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Ultra Low Power Boost Converter with Battery …

12435678910111216151413`CHVRLBSTCSTORVST ORVBAT_OKbq25504 SolarCell+-ROC 1 ROC 2 CREFROV1 ROV2 RUV 1 RUV 2 ROK1 ROK2 ROK3 BatterySYSTEMLOADVSSVIN_DCAVSSVOC_SAMPVR EF_SAMPOT_PROG VBAT_OV VRDIV VBAT _UVLBSTVSTOR VBATVSSOK_HYSTOK_PROGVBAT _OKCFLTRP roductFolderSample &BuyTechnicalDocumentsTools &SoftwareSupport &Communitybq25504 SLUSAH0C OCTOBER2011 REVISEDJUNE2015bq25504 Ultra Low-PowerBoostConverterWith BatteryManagementfor EnergyHarvesterApplications1 Features3 DescriptionThebq25504deviceis the first of a newfamilyof1 UltraLow-PowerWithHigh-EfficiencyDC-DCin telligentintegratedenergyharvestingnano- powerBoostConverter/Chargermanagementsol utionsthatarewellsuitedfor ContinuousEnergyHarvestingFromLow-Inputm eetingthespecialneedsof ultralowpowerSources:VIN 80 mV (Typical) specificallydesignedtoeffici

bq25504 www.ti.com SLUSAH0C–OCTOBER 2011–REVISED JUNE 2015 5 Description (Continued) The bq25504 also implements a programmable maximum power point tracking sampling network to optimize the

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Transcription of Ultra Low Power Boost Converter with Battery …

1 12435678910111216151413`CHVRLBSTCSTORVST ORVBAT_OKbq25504 SolarCell+-ROC 1 ROC 2 CREFROV1 ROV2 RUV 1 RUV 2 ROK1 ROK2 ROK3 BatterySYSTEMLOADVSSVIN_DCAVSSVOC_SAMPVR EF_SAMPOT_PROG VBAT_OV VRDIV VBAT _UVLBSTVSTOR VBATVSSOK_HYSTOK_PROGVBAT _OKCFLTRP roductFolderSample &BuyTechnicalDocumentsTools &SoftwareSupport &Communitybq25504 SLUSAH0C OCTOBER2011 REVISEDJUNE2015bq25504 Ultra Low-PowerBoostConverterWith BatteryManagementfor EnergyHarvesterApplications1 Features3 DescriptionThebq25504deviceis the first of a newfamilyof1 UltraLow-PowerWithHigh-EfficiencyDC-DCin telligentintegratedenergyharvestingnano- powerBoostConverter/Chargermanagementsol utionsthatarewellsuitedfor ContinuousEnergyHarvestingFromLow-Inputm eetingthespecialneedsof ultralowpowerSources:VIN 80 mV (Typical) specificallydesignedtoefficientlyacquire and managethe microwatts( W) Ultra -LowQuiescentCurrent:IQ< 330 nAto miliwatts(mW)of powergeneratedfroma variety(Typical)of DC sourceslike photovoltaic(solar)or thermal Cold-StartVoltage.

2 VIN 330 mV (Typical) bq25504is the first deviceof ProgrammableDynamicMaximumPowerPointits kindto implementa highlyefficientboostTracking(MPPT)conver ter/chargertargetedtowardproductsandsyst ems,suchas wirelesssensornetworks(WSNs) IntegratedDynamicMaximumPowerPointwhichh avestringentpowerandoperationalTrackingf or designof the bq25504startswithaVarietyof EnergyGenerationSourcesDC-DCboostconvert er/chargerthatrequiresonly InputVoltageRegulationPreventsCollapsing microwattsof powerto ,theboostconverter/chargercan EnergyStorageeffectivelyextractpowerfrom low-voltageoutput EnergyCan be Storedto RechargeableLi-ionharvesterssuchas thermoelectricgenerators(TEGs)

3 Batteries,Thin-filmBatteries,Super-or single-or ,or ConventionalCapacitorsconvertercan be startedwith VINas low as 330 mV,andoncestarted,can continueto harvestenergy BatteryChargingand Protectiondownto VIN= 80 mV. UserProgrammableUndervoltageandOvervolta geLevelsDeviceInformation(1) On-ChipTemperatureSensorWithPARTNUMBERPA CKAGEBODYSIZE(NOM)ProgrammableOvertemper atureShutoffbq25504 VQFN(16) x BatteryStatusOutput(1) For all availablepackages,see the orderableaddendumatthe end of the datasheet. BatteryGoodOutputPin ProgrammableThresholdand HysteresisSolarApplicationCircuit WarnAttachedMicrocontrollersof PendingLossof Power Can be Usedto Enableor DisableSystemLoads2 Applications EnergyHarvesting SolarChargers ThermalElectricGenerator(TEG)Harvesting WirelessSensorNetworks(WSNs) IndustrialMonitoring EnvironmentalMonitoring Bridgeand StructuralHealthMonitoring(SHM)

4 SmartBuildingControls Portableand WearableHealthDevices EntertainmentSystemRemoteControls1An IMPORTANTNOTICEat the end of this datasheetaddressesavailability,warranty, changes,use in safety-criticalapplications,intellectual propertymattersand OCTOBER2011 Applicationand Description(Continued)..311 Pin Configurationand Deviceand Mechanical,Packaging,and RevisionHistoryChangesfromRevisionB (December2014)to RevisionCPage Changedthe TestConditionfor PIN(CS)in Changedthe valuesfor PIN(CS)in theElectricalCharacteristicsFrom:TYP= 10, MAX= 50 To: TYP= 15, ChangedCFLTRTo: CBYPF igure14.

