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TPS255x-Q1精密汽车用可调电流受限配电开关1特性符合AEC-Q100–器件人体放电模式(HBM)静电放电(ESD)分类等级H2–器件组件充电模式(CDM)ESD分类等级C5提供功能安全–可帮助进行功能安全系统设计的文档满足USB限流要求可调电流限值:500mA至5A(典型值)4.
5A电流下的限流精度为±6.
5%快速短路响应:3.
5μs(典型值)22m高侧MOSFET工作电压范围:2.
5V至6.
5V最大待机电源电流2μA内置软启动15kV和8kV系统级ESD能力安全相关认证:–通过UL2367的UL认证–通过IEC60950的CB认证–通过IEC62368的CB认证2应用汽车USB充电端口3说明TPS2556-Q1和TPS2557-Q1配电开关专门用于需要精密电流限制,或者能够处理大电容负载和短路的汽车应用.
这些器件借助一个外部电阻器提供500mA至5A(典型值)之间的可编程电流限制阈值.
对电源开关上升和下降时间的控制最大限度地减少了接通或关闭期间的电流浪涌.
当输出负载超过限流阈值时,TPS2556-Q1和TPS2557-Q1器件通过切换到恒定电流模式来将输出电流限制在安全的水平上.
在过流和过热情况下,FAULT逻辑输出为低电平有效.
与TPS2511-Q1或TPS2513A-Q1一同使用,可实现一款低功耗、符合汽车标准的USB充电端口解决方案.
此解决方案能够为目前普遍使用的手机和平板电脑充电.
器件信息订货编号封装(1)封装尺寸TPS2556QDRBS-PVSON(8)3mmx3mmTPS2557QDRBS-PVSON(8)3mmx3mm(1)如需了解所有可用封装,请参阅数据表末尾的可订购产品附录.
作为单端口汽车USB充电端口电源开关的典型应用www.
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cnTPS2556-Q1,TPS2557-Q1ZHCSC61B–MARCH2014–REVISEDSEPTEMBER2020Copyright2021TexasInstrumentsIncorporatedSubmitDocumentFeedback1ProductFolderLinks:TPS2556-Q1TPS2557-Q1TPS2556-Q1,TPS2557-Q1ZHCSC61B–MARCH2014–REVISEDSEPTEMBER2020本文档旨在为方便起见,提供有关TI产品中文版本的信息,以确认产品的概要.
有关适用的官方英文版本的最新信息,请访问www.
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TI不保证翻译的准确性和有效性.
在实际设计之前,请务必参考最新版本的英文版本.
EnglishDataSheet:SLVSC97TableofContents1特性.
12应用.
13说明.
14RevisionHistory.
25DeviceComparisonTable.
36TerminalConfigurationandFunctions.
37Specifications.
37.
1AbsoluteMaximumRatings.
37.
2HandlingRatings.
47.
3RecommendedOperatingConditions.
47.
4ThermalInformation.
47.
5ElectricalCharacteristics.
57.
6SwitchingCharacteristics.
57.
7TypicalCharacteristics.
68ParameterMeasurementInformation.
79DetailedDescription.
89.
1Overview.
89.
2FunctionalBlockDiagram.
99.
3FeatureDescription.
99.
4DeviceFunctionalModes.
1010ApplicationsandImplementation.
1210.
1ApplicationInformation.
1210.
2TypicalApplication,DesignforCurrentLimit.
1211PowerSupplyRecommendations.
1712Layout.
1812.
1LayoutGuidelines.
1812.
2LayoutExample.
1813DeviceandDocumentationSupport.
1913.
1RelatedLinks.
1913.
2Trademarks.
1913.
3ElectrostaticDischargeCaution.
1913.
4Glossary.
1914Mechanical,Packaging,andOrderableInformation.
204RevisionHistoryChangesfromRevisionA(March2014)toRevisionB(September2020)Page向特性部分添加了功能安全链接和安全相关认证项目符号.
1更新了整个文档的表、图和交叉参考的编号格式.
1ChangesfromRevision*(March2014)toRevisionA(March2014)Page将"说明"中的器件型号从TPS2511-Q更改为TPS2511-Q1.
1ChangedCURRENTLIMITvaluesinElectricalCharacteristicstable5ChangedEquation112Revised图10-2graph.
12ChangedEquation213Changedresistorvaluefrom33.
2kΩto33.
6kΩ13ChangedEquation313ChangedEquation414Changedcurrent-limitthresholdfrom4316mAto4406mA14Changedvaluesin表10-214TPS2556-Q1,TPS2557-Q1ZHCSC61B–MARCH2014–REVISEDSEPTEMBER2020www.
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cn2SubmitDocumentFeedbackCopyright2021TexasInstrumentsIncorporatedProductFolderLinks:TPS2556-Q1TPS2557-Q15DeviceComparisonTableDEVICEMAX.
OPERATINGCURRENT(A)OUTPUTSENABLESTYPICALrDS(on)(mΩ)TPS2556-Q151Active-low22TPS2557-Q151Active-high22TPS2561A-Q12.
52Active-high446TerminalConfigurationandFunctions图6-1.
8-TerminalS-PVSONWithThermalPadDRBPackage(TopView)TerminalFunctionsTERMINALI/ODESCRIPTIONNAMETPS2556-Q1TPS2557-Q1EN4–IEnableinput,logiclowturnsonpowerswitch.
EN–4IEnableinput,logichighturnsonpowerswitch.
GND11–Groundconnection;connectexternallytoPowerPAD.
IN2,32,3IInputvoltage;connecta0.
1μForgreaterceramiccapacitorfromINtoGNDasclosetotheICaspossible.
FAULT88OActive-lowopen-drainoutput,assertedduringovercurrentorovertemperatureconditions.
OUT6,76,7OPower-switchoutput.
ILIM55OExternalresistorusedtosetcurrent-limitthreshold;recommended20k≤R(ILIM)≤187k.
