Motorola MC78T05ABT, MC78T15ACT, MC78T15BT, MC78T15CT, MC78T15ABT Datasheet
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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 |
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Input Voltage (5.0 V ± 12 V) |
VI |
35 |
Vdc |
(15 V) |
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40 |
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Power Dissipation and Thermal Characteristics |
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Plastic Package (Note 1) |
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TA = +25°C |
PD |
Internally Limited |
°C/W |
Thermal Resistance, Junction±to±Air |
RθJA |
65 |
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TC = +25°C |
PD |
Internally Limited |
°C/W |
Thermal Resistance, Junction±to±Case |
RθJC |
2.5 |
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Storage Junction Temperature |
Tstg |
+150 |
°C |
Operating Junction Temperature Range |
TJ |
0 to +125 |
°C |
(MC78T00C, AC) |
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NOTES: 1. Although power dissipation is internally limited, specifications apply only for PO ≤ Pmax, Pmax = 25 W.
Simplified Application
Input |
MC78TXX |
Output |
Cin* |
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0.33μF |
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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.
MC78T00
Series
THREE±AMPERE
POSITIVE FIXED
VOLTAGE REGULATORS
SEMICONDUCTOR
TECHNICAL DATA
T SUFFIX
PLASTIC PACKAGE
CASE 221A
Pin 1. |
Input |
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2. |
Ground |
1 |
3. |
Output |
2 |
3
Heatsink surface is connected to Pin 2.
DEVICE TYPE/NOMINAL OUTPUT VOLTAGE
MC78T05 |
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5.0 V |
MC78T12 |
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12 V |
MC78T08 |
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8.0 V |
MC78T15 |
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15 V |
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ORDERING INFORMATION |
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VO |
Operating |
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Temperature |
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Device |
Tol. |
Range |
Package |
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MC78TXXCT |
4% |
TJ = 0° to |
Plastic |
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MC78TXXACT |
2%* |
+125°C |
Power |
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MC78TXXBT# |
4% |
TJ = ± 40° to |
Plastic |
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MC78TXXABT# |
2%* |
+125°C |
Power |
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XX Indicates nominal voltage.
* 2% regulators available in 5, 12 and 15 V devices.
#Automotive temperature range selections are available with special test conditions and additional tests. Contact your local Motorola sales office for information.
Motorola, Inc. 1996 |
Rev 1 |
MC78T00 Series
ELECTRICAL CHARACTERISTICS (Vin = 10 V, IO = 3.0 A, 0°C ≤ TJ ≤ 125°C, PO ≤ Pmax [Note 1], unless otherwise noted.)
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MC78T05AC |
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MC78T05C |
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Characteristics |
Symbol |
Min |
Typ |
Max |
Min |
Typ |
Max |
Unit |
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Output Voltage |
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VO |
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Vdc |
(5.0 mA ≤ IO ≤ 3.0 |
A, TJ = +25°C) |
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4.9 |
5.0 |
5.1 |
4.8 |
5.0 |
5.2 |
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(5.0 mA ≤ IO ≤ 3.0 |
A; |
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4.8 |
5.0 |
5.2 |
4.75 |
5.0 |
5.25 |
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5.0 mA ≤ IO ≤ 2.0 A, 7.3 Vdc ≤ Vin ≤ 20 Vdc) |
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Line Regulation (Note 2) |
Regline |
± |
3.0 |
25 |
± |
3.0 |
25 |
mV |
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(7.2 Vdc ≤ Vin ≤ 35 Vdc, IO = 5.0 mA, TJ = +25°C; |
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7.2Vdc ≤ Vin ≤ 35 Vdc, IO = 1.0 A, TJ = +25°C;
8.0Vdc ≤ Vin ≤ 12 Vdc, IO = 3.0 A, TJ = +25°C;
7.5Vdc ≤ Vin ≤ 20 Vdc, IO = 1.0 A)
Load Regulation (Note 2) |
Regload |
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mV |
(5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C) |
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± |
10 |
30 |
± |
10 |
30 |
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(5.0 mA ≤ IO ≤ 3.0 A) |
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± |
15 |
80 |
± |
15 |
80 |
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Thermal Regulation |
Regtherm |
± |
0.001 |
0.01 |
± |
0.002 |
0.03 |
%VO/W |
(Pulse = 10 ms, P = 20 W, TA = +25°C) |
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Quiescent Current |
IB |
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mA |
(5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C) |
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± |
3.5 |
5.0 |
± |
3.5 |
5.0 |
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(5.0 mA ≤ IO ≤ 3.0 A) |
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± |
4.0 |
6.0 |
± |
4.0 |
6.0 |
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Quiescent Current Change |
IB |
± |
0.3 |
1.0 |
± |
0.3 |
1.0 |
mA |
(7.2 Vdc ≤ Vin ≤ 35 Vdc, IO = 5.0 mA, TJ = +25°C; |
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5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C; |
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7.5 Vdc ≤ Vin ≤ 20 Vdc, IO = 1.0 A) |
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Ripple Rejection |
RR |
62 |
75 |
± |
62 |
75 |
± |
dB |
(8.0 Vdc ≤ Vin ≤ 18 Vdc, f = 120 Hz, |
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IO = 2.0 A, TJ = 25°C) |
