LM79LXXA (KA79LXX, MC79LXX) FIXED VOLTAGE REGULATOR (NEGATIVE) 3-TERMINAL 0.1A NEGATIVE VOLTAGE REGULATORS These regulators employ internal current limiting and thermal shutdown, making them essentially indestructible. TO-92 FEATURES Output current up to 100mA No external components : : : e Internal thermal over load protection 1: GND 2: Input 3: Output e Internal short circuit current limiting Output Voltage Offered in + 5% Tolerance e Output Voltage of -5V,-12V,-15V,-18V and -24V ORDERING INFORMATION Device Package Operating Temperature SCHEMATIC DIAGRAM LM79LXXACZ| TO -92 0 ~ + 125C GND RIS * ya Ra3 + A213 RY 4 #r 4 +O ouT +_{a Q3 a6 | RIT 7 Re A3 ee ata Q13 08 rants at} Frz || - FR Ras $Rz $A7 R27 Fn EAS or Rev. B Pe FAIRCHILD fe tiCSCsCSCSCSCiss SEMICONDUCTOR -v 1999 Fairchild Semiconductor CorporationLM79LXXA (KA79LXX, MC79LXX) FIXED VOLTAGE REGULATOR (NEGATIVE) ABSOLUTE MAXIMUM RATINGS (Ta = +25C, unless otherwise specified) Characteristic Symbol Value Unit Input Voltage (-5V) -30 (-12V to -18V) Vi -35 Voc (-24V) -40 Operating Temperature Range Topr O~ +125 ce} Storage Temperature Range Tsta -65 ~ +150 C LM79L05A ELECTRICAL CHARACTERISTICS (V, = -10V, lo = 40mA, C, = 0.33uF, Co = 0.1m F, 0C <Ty <= +125C, unless otherwise specified) Characteristic Symbol Test Conditions Min Typ Max Unit Output Voltage Vo Ty = +25C -48 - 5.0 -5.2 Vv -7.0V = V\>-20V 15 150 line Reaulation AVo Ty =+25C BV SV,>-20V 100 mV 1.0MA < los 100mMA 20 60 Load Regulation AVo Ty =+25C 1.0MA <lo<40mA 10 30 mv -7.0V>V|>-20V, 1.0MAS lo <40MA - 4.75 - 5.25 Output Voltage Vo Vv Vi =-10V, 1.0MAS lo <70MA - 4.75 - 5.25 Ty = +25C 2.0 6.0 Quiescent Current la mA Ty = +125C 55 Quiescent With Line -8V2 V| 2-20V 1.5 Current Change |With Load Ala 1.0MAS lo <40mA 0.1 mA Output Noise Voltage Vu Ta = +25C,10Hzsf<1 00KHz 30 pV Ripple Rejection RR [f= 120H2, -8V2Vi2-18V 44 60 dB Ty = +25C Dropout Voltage Vb Ty = +25C 1.7 Vv * Load and line regulation are specified at constant junction temperature. Change in Vo due to heating effects must be taken into account separately. Pulse testing with low duty is used. ee FAIRCHILD ee SEMICONDUCTOR -vLM79LXXA (KA79LXX, MC79LXX) FIXED VOLTAGE REGULATOR (NEGATIVE) LM79L12A ELECTRICAL CHARACTERISTICS (V, = -19V, lo = 40mA, C, = 0.33uF, Co = 0.1m F, 0C STs <= +125C, unless otherwise specified) Characteristic Symbol Test Conditions Min Typ Max Unit Output Voltage Vo Ty = +25C -11.5 -12.0 -12.5 Vv -14.5V 2V| 2-27V 250 i : Ty =+25C ! Line Reaulation AVo 4 46VEV,2-27V 200 mv 1.0mAS lo <100MA 100 i AV Ty =+25C Load Regulation J TOMAS Io <40mA 50 mV Output Voltage Vo -14.5V>V) >-27V, 1.0MA<lo<40mA -11.4 -12.6 V Vi =-19V, 1.0MAS lo <70MA -11.4 -12.6 Quiescent Current lo Ti 428C os mA Ty = +125C 6.0 Quiescent With Line Al -16V2V| 2-27V 1.5 Current Change [With Load 1.0MAS lo <40mMA 0.1 mA Output Noise Voltage Vn Ta =+25C,10Hz f 100KHz 80 yV Ripple Rejection a ee 37 42 dB Ty = +25C Dropout Voltage Vb Ty = +25C 1.7 Vv * Load and line regulation are specified at constant junction temperature. Change in Vo due to heating effects must be taken into account separately. Pulse testing with low duty is used. LM79L15A ELECTRICAL CHARACTERISTICS (V, = -23V, lo = 40mA, C, = 0.33uF, Co = 0.1m F, 0C <Tys +125C, unless otherwise specified) Characteristic Symbol Test Conditions Min Typ Max Unit Output Voltage Vo Ty = +25C -14.4 | -15.0 -15.6 Vv -17.5V2V) 2-30V 300 : : Ty =+25C L Line Regulation AVo , -27V2V/2-30V 250 mv 1.0MAS lo <100MA 150 : AV, Ty =+25C Load Regulation o LOMAS lo <40mA 75 mv Outout Volt Vv -17.5V>V) >-30V, 1.0MAS lo s40MA -14.25 -15.75 uiput wollage 2 [V=-28V, 1.0mAS Ip <70mA 14.25 15.75 Vv Quiescent Current lo T= +25C 6.5 mA Ty = +125C 6.0 Quiescent With Line Al -20V2V| 2-30V 1.5 Current Change [With Load 1.0MAS lo <40mMA 0.1 mA Output Noise Voltage Vu Ta = 25C, 10Hzsf<1 00KHz 90 yV Ripple Rejection AR [f= 120Hz, -18.5V2 V\2-28.5V 34 39 dB Ty = +25C Dropout Voltage Vb Ty = +25C 1.7 Vv * Load and line regulation are specified at constant junction temperature. Change in Vo due to heating effects must be taken into account separately. Pulse testing with low duty is used. ee FAIRCHILD ee SEMICONDUCTOR -vLM79LXXA (KA79LXX, MC79LXX) FIXED VOLTAGE