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Fairchild Semiconductor |
September 2014
LM78XX / LM78XXA
3-Terminal 1 A Positive Voltage Regulator
Features
• Output Current up to 1 A
• Output Voltages: 5, 6, 8, 9, 10, 12, 15, 18, 24 V
• Thermal Overload Protection
• Short-Circuit Protection
• Output Transistor Safe Operating Area Protection
Description
The LM78XX series of three-terminal positive regulators
is available in the TO-220 package and with several fixed
output voltages, making them useful in a wide range of
applications. Each type employs internal current limiting,
thermal shut-down, and safe operating area protection. If
adequate heat sinking is provided, they can deliver over
1 A output current. Although designed primarily as fixed-
voltage regulators, these devices can be used with exter-
nal components for adjustable voltages and currents.
TO-220 (Single Gauge)
GND
1. Input
1 2. GND
3. Output
Ordering Information(1)
Product Number
LM7805CT
LM7806CT
LM7808CT
LM7809CT
LM7810CT
LM7812CT
LM7815CT
LM7818CT
LM7824CT
LM7805ACT
LM7809ACT
LM7810ACT
LM7812ACT
LM7815ACT
Output Voltage
Tolerance
±4%
±2%
Package
TO-220
(Single Gauge)
Note:
1. Above output voltage tolerance is available at 25°C.
Operating
Temperature
Packing Method
-40°C to +125°C
Rail
0°C to +125°C
© 2006 Fairchild Semiconductor Corporation
LM78XX / LM78XXA Rev. 1.3.1
www.fairchildsemi.com
Block Diagram
Input
1
Starting
Circuit
Current
Generator
Reference
Voltage
Series Pass
Element
SOA
Protection
Error
Amplifier
Thermal
Protection
Figure 1. Block Diagram
Output
3
GND
2
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi-
tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only. Values are at TA = 25°C unless otherwise noted.
Symbol
Parameter
Value
Unit
VI
RθJC
RθJA
TOPR
Input Voltage
VO = 5 V to 18 V
VO = 24 V
Thermal Resistance, Junction-Case (TO-220)
Thermal Resistance, Junction-Air (TO-220)
Operating Temperature Range
LM78xx
LM78xxA
35
40
5
65
-40 to +125
0 to +125
V
°C/W
°C/W
°C
TSTG
Storage Temperature Range
- 65 to +150
°C
© 2006 Fairchild Semiconductor Corporation
LM78XX / LM78XXA Rev. 1.3.1
2
www.fairchildsemi.com
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