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Dropout Voltage (IO = 3.0 A, TJ = +25°C) |
Vin±VO |
± |
2.2 |
2.5 |
± |
2.2 |
2.5 |
Vdc |
Output Noise Voltage |
Vn |
± |
10 |
± |
± |
10 |
± |
μV/VO |
(10 Hz ≤ f ≤ 100 kHz, TJ = +25°C) |
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Output Resistance (f = 1.0 kHz) |
RO |
± |
2.0 |
± |
± |
20 |
± |
mΩ |
Short Circuit Current Limit |
ISC |
± |
1.5 |
± |
± |
1.5 |
± |
A |
(Vin = 35 Vdc, TJ = +25°C) |
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Peak Output Current (TJ = +25°C) |
Imax |
± |
5.0 |
± |
± |
5.0 |
± |
A |
Average Temperature Coefficient of Output Voltage |
TCVO |
± |
0.2 |
± |
± |
0.2 |
± |
mV/°C |
(IO = 5.0 mA) |
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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.
2 |
MOTOROLA ANALOG IC DEVICE DATA |
MC78T00 Series
ELECTRICAL CHARACTERISTICS (Vin = 13 V, IO = 3.0 A, 0°C ≤ TJ ≤ 125°C, PO ≤ Pmax [Note 1], unless otherwise noted.)
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MC78T08C |
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Characteristics |
Symbol |
Min |
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Typ |
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Max |
Unit |
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Output Voltage |
VO |
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Vdc |
(5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C) |
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7.7 |
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8.0 |
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8.3 |
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(5.0 mA ≤ IO ≤ 3.0 A; |
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7.6 |
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8.0 |
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8.4 |
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5.0 mA ≤ IO ≤ 2.0 A, 10.4 Vdc ≤ Vin ≤ 23 Vdc) |
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Line Regulation (Note 2) |
Regline |
± |
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4.0 |
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35 |
mV |
(10.3 Vdc ≤ Vin ≤ 35 Vdc, IO = 5.0 mA, TJ = +25°C |
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10.3 Vdc ≤ Vin ≤ 35 Vdc, IO = 1.0 A, TJ = +25°C |
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11 Vdc ≤ Vin ≤ 17 Vdc, IO = 3.0 A, TJ = +25°C |
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10.7 Vdc ≤ Vin ≤ 23 Vdc, IO = 1.0 A) |
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Load Regulation (Note 2) |
Regload |
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mV |
(5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C) |
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± |
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10 |
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30 |
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(5.0 mA ≤ IO ≤ 3.0 A) |
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± |
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15 |
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80 |
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Thermal Regulation |
Regtherm |
± |
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0.002 |
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0.03 |
%VO/W |
(Pulse = 10 ms, P = 20 W, TA = +25°C) |
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Quiescent Current |
IB |
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mA |
(5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C) |
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± |
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3.5 |
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5.0 |
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(5.0 mA ≤ IO ≤ 3.0 A) |
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± |
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4.0 |
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6.0 |
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Quiescent Current Change |
IB |
± |
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0.3 |
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1.0 |
mA |
(10.3 Vdc ≤ Vin ≤ 35 Vdc, IO = 5.0 mA, TJ = +25°C; |
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5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C; |
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10.7 Vdc ≤ Vin ≤ 23 Vdc, IO = 1.0 A) |
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Ripple Rejection |
RR |
60 |
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71 |
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± |
dB |
(11 Vdc ≤ Vin ≤ 21 Vdc, f = 120 Hz, IO = 2.0 A, TJ = 25°C) |
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Dropout Voltage (IO = 3.0 A, TJ = +25°C) |
Vin±VO |
± |
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2.2 |
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2.5 |
Vdc |
Output Noise Voltage |
Vn |
± |
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10 |
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± |
μV/VO |
(10 Hz ≤ f ≤ 100 kHz, TJ = +25°C) |
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Output Resistance (f = 1.0 kHz) |
RO |
± |
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2.0 |
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± |
mΩ |
Short Circuit Current Limit |
ISC |
± |
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1.5 |
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± |
A |
(Vin = 35 Vdc, TJ = +25°C) |
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Peak Output Current (TJ = +25°C) |
Imax |
± |
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5.0 |
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± |
A |
Average Temperature Coefficient of Output Voltage (IO = 5.0 mA) |
TCVO |
± |
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0.3 |
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± |
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.
