參數(shù)資料
型號(hào)： LTC4266IUHF#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： POWER SUPPLY MANAGEMENT CKT, PQCC38
封裝： 5 X 7 MM, LEAD FREE, PLASTIC, MO-220WHKD, QFN-38
文件頁(yè)數(shù)： 15/30頁(yè)
文件大?。?/td> 414K
代理商： LTC4266IUHF#TRPBF
LTC4266
4266fa
ApplicAtions inForMAtion
MOSFETFaultDetection
LTC4266PSEportsaredesignedtotoleratesignificant
levelsofabuse,butinextremecasesitispossiblefor
theexternalMOSFETtobedamaged.AfailedMOSFET
mayshortsourcetodrain,whichwillmaketheportap-
peartobeonwhenitshouldbeoff;thisconditionmay
alsocausethesenseresistortofuseopen,turningoff
theportbutcausingtheLTC4266SENSEpintoriseto
anabnormallyhighvoltage.AfailedMOSFETmayalso
shortfromgatetodrain,causingtheLTC4266GATEpin
torisetoanabnormallyhighvoltage.TheLTC4266SENSE
andGATEpinsaredesignedtotolerateupto80Vfaults
withoutdamage.
IftheLTC4266seesanyoftheseconditionsformorethan
180μs,itdisablesallportfunctionality,reducesthegate
drivepull-downcurrentfortheportandreportsaFETBad
fault.Thisistypicallyapermanentfault,butthehostcan
attempttorecoverbyresettingtheport,orbyresetting
theentirechipifaportresetfailstoclearthefault.Ifthe
MOSFETisinfactbad,thefaultwillquicklyreturn,and
theportwilldisableitselfagain.Theremainingportsof
theLTC4266areunaffected.
AnopenormissingMOSFETwillnottriggeraFETBad
fault,butwillcauseatSTARTfaultiftheLTC4266attempts
toturnontheport.
VoltageandCurrentReadback
TheLTC4266measurestheoutputvoltageandcurrent
ateachportwithaninternalA/Dconverter.Portdatais
onlyvalidwhentheportpowerison.Theconverterhas
twomodes:
Slowmode:14samplespersecond,14.5bitsresolution
Fastmode:440samplespersecond,9.5bitsresolution
Infastmode,theleastsignificant5bitsofthelowerbyteare
zeroessothatbitscalingisthesameinbothmodes.
Disconnect
TheLTC4266monitorstheporttomakesurethatthePD
continuestodrawtheminimumspecifiedcurrent.Adis-
connecttimercountsupwheneverportcurrentisbelow
7.5mA(typ),indicatingthatthePDhasbeendisconnected.
IfthetDIStimerexpires,theportwillbeturnedoffand
thedisconnectbitinthefaulteventregisterwillbeset.
IfthecurrentreturnsbeforethetDIStimerrunsout,the
timerresetsandwillstartcountingfromthebeginning
iftheundercurrentconditionreturns.AslongasthePD
exceedstheminimumcurrentlevelmoreoftenthantDIS,
itwillstaypowered.
Althoughnotrecommended,theDCdisconnectfeature
can be disabled by clearing the corresponding enable
bits.Notethatthisdefeatstheprotectionmechanisms
builtintotheIEEEspec,sinceapoweredportwillstay
poweredafterthePDisremoved.Ifthestill-poweredport
issubsequentlyconnectedtoanon-PoEdatadevice,the
devicemaybedamaged.
TheLTC4266doesnotincludeACdisconnectcircuitry,but
includesACdisconnectenablebitstomaintaincompat-
ibilitywiththeLTC4259A.IftheACdisconnectenablebits
areset,DCdisconnectwillbeused.
ShutdownPins
TheLTC4266includesahardwareSHDNpinforeachport.
WhenaSHDNpinispulledtoDGND,thecorresponding
portwillbeshutoffimmediately.Theportremainsshut
downuntilre-enabledviaI2Coradeviceresetinauto
mode.
MaskedShutdown
TheLTC4266providesalowlatencyportsheddingfea-
turetoquicklyreducethesystemloadwhenrequired.By
allowingapre-determinedsetofportstobeturnedoff,
thecurrentonanoverloadedmainpowersupplycanbe
reducedrapidlywhilekeepinghighprioritydevicespow-
ered.Eachportcanbeconfiguredtohighorlowpriority;
alllow-priorityportswillshutdownwithin6.5μsafter
theMSDpinispulledlow.IfmultipleportsinaLTC4266
deviceareshutdownviaMSD,theyarestaggeredbyat
least0.55μstohelpreducevoltagetransientsonthemain
supply.IfaportisturnedoffviaMSD,thecorresponding
detection and classification enable bits are cleared, so
theportwillremainoffuntilthehostexplicitlyre-enables
detection.
相關(guān)PDF資料
PDF描述
LTC4266CUHF#PBF POWER SUPPLY MANAGEMENT CKT, PQCC38
LTC500-4MM LOW PASS FILTER
LTC6603CUF#PBF LOW PASS FILTER
LTC6603CUF#TRPBF LOW PASS FILTER
LTC6603IUF#PBF LOW PASS FILTER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC4267 制造商:LINER 制造商全稱:Linear Technology 功能描述:Quad IEEE 802.3at Power over Ethernet Controller
LTC4267-1 制造商:LINER 制造商全稱:Linear Technology 功能描述:Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator
LTC4267-3 制造商:LINER 制造商全稱:Linear Technology 功能描述:Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator
LTC4267CDHC 制造商:Linear Technology 功能描述:Hot Swap Controller 1-CH -57V 16-Pin DFN EP
LTC4267CDHC#PBF 功能描述:IC POE 802.3AF INTERFACE 16-DFN RoHS:是 類別:集成電路 (IC) >> 接口 - 控制器 系列:- 標(biāo)準(zhǔn)包裝:2,450 系列:- 控制器類型:SPI 總線至 I²C 總線橋接 接口:I²C，串行，SPI 電源電壓:2.4 V ~ 3.6 V 電流 - 電源:11mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-HVQFN（4x4） 包裝:托盤 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名稱:935286452157SC18IS600IBSSC18IS600IBS-ND
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*