5 18 ChangedCBYP= F To: CBYP= F ChangedCFLTRTo: CBYPin Figure21 ..21 ChangedCBYP= F To: CBYP= F ChangedCFLTRTo: CBYPin Figure28 ..23 ChangedCBYP= F To: CBYP= F ChangedFigure34 ..26 ChangesfromRevisionA (September2012)to RevisionBPage AddedHandlingRatingtable,FeatureDescript ionsection,DeviceFunctionalModes,Applica tionandImplementationsection,PowerSupply Recommendationssection,Layoutsection,Dev iceandDocumentationSupportsection,andMec hanical,Packaging, (October2011)to RevisionAPage Addedthe Changedthe Changedthe BoostConverter, Changedthe Changedthe AddedCFLTRand Notes1 and 2 to Figure14.

6 18 AddedCFLTRand Notes1 and 2 to Figure21 ..21 AddedCFLTRand Notes1 and 2 to Figure28 ..232 SubmitDocumentationFeedbackCopyright 2011 2015, OCTOBER2011 REVISEDJUNE20155 Description(Continued)The bq25504also implementsa programmablemaximumpowerpointtrackingsam plingnetworkto optimizethetransferof powerinto the VIN_DCopen-circuitvoltageis programmedusingexternalresistors,and held with an externalcapacitor(CREF).For examplesolarcellsthat operateat maximumpowerpoint(MPP)of 80%of theiropen-circuitvoltage,theresistordivi dercan be set to 80%of the VIN_DCvoltageand the networkwill controlthe VIN_DCto operatenearthat ,an externalreferencevoltagecan be provideby a MCUtoproducea bq25504was designedwith the flexibilityto supporta varietyof availabilityofthe sourcesfromwhichharvestersextracttheiren ergycan oftenbe sporadicor energystorageelement,suchas a rechargeablebattery,supercapacitor.

7 Constantpoweris availablewhenneededfor storageelementalso allowsthe systemto handleany peakcurrentsthat cannotdirectlycomefromthe preventdamageto a customer s storageelement,bothmaximumand minimumvoltagesare monitoredagainstthe userprogrammedundervoltage(UV)and overvoltage(OV) furtherassistusersin the strictmanagementof theirenergybudgets,the bq25504togglesthe batterygoodflag to signalan attachedmicroprocessorwhenthe voltageon an energystoragebatteryor capacitorhasdroppedbelowa sheddingof loadcurrentsto preventthesystemfromenteringan OV, UV, and batterygoodthresholdsare the capabilitiesof bq25504are packedinto a small-footprint,16-lead,3-mmx 2011 2015,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback3 ProductFolderLinks.

8 Bq2550412435678910111216151413`bq25504 VSSVIN_DCAVSSVOC_SAMPVREF_SAMPOT_PROG VBAT_OV VRDIV VBAT_UVLBST VSTOR VBAT VSSOK_HYSTOK_PROGVBAT_OKbq25504 SLUSAH0C OCTOBER2011 Pin Configurationand FunctionsRGTP ackage16 PinsTop ViewPin the deviceInductorconnectionfor the 22 H inductorbetweenthisLBST16 Inputpin and pin 2 (VIN_DC).Connectto the mid-pointof externalresistordividerbetweenVRDIVand GNDfor not used,connectthis pin to the mid-pointof externalresistordividerbetweenVRDIVand GNDfor not used,connectthis pin to IC GNDfor 60 C thresholdorOT_PROG5 InputVSTORfor 120 C rechargeablestorageelementwith at least100 uF of equivalentcapacitanceto this the not the mid-pointof externalresistordividerbetweenVRDIVand GNDfor settingtheVBAT_OV6 InputVSTOR= the mid-pointof externalresistordividerbetweenVRDIVand GNDfor settingthe PFET betweenVBATand VSTOR opensif the voltageon VSTOR isbelowthis leasta F capacitoras closeas possibleVIN_DC2 Inputbetweenthis pin and pin for the mid-pointof

9 ExternalresistordividerbetweenVOC_SAMP3 InputVIN_DCand GNDfor settingthe MPPthresholdvoltagewhichwill be storedon the VREF_SAMPpin. To disablethe MPPT samplingcircuit,connectto F low leakagecapacitorfromthis pin to GNDto storethe voltageto whichVIN_DCwill be voltageis providedby the disabled,VREF_SAMP4 Inputeitheruse an externalvoltagesourceto providethis voltageor tie this pin to GNDto disableinputvoltageregulation( operatefroma low impedancepowersupply).VSS1 InputGeneralgroundconnectionfor the deviceVSS13 SupplyGeneralgroundconnectionfor the deviceConnectionfor the outputof the boostcharger,whichis typicallyconnectedto the leasta F capacitorin parallelwith a F capacitoras closeas possibletobetweenthis pin and pin 1 (VSS).

10 4 SubmitDocumentationFeedbackCopyright 2011 2015, OCTOBER2011 REVISEDJUNE20157 (1)overoperatingfree-airtemperaturerange (unlessotherwisenoted)MINMAXUNITI nputvoltage ,VOC_SAMP,VREF_SAMP,VBAT_OV,VBAT_UV,VRDI V,OK_HYST,OK_PROG,VBAT_OK,VBAT,VSTOR,LBS T(2)PeakInputPower,PIN_PK400mWOperatingj unctiontemperaturerange,TJ 40125 C(1)StressesbeyondthoselistedunderAbsolu teMaximumRatingsmay causepermanentdamageto the stressratingsonly and functionaloperationof the deviceat theseor any otherconditionsbeyondthoseindicatedunder RecommendedOperatingConditionsis not absolute maximum ratedconditionsfor extendedperiodsmay affectdevicereliability.


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