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Partno	Mfg	Dc	Qty	Available	Descript
TLE4278	INFINEON	N/a	2940	avai	Voltage Regulator

TLE4278 ,Voltage Regulatorfeatures are implemented in the TLE 4278 a load dependent watchdogfunction as well as a sophisticat ..
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TLE4278
Voltage Regulator
5-VLow-DropFixedVoltageRegulatorTLE4278G
FeaturesOutputvoltagetolerance2%VerylowcurrentconsumptionSeparatedresetandwatchdogoutputLow-dropvoltageWatchdogAdjustablewatchdogactivatingthresholdAdjustableresetthresholdOvertemperatureprotectionReversepolarityprotectionShort-circuitproofSuitableforuseinautomotiveelectronicsWidetemperaturerange
FunctionalDescription
TheTLE4278isamonolithicintegratedlow-dropfixed-voltageregulatorwhichcan
supplyloadsupto200mA.ThedeviceisavailableintheP-DSO-14-8package.Itis
designedtosupplymicroprocessorsystemsunderthesevereconditionsofautomotive
applicationsandthereforeequippedwithadditionalprotectionfunctionsagainstover
load,shortcircuitandovertemperature.OfcoursetheTLE4278canalsobeusedin
otherapplicationswhereastabilizedvoltageisrequired.inputvoltageVIintherangeof5.5VVI45VisregulatedtoVQ,nom=5Vwithan
accuracyof-2%.
ThedeviceoperatesinthewidetemperaturerangeofTj=–40to150C.
TwoadditionalfeaturesareimplementedintheTLE4278aloaddependentwatchdog
functionaswellasasophisticatedresetfunctionincludingpoweronreset,undervoltage
reset,adjustableresetdelaytimeandadjustableresetswitchingthreshold.
Thewatchdogfunctionmonitorsthemicrocontroller,includingtimebasefailures.Incaseamissingrisingedgewithinacertainpulserepetitiontimethewatchdogoutputisset
delaycapacitor.Topreventaresetincaseofmissingpulses,thewatchdogoutputWOseparatefromtheresetoutputROfortheTLE4278.Thewatchdogoutputcanbe
usedasaninterruptsignalforthemicrocontroller.Inanycaseitispossibletoconnect
pinWOandpinROexternally.
Whenthecontrollerissettosleepmodeorlowpowermodeitscurrentconsumption
dropsandnowatchdogpulsesarecreated.Inordertoavoidunnecessarywakeup
signalsduetomissingpulsesatpinWIthewatchdogfeaturecanbedisabledasa
functionoftheloadcurrent.Theswitchoffthresholdissetbyanexternalresistortopin
WADJ.Thewatchdogfunctioncanalsobeusedasatimer,whichperiodicallywakesup
thecontroller.ThereforethepinWADJhastobeconnectedtotheoutputQ.
Thepoweronresetfeatureisnecessaryforadefinedstartofthemicroprocessorwhen
switchingontheapplication.TheresetsignalatpinROgoeshighafteracertaindelay
timedtrdwhentheoutputvoltageoftheregulatorhassurpassedtheresetthreshold.The
delaytimeissetbytheexternaldelaycapacitor.Anundervoltageresetcircuit
supervisestheoutputvoltage.IncaseVQfallsbelowtheresetthresholdtheresetoutputsettoLOWafterashortresetreactiontimetrr.TheresetLOWsignalisgenerated
downtoanoutputvoltageVQof1V.Inadditiontheresetswitchingthresholdcanbe
adjustedbyanexternalvoltagedivider.Thisfeatureisusefulwithmicroprocessors
whichguaranteeasafeoperationdowntovoltagesbelowtheinternallysetreset
thresholdof4.65Vtypical.
Figure1PinConfiguration(topview)
PinDefinitionsandFunctions
Figure2BlockDiagram
AbsoluteMaximumRatingsj=–40to150C
InputVoltageI
OutputVoltageQ
ResetOutputRO
ResetDelayD
ResetSwitchingThresholdAdjustRADJ
WatchdogInputWI
WatchdogOutputWO
Note:ESDprotectionaccordingtoMILStd.883:-2kV.
Maximumratingsareabsoluteratings;exceedinganyoneofthesevaluesmay
causeirreversibledamagetotheintegratedcircuit.
OperatingRange
Note:Intheoperatingrangethefunctionsgiveninthecircuitdescriptionarefulfilled.
WatchdogAdjustWADJ
GroundGND
Temperatures
ThermalResistancePackagemountedonPCB80⌠80⌠1.5mm3;35←Cu;5←Sn;HeatSinkArea6cm2;zeroairflow.
AbsoluteMaximumRatings(cont’d)j=–40to150C
ElectricalCharacteristicsI=13.5V;–40CTj125C(unlessotherwisespecified)
ResetGenerator
WatchdogMeasuredwhentheoutputvoltageVQhasdropped100mVfromthenominalvalue.
ElectricalCharacteristics(cont’d)I=13.5V;–40CTj125C(unlessotherwisespecified)
Figure3TestCirciut
ApplicationInformation
Input,Output
TheinputcapacitorsCI1andCI2arenecessaryforcompensatinglineinfluences.Usingresistorofapprox.1τinserieswithCI1,theLCcircuitofinputinductanceandinput
capacitancecanbedamped.TostabilizetheregulationcircuittheoutputcapacitorCQis
necessary.StabilityisguaranteedatvaluesCQ∫10←FwithanESR5τwithinthe
operatingtemperaturerange.
Figure4ApplicationCircuit

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