Thermalpad–––InternallyconnectedtoGND;usedtoheat-sinktheparttothecircuitboardtraces.
ConnectthermapadtoGNDterminalexternally.
7Specifications7.
1AbsoluteMaximumRatingsoveroperatingfree-airtemperaturerangeunlessotherwisenoted(1)(2)MINMAX(2)UNITVoltagerangeonIN,OUT,ENorEN,ILIM,FAULT–0.
37VVoltagerangefromINtoOUT–77VIContinuousoutputcurrentInternallylimitedContinuousFAULTsinkcurrent25mAILIMsourcecurrentInternallylimitedmATJMaximumjunctiontemperature–40Internallylimited°C(1)StressesbeyondthoselistedunderAbsoluteMaximumRatingsmaycausepermanentdamagetothedevice.
Thesearestressratingsonly,whichdonotimplyfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderwww.
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cnTPS2556-Q1,TPS2557-Q1ZHCSC61B–MARCH2014–REVISEDSEPTEMBER2020Copyright2021TexasInstrumentsIncorporatedSubmitDocumentFeedback3ProductFolderLinks:TPS2556-Q1TPS2557-Q1RecommendedOperatingConditions.
Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.
(2)VoltagesarereferencedtoGNDunlessotherwisenoted.
7.
2HandlingRatingsPARAMETERMINMAXUNITTstgStoragetemperaturerange–65150°CV(ESD)(1)Human-bodymodel(HBM)ESDstressvoltage(2)–22kVCharged-devicemodel(CDM)ESDstressvoltage(3)–750750VSystemlevel(4)Contactdischarge–88kVAirdischarge–1515(1)Electrostaticdischarge(ESD)tomeasuredevicesensitivityorimmunitytodamagecausedbyassembly-lineelectrostaticdischargesintothedevice.
(2)ThepassinglevelperAEC-Q100ClassificationH2.
(3)ThepassinglevelperAEC-Q100ClassificationC5.
(4)SurgesperEN61000-4-2,1999appliedbetweenUSBconnectionforV(BUS)andgroundoftheTPS2556EVM(HPA423,replacingTPS2556withTPS2556-Q1)evaluationmodule(SLUU393).
Thesewerethetestlevels,notthefailurethreshold.
7.
3RecommendedOperatingConditionsMINMAXUNITV(IN)Inputvoltage,IN2.
56.
5VV(EN)EnablevoltageTPS2556-Q106.
5VV(EN)TPS2557-Q106.
5VIHHigh-levelinputvoltageonENorEN1.
1VVILLow-levelinputvoltageonENorEN0.
66I(OUT)Continuousoutputcurrent,OUT05AContinuousFAULTsinkcurrent010mATJOperatingjunctiontemperature–40125°CR(ILIM)Recommendedlimit-resistorrange20187kΩ7.
4ThermalInformationTHERMALMETRIC(1)TPS2556-Q1,TPS2557-Q1UNITDRB8TERMINALSRθJAJunction-to-ambientthermalresistance41.
5°C/WRθJC(top)Junction-to-case(top)thermalresistance56°C/WRθJBJunction-to-boardthermalresistance16.
4°C/WψJTJunction-to-topcharacterizationparameter0.
7°C/WψJBJunction-to-boardcharacterizationparameter16.
5°C/WRθJC(bot)Junction-to-case(bottom)thermalresistance3.
5°C/W(1)Formoreinformationabouttraditionalandnewthermalmetrics,seetheSemiconductorandICPackageThermalMetricsapplicationreport(SPRA953).
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5ElectricalCharacteristicsoverrecommendedoperatingconditions,VEN=0V,orVEN=VIN(unlessotherwisenoted)PARAMETERTESTCONDITIONS(1)MINTYPMAXUNITPOWERSWITCHrDS(on)Staticdrain-sourceon-stateresistanceTJ=25°C2225m–40°C≤TJ≤125°C35ENABLEINPUTENORENEnableterminalturnonorturnoffthreshold0.
661.
1VHysteresis55(2)mVI(EN)InputcurrentV(EN)=0Vor6.
5V,orV(EN)=0Vor6.
5V–0.
50.
5μACURRENTLIMITIOSCurrent-limitthreshold(maximumdcoutputcurrentI(OUT)deliveredtoload)andshort-circuitcurrent,OUTconnectedtoGNDR(ILIM)=24.
9k418045004745mAR(ILIM)=61.
9k161018051980R(ILIM)=100k94511101270SUPPLYCURRENTI(IN_off)Supplycurrent,low-leveloutputV(IN)=6.
5V,noloadonOUT,V(EN)=6.
5VorV(EN)=0V0.
12.
5μAI(IN_on)Supplycurrent,high-leveloutputV(IN)=6.
5V,noloadonOUTR(ILIM)=24.
9k95120μAR(ILIM)=100k85110μAI(REV)ReverseleakagecurrentV(OUT)=6.
5V,VIN=0VTJ=25°C0.
011μAUNDERVOLTAGELOCKOUTV(UVLO)Low-levelinputvoltage,INV(IN)rising2.
352.
45VHysteresis,IN35(2)mVFAULTFLAGVOLOutputlowvoltage,FAULTI(FAULT)=1mA180mVOff-stateleakageV(FAULT)=6.
5V1μAFAULTdeglitchFAULTassertionorde-assertionduetoovercurrentcondition6913msTHERMALSHUTDOWNT(OTSD2)Thermalshutdownthreshold155°CT(OTSD)Thermalshutdownthresholdincurrent-limit135°CHysteresis20(2)°C(1)Pulse-testingtechniquesmaintainjunctiontemperatureclosetoambienttemperature;thermaleffectsmustbetakenintoaccountseparately.
(2)Theseparametersareprovidedforreferenceonly,anddonoconstitutepartofTI'spublishedspecificationsforpurposesofTI'sproductwarranty.
7.
