LM78XX (KA78XX, MC78XX) FIXED VOLTAGE REGULATOR (POSITIVE) 3-TERMINAL 1A POSITIVE VOLTAGE REGULATORS The LM78XxX series of three-terminal positive regulators are available in the TO-220/D-PAK package and with several fixed output voltages, making them useful in a wide range of applications. Each type employs internal current limiting, thermal shut-down and safe area protection, making it essentially indestructible. If adequate heat sinking is provided, they can deliver over 1A output current. Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltages and currents. FEATURES Output Current up to 1A Output Voltages of 5, 6, 8, 9, 10, 11, 12, 15, 18, 24V Thermal Overload Protection Short Circuit Protection Output Transistor SOA Protection TO-220 D-PAK 1: Input 2: GND 3: Output ORDERING INFORMATION . Output Voltage . Device Tolerance Packag Operating Temperature KA78XXCT +4% O~ 4+125C KA78XXAT +2% TO-220 KA78XXIT -40 ~ +125C +4% KA78XXR 0 4125C KA78XXAR +2% D-PAK * KA78XXIR +4% -40 ~ +125C BLOCK DIAGRAM INPUT SERIES OUTPUT PASS Oo 1 ELEMENT 3 CURRENT SOA = GENERATOR PROTECTION & STARTING REFERENCE ERROR CIRCUIT VOLTAGE AMPLIFIER e< THERMAL Ss PROTECTION GND Oo 2 ee Rev. B FAIRCHILD ee SEMICONDUCTOR - 1999 Fairchild Semiconductor CorporationLM78XX (KA78XX, MC78XX) FIXED VOLTAGE REGULATOR (POSITIVE) ABSOLUTE MAXIMUM RATINGS (Ta= +25C, unless otherwise specified) Characteristic Symbol Value Unit Input Voltage (for Vo = 5V to 18V) Vi 35 Vv (for Vo = 24V) Vi 40 Vv Thermal Resistance Junction-Cases Rosc 5 C/W Thermal Resistance Junction-Air Roua 65 C/W Operating Temperature Range KA78XX/A/R/RA Torn O~ +125 C KA78XXI/RI -40 ~ +125 Cc Storage Temperature Range Tsta -65 ~ +150 C LM7805/I/R/RI ELECTRICAL CHARACTERISTICS (Refer to test circuit, Tain < Ty < Twax, lo = 500MA, V = 10V, C= 0.33uF, Co= 0.1pF, unless otherwise specified) Characteristic Symbol Test Conditions LM78051 LM7805 Unit Min | Typ | Max| Min | Typ | Max Ty =+25 C 48])50]52/48]50] 52 Output Voltage Vo 5.0mA lo <1.0A, Pos 15W Vv V,=7V to 20V 4.75] 5.0 [5.25 V = 8V to 20V 4.75] 5.0 [5.25 Line Regulation AVo Ty-425C Vo =7V to 25V 4.0 | 100 4.0 | 100 mV V, = 8V to 12V 1.6] 50 1.6] 50 Load Regulation AVo Tyx425C lo = 5.0mA to1.5A g | 100 g | 100 mV lo =250mA to 750mMA 4 50 50 Quiescent Current la Ty =+25 C 5.0] 8 5.0] 8 mA lo = 5mA to 1.0A 0.03] 0.5 0.03] 0.5 Quiescent Current Change Ala Vig 7V to 25V 0.3) 1.3 mA Vi= 8V to 25V 0.3 | 1.3 Output Voltage Drift AVo/AT |lo= 5mMA -0.8 -0.8 mvV/C Output Noise Voltage Vu f = 10Hz to 100Khz, Ta=+25 C 42 42 pV/Vo Ripple f= 120Hz Rejection RR Vo =81t0 18V 62 | 73 62 | 73 dB Dropout Voltage Vo lo = 1A, Ty =+25 C 2 2 Vv Output Resistance Ro f=1KHz 15 15 mQ Short Circuit Current Isc Vi = 35V, Ta =+25 C 230 230 mA Peak Current IpK Ty =+25 C 2.2 2.2 A * Tin | 90 > | 90 mV Load Regulation AVo Ty=+25 C lo = SMA to 1.5A 12 | 180 12 | 180 mV lo = 250mA to 750mA 4 90 4 90 Quiescent Current lo Ty=+25 C 5.0] 8 5.0] 8 mA lo =5mA to 1.0A 0.5 0.5 Quiescent Current Change Ala Vi = 11.5V to 26V 1.3 mA Vi = 12.5V to 26V 1.3 Output Voltage Drift AVo/AT_|lo=5mA 1 1 mV/C Output Noise Voltage Vu f= 10Hz to 100Khz, Ta =+25 C 58 58 pV/Vo Ripple f= 120Hz Rejection RR Vi = 18V to 23V 56) 71 56) 71 dB Dropout Voltage Vb lo = 1A, Ty=+25 C 2 2 Vv Output Resistance Ro f=1KHz 17 17 mQ Short Circuit Current Iso Vi= 35V, Ta =+25 C 250 250 mA Peak Current IpK Ty= +25 C 2.2 2.2 A *Tuin aw Ln 2 1 5 55 