO Pmax, Pmax = 25 W.
MC78T00
Series
THREE–AMPERE
POSITIVE FIXED
VOLTAGE REGULATORS
SEMICONDUCTOR
TECHNICAL DATA
T SUFFIX
PLASTIC PACKAGE
CASE 221A
Pin 1. Input
2. Ground
3. Output
1
2
3
Heatsink surface is connected to Pin 2.
DEVICE TYPE/NOMINAL OUTPUT VOLTAGE
MC78T05
MC78T08
5.0 V
8.0 V
MC78T12
MC78T15
12 V
15 V
ORDERING INFORMATION
Simplified Application
Input
Cin*
0.33µF
MC78TXX
Output
CO**
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.
MOTOROLA ANALOG IC DEVICE DATA
Device
Operating
VO Temperature
Tol. Range Package
MC78TXXCT
4%
MC78TXXACT 2%*
TJ = 0° to
+125°C
Plastic
Power
MC78TXXBT# 4%
MC78TXXABT# 2%*
TJ = – 40° to Plastic
+125°C
Power
XX Indicates nominal voltage.
* 2% regulators available in 5, 12 and 15 V devices.
# Automotive temperature range selections are avail-
able with special test conditions and additional
tests. Contact your local Motorola sales office for
information.
© Motorola, Inc. 1996
Rev 1
1




MC78T12BT pdf, 반도체, 판매, 대치품
MC78T00 Series
ELECTRICAL CHARACTERISTICS (Vin = 17 V, IO = 3.0 A, 0°C TJ 125°C, PO Pmax [Note 1], unless otherwise noted.)
MC78T12AC
MC78T12C
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, 14.5 Vdc Vin 27 Vdc)
VO Vdc
11.75 12 12.25 11.5 12 12.5
11.5 12 12.5 11.4 12 12.6
Line Regulation (Note 2)
Regline
6.0 45
6.0 45 mV
(14.5 Vdc Vin 35 Vdc, IO = 5.0 mA, TJ = +25°C;
14.5 Vdc Vin 35 Vdc, IO = 1.0 A, TJ = +25°C;
16 Vdc Vin 22 Vdc, IO = 3.0 A, TJ = +25°C;
14.9 Vdc Vin 27 Vdc, IO = 1.0 A)
Load Regulation (Note 2)
(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)
Regtherm – 0.001 0.01
– 0.002 0.03 %VO/W
Quiescent Current
(5.0 mA IO 3.0 A, TJ = +25°C)
(5.0 mA IO 3.0 A)
IB mA
– 3.5 5.0 – 3.5 5.0
– 4.0 6.0 – 4.0 6.0
Quiescent Current Change
(14.5 Vdc Vin 35 Vdc, IO = 5.0 mA, TJ = +25°C;
5.0 mA IO 3.0 A, TJ = +25°C;
14.9 Vdc Vin 27 Vdc, IO = 1.0 A)
IB
– 0.3 1.0 – 0.3 1.0 mA
Ripple Rejection
(15 Vdc Vin 25 Vdc, f = 120 Hz,
IO = 2.0 A, TJ = 25°C)
RR 57 67 – 57 67 – 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 – µV/VO
Output Resistance (f = 1.0 kHz)
Short Circuit Current Limit
(Vin = 35 Vdc, TJ = +25°C)
RO
– 2.0 –
– 20 – m
ISC
– 1.5 –
– 1.5 –
A
Peak Output Current (TJ = +25°C)
Average Temperature Coefficient
of Output Voltage (IO = 5.0 mA)
Imax
– 5.0 –
TCVO – 0.5 –
– 5.0 –
A
– 0.5 – mV/°C
NOTES: 1. Although power dissipation is internally limited, specifications apply only for PO Pmax, Pmax = 25 W.
2. 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.
4 MOTOROLA ANALOG IC DEVICE DATA

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MC78T12BT 전자부품, 판매, 대치품
MC78T00 Series
Figure 3. Temperature Stability
1.02
Vin – Vout = 10 V
Iout = 100 mA
1.0
.98
–90
–50 –10 30 70 110 150
TJ, JUNCTION TEMPERATURE (°C)
190
Figure 4. Output Impedance
100
10–1
Vout = 5.0 V
Vin = 7.5 V
10–2 Iout = 1.0 A
CO = 0
TJ = 25°C
10–3
10–4
1.0
10 100 1.0 k 10 k 100 k 1.0 M 10 M 100 M
f, FREQUENCY (Hz)
Figure 5. Ripple Rejection versus Frequency
100
80 Iout = 50 mA
Iout = 1.5 A
60 Vout = 5.0 V
Vin = 10 V
CO = 0
40 TJ = 25°C
20
1.0 10 100 1.0 k 10 k 100 k 1.0 M 10 M 100 M
f, FREQUENCY (Hz)
Figure 6. Ripple Rejection versus
Output Current
100
80
60
40
30
0.01
Vout = 5.0 V
Vin = 10 V
CO = 0
f = 120 Hz
TJ = 25°C
0.1 1.0
Iout, OUTPUT CURRENT (A)
10
Figure 7. Quiescent Current versus
Input Voltage
4.0 TJ = 0°C
TJ = 25°C
3.0 TJ = 125°C
2.0
1.0 TJ = 0°C
TJ = 25°C
0 TJ = 125°C
0 10 20
30
Vin, INPUT VOLTAGE (Vdc)
40
Figure 8. Quiescent Current versus
Output Current
5.0
4.0 TJ = 0°C
TJ = 25°C
3.0 TJ = 125°C
2.0
1.0
0
0.01
Vin–Vout = 5.0 V
0.1 1.0
Iout, OUTPUT CURRENT (A)
10
MOTOROLA ANALOG IC DEVICE DATA
7

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MC78T12BT

THREE-AMPERE POSITIVE FIXED VOLTAGE REGULATORS

Motorola Semiconductors
Motorola Semiconductors
MC78T12BT

THREE-AMPERE POSITIVE FIXED VOLTAGE REGULATORS

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