LM78XX Series Voltage Regulators

1 TL/H/7746LM78XX Series Voltage RegulatorsFebruary 1995LM78XX Series Voltage RegulatorsGeneral DescriptionThe LM78XX Series of three terminal Regulators is availablewith several fixed output voltages making them useful in awide range of applications. One of these is local on cardregulation, eliminating the distribution problems associatedwith single point regulation. The voltages available allowthese Regulators to be used in logic systems, instrumenta-tion, HiFi, and other solid state electronic equipment. Al-though designed primarily as fixed Voltage Regulators thesedevices can be used with external components to obtainadjustable voltages and LM78XX Series is available in an aluminum TO-3 pack-age which will allow over load current if adequate heatsinking is provided. Current limiting is included to limit thepeak output current to a safe value. Safe area protection forthe output transistor is provided to limit internal power dissi-pation.

2 If internal power dissipation becomes too high forthe heat sinking provided, the thermal shutdown circuittakes over preventing the IC from effort was expanded to make the LM78XX se-ries of Regulators easy to use and mininize the numberof external components. It is not necessary to bypass theoutput, although this does improve transient response. Inputbypassing is needed only if the regulator is located far fromthe filter capacitor of the power output Voltage other than 5V, 12V and 15V the LM117series provides an output Voltage range from to current in excess of 1 AYInternal thermal overload protectionYNo external components requiredYOutput transistor safe area protectionYInternal short circuit current limitYAvailable in the aluminum TO-3 packageVoltage RangeLM7805C5 VLM7812C12 VLM7815C15 VSchematic and Connection DiagramsTL/H/7746 1 Metal Can PackageTO-3 (K)AluminumTL/H/7746 2 Bottom ViewOrder Number LM7805CK,LM7812CK or LM7815 CKSee NS Package Number KC02 APlastic PackageTO-220 (T)TL/H/7746 3 Top ViewOrder Number LM7805CT,LM7812CT or LM7815 CTSee NS Package Number T03BC1995 National Semiconductor CorporationRRD-B30M115/Printed in U.

3 S. Maximum RatingsIf Military/Aerospace specified devices are required,please contact the National Semiconductor SalesOffice/Distributors for availability and Voltage (VOe5V, 12V and 15V)35 VInternal Power Dissipation (Note 1)Internally LimitedOperating Temperature Range (TA)0 Ctoa70 CMaximum Junction Temperature(K Package)150 C(T Package)150 CStorage Temperature Rangeb65 Ctoa150 CLead Temperature (Soldering, 10 sec.)TO-3 Package K300 CTO-220 Package T230 CElectrical Characteristics LM78 XXC(Note 2) 0 CsTjs125 C unless otherwise Voltage5V12V15 VInput Voltage (unless otherwise noted)10V19V23 VUnitsSymbolParameterConditionsMin Typ Max Min Typ Max Min Typ MaxVOOutput VoltageTje25 C, 5 12 15 VPDs15W, 5 VVMINsVINsVMAX( ) ( ) ( )VDVOLine RegulationIOe500 mA Tje25 C3 504 1204 150 mVDVIN(7sVINs25) ) ( )V0 CsTjsa125 C50120150 mVDVIN(8sVINs20) (15sVINs27) ( )VIOs1 ATje25 C50120150 mVDVIN( ) ( ) ( )V0 CsTjsa125 C2560 75mVDVIN(8sVINs12) (16sVINs22) (20sVINs26)VDVOLoad RegulationTje25 5012 12012 150 mV250 mAsIOs750 mA256075 mV5mAsIOs1A, 0 CsTjsa125 C50120150 mVIQQ uiescent Current IOs1 ATje25 C888mA0 CsTjsa125 mADIQQ uiescent Current 5 mAChangeTje25 C, mAVMINsVINsVMAX( ) ( ) ( )

4 VIOs500 mA, 0 CsTjsa125 mAVMINsVINsVMAX(7sVINs25) ( ) ( )VVNO utput Noise Voltage TAe25 C, 10 Hzsfs100 kHz407590mVDVINDVOUTR ipple RejectionIOs1A, Tje25 Cor 62 8055 7254 70dBfe120 Hz IOs500 mA625554dB 0 CsTjsa125 CVMINsVINsVMAX(8sVINs18) (15sVINs25) ( ) VROD ropout VoltageTje25 C, Resistance fe1 kHz81819mXShort-Circuit Current Tje25 Output Current Tje25 TC of VOUT0 CsTjsa125 C, IOe5 CVINI nput VoltageRequired to Maintain Tje25 C, RegulationNote 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-220package (T) is typically 4 C/W junction to case and 50 C/W case to 2:All characteristics are measured with capacitor across the input of , and a capacitor across the output of All characteristics except noisevoltage and ripple rejection ratio are measured using pulse techniques (tws10 ms, duty cycles5%).

5 Output Voltage changes due to changes in internaltemperature must be taken into account Performance CharacteristicsDissipationMaximum Average PowerDissipationMaximum Average PowerPeak Output Currentto 1V at Tje25 C)Output Voltage (NormalizedRipple RejectionRipple RejectionOutput ImpedanceDropout VoltageDropout CharacteristicsQuiescent CurrentQuiescent CurrentTL/H/7746 434 Physical Dimensionsinches (millimeters)Aluminum Metal Can Package (KC)Order Number LM7805CK, LM7812CK or LM7815 CKNS Package Number KC02A5LM78XX Series Voltage RegulatorsPhysical Dimensionsinches (millimeters) (Continued)TO-220 Package (T)Order Number LM7805CT, LM7812CT or LM7815 CTNS Package Number T03 BLIFE SUPPORT POLICYNATIONAL S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORTDEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONALSEMICONDUCTOR CORPORATION.

6 As used herein:1. Life support devices or systems are devices or 2. A critical component is any component of a lifesystems which, (a) are intended for surgical implantsupport device or system whose failure to perform caninto the body, or (b) support or sustain life, and whosebe reasonably expected to cause the failure of the lifefailure to perform, when properly used in accordancesupport device or system, or to affect its safety orwith instructions for use provided in the labeling, reasonably expected to result in a significant injuryto the SemiconductorNational SemiconductorNational SemiconductorNational SemiconductorCorporationEuropeHong Kong West Bardin RoadFax: (a49) 0-180-530 85 8613th Floor, Straight Block,Tel: 81-043-299-2309 Arlington, TX 76017 Email: Centre, 5 Canton : 81-043-299-2408 Tel: 1(800) 272-9959 Deutsch Tel: (a49) 0-180-530 85 85 Tsimshatsui, KowloonFax: 1(800) 737-7018 English Tel.

7 (a49) 0-180-532 78 32 Hong KongFran3ais 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.