參數(shù)資料
型號(hào)： LTC4266CUHF#PBF
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： LTC4266CUHF#PBF
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.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC4266IGW#PBF 功能描述:IC CTRLR IEEE 802.3AT 36-SSOP 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
LTC4266IGW#TRPBF 制造商:Linear Technology 功能描述:Power Over Ethernet Controller 36-Pin SSOP W T/R 制造商:Linear Technology 功能描述:MS-Hot Swap/POE, PoE+ 25.5W Quad PSE Controller
LTC4266IUHF#PBF 制造商:Linear Technology 功能描述:POE Controller 25.5W 38-Pin QFN EP 制造商:Linear Technology 功能描述:IC POE 802.3AT QUAD PSE 38-QFN 制造商:Linear Technology 功能描述:POE CNTRL QUAD 25.5W 1MHZ 制造商:Linear Technology 功能描述:IC, POE CONTROLLER, 3.3V, QFN-38; Input Voltage:3.3V; Supply Current:-2.4mA; UVLO:25V; Digital IC Case Style:QFN; No. of Pins:38; Frequency:1MHz; Operating Temperature Min:-40C; Operating Temperature Max:85C; MSL:MSL 1 - Unlimited ;RoHS Compliant: Yes
LTC4266IUHF#TRPBF 制造商:Linear Technology 功能描述:POE Controller 25.5W 38-Pin QFN EP
LTC4267 制造商:LINER 制造商全稱:Linear Technology 功能描述:Quad IEEE 802.3at Power over Ethernet Controller
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