6SwitchingCharacteristicsMINTYPMAXUNITtrRisetime,outputVIN=6.
5VCL=1μF,RL=100,(see图8-1)234msVIN=2.
5V123tfFalltime,outputVIN=6.
5V0.
60.
81.
0VIN=2.
5V0.
40.
60.
8tonTurnontimeCL=1μF,RL=100,(see图8-1)9mstoffTurnofftime6mst(IOS)ResponsetimetoshortcircuitV(IN)=5V(see图8-2)3.
5(1)μs(1)Theseparametersareprovidedforreferenceonly,anddonoconstitutepartofTI'spublishedspecificationsforpurposesofTI'sproductwarrantywww.
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7TypicalCharacteristics图7-1.
UVLO–UndervoltageLockout–V图7-2.
IIN–SupplyCurrent,OutputDisabled–nAR(ILIM)=24.
9kΩ图7-3.
IIN–SupplyCurrent,OutputEnabled–μAR(ILIM)=24.
9kΩ图7-4.
IIN–SupplyCurrent,OutputEnabled–μA图7-5.
MOSFETrDS(on)VersusJunctionTemperatureR(ILIM)=100kΩ图7-6.
SwitchCurrentVersusDrain-SourceVoltageAcrossSwitchTPS2556-Q1,TPS2557-Q1ZHCSC61B–MARCH2014–REVISEDSEPTEMBER2020www.
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cn6SubmitDocumentFeedbackCopyright2021TexasInstrumentsIncorporatedProductFolderLinks:TPS2556-Q1TPS2557-Q1R(ILIM)=61.
9kΩ图7-7.
SwitchCurrentVersusDrain-SourceVoltageAcrossSwitchR(ILIM)=24.
9kΩ图7-8.
SwitchCurrentVersusDrain-SourceVoltageAcrossSwitch8ParameterMeasurementInformation图8-1.
TestCircuitandVoltageWaveforms图8-2.
ResponseTimetoShort-CircuitWaveformwww.
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OutputVoltageVersusCurrent-LimitThreshold9DetailedDescription9.
1OverviewTheTPS2556-Q1andTPS2557-Q1arecurrent-limited,power-distributionswitchesusingN-channelMOSFETsforapplicationsthatmightencountershortcircuitsorheavycapacitiveloads.
Thisdeviceallowstheusertoprogramthecurrent-limitthresholdbetween500mAand5A(typical)viaanexternalresistor.
Thisdeviceincorporatesaninternalchargepumpandthegate-drivecircuitrynecessarytodrivetheN-channelMOSFET.
ThechargepumpsuppliespowertothedrivercircuitandprovidesthenecessaryvoltagetopullthegateoftheMOSFETabovethesource.
Thechargepumpoperatesfrominputvoltagesaslowas2.
5Vandrequireslittlesupplycurrent.
Thedrivercontrolsthegatevoltageofthepowerswitch.
Thedriverincorporatescircuitrythatcontrolstheriseandfalltimesoftheoutputvoltagetolimitlargecurrentandvoltagesurgesandprovidesbuilt-insoft-startfunctionality.
TheTPS2556-Q1andTPS2557-Q1familylimitstheoutputcurrenttotheprogrammedcurrent-limitthresholdIOSduringanovercurrentorshort-circuiteventbyreducingthecharge-pumpvoltagedrivingtheN-channelMOSFETandoperatingitinthelinearrangeofoperation.
TheresultoflimitingtheoutputcurrenttoIOSreducestheoutputvoltageatOUTbynolongerfullyenhancingtheN-channelMOSFET.
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2FunctionalBlockDiagram9.
3FeatureDescription9.
3.
1OvercurrentConditionsTheTPS2556-Q1andTPS2557-Q1devicesrespondtoovercurrentconditionsbylimitingtheiroutputcurrenttoIOS.
Ondetectinganovercurrentcondition,thedevicemaintainsaconstantoutputcurrent,andtheoutputvoltagereducesaccordingly.
Twopossibleoverloadconditionscanoccur.
Thefirstconditioniswhenashortcircuitorpartialshortcircuitispresentonapowered-upandenableddevice.
Withtheoutputvoltageheldnearzeropotentialwithrespecttoground,theTPS2556-Q1orTPS2557-Q1devicerampstheoutputcurrenttoIOS.
TheTPS2556-Q1andTPS2557-Q1deviceslimitthecurrenttoIOSuntilremovaloftheoverloadconditionoruntilthedevicebeginstocyclethermally.
Thesecondconditioniswhenashortcircuit,partialshortcircuit,ortransientoverloadoccurswhilethedeviceisenabledandpoweredon.
Thedevicerespondstotheovercurrentconditionwithintimet(IOS)(see图8-2).
Overdrivingthecurrent-senseamplifierduringthistimeandmomentarilydisablestheinternalN-channelMOSFET.
Thecurrent-senseamplifierrecoversandrampstheoutputcurrenttoIOS.
Similartothepreviouscase,theTPS2556-Q1andTPS2557-Q1deviceslimitthecurrenttoIOSuntilremovaloftheoverloadconditionoruntilthedevicebeginstocyclethermally.
TheTPS2556-Q1andTPS2557-Q1cyclethermallyifanoverloadconditionispresentlongenoughtoactivatethermallimitinginanyoftheabovecases.
Thedeviceturnsoffwhenthejunctiontemperatureexceeds135°C(minimum)whileincurrentlimit.
Thedeviceremainsoffuntilthejunctiontemperaturecools20°C(typical)andthenrestarts.
TheTPS2556-Q1andTPS2557-Q1cycleonandoffuntilremovaloftheoverload(see图10-7).
9.
3.
2FAULTResponseAssertion(active-low)oftheFAULTopen-drainoutputoccursduringanovercurrentorovertemperaturecondition.
TheTPS2556-Q1andTPS2557-Q1devicesasserttheFAULTsignaluntilremovalofthefaultconditionandtheresumptionofnormaldeviceoperation.
