MC78T00 Datasheet, PDF (1/12 Pages) Motorola, Inc – THREE-AMPERE POSITIVE FIXED VOLTAGE REGULATORS

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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
R_θJA
PD
R_θJC
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
1
3. Output
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