REGULATOR (NEGATIVE) LM79L18A ELECTRICAL CHARACTERISTICS (V = -27V, lo = 40mA, C, = 0.33uF, Co = 0.1m F, 0C <Ty< +125C, unless otherwise specified) Characteristic Symbol Test Conditions Min Typ Max Unit Output Voltage Vo Ty =+25C -17.3 | -18.0 | -18.7 Vv AV 495C -20.7V2 V/2-33V 325 mV . . =+ Line Reaulation J 21V>V>-33V 275 1.0MAS lo <100mMA 170 : AV, Ty =+25C Load Regulation ot LOMAS lo <40mA es | -20.7V>V >-33V, 1.0MAS lo <40mA 17.1 -18.9 Output Voltage Vi p 9 [VW =-1.0V, 1.0mAS lo <70mA 17.4 18.9 Vv Quiescent Current lo T= +25C 6.5 mA Ty = +125C 6.0 Quiescent With Line Al -21V2V| 2-33V 1.5 A Current Change [With Load 8 1.0MAS lo <40mA 0.1 m Output Noise Voltage Vn Ta =+25C, 10Hz<f<100KHz 150 pV Ripple Rejection AR [f= 120Hz, -23Vevi2-33V 33 | 48 dB Ty = +25C Dropout Voltage Vb Ty = +25C 1.7 Vv * Load and line regulation are specified at constant junction temperature. Change in Vo due to heating effects must be taken into account separately. Pulse testing with low duty is used. LM79L24A ELECTRICAL CHARACTERISTICS (V, = -33V, lo = 40mA, C, = 0.33uF, Co = 0.1m F, 0C <Tys+ 125C, unless otherwise specified) Characteristic Symbol Test Conditions Min Typ Max Unit Output Voltage Vo Ty = +25C -23 -24 -25 Vv 5 -27V2 V\2-38V 350 line Reaulation AVo Ty =+25C 2BV> V\>-38V 300 mv 1.0MAS lo <100MA 200 AV Ty =+25C v Load Regulation vat TOMAS Io <40mA 100 m Output Voltage Vo -27V>V| >-38V, 1.0MAS lo<40MA 22.8 25.2 Vv V, = -33V, 1.0MASs lo s70MA 22.8 25.2 Ty = +25C 6.5 C | A Quiescent Current Q T)=4125C 6.0 m Quiescent With Line Al -28V2V/ 2-38V 1.5 A Current Change |With Load 1.0MAS lo <40mA 0.1 m Output Noise Voltage Vn Ta = +25C, 10Hz<f<100KHz 200 nV Ripple Rejection AR [f= 120Hz, -29V2Vi2-35V 34 47 dB Ty = 425C Dropout Voltage Vp Ty = +25C 1.7 Vv * Load and line regulation are specified at constant junction temperature. Change in Vo due to heating effects must be taken into account separately. Pulse testing with low duty is used. ee FAIRCHILD ee SEMICONDUCTOR -vLM79LXXA (KA79LXX, MC79LXX) FIXED VOLTAGE REGULATOR (NEGATIVE) TYPICAL APPLICATIONS Design Considerations The LM79LXXA Series of fixed voltage regulators are designed with Thermal Overload Protection that shuts down the circuit when subjected to an excessive power overload condition. Internal Short-Circuit Protection that limits the maximum current the circuit will pass. In many low current applications, compensation capacitors are not required. However, it is recommended that the regulator input be bypassed with a capacitor if the regulator is connected to the power supply filter with long wire lengths, or if the output load capacitance is large. An input bypass Fig. 1 Positive And Negative Regulator T KA78LXXA [Ty 0.33yF OnE capacitor should be selected to provide good high - frequency characteristics to insure stable operation under all load conditions. A 0.33yF or larger tantalum, mylar, or other capacitor having low internal impedance at high frequencies should be chosen. The bypass capacitor should be mounted with the shortest possible leads directly across the regulator's input terminals. Normally good construction techniques should be used to minimize ground loops and lead resistance drops since the regulator has no external sense lead. Bypassing the output is also recommended. Fig. 2 Typical Application NPUT| KA79LXXA . OUTPUT q 2Co 0.33 pF Tf" 4 OApF -VO KAT9LXXA O-Ve 0.33,F A common ground is required between the Input and the output voltages. The input voltage must ; remain typically 2.0V above the output voltage even during the low point on the input ripple voltage. 77 = Cy, is required if regulator is located an appreciable distance from power supply filter. ** = Go improves stability and transient response. cee eer epee een ere FAIRCHILD pre ere SEMICONDUCTOR -v PACKAGE DIMENSIONLM79LXXA (KA79LXX, MC79LXX) FIXED VOLTAGE REGULATOR (NEGATIVE) TO82 Gimensions in Milimelers 459 6.20 D460 1447 tt 427TYP | || 2a TP |} ogg 28 [127.20] (12760.70] 3.6041 Pr a TY, a th ay rif _| Swe 8 el6s \ E29] ey mo om =a SAMSUNG ELECTADNICS CO.LTO. | FAIRCHILD | SEMICONDUCTOR -vTRADEMARKS 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. 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