DesignoftheTPS2556-Q1andTPS2557-Q1deviceseliminatesfalseFAULTreportingbyusinganinternaldelay(9-mstypical)deglitchcircuitforovercurrentconditionswithouttheneedforexternalcircuitry.
ThisavoidsaccidentalFAULTassertionduetonormaloperation,suchasstartingintoaheavycapacitiveload.
Thedeglitchcircuitrydelaysenteringandleavingcurrent-limit-inducedfaultconditions.
DeglitchingoftheFAULTsignaldoesnotoccurwhenanovertemperatureconditiondisablestheMOSFET,butdoesoccurafterthedevicehascooledandbeginstoturnon.
ThisunidirectionaldeglitchpreventsFAULToscillationduringanovertemperatureevent.
9.
3.
3ThermalSenseTheTPS2556-Q1andTPS2557-Q1devicesself-protectbyusingtwoindependentthermalsensingcircuitsthatmonitortheoperatingtemperatureofthepowerswitchanddisableoperationifthetemperatureexceedsrecommendedoperatingconditions.
TheTPS2556-Q1andTPS2557-Q1devicesoperateinconstant-currentwww.
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Thepowerdissipationinthepackageisproportionaltothevoltagedropacrossthepowerswitch,whichincreasesthejunctiontemperatureduringanovercurrentcondition.
Thefirstthermalsensor(OTSD)turnsoffthepowerswitchwhenthedietemperatureexceeds135°C(min)andthepartisincurrentlimit.
Hysteresisisbuiltintothethermalsensor,andtheswitchturnsonafterthedevicehascooledapproximately20°C.
TheTPS2556-Q1andTPS2557-Q1devicesalsohaveasecondthermalsensor(OTSD2).
Thisthermalsensorturnsoffthepowerswitchwhenthedietemperatureexceeds155°C(minimum)regardlessofwhetherthepowerswitchisincurrentlimit,andturnsonthepowerswitchafterthedevicehascooledapproximately20°C.
TheTPS2556-Q1andTPS2557-Q1devicescontinuetocycleoffandonuntilthefaultisremoved.
9.
4DeviceFunctionalModes9.
4.
1UndervoltageLockout(UVLO)Theundervoltagelockout(UVLO)circuitdisablesthepowerswitchuntiltheinputvoltagereachestheUVLOturnonthreshold.
Built-inhysteresispreventsunwantedon-and-offcyclingduetoinputvoltagedroopduringturnon.
9.
4.
2Enable(ENOREN)Thelogicenablecontrolsthepowerswitchanddevicesupplycurrent.
Thesupplycurrentisreducedtolessthan2μAwhenalogichighispresentonENorwhenalogiclowispresentonEN.
AlogiclowinputonENoralogichighinputonENenablesthedriver,controlcircuits,andpowerswitch.
TheenableinputiscompatiblewithbothTTLandCMOSlogiclevels.
9.
4.
3Auto-RetryFunctionalitySomeapplicationsrequirethatanovercurrentconditiondisablethedevicemomentarilyduringafaultconditionandre-enablesitafterapresettime.
Thisauto-retryfunctionalitycanbeimplementedwithanexternalresistorandcapacitor.
Duringafaultcondition,FAULTpullsENlow.
PullingENbelowtheturnoffthresholddisablesthepartisdisabled,andFAULTgoesintothehigh-impedancestate,allowingCRETRYtobegincharging.
Thedevicere-enableswhenthevoltageonENreachestheturnonthreshold.
Theresistor-capacitortimeconstantdeterminestheauto-retrytime.
Thedevicecontinuestocycleinthismanneruntilremovalofthefaultcondition.
图9-1.
Auto-RetryFunctionalitySomeapplicationsrequireauto-retryfunctionalityandtheabilitytoenableanddisablewithanexternallogicsignal.
图9-2showshowanexternallogicsignalcandriveENthroughRFAULTandmaintainauto-retryfunctionality.
Theresistor-capacitortimeconstantdeterminestheauto-retrytime-outperiod.
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Auto-RetryFunctionalityWithExternalENSignal9.
4.
4Two-LevelCurrent-LimitCircuitSomeapplicationsrequiredifferentcurrent-limitthresholdsdependingonexternalsystemconditions.
图9-3showsanimplementationforanexternallycontrolled,two-levelcurrent-limitcircuit.
Thecurrent-limitthresholdissetbythetotalresistancefromILIMtoGND(seeProgrammingtheCurrent-LimitThreshold).
Alogic-levelinputenablesanddisablesMOSFETQ1andchangesthecurrent-limitthresholdbymodifyingthetotalresistancefromILIMtoGND.
OnecanuseadditionalMOSFETandresistorcombinationsinparallelwithQ1andR2toincreasethenumberofadditionalcurrent-limitlevels.
CAUTIONNeverdriveILIMdirectlywithanexternalsignal.
图9-3.
Two-LevelCurrent-LimitCircuitwww.
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1ApplicationInformationThedevicesarecurrent-limited,power-distributionswitches.
TheylimittheoutputcurrenttoIOSwhenencounteringshortcircuitsorheavycapacitiveloads.
10.
2TypicalApplication,DesignforCurrentLimitTheuseoftheTPS2556-Q1andTPS2557-Q1devicesisasapowerswitchtolimittheoutputcurrent.
FAULTisanopendrainpulledhightoV(IN)witharesistor,ahostcanusetomonitorovercurrentorthermalshutdown.
图10-1.
ApplicationSchematicforCurrentLimit,TPS2556-Q110.
2.
1DesignRequirementsForthisdesignexample,usethefollowingastheinputparameters.
表10-1.
DesignParametersDESIGNPARAMETEREXAMPLEVALUEInputvoltage5VMinimumcurrentlimit3AMaximumcurrentlimit5A10.
2.
2DetailedDesignProcedure10.
2.