MOTOROLA ANALOG IC DEVICE DATA |
3 |
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MC78T00 Series
ELECTRICAL CHARACTERISTICS (Vin = 17 V, IO = 3.0 A, 0°C ≤ TJ ≤ 125°C, PO ≤ Pmax [Note 1], unless otherwise noted.)
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MC78T12AC |
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MC78T12C |
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Characteristics |
Symbol |
Min |
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Typ |
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Max |
Min |
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Typ |
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Max |
Unit |
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Output Voltage |
VO |
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Vdc |
(5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C) |
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11.75 |
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12 |
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12.25 |
11.5 |
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12 |
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12.5 |
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(5.0 mA ≤ IO ≤ 3.0 A, |
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11.5 |
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12 |
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12.5 |
11.4 |
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12 |
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12.6 |
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5.0 mA ≤ IO ≤ 2.0 A, 14.5 Vdc ≤ Vin ≤ 27 Vdc) |
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Line Regulation (Note 2) |
Regline |
± |
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6.0 |
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45 |
± |
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6.0 |
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45 |
mV |
(14.5 Vdc ≤ Vin ≤ 35 Vdc, IO = 5.0 mA, TJ = +25°C; |
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14.5 Vdc ≤ Vin ≤ 35 Vdc, IO = 1.0 A, TJ = +25°C; |
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16 Vdc ≤ Vin ≤ 22 Vdc, IO = 3.0 A, TJ = +25°C; |
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14.9 Vdc ≤ Vin ≤ 27 Vdc, IO = 1.0 A) |
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Load Regulation (Note 2) |
Regload |
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mV |
(5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C) |
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± |
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10 |
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30 |
± |
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10 |
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30 |
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(5.0 mA ≤ IO ≤ 3.0 A) |
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± |
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15 |
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80 |
± |
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15 |
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80 |
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Thermal Regulation |
Regtherm |
± |
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0.001 |
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0.01 |
± |
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0.002 |
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0.03 |
%VO/W |
(Pulse = 10 ms, P = 20 W, TA = +25°C) |
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Quiescent Current |
IB |
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mA |
(5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C) |
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± |
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3.5 |
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5.0 |
± |
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3.5 |
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5.0 |
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(5.0 mA ≤ IO ≤ 3.0 A) |
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± |
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4.0 |
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6.0 |
± |
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4.0 |
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6.0 |
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Quiescent Current Change |
IB |
± |
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0.3 |
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1.0 |
± |
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0.3 |
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1.0 |
mA |
(14.5 Vdc ≤ Vin ≤ 35 Vdc, IO = 5.0 mA, TJ = +25°C; |
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5.0 mA ≤ IO ≤ 3.0 A, TJ = +25°C; |
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14.9 Vdc ≤ Vin ≤ 27 Vdc, IO = 1.0 A) |
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Ripple Rejection |
RR |
57 |
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67 |
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± |
57 |
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67 |
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± |
dB |
(15 Vdc ≤ Vin ≤ 25 Vdc, f = 120 Hz, |
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IO = 2.0 A, TJ = 25°C) |
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Dropout Voltage (IO = 3.0 A, TJ = +25°C) |
Vin ± VO |
± |
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2.2 |
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2.5 |
± |
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2.2 |
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2.5 |
Vdc |
Output Noise Voltage |
Vn |
± |
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10 |
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± |
± |
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10 |
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± |
μV/VO |
(10 Hz ≤ f ≤ 100 kHz, TJ = +25°C) |
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Output Resistance (f = 1.0 kHz) |
RO |
± |
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2.0 |
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± |
± |
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20 |
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± |
mΩ |
Short Circuit Current Limit |
ISC |
± |
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1.5 |
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± |
± |
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1.5 |
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± |
A |
(Vin = 35 Vdc, TJ = +25°C) |
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Peak Output Current (TJ = +25°C) |
Imax |
± |
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5.0 |
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± |
± |
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5.0 |
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± |
A |
Average Temperature Coefficient |
TCVO |
± |
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0.5 |
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± |
± |
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0.5 |
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± |
mV/°C |
of Output Voltage (IO = 5.0 mA) |
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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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