TPS61099BQ25100AMSP430
FR2100
BQ24073LDO
TPS7A05USB+Charging CaseEarbud2.5V
USB-
1ZHCU499–May2018TIDUEA6—/sc/techlit/TIDUEA6无线耳塞电池充电器超低待机功耗参考设计TIDesigns:TIDA-050007无线耳塞电池充电器超低待机功耗参考设计
说明全新的无线耳塞通过其便携盒内的电池充电,这一独特的设计需要小尺寸的解决方案以及高效组件。此外,随着市场需求的增加,商家会更加积极地推出功能相同但价格更为低廉的产品。这一超低功耗参考设计包含了一个通过USB输入供电的充电盒电池和升压转换器。资源TIDA-050007设计文件夹TPS61099产品文件夹BQ24073产品文件夹BQ25100A产品文件夹MSP430FR2100产品文件夹TPS7A05产品文件夹TLV713P产品文件夹
咨询我们的E2E™专家特性•18µA超低待机电流•充电盒最高可提供1.5A快速充电电流•在输入高于输出时,支持直通模式。•充电效率超过85%•小尺寸解决方案•支持的耳塞充电电流最低为1mA应用•充电盒•便携式音频产品
该TI参考设计末尾的重要声明表述了授权使用、知识产权问题和其他重要的免责声明和信息。
2ZHCU499–May2018TIDUEA6—/sc/techlit/TIDUEA6无线耳塞电池充电器超低待机功耗参考设计1KeySystemSpecifications表1.KeySystemSpecificationsPARAMETERTESTCONDITIONVALUEChargingCaseStandbyCurrentNoUSBinput,noloadatboostoutput.<20uAFastChargingCurrent,VBAT1–40°Cto85°C,5VUSB600mAChargingTerminationCurrent,VBAT1–40°Cto85°C,5VUSB10mAFastChargingCurrent,VBAT2–40°Cto85°C,4.5VInput192mAChargingTerminationCurrent,VBAT2–40°Cto85°C,4.5VInput2mAEfficiency,VBAT1input(4.0V)toVBAT2output(3.6V)>80%Efficiency,VBAT1input(4.0V)toVBAT2output(4.0V)>80%Efficiency,VBAT1input(4.0V)toVBAT2output(4.2V)>80%2SystemDescriptionThefast-growingmarketofchargingcasesbringsbigopportunitiesaswellaschallengesforthepowerdesigner.Thelimitedproductsizedrivesthepowerefficiencytobeverycritical.Hugevolumesalsodrivesthemarkettobecost-sensitive.Agoodtradeoffshouldbemadebetweenthesolutioncostandperformance.Atahighlevel,thisreferencedesignconsistsofaboostconverter,alinearregulator,anMCUandthreechargers.Toachievethetargetofultra-lowstandbycurrent,allthecomponentsshouldsupportultralowpoweroperationmode.InthisUltra-lowStandbyPowerReferenceDesign,achargergetspowerfromtheUSBinputandchargesthechargingcasebattery(BAT1)asshowninFigure1blockdiagram.Thischargersuppliestheboostconverteraswell.Theboostconverterboostsuptheinputvoltage,suppliedfromtheOUTpinofthecharger,toprovidepowertothebatteriesdownstreamintheearbuds.Chargersarealsoneededintheearbudstogetpowerfromtheoutputoftheboostconvertertochargethebatteriesintheearbuds(BAT2).Mostapplicationshavea5.0-Vfixedboostoutputvoltage,significantlyreducingthechargingefficiency,especiallywhenBAT1ishigherthanBAT2.Thedesigndescribedhereprovidesanewsolutiontoextendthechargingcyclesbyadoptinganinnovationalpass-throughmodeanddynamicallyadjustingtheoutputvoltageoftheboostconverter.Tobalancethecostandefficiency,thelinearchargersareadoptedinboththechargingcaseandearbuds.Thelinearchargerinthechargingcaseshouldsupportatleast1Aloadandsupportspowerpathdynamicmanagementfunction.BecausemostoftheBAT1batteryhasacapacityhigherthan400mA·Hthischargershouldprovidethepowertotheboostconverteratthesametime.Thelinearchargersintheearbudscanbepackagedinaverytinysizebecausethechargingcurrentislessthan200mA.EnabledbyTI'sultra-lowpowerdevices(BoostConverter,Linearregulator,Linearcharger,andFRAMMicrocontroller(MCU)),thisTIDesignachieveslessthan20µAstandbycurrenttoextendcharging-casebatterylifetime.Lessthan1.6%batterycapacityisconsumedbythisstandbycurrenteachmonthfora600mA·Hbattery.