al 3 a a a (| 5 z 45 98 4 -25 0 25 50 75 100125 5 10 15 20 25 30 35 JUNCTION TEMPERATURE (C) INPUT VOLTAGE (Vv) ee FAIRCHILD ee SEMICONDUCTOR -LM78XX (KA78XX, MC78XX) FIXED VOLTAGE REGULATOR (POSITIVE) TYPICAL APPLICATIONS Fig. 5 DC Parameters Vv oO KA78XX 0.336F Fig. 6 Load Regulation v1 oO KA78XX 0.334F 0 Vo Fig. 7 Ripple Rejection A vo Ay KA78XX 0.33.F Vo 470 uF Hv H, 120Hz +4+4 ee FAIRCHILD ee SEMICONDUCTOR - TYPICAL APPLICATIONS (Continued)LM78XX (KA78XX, MC78XX) FIXED VOLTAGE REGULATOR (POSITIVE) Fig. 8 Fixed Output Regulator Fig. 9 Constant Current Regulator Vio KA78XX Oo TI KA78XX o Vo Vv Vo Cae 2 Come a Ev 0.33yF Ota ns ; | O.1 uF a 54" a Notes: (1) To specify an output voltage. substitute voltage value for "XX." lo = + Ig Acommon ground is required between the input and the Output Ri voltage. The input voltage must remain typically 2.0V above the output voltage even during the low point on the input ripple voltage. (2) C, is required if regulator is located an appreciable distance from power Supply filter. (3) Coimproves stability and transient response. Fig. 10 Circuit for Increasing Output Voltage Fig. 11 Adjustable Output Regulator (7 to 30V) vO KA78XX o oO KA7805 Vo vi Vo M XX: 2 = 7 orm | Fan 0.33uF la iL Lote T033uF < T S 10Ke = R2 m m7 IR125 la Vo = Vx qd +Ro/R1)+lQRe eee sere ee el FAIRCHILD ee ree SEMICONDUCTOR -LM78XX (KA78XX, MC78XX) FIXED VOLTAGE REGULATOR (POSITIVE) TYPICAL APPLICATIONS (Continued) Fig. 12 High Current Voltage Regulator Fig. 13 High Output Current with Short Circuit Protection Qi BD536 R vi SC Qi or far vi Ri 1 3 a2 AA KA78XX =O at V 30 C lo ic ve AAW KA78xx [|-+9 = 3a i 0.33pF 2 0.1 4F O.33uF 2 owe Q1 =TIP42 R, = Veco: Q2=TIP42 Inea-lar Bar al lo =lkec + Bos (lnec-Veea/Ay) Vacoe Rs = sc Fig. 14 Tracking Voltage Regulator Fig. 15 Split Power Supply ( +15V-1A) . 3 KA7815 Q- KA78XX o +20V +15V Vv, { Vo 2 => az = > _ = "[oscee 2 01 =] 3 4.7ko 0.33yF 0.1, l 1N4001 COMM ON COMMON L | 22uF we ar 1 mz 1N4001 bi Oo Kn a 71 COa7915sG =2, o OQ - VIN Vo Pe EFAIRCGCHILD cf (iCSCsCSCSCSCCs SEMICONDUCTOR -LM78XX (KA78XX, MC78XX) FIXED VOLTAGE REGULATOR (POSITIVE) TYPICAL APPLICATIONS (Continued) Fig. 16 Negative Output Voltage Circuit Fig. 17 switching Regulator | D4SH11 mH Vo . LIN vi Vo + z 3 v $470 $ 4708 t O1puF 2 z 1 3 44 KA78XX - KA78XX + i OpF Te 1H [oF 2 + EZ 2000uF > J 050 7 77 77 eee sere ee el FAIRCHILD ee SEMICONDUCTOR -LM78XX (KA78XX, MC78XX) FIXED VOLTAGE REGULATOR (POSITIVE) ee FAIRCHILD ee SEMICONDUCTOR -TRADEMARKS The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. ACEx ISOPLANAR CoolFET MICROWIRE CROSSVOLT POP E?CMOS PowerTrench FACT qs FACT Quiet Series Quiet Series FAST SuperSOT-3 FASTr SuperSOT-6 GTo SuperSOT-8 HiSeC TinyLogic DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. 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PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Product Status Definition Advance Information Formative or This datasheet contains the design specifications for In Design product development. Specifications may change in any manner without notice. Preliminary First Production This datasheet contains preliminary data, and supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. No Identification Needed Full Production This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. Obsolete Not In Production This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only.