LM7805C,LM7812C,LM7815C LM78XX Series Voltage Regulators Literature Number: SNOSBR7C October 6, 2011 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 LM7812C LM7815C 5V 12V 15V Connection Diagrams Metal Can Package TO-3 (K) Aluminum Plastic Package TO-220 (T) 774602 Bottom View Order Number LM7805CK, LM7812CK or LM7815CK See NS Package Number KC02A (c) 2011 National Semiconductor Corporation 774603 Top View Order Number LM7805CT, LM7812CT or LM7815CT See NS Package Number T03B 7746 7746 Version 6 Revision 2 www.national.com Print Date/Time: 2011/10/06 10:52:33 LM78XX Series Voltage Regulators OBSOLETE LM78XX Schematic Diagram 774601 www.national.com 2 7746 Version 6 Revision 2 Print Date/Time: 2011/10/06 10:52:33 If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Voltage (VO = 5V, 12V and 15V) Internal Power Dissipation (Note 1) Operating Temperature Range (TA) 35V Internally Limited 0C to +70C Electrical Characteristics LM78XXC 150C 150C -65C to +150C 300C 230C (Note 2) 0C TJ 125C unless otherwise noted. Symbol VO VO Output Voltage 5V 12V Input Voltage (unless otherwise noted) 10V 19V Parameter Output Voltage Line Regulation Conditions Min Typ Max Tj = 25C, 5 mA IO 1A 4.8 PD 15W, 5 mA IO 1A 4.75 VMIN VIN VMAX (7.5 VIN 20) IO = 500 mA Tj = 25C 5 IO 1A Load Regulation Tj = 25C Quiescent Current V 4 120 4 150 (8 VIN 20) (15 VIN 27) (18.5 VIN 30) 50 120 150 (14.6 VIN 27) (17.7 VIN 30) mV V mV V mV V 25 60 75 (8 VIN 12) (16 VIN 22) (20 VIN 26) V 10 12 12 150 mV 5 mA IO 1.5A 50 120 mV 25 60 75 mV 5 mA IO 1A, 0C Tj +125 C 50 120 150 mV IO 1A 8 8 8 mA 8.5 8.5 8.5 mA Tj = 25C Quiescent Current 5 mA IO 1A 0.5 0.5 0.5 mA Change Tj = 25C, IO 1A 1.0 1.0 1.0 mA VMIN VIN VMAX (7.5 VIN 20) (14.8 VIN 27) (17.9 VIN 30) 1.0 1.0 1.0 (7 VIN 25) (14.5 VIN 30) (17.5 VIN 30) V 40 75 90 V 70 dB IO 500 mA, 0C Tj +125C VMIN VIN VMAX VN (14.5 VIN 27) (17.5 VIN 30) 150 0C Tj +125C IQ V 120 250 mA IO 750 mA IQ V 15.7 5 50 0C Tj +125C VO 15 12.6 14.2 5 (17.5 VIN 30) (7.5 VIN 20) VIN 15.6 50 12.5 14.4 Typ Max 14.5 VIN 30) Tj = 25C VIN 12 Min (7 VIN 25) 0C Tj +125C VIN 11.5 Units 23V Typ Max 5.25 11.4 3 VIN 5.2 Min 15V Output Noise Voltage TA =25C, 10 Hz f 100 kHz Ripple Rejection f = 120 Hz IO 1A, Tj = 25C or 62 IO 500 mA 62 55 (8 VIN 18) (15 VIN 25) 80 55 72 54 54 V mA dB 0C Tj +125C VMIN VIN VMAX 3 7746 Version 6 Revision 2 Print Date/Time: 2011/10/06 10:52:33 (18.5 VIN 28.5) V www.national.com LM78XX Maximum Junction Temperature (K Package) (T Package) Storage Temperature Range Lead Temperature (Soldering, 10 sec.) TO-3 Package K TO-220 Package T Absolute Maximum Ratings (Note 3) LM78XX Output Voltage 5V Input Voltage (unless otherwise noted) Symbol RO VIN Parameter 12V 10V Conditions Min Typ Max Dropout Voltage Tj = 25C, IOUT = 1A Output Resistance f = 1 kHz 8 Short-Circuit Tj = 25C Current Peak Output Tj = 25C Current Average TC of VOUT 0C Tj +125C, IO = 5 mA 2.1 2.4 0.6 15V 19V Min 2.0 Typ Max 23V Min 2.0 Units Typ Max 2.0 V 18 19 1.5 1.2 m A 2.4 2.4 A 1.5 1.8 mV/C Input Voltage Required to Maintain Line Regulation Tj = 25C, IO 1A 7.5 14.6 17.7 V Note 1: Thermal resistance of the TO-3 package (K, KC) is typically 4C/W junction to case and 35C/W case to ambient. Thermal resistance of the TO-220 package (T) is typically 4C/W junction to case and 50C/W case to ambient. Note 2: All characteristics are measured with capacitor across the input of 0.22 F, and a capacitor across the output of 0.1F. All characteristics except noise voltage and ripple rejection ratio are measured using pulse techniques (tw 10 ms, duty cycle 5%). Output voltage changes due to changes in internal temperature must be taken into account separately. Note 3: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. For guaranteed specifications and the test conditions, see Electrical Characteristics. www.national.com 4 7746 Version 6 Revision 2 Print Date/Time: 2011/10/06 10:52:33 LM78XX Typical Performance Characteristics Maximum Average Power Dissipation Maximum Average Power Dissipation 774605 774606 Peak Output Current Output Voltage (Normalized to 1V at TJ = 25C) 774607 774608 Ripple Rejection Ripple Rejection 774610 774609 5 7746 Version 6 Revision 2 Print Date/Time: 2011/10/06 10:52:33 www.national.com LM78XX Output Impedance Dropout Voltage 774611 774612 Dropout Characteristics Quiescent Current 774614 774613 Quiescent Current 774615 www.national.com 6 7746 Version 6 Revision 2 Print Date/Time: 2011/10/06 10:52:33 LM78XX Physical Dimensions inches (millimeters) unless otherwise noted Aluminum Metal Can Package (KC) Order Number LM7805CK, LM7812CK or LM7815CK NS Package Number KC02A 7 7746 Version 6 Revision 2 Print Date/Time: 2011/10/06 10:52:33 www.national.com LM78XX TO-220 Package (T) Order Number LM7805CT, LM7812CT or LM7815CT NS Package Number T03B www.national.com 8 7746 Version 6 Revision 2 Print Date/Time: 2011/10/06 10:52:33 LM78XX Notes 9 7746 Version 6 Revision 2 Print Date/Time: 2011/10/06 10:52:33 www.national.com LM78XX Series Voltage Regulators Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Design Support Amplifiers www.national.com/amplifiers WEBENCH(R) Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage References www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Applications & Markets www.national.com/solutions Mil/Aero www.national.com/milaero PowerWise(R) Solutions Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors SolarMagicTM www.national.com/solarmagic PLL/VCO www.national.com/wireless www.national.com/training PowerWise(R) Design University THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION ("NATIONAL") PRODUCTS. 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