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 mininize 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 Y Y Y Y Y Y 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 LM7812C LM7815C 5V 12V 15V Schematic and Connection Diagrams Metal Can Package TO-3 (K) Aluminum TL/H/7746 – 2 Bottom View Order Number LM7805CK, LM7812CK or LM7815CK See NS Package Number KC02A Plastic Package TO-220 (T) TL/H/7746 – 3 Top View Order Number LM7805CT, LM7812CT or LM7815CT See NS Package Number T03B TL/H/7746 – 1 C1995 National Semiconductor Corporation TL/H/7746 RRD-B30M115/Printed in U. S. A. LM78XX Series Voltage Regulators February 1995 Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Maximum Junction Temperature (K Package) (T Package) Input Voltage (VO e 5V, 12V and 15V) b 65§ C to a 150§ C Storage Temperature Range Lead Temperature (Soldering, 10 sec.) TO-3 Package K 300§ C TO-220 Package T 230§ C 35V Internal Power Dissipation (Note 1) Operating Temperature Range (TA) Internally Limited 0§ C to a 70§ C 150§ C 150§ C Electrical Characteristics LM78XXC (Note 2) 0§ C s Tj s 125§ C unless otherwise noted. Output Voltage 5V Input Voltage (unless otherwise noted) Symbol VO DVO Parameter Output Voltage Line Regulation 10V Conditions Min Quiescent Current DIQ Quiescent Current Change Typ Max 11.5 12 12.5 14.4 15 V V V Tj e 25§ C DVIN Tj e 25§ C 3 50 (7 s VIN s 25) 4 120 14.5 s VIN s 30) 4 150 (17.5 s VIN s 30) mV V 50 (8 s VIN s 20) 120 (15 s VIN s 27) 150 (18.5 s VIN s 30) mV V 50 120 (7.5 s VIN s 20) (14.6 s VIN s 27) 150 (17.7 s VIN s 30) mV V 25 (8 s VIN s 12) 60 (16 s VIN s 22) 75 (20 s VIN s 26) mV V 10 12 12 mV mV 5 mA s IO s 1.5A 250 mA s IO s 750 mA 50 25 120 60 150 75 5 mA s IO s 1A, 0§ C s Tj s a 125§ C 50 120 150 mV IO s 1A 8 8.5 8 8.5 8 8.5 mA mA Tj e 25§ C 0§ C s Tj s a 125§ C 5 mA s IO s 1A Tj e 25§ C, IO s 1A VMIN s VIN s VMAX 0.5 0.5 0.5 mA 1.0 (7.5 s VIN s 20) 1.0 (14.8 s VINs 27) 1.0 (17.9 s VIN s 30) mA V 1.0 (7 s VIN s 25) 1.0 (14.5 s VINs 30) 1.0 (17.5 s VIN s 30) mA V 40 75 90 mV 70 dB dB Output Noise Voltage TA e 25§ C, 10 Hz s f s 100 kHz DVIN Ripple Rejection DVOUT Min 15.6 IO s 500 mA, 0§ C s Tj s a 125§ C VMIN s VIN s VMAX VN Max 4.8 0§ C s Tj s a 125§ C DVIN IQ Units Typ 4.75 5.25 11.4 12.6 14.25 15.75 (7.5 s VIN s 20) (14.5 s VIN s 27) (17.5 s VIN s 30) IO e 500 mA Tj e 25§ C DVIN 5.2 23V Min Tj e 25§ C, 5 mA s IO s 1A IO s 1A Load Regulation 19V Typ Max 5 15V PD s 15W, 5 mA s IO s 1A VMIN s VIN s VMAX 0§ C s Tj s a 125§ C DVIN DVO 12V f e 120 Hz Ð IO s 1A, Tj e 25§ C or IO s 500 mA 62 62 0§ C s Tj s a 125§ C VMIN s VIN s VMAX RO Dropout Voltage Output Resistance Short-Circuit Current Peak Output Current Average TC of VOUT Tj e 25§ C, IOUT e 1A f e 1 kHz Tj e 25§ C Tj e 25§ C 0§ C s Tj s a 125§ C, IO e 5 mA VIN Input Voltage Required to Maintain Tj e 25§ C, IO s 1A Line Regulation 80 55 55 72 54 54 (8 s VIN s 18) (15 s VIN s 25) (18.5 s VIN s 28.5) V 2.0 8 2.1 2.4 0.6 2.0 18 1.5 2.4 1.5 2.0 19 1.2 2.4 1.8 V mX A A mV/§ C 7.5 14.6 17.7 V 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: All characteristics are measured with capacitor across the input of 0.22 mF, and a capacitor across the output of 0.1mF. All characteristics except noise voltage and ripple rejection ratio are measured using pulse techniques (tw s 10 ms, duty cycle s 5%). Output voltage changes due to changes in internal temperature must be taken into account separately. 2 Typical Performance Characteristics Maximum Average Power Dissipation Maximum Average Power Dissipation Peak Output Current Output Voltage (Normalized to 1V at Tj e 25§ C) Ripple Rejection Ripple Rejection Output Impedance Dropout Voltage Dropout Characteristics Quiescent Current Quiescent Current TL/H/7746 – 4 3 4 Physical Dimensions inches (millimeters) Aluminum Metal Can Package (KC) Order Number LM7805CK, LM7812CK or LM7815CK NS Package Number KC02A 5 LM78XX Series Voltage Regulators Physical Dimensions inches (millimeters) (Continued) TO-220 Package (T) Order Number LM7805CT, LM7812CT or LM7815CT NS Package Number T03B LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. 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