2.
1DetermineDesignParametersBeginningthedesignprocessrequiresdecidingonafewparameters.
Thedesignermustknowthefollowing:InputvoltageMinimumcurrentlimitMaximumcurrentlimit10.
2.
2.
2ProgrammingtheCurrent-LimitThresholdTheovercurrentthresholdisuser-programmableviaanexternalresistor.
TheTPS2556-Q1andTPS2557-Q1devicesuseaninternalregulationlooptoprovidearegulatedvoltageontheILIMterminal.
Thecurrent-limitthresholdisproportionaltothecurrentsourcedoutofILIM.
Therecommended1%resistorrangeforRILIMis20k≤R(ILIM)≤187ktoensurestabilityoftheinternalregulationloop.
Manyapplicationsrequirethattheminimumcurrentlimitbeaboveacertaincurrentlevelorthatthemaximumcurrentlimitbebelowacertaincurrentlevel,soitisimportanttoconsiderthetoleranceoftheovercurrentthresholdwhenselectingavalueforRILIM.
ThefollowingequationsapproximatetheresultingovercurrentthresholdforagivenvalueofexternalresistorRILIM.
ConsulttheElectricalCharacteristicstableforspecificcurrent-limitsettings.
ThetracesroutingtheRILIMresistortotheTPS2556-Q1andTPS2557-Q1devicesshouldbeasshortaspossibletoreduceparasiticeffectsonthecurrent-limitaccuracy.
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Current-LimitThresholdversusR(ILIM)10.
2.
2.
3SelectingCurrent-LimitResistor1Someapplicationsrequirethatcurrentlimitingnotoccurbelowacertainthreshold.
Forthisexample,assumethat3Amustbedeliveredtotheloadsothattheminimumdesiredcurrent-limitthresholdis3000mA.
UsetheIOSequationsand图10-2toselectR(ILIM).
(2)Selecttheclosest1%resistorlessthanthecalculatedvalue:R(ILIM)=33.
6k.
Thissetstheminimumcurrent-limitthresholdat3000mA.
UsetheIOSequations,图10-2,andthepreviouslycalculatedvalueforR(ILIM)tocalculatethemaximumresultingcurrent-limitthreshold.
(3)Theresultingmaximumcurrent-limitthresholdis3564mAwitha33.
6-kresistor.
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2.
2.
4SelectingCurrent-LimitResistor2Someapplicationsrequirethatcurrentlimitingmustoccurbelowacertainthreshold.
Forthisexample,assumethatthedesireduppercurrent-limitthresholdmustbebelow5,000mAtoprotectanupstreampowersupply.
UsetheIOSequationsand图10-2toselectR(ILIM).
(4)Selecttheclosest1%resistorgreaterthanthecalculatedvalue:R(ILIM)=23.
7k.
Thissetsthemaximumcurrent-limitthresholdat5000mA.
UsetheIOSequations,图10-2,andthepreviouslycalculatedvalueforRILIMtocalculatetheminimumresultingcurrent-limitthreshold.
(5)Theresultingminimumcurrent-limitthresholdis4406mAwitha23.
7-kresistor.
10.
2.
2.
5AccountingforResistorToleranceTheprevioussectionsdescribedtheselectionofRILIMgivencertainapplicationrequirementsandtheimportanceofunderstandingthecurrent-limitthresholdtolerance.
TheanalysisfocusedonlyontheTPS2556-Q1andTPS2557-Q1deviceperformanceandassumedanexactresistorvalue.
However,resistorssoldinquantityarenotexactandareboundedbyanupperandlowertolerancecenteredaroundanominalresistance.
TheadditionalRILIMresistancetolerancedirectlyaffectsthecurrent-limitthresholdaccuracyatasystemlevel.
Thefollowingtableshowsaprocessthataccountsforworst-caseresistortoleranceassuming1%resistorvalues.
Steponefollowstheselectionprocessoutlinedintheforegoingapplicationexamples.
Steptwodeterminestheupperandlowerresistanceboundsoftheselectedresistor.
StepthreeusestheupperandlowerresistorboundsintheIOSequationstocalculatethethresholdlimits.
Itisimportanttousetightertoleranceresistors,forexample0.
5%or0.
1%,whenprecisioncurrentlimitingisdesirable.
TPS2556-Q1,TPS2557-Q1ZHCSC61B–MARCH2014–REVISEDSEPTEMBER2020www.
ti.
com.
cn14SubmitDocumentFeedbackCopyright2021TexasInstrumentsIncorporatedProductFolderLinks:TPS2556-Q1TPS2557-Q1表10-2.
CommonRILIMResistorSelectionsDesiredNominalCurrentLimit(mA)IdealResistor(k)Closest1%Resistor(k)ResistorToleranceActualLimits1%low(k)1%high(k)IOSMIN(mA)IOSNOM(mA)IOSMAX(mA)750148.
1147145.
5148.
56327568811000111.
3110108.
9111.
185910111161125089.
188.
787.
889.
6107912561426150074.
37574.
375.
8128914861673175063.
763.
462.
864.
0154017601964200055.
856.
255.
656.
8174919862203225049.
649.
949.
450.
4198322382468250044.
744.
243.
844.
6225525282770275040.
740.
239.
840.
6249327813033300037.
337.
437.
037.
8269129913249325034.
434.
834.
535.
1290432153480350032.
031.
631.
331.
9321635423816375029.
930.
129.
830.
4338637203997400028.
02827.
728.
3365540004282425026.
426.
125.
826.
4393742934579450024.
924.
924.
725.
1413845014789475023.
623.
723.
523.
9436047305020500022.
422.
622.
422.
8458549615253525021.
421.
521.
321.
7483452165509550020.
420.
520.
320.
750835472576510.
2.
2.
6PowerDissipationandJunctionTemperatureThelowon-resistanceoftheN-channelMOSFETallowssmallsurface-mountpackagestopasslargecurrents.
