TLE6711 ,Multifunctional Voltage Regulator and WatchdogFeatures Step up converter (Boost Voltage) Boost Over- and Under-Voltage-Lockout Step down conve ..
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TLE6711
Multifunctional Voltage Regulator and Watchdog
MultifunctionalVoltageRegulatorandWatchdogTLE6711
DataSheetOverview
1.1FeaturesStepupconverter(BoostVoltage)BoostOver-andUnder-Voltage-LockoutStepdownconverter(LogicVoltage)2%outputvoltagetoleranceLogicOver-andUnder-Voltage-LockoutOvertemperatureShutdownPowerON/OFFresetgeneratorDigitalwindowwatchdogSystemEnableOutputAmbientoperationtemperaturerange–40°Cto125°CWideSupplyvoltageoperationrangeVerylowcurrentconsumptionVerysmallP-DSO-14-3SMDpackage
1.2FunctionalDescriptionThe
TLE6711Gisamultifunctionalpowersupplycircuitespeciallydesignedfor
automotiveapplications.deliversaprogrammablestepupvoltage(Boost)andaprecise5Vfullyshortcircuit
protectedoutputvoltage(Buck).
The
TLE6711Gcontainsapoweronresetfeaturetostartupthesystem,anintegrated
digitalwindowwatchdogtomonitortheconnectedmicrocontrollerandasystemenable
outputtoindicatethemicrocontrollerwindowwatchdogfaults.
ThedeviceisbasedonInfineon’spowertechnologySPT®whichallowsbipolarand
CMOScontrolcircuitrytobeintegratedwithDMOSpowerdevicesonthesame
monolithiccircuitry.
Theverysmall
P-DSO-14-3SMDpackagesmeettheapplicationrequirements.
Overviewbuck-voltageandtheovertemperatureshutdownfeatureincreasethereliabilityofthe
TLE6711Gsupplysystem.
1.3PinDefinitionsandFunctions
Overview
1.4PinConfiguration
Figure1PinConfiguration(topview)
Overview
1.5BlockDiagram
Figure2BlockDiagram
OverviewNote:Stressesabovethoselistedheremaycausepermanentdamagetothedevice.
Exposuretoabsolutemaximumratingconditionsforextendedperiodsmayaffect
devicereliability.
1.6AbsoluteMaximumRatings
Voltages
ESD-Protection(HumanBodyModel;R=1.5kΩ;C=100pF)
Temperatures
OverviewNote:Intheoperatingrange,thefunctionsgiveninthecircuitdescriptionarefulfilled.
1.7OperatingRange
ThermalResistance
Overview
1.8ElectricalCharacteristicswithrespecttoground;positivecurrentdefinedflowingintopin;unlessotherwise
specified.
CurrentConsumption
Under-andOver-VoltageLockoutatVBoost
Over-VoltageLockoutatVCC
Overview
Boost-Converter;BOI,BOFBandVBOOST
Buck-Converter;BUO,BDS,BUCandVCC
1.8ElectricalCharacteristics(cont’d)withrespecttoground;positivecurrentdefinedflowingintopin;unlessotherwise
specified.
Overview
ReferenceInput;R
(Oscillator;TimebaseforBoost-andBuck-Converter,ResetandWatchdog)
ResetGenerator;RO
1.8ElectricalCharacteristics(cont’d)withrespecttoground;positivecurrentdefinedflowingintopin;unlessotherwise
specified.
Overview
WatchdogGenerator;WDI
SystemEnableOutput;SEN
1.8ElectricalCharacteristics(cont’d)withrespecttoground;positivecurrentdefinedflowingintopin;unlessotherwise
specified.
Overview
Note:Thelistedcharacteristicsareensuredovertheoperatingrangeoftheintegrated
circuit.Typicalcharacteristicsspecifymeanvaluesexpectedovertheproduction
spread.Ifnototherwisespecified,typicalcharacteristicsapplyatTA=25°Cand
thegivensupplyvoltage.
BoostStatusOutput;OVL
ThermalShutdown(BoostandBuck-ConverterOFF)
1.8ElectricalCharacteristics(cont’d)withrespecttoground;positivecurrentdefinedflowingintopin;unlessotherwise
specified.
CircuitDescriptionCircuitDescription
BelowsomeimportantsectionsoftheTLE6711aredescribedinmoredetail.
2.1PowerOnResetordertoavoidanysystemfailure,asequenceofseveralconditionshastobepassed.caseofVCCpowerdown(VCCtRR)alogicLOWsignalisgeneratedatthe
pinROtoresetanexternalmicrocontroller.WhenthelevelofVCCreachesthereset
thresholdVRT,thesignalatROremainsLOWforthePower-upresetdelaytimetRD
beforeswitchingtoHIGH.IfVCCdropsbelowtheresetthresholdVRTforatimeextending
theresetreactiontimetRR,theresetcircuitisactivatedandapowerdownsequenceof
periodtRDisinitiated.TheresetreactiontimetRRavoidswrongtriggeringcausedbyshort
“glitches”ontheVCC-line.
Figure3ResetFunction
2.2WatchdogOperation
Thewatchdogusesonehundredoftheoscillator’sclocksignalperiodasatimebase,
definedasthewatchdogcycletimetCYL.
Afterpower-on,theresetoutputsignalattheROpin(microcontrollerreset)iskeptLOW
fortheresetdelaytimetRD,i.e.64cycles.WiththeLOWtoHIGHtransitionofthesignalROthedevicestartstheclosedwindowtimetCW=32cycles.Atriggersignalwithin
thiswindowisinterpretedasapretriggerfailureaccordingtothefiguresshownbelow.
CircuitDescription
windowlastsatminimumuntilthetriggerprocesshasoccurred,atmaximumtOWiscycles.HIGHtoLOWtransitionofthewatchdogtriggersignalonpinWDIistakenbyatrigger.avoidwrongtriggeringduetoparasiticglitchestwoHIGHsamplesfollowedbytwo
LOWsamples(sampleperiodtCYL)aredecodedasavalidtrigger.Ifatriggersignal
appearsatthewatchdoginputpinWDIduringtheopenwindoworapowerup/down
occurs,thewatchdogwindowsignalisresetandanewclosedwindowfollows.resetisgenerated(ROgoesLOW)ifthereisnotriggerpulseduringtheopenwindowifapretriggeroccursduringtheclosedwindow.Thisresethappensafter64cycles
afterthelatestvalidclosedwindowstarttimeandlastsforfurther64cycles.
Thetriggeringiscorrectalso,ifthefirstthreesamples(twoHIGHoneLOW)ofthetrigger
pulseatpinWDIareinsidetheclosedwindowandonlythefourthsample(thesecond
LOWsample)istakenintheopenwindow.additiontothemicrocontrollerresetsignalROthedevicegeneratesasystemenable
signalatpinSEN.IfROisHIGHthesystemenablegoesactiveHIGHwiththefirstvalid
watchdogtriggerpulseatpinWDI.TheSENoutputgoesLOWimmediatelyifa
pretrigger,amissingtriggerorapowerdownresetoccurs.
CircuitDescription
Figure4WindowWatchdogDefinitions
