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TL/H/7746LM78XX Series Voltage Regulators February 1995 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, instrumenta- tion, HiFi, and other solid state electronic equipment. Al- though 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 pack- age 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 dissi- pation. 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 se- ries 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. FeaturesYOutput current in excess of 1A YInternal thermal overload protection YNo external components required YOutput transistor safe area protection YInternal short circuit current limit YAvailable in the aluminum TO-3 package Voltage Range LM7805C 5V LM7812C 12V LM7815C 15V Schematic and Connection Diagrams TL/H/7746–1 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 C1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.# Page 2Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Input Voltage (V Oe5V, 12V and 15V) 35V Internal Power Dissipation (Note 1) Internally Limited Operating Temperature Range (T A)0§Cto a70§CMaximum Junction Temperature (K Package) 150 §C(T Package) 150 §CStorage Temperature Range b65§Cto a150§CLead Temperature (Soldering, 10 sec.) TO-3 Package K 300 §CTO-220 Package T 230 §CElectrical Characteristics LM78XXC (Note 2) 0 §CsTjs125§C unless otherwise noted. Output Voltage 5V 12V 15V Input Voltage (unless otherwise noted) 10V 19V 23V Units Symbol Parameter Conditions Min Typ Max Min Typ Max Min Typ Max VOOutput Voltage Tj e25§C,5mA sIOs1A 4.8 5 5.2 11.5 12 12.5 14.4 15 15.6 V PDs15W, 5 mA sIOs1A 4.75 5.25 11.4 12.6 14.25 15.75 V VMINsVINsVMAX(7.5sVINs20) (14.5 sVINs27) (17.5 sVINs30) V DVOLine Regulation I Oe500 mA Tj e25§C 3 50 4 120 4 150 mV DVIN(7sVINs25) 14.5 sVINs30) (17.5 sVINs30) V 0§CsTjsa125§C 50 120 150 mV DVIN(8sVINs20) (15 sVINs27) (18.5 sVINs30) V IOs1A Tj e25§C 50 120 150 mV DVIN(7.5sVINs20) (14.6 sVINs27) (17.7 sVINs30) V 0§CsTjsa125§C2560 75mV DVIN(8sVINs12) (16 sVINs22) (20 sVINs26) V DVOLoad Regulation Tj e25§C5mA sIOs1.5A 10 50 12 120 12 150 mV 250 mA sIOs750 mA 25 60 75 mV 5mA sIOs1A, 0 §CsTjsa125§C 50 120 150 mV IQQuiescent Current I Os1A Tj e25§C888mA 0§CsTjsa125§C 8.5 8.5 8.5 mA DIQQuiescent Current 5 mA sIOs1A 0.5 0.5 0.5 mA ChangeTje25§C, I Os1A 1.0 1.0 1.0 mA VMINsVINsVMAX(7.5sVINs20) (14.8 sVINs27) (17.9 sVINs30) V IOs500 mA, 0 §CsTjsa125§C 1.0 1.0 1.0 mA VMINsVINsVMAX(7sVINs25) (14.5 sVINs30) (17.5 sVINs30) V VNOutput Noise Voltage T Ae25§C, 10 Hz sfs100 kHz 40 75 90 mV DVIN DVOUTRipple Rejection I Os1A, Tj e25§Cor 62 80 55 72 54 70 dB fe120 Hz I Os500 mA 62 55 54 dB —0§CsTjsa125§CVMINsVINsVMAX(8sVINs18) (15 sVINs25) (18.5 sVINs28.5) V RODropout Voltage Tj e25§C, I OUTe1A 2.0 2.0 2.0 V Output Resistance f e1 kHz 8 18 19 m X Short-Circuit Current Tj e25§C 2.1 1.5 1.2 A Peak Output Current Tj e25§C 2.4 2.4 2.4 A Average TC of V OUT0§CsTjsa125§C, I Oe5 mA 0.6 1.5 1.8 mV/ §C VINInput Voltage Required to Maintain Tj e25§C, I Os1A 7.5 14.6 17.7 V Line Regulation 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 0.1 mF. All characteristics except noise voltage and ripple rejection ratio are measured using pulse techniques (t ws10 ms, duty cycle s5%). Output voltage changes due to changes in internal temperature must be taken into account separately. 2# Page 3Typical Performance Characteristics DissipationMaximum Average Power DissipationMaximum Average Power Peak Output Current to 1V at Tj e25§C)Output Voltage (Normalized Ripple Rejection Ripple Rejection Output Impedance Dropout Voltage Dropout Characteristics Quiescent Current Quiescent Current TL/H/7746–4 3# Page 5Physical Dimensions inches (millimeters) Aluminum Metal Can Package (KC) Order Number LM7805CK, LM7812CK or LM7815CK NS Package Number KC02A 5# Page 6LM78XX 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. Life support devices or systems are devices or 2. A critical component is any component of a life systems which, (a) are intended for surgical implant support device or system whose failure to perform can into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life failure to perform, when properly used in accordance support device or system, or to affect its safety or with instructions for use provided in the labeling, can effectiveness. be reasonably expected to result in a significant injury to the user. National Semiconductor National Semiconductor National Semiconductor National Semiconductor Corporation Europe Hong Kong Ltd. Japan Ltd. 1111 West Bardin Road Fax: ( a49) 0-180-530 85 86 13th Floor, Straight Block, Tel: 81-043-299-2309 Arlington, TX 76017 Email: cnjwge @tevm2.nsc.com Ocean Centre, 5 Canton Rd. Fax: 81-043-299-2408 Tel: 1(800) 272-9959 Deutsch Tel: ( a49) 0-180-530 85 85 Tsimshatsui, Kowloon Fax: 1(800) 737-7018 English Tel: ( a49) 0-180-532 78 32 Hong Kong Fran3ais Tel: ( a49) 0-180-532 93 58 Tel: (852) 2737-1600 Italiano Tel: ( a49) 0-180-534 16 80 Fax: (852) 2736-9960 National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.