Itisgooddesignpracticetoestimatepowerdissipationandjunctiontemperature.
Thefollowinganalysisgivesanapproximationforcalculatingjunctiontemperaturebasedonthepowerdissipationinthepackage.
However,itisimportanttonotethatthermalanalysisisstronglydependentonadditionalsystem-levelfactors.
Suchfactorsincludeairflow,boardlayout,copperthicknessandsurfacearea,andproximitytootherdevicesthatdissipatepower.
Goodthermaldesignpracticemustincludeallsystem-levelfactorsinadditiontoindividualcomponentanalysis.
BeginbydeterminingtherDS(on)oftheN-channelMOSFETrelativetotheinputvoltageandoperatingtemperature.
Asaninitialestimate,usethehighestoperatingambienttemperatureofinterestandreadrDS(on)fromthetypicalcharacteristicsgraph.
Usingthisvalue,calculatethepowerdissipationby:PD=rDS(on)*IOUT2where:PD=Totalpowerdissipation(W)rDS(on)=Power-switchon-resistance()I(OUT)=Maximumcurrent-limitthreshold(A)ThisstepcalculatesthetotalpowerdissipationoftheN-channelMOSFET.
Finally,calculatethejunctiontemperature:TJ=PD*RθJA+TAwhere:TA=Ambienttemperature(°C)www.
ti.
com.
cnTPS2556-Q1,TPS2557-Q1ZHCSC61B–MARCH2014–REVISEDSEPTEMBER2020Copyright2021TexasInstrumentsIncorporatedSubmitDocumentFeedback15ProductFolderLinks:TPS2556-Q1TPS2557-Q1RθJA=Thermalresistance(°C/W)PD=Totalpowerdissipation(W)Comparethecalculatedjunctiontemperaturewiththeinitialestimate.
Iftheyarenotwithinafewdegrees,repeatthecalculationusingtherefinedrDS(on)fromthepreviouscalculationasthenewestimate.
Twoorthreeiterationsaregenerallysufficienttoachievethedesiredresult.
ThefinaljunctiontemperatureishighlydependentonthermalresistanceRθJA,andthermalresistanceishighlydependentontheindividualpackageandboardlayout.
TheThermalInformationtableliststhermalresistancesofthedevicethatonecanusetohelpcalculatethethermalperformanceoftheboarddesign.
10.
2.
3ApplicationCurves图10-3.
TurnonDelayandRiseTime图10-4.
TurnoffDelayandFallTime图10-5.
DeviceEnabledIntoShortCircuit图10-6.
Full-LoadtoShort-CircuitTransientResponseTPS2556-Q1,TPS2557-Q1ZHCSC61B–MARCH2014–REVISEDSEPTEMBER2020www.
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com.
cn16SubmitDocumentFeedbackCopyright2021TexasInstrumentsIncorporatedProductFolderLinks:TPS2556-Q1TPS2557-Q1图10-7.
Short-CircuittoFull-LoadRecoveryResponse11PowerSupplyRecommendationsDesignofthedevicesisforoperationfromaninputvoltagesupplyrangeof2.
5Vto6.
5V.
Thecurrentcapabilityofthepowersupplyshouldexceedthemaximumcurrentlimitofthepowerswitch.
www.
ti.
com.
cnTPS2556-Q1,TPS2557-Q1ZHCSC61B–MARCH2014–REVISEDSEPTEMBER2020Copyright2021TexasInstrumentsIncorporatedSubmitDocumentFeedback17ProductFolderLinks:TPS2556-Q1TPS2557-Q112Layout12.
1LayoutGuidelinesForallapplications,TIrecommendsa0.
1-ForgreaterceramicbypasscapacitorbetweenINandGNDasclosetothedeviceaspossibleforlocalnoisedecoupling.
Thisprecautionreducesringingontheinputduetopower-supplytransients.
Theapplicationmayrequireadditionalinputcapacitanceontheinputtopreventvoltageovershootfromexceedingtheabsolute-maximumvoltageofthedeviceduringheavytransientconditions.
Outputcapacitanceisnotrequired,butTIrecommendsplacingahigh-valueelectrolyticcapacitorontheoutputpinwhenthereisanexpectationoflargetransientcurrentsontheoutput.
ThetracesroutingtheRILIMresistortothedeviceshouldbeasshortaspossibletoreduceparasiticeffectsonthecurrentlimitaccuracy.
ConnectthethermalpaddirectlytoPCBgroundplaneusingwideandshortcoppertrace.
12.
2LayoutExample图12-1.
TPS2556-Q1andTPS2557-Q1BoardLayoutTPS2556-Q1,TPS2557-Q1ZHCSC61B–MARCH2014–REVISEDSEPTEMBER2020www.
ti.
com.
cn18SubmitDocumentFeedbackCopyright2021TexasInstrumentsIncorporatedProductFolderLinks:TPS2556-Q1TPS2557-Q113DeviceandDocumentationSupport13.
1RelatedLinksThefollowingtablelistsquickaccesslinks.
Categoriesincludetechnicaldocuments,supportandcommunityresources,toolsandsoftware,andquickaccesstosampleorbuy.
表13-1.
RelatedLinksPARTSPRODUCTFOLDERSAMPLE&BUYTECHNICALDOCUMENTSTOOLS&SOFTWARESUPPORT&COMMUNITYTPS2556-Q1ClickhereClickhereClickhereClickhereClickhereTPS2557-Q1ClickhereClickhereClickhereClickhereClickhere13.
2Trademarks所有商标均为其各自所有者的财产.
13.
3ElectrostaticDischargeCautionThisintegratedcircuitcanbedamagedbyESD.
TexasInstrumentsrecommendsthatallintegratedcircuitsbehandledwithappropriateprecautions.
Failuretoobserveproperhandlingandinstallationprocedurescancausedamage.
ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.
Precisionintegratedcircuitsmaybemoresusceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications.
