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)： 8/30頁(yè)
文件大小： 414K
代理商： LTC4266CUHF#PBF
LTC4266
4266fa
operAtion
morepowerthatthePSEhasavailable.Theclassification
stepisoptional;ifaPSEchoosesnottoclassifyaPD,it
mustassumethatthePDisa13W(full802.3afpower)
device.
Newin802.3at
Thenewer802.3atstandardsupersedes802.3afandbrings
severalnewfeatures:
APDmaydrawasmuchas25.5W.SuchPDs(andthe
PSEsthatsupportthem)areknownasType2.Older
13W802.3afequipmentisclassifiedasType1.Type1
PDswillworkwithallPSEs;Type2PDsmayrequire
Type2PSEstoworkproperly.TheLTC4266isdesigned
toworkinbothType1andType2PSEdesigns,and
alsosupportsnon-standardconfigurationsathigher
powerlevels.
TheClassificationprotocolisexpandedtoallowType2
PSEstodetectType2PDs,andtoallowType2PDsto
determineiftheyareconnectedtoaType2PSE.Two
versionsofthenewClassificationprotocolareavail-
able:anexpandedversionofthe802.3afClassPulse
protocol,andanalternatemethodintegratedwiththe
existingLLDPprotocol(usingtheEthernetdatapath).
TheLTC4266fullysupportsthenewClassPulseprotocol
andisalsocompatiblewiththeLLDPprotocol(which
isimplementedinthedatacommunicationslayer,not
inthePoEcircuitry).
Faultprotectioncurrentlevelsandtimingareadjusted
toreducepeakpowerintheMOSFETduringafault;
thisallowsthenew25.5Wpowerlevelstobereached
usingthesameMOSFETsasolder13Wdesigns.
BACKWARDSCOMPATIBILITY
TheLTC4266isdesignedtobebackwardcompatiblewith
earlierPSEchipsinbothsoftwareandpinfunctions.Exist-
ingsystemsusingeithertheLTC4258orLTC4259A(or
compatible)devicescanbesubstitutedwiththeLTC4266
withoutsoftwareorPCBlayoutchanges;onlyminorBOM
changes are required to implement a fully compliant
802.3atdesign.
Becauseofthebackwardscompatibilityfeatures,someof
theinternalregistersareredundantorunusedwhenthe
LTC4266isoperatedasrecommended.Formoredetails
onusageincompatibilitymode,refertotheLTC4258/
LTC4259Adevicedatasheets.
SpecialCompatibilityModeNotes
The LTC4266 can use either 0.5Ω or 0.25Ω sense
resistors,whiletheLTC425xchipsalwaysused0.5Ω.
Tomaintaincompatibility,iftheAUTOpinislowwhen
theLTC4266powersupitassumesthesenseresistor
is0.5Ω;ifitishighatpowerup,theLTC4266assumes
0.25Ω.Theresistorvaluesettingcanbereconfigured
atanytimeafterpowerup.Inparticular,systemsthat
use0.25ΩsenseresistorsandhaveAUTOtiedlow
mustreconfiguretheresistorsettingsafterpowerup.
TheLTC4259AincludedbothACandDCdisconnect
sensingcircuitry,buttheLTC4266hasonlyDCdiscon-
nect sensing. For the sake of compatibility, register
bitsusedtoenableACdisconnectintheLTC4259Aare
implementedintheLTC4266,buttheysimplymirror
thebitsusedforDCdisconnect.
The LTC4258 and LTC4259A required 10k resistors
betweentheOUTnpinsandthedrainsoftheexternal
MOSFETs.Theseresistorsmustbeshortedorreplaced
withzeroohmjumperswhenusingtheLTC4266.
TheLTC4258andLTC4259AincludedaBYPpin,de-
coupledtoAGNDwith0.1F