LM78XX Series Voltage Regulators

General Description

The LM78XX series of three terminal regulators is available with several fixed output voltages making them useful in a wide range of applications. One of these is local on card regulation, eliminating the distribution problems associated with single point regulation. The voltages available allow these regulators to be used in logic systems, instrumentation, HiFi, and other solid state electronic equipment. Although designed primarily as fixed voltage regulators these devices can be used with external components to obtain adjustable voltages and currents.

The LM78XX series is available in an aluminum TO-3 package which will allow over 1.0A load current if adequate heat sinking is provided. Current limiting is included to limit the peak output current to a safe value. Safe area protection for the output transistor is provided to limit internal power dissipation. If internal power dissipation becomes too high for the heat sinking provided, the thermal shutdown circuit takes over preventing the IC from overheating.

Considerable effort was expanded to make the LM78XX series of regulators easy to use and minimize the number of external components. It is not necessary to bypass the output, although this does improve transient response. Input bypassing is needed only if the regulator is located far from the filter capacitor of the power supply.

For output voltage other than 5V, 12V and 15V the LM117 series provides an output voltage range from 1.2V to 57V.

Features

• Output current in excess of 1A

• Internal thermal overload protection

• No external components required

• Output transistor safe area protection

• Internal short circuit current limit

• Available in the aluminum TO-3 package

Voltage Range

LM7805C 5V

LM7812C 12V

LM7815C 15V

Absolute Maximum Ratings (Note 2)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

Input Voltage (V_O = 5V, 12V and 15V) 35V

Internal Power Dissipation (Note 1) Internally Limited

Operating Temperature Range (T_A) 0˚C to +70˚C

Maximum Junction Temperature

(K Package) 150˚C

(T Package) 150˚C

Storage Temperature Range −65˚C to +150˚C

Lead Temperature (Soldering, 10 sec.)

TO-3 Package K 300˚C

TO-220 Package T 230˚C

Note 1: Thermal resistance of the TO-3 package (K, KC) is typically 4˚C/W junction to case and 35˚C/W case to ambient. Thermal resistance of the TO-220 package (T) is typically 4˚C/W junction to case and 50˚C/W case to ambient.

Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. For guaranteed specifications and the test conditions, see Electrical Characteristics.

Connection Diagrams

Schematic

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