13.
4GlossaryTIGlossaryThisglossarylistsandexplainsterms,acronyms,anddefinitions.
www.
ti.
com.
cnTPS2556-Q1,TPS2557-Q1ZHCSC61B–MARCH2014–REVISEDSEPTEMBER2020Copyright2021TexasInstrumentsIncorporatedSubmitDocumentFeedback19ProductFolderLinks:TPS2556-Q1TPS2557-Q114Mechanical,Packaging,andOrderableInformationThefollowingpackaginginformationandaddendumreflectthemost-currentdataavailableforthedesignateddevices.
Thisdataissubjecttochangewithoutnoticeandwithoutrevisionofthisdocument.
TPS2556-Q1,TPS2557-Q1ZHCSC61B–MARCH2014–REVISEDSEPTEMBER2020www.
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com.
cn20SubmitDocumentFeedbackCopyright2021TexasInstrumentsIncorporatedProductFolderLinks:TPS2556-Q1TPS2557-Q1重要声明和免责声明TI提供技术和可靠性数据(包括数据表)、设计资源(包括参考设计)、应用或其他设计建议、网络工具、安全信息和其他资源,不保证没有瑕疵且不做出任何明示或暗示的担保,包括但不限于对适销性、某特定用途方面的适用性或不侵犯任何第三方知识产权的暗示担保.
这些资源可供使用TI产品进行设计的熟练开发人员使用.
您将独自承担以下全部责任:(1)针对您的应用选择合适的TI产品,(2)设计、验证并测试您的应用,(3)确保您的应用满足相应标准以及任何其他安全、安保或其他要求.
这些资源如有变更,恕不另行通知.
TI授权您仅可将这些资源用于研发本资源所述的TI产品的应用.
严禁对这些资源进行其他复制或展示.
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您应全额赔偿因在这些资源的使用中对TI及其代表造成的任何索赔、损害、成本、损失和债务,TI对此概不负责.
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TI提供这些资源并不会扩展或以其他方式更改TI针对TI产品发布的适用的担保或担保免责声明.
IMPORTANTNOTICE邮寄地址:TexasInstruments,PostOfficeBox655303,Dallas,Texas75265Copyright2020,德州仪器(TI)公司PACKAGEOPTIONADDENDUMwww.
ti.
com10-Dec-2020Addendum-Page1PACKAGINGINFORMATIONOrderableDeviceStatus(1)PackageTypePackageDrawingPinsPackageQtyEcoPlan(2)Leadfinish/Ballmaterial(6)MSLPeakTemp(3)OpTemp(°C)DeviceMarking(4/5)SamplesTPS2556QDRBRQ1ACTIVESONDRB83000RoHS&GreenNIPDAULevel-2-260C-1YEAR-40to1252556QTPS2556QDRBTQ1ACTIVESONDRB8250RoHS&GreenNIPDAULevel-2-260C-1YEAR-40to1252556QTPS2557QDRBRQ1ACTIVESONDRB83000RoHS&GreenNIPDAULevel-2-260C-1YEAR-40to1252557QTPS2557QDRBTQ1ACTIVESONDRB8250RoHS&GreenNIPDAULevel-2-260C-1YEAR-40to1252557Q(1)Themarketingstatusvaluesaredefinedasfollows:ACTIVE:Productdevicerecommendedfornewdesigns.
LIFEBUY:TIhasannouncedthatthedevicewillbediscontinued,andalifetime-buyperiodisineffect.
NRND:Notrecommendedfornewdesigns.
Deviceisinproductiontosupportexistingcustomers,butTIdoesnotrecommendusingthispartinanewdesign.
PREVIEW:Devicehasbeenannouncedbutisnotinproduction.
Samplesmayormaynotbeavailable.
OBSOLETE:TIhasdiscontinuedtheproductionofthedevice.
(2)RoHS:TIdefines"RoHS"tomeansemiconductorproductsthatarecompliantwiththecurrentEURoHSrequirementsforall10RoHSsubstances,includingtherequirementthatRoHSsubstancedonotexceed0.
1%byweightinhomogeneousmaterials.
Wheredesignedtobesolderedathightemperatures,"RoHS"productsaresuitableforuseinspecifiedlead-freeprocesses.
TImayreferencethesetypesofproductsas"Pb-Free".
RoHSExempt:TIdefines"RoHSExempt"tomeanproductsthatcontainleadbutarecompliantwithEURoHSpursuanttoaspecificEURoHSexemption.
Green:TIdefines"Green"tomeanthecontentofChlorine(Cl)andBromine(Br)basedflameretardantsmeetJS709Blowhalogenrequirementsof<=1000ppmthreshold.
Antimonytrioxidebasedflameretardantsmustalsomeetthe<=1000ppmthresholdrequirement.
(3)MSL,PeakTemp.
-TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksoldertemperature.
(4)Theremaybeadditionalmarking,whichrelatestothelogo,thelottracecodeinformation,ortheenvironmentalcategoryonthedevice.
(5)MultipleDeviceMarkingswillbeinsideparentheses.
OnlyoneDeviceMarkingcontainedinparenthesesandseparatedbya"~"willappearonadevice.
IfalineisindentedthenitisacontinuationofthepreviouslineandthetwocombinedrepresenttheentireDeviceMarkingforthatdevice.
(6)Leadfinish/Ballmaterial-OrderableDevicesmayhavemultiplematerialfinishoptions.
Finishoptionsareseparatedbyaverticalruledline.
Leadfinish/Ballmaterialvaluesmaywraptotwolinesifthefinishvalueexceedsthemaximumcolumnwidth.
ImportantInformationandDisclaimer:TheinformationprovidedonthispagerepresentsTI'sknowledgeandbeliefasofthedatethatitisprovided.
TIbasesitsknowledgeandbeliefoninformationprovidedbythirdparties,andmakesnorepresentationorwarrantyastotheaccuracyofsuchinformation.
