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March200 8

LM78XX/LM78XX

A3-Terminal 1A Positive Voltage Regulator

Features General Description

Output Current up to 1A The LM78XX ser ies of three terminal positive regulators

are available in the TO-220 package and with severalOutput Voltages of 5, 6, 8, 9, 10, 12, 15, 18, 24fixed output voltages, making them useful in a wide

Thermal Overload Protectionrange of applications. Each type employs internal current

Short Circuit Protectionlimiting, thermal shut down and safe operating area pro-

Output Transistor Safe Operating Area Protection tection, making it essentially indestructible. If adequate

heat sinking is provided, they can deliver over 1A output

current. Although designed primarily as fixed voltage

regulators, these devices can be used with external com-

ponents to obtain adjustable voltages and currents.

Ordering Information

Product Number Output Voltage Tolerance Package Operating Temperature

LM7805CT 4% TO-220 -40C to +125C

LM7806CT

LM7808CT

LM7809CT

LM7810CT

LM7812CT

LM7815CT

LM7818CT

LM7824CT

LM7805ACT 2% 0C to +125C

LM7806ACT

LM7808ACT

LM7809ACT

LM7810ACT

LM7812ACT

LM7815ACT

LM7818ACT

LM7824ACT

12006 Fairchild Semiconductor Corporation www.fairchildsemi.com

LM78XX/LM78XXA Rev. 1.0

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Block Diagram

Input Series Pass OutputElement

1 3

Current SOAGenerator Protection

Starting Reference Error Circuit Voltage Amplifier

Thermal

Protection

GND

2

Figure 1.

Pin Assignment

TO-220

GND

1. Input

1 2. GND

3. Output

Figure 2.

Absolute Maximum Ratings

Absolute maximum ratings are those values beyond which damage to the device may occur. The datasheet

specifications should be met, without exception, to ensure that the system design is reliable over its power supply,

temperature, and output/input loading variables. Fairchild does not recommend operation outside datasheetspecifications.

Symbol Parameter Value Unit

V Input Voltage V = 5V to 18V 35 VI O

V = 24V 40 VO

R Thermal Resistance Junction-Cases (TO-220) 5 C/WJC

R Thermal Resistance Junction-Air (TO-220) 65 C/WJA

T Operating Temperature LM78xx -40 to +125 COPR

RangeLM78xxA 0 to +125

T St or ag e T em per at ure Ra nge -6 5 to + 15 0 CSTG

2 www.fairchildsemi.comLM78XX/LM78XXA Rev. 1.0

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Electrical Characteristics (LM7805)

Refer to the test circuits. -40C

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Electrical Characteristics (LM7806) (Continued)R efer to the t es t c ir cu it s. -40C

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Electrical Characteristics (LM7808) (Continued)R efer to the t es t c ir cu it s. -40C

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Electrical Characteristics (LM7809) (Continued)R efer to the t es t c ir cu it s. -40C

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Electrical Characteristics (LM7810) (Continued)R efer to the t es t c ir cu it s. -40C

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Electrical Characteristics (LM7812) (Continued)R efer to the t es t c ir cu it s. -40C

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Electrical Characteristics (LM7815) (Continued)R efer to the t es t c ir cu it s. -40C

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Electrical Characteristics (LM7818) (Continued)R efer to the t es t c ir cu it s. -40C

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Electrical Characteristics (LM7824) (Continued)R efer to the t es t c ir cu it s. -40C

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Electrical Characteristics (LM7805A) (Continued)Refer to the test circuits. 0C

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Electrical Characteristics (LM7806A) (Continued)Refer to the test circuits. 0C

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Electrical Characteristics (LM7809A) (Continued)Refer to the test circuits. 0C

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Electrical Characteristics (LM7812A) (Continued)Refer to the test circuits. 0C

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Electrical Characteristics (LM7815A) (Continued)Refer to the test circuits. 0C

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Electrical Characteristics (LM7818A) (Continued)Refer to the test circuits. 0C

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Typical Performance Characteristics

6 3V= 1 0V T = 25 CI JV = 5 V V = 1 0 0m VO OI = 5 m A

5.75 2.5O

5.5 2

5.25 1.5

5 1

4.75 .5

4.5 0-50 0 0 -25 25 50 75 100 125 5101520253035

JUNCTION TEMPERATURE (C) INPUT-OUTPUT DIFFERENTIAL (V)

Figure 3. Quiescent Current Figure 4. Peak Output Current

1.02 7V V = 5 V T = 25 C

I O J

I = 5mA V = 5 VO O

I = 1 0 m A6.5 O

1.01

6

1 5.5

5

0.99

4.5

0.98 4-50 0 25 50 75 100 125-25 5152025303510

JUNCTION TEMPERATURE (C) INPUT VOLTAGE (V)

Figure 5. Output Voltage Figure 6. Quiescent Current

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1 3LM78XX

OutputInput

CC 2 0.1FOI0.33 F

Figure 10. Fixed Output Regulator

1 3LM78XX Output

Input

C VC 2 0.1FO XXI0.33 F R

1IQ

IO

RLVXXI = R

O +I Q1

Notes :

1. To specify an output voltage, substitute voltage value for XX. A common ground is required between the input and the

output voltage. The input voltage must remain typically 2.0V above the output voltage even during the low point on the input

ripple voltage.

2. C is required if regulator is located an appreciable distance from power supply filter.I

3. C improves stability and transient response.O

Figure 11.

Output1 3

LM78XX

InputVC XXC 2 R10.1FOI

0.33 FIQ

R2

I =5 IR I Q

V = V (1 +R /R ) +I R O X X 2 1 Q 2

Figure 12. Circuit for Increasing Output Voltage

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Output

Input

+

0.1F

2

1 3LM78XX

Figure 18. Negative Output Voltage Circuit

1mHInput D45H11 Output

4704.7

Z1 31 LM78XX

2+0.33F

10F

+0.52000F

Figure 19. Switching Regulator

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Mechanical Dimensions

Dimensions in millimeters

TO-220

9.90 4.500.20 0.20

(8.70)

+0.101.303.60 0.10 0.05

1.27 1.520.10 0.10

0.80 0.10 +0.100.50 2.40 0.200.052.54TYP 2.54TYP

[2.54 ] [2.54 ] 0.20 0.20

10.00 0.20

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