Effortsareunderwaytobetterintegrateinformationfromthirdparties.
TIhastakenandPACKAGEOPTIONADDENDUMwww.
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com10-Dec-2020Addendum-Page2continuestotakereasonablestepstoproviderepresentativeandaccurateinformationbutmaynothaveconducteddestructivetestingorchemicalanalysisonincomingmaterialsandchemicals.
TIandTIsuppliersconsidercertaininformationtobeproprietary,andthusCASnumbersandotherlimitedinformationmaynotbeavailableforrelease.
InnoeventshallTI'sliabilityarisingoutofsuchinformationexceedthetotalpurchasepriceoftheTIpart(s)atissueinthisdocumentsoldbyTItoCustomeronanannualbasis.
TAPEANDREELINFORMATION*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQReelDiameter(mm)ReelWidthW1(mm)A0(mm)B0(mm)K0(mm)P1(mm)W(mm)Pin1QuadrantTPS2556QDRBRQ1SONDRB83000330.
012.
43.
33.
31.
18.
012.
0Q2TPS2556QDRBTQ1SONDRB8250180.
012.
43.
33.
31.
18.
012.
0Q2TPS2557QDRBRQ1SONDRB83000330.
012.
43.
33.
31.
18.
012.
0Q2TPS2557QDRBTQ1SONDRB8250180.
012.
43.
33.
31.
18.
012.
0Q2PACKAGEMATERIALSINFORMATIONwww.
ti.
com31-Jul-2020PackMaterials-Page1*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQLength(mm)Width(mm)Height(mm)TPS2556QDRBRQ1SONDRB83000367.
0367.
035.
0TPS2556QDRBTQ1SONDRB8250210.
0185.
035.
0TPS2557QDRBRQ1SONDRB83000367.
0367.
035.
0TPS2557QDRBTQ1SONDRB8250210.
0185.
035.
0PACKAGEMATERIALSINFORMATIONwww.
ti.
com31-Jul-2020PackMaterials-Page2www.
ti.
comPACKAGEOUTLINEC8X0.
350.
252.
40.
052X1.
951.
650.
056X0.
651MAX8X0.
50.
30.
050.
00A3.
12.
9B3.
12.
9(0.
2)TYPVSON-1mmmaxheightDRB0008BPLASTICSMALLOUTLINE-NOLEAD4218876/A12/2017PIN1INDEXAREASEATINGPLANE0.
08C1458(OPTIONAL)PIN1ID0.
1CAB0.
05CTHERMALPADEXPOSEDNOTES:1.
Alllineardimensionsareinmillimeters.
Anydimensionsinparenthesisareforreferenceonly.
DimensioningandtolerancingperASMEY14.
5M.
2.
Thisdrawingissubjecttochangewithoutnotice.
3.
Thepackagethermalpadmustbesolderedtotheprintedcircuitboardforthermalandmechanicalperformance.
SCALE4.
000www.
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comEXAMPLEBOARDLAYOUT0.
07MINALLAROUND0.
07MAXALLAROUND8X(0.
3)(2.
4)(2.
8)6X(0.
65)(1.
65)(0.
2)VIATYP(0.
575)(0.
95)8X(0.
6)(R0.
05)TYPVSON-1mmmaxheightDRB0008BPLASTICSMALLOUTLINE-NOLEAD4218876/A12/2017SYMM1458LANDPATTERNEXAMPLESCALE:20XNOTES:(continued)4.
Thispackageisdesignedtobesolderedtoathermalpadontheboard.
Formoreinformation,seeTexasInstrumentsliteraturenumberSLUA271(www.
ti.
com/lit/slua271).
5.
Viasareoptionaldependingonapplication,refertodevicedatasheet.
Ifanyviasareimplemented,refertotheirlocationsshownonthisview.
Itisrecommendedthatviasunderpastebefilled,pluggedortented.
SOLDERMASKOPENINGSOLDERMASKMETALUNDERSOLDERMASKDEFINEDMETALSOLDERMASKOPENINGSOLDERMASKDETAILSNONSOLDERMASKDEFINED(PREFERRED)www.
ti.
comEXAMPLESTENCILDESIGN(R0.
05)TYP8X(0.
3)8X(0.
6)(1.
47)(1.
06)(2.
8)(0.
63)6X(0.
65)VSON-1mmmaxheightDRB0008BPLASTICSMALLOUTLINE-NOLEAD4218876/A12/2017NOTES:(continued)6.
Lasercuttingapertureswithtrapezoidalwallsandroundedcornersmayofferbetterpasterelease.
IPC-7525mayhavealternatedesignrecommendations.
SOLDERPASTEEXAMPLEBASEDON0.
125mmTHICKSTENCILEXPOSEDPAD81%PRINTEDSOLDERCOVERAGEBYAREASCALE:25XSYMM1458METALTYPSYMM重要声明和免责声明TI提供技术和可靠性数据(包括数据表)、设计资源(包括参考设计)、应用或其他设计建议、网络工具、安全信息和其他资源,不保证没有瑕疵且不做出任何明示或暗示的担保,包括但不限于对适销性、某特定用途方面的适用性或不侵犯任何第三方知识产权的暗示担保.
这些资源可供使用TI产品进行设计的熟练开发人员使用.
您将自行承担以下全部责任:(1)针对您的应用选择合适的TI产品,(2)设计、验证并测试您的应用,(3)确保您的应用满足相应标准以及任何其他安全、安保或其他要求.
这些资源如有变更,恕不另行通知.
TI授权您仅可将这些资源用于研发本资源所述的TI产品的应用.
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您应全额赔偿因在这些资源的使用中对TI及其代表造成的任何索赔、损害、成本、损失和债务,TI对此概不负责.
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IMPORTANTNOTICE邮寄地址:上海市浦东新区世纪大道1568号中建大厦32楼,邮政编码:200122Copyright2021德州仪器半导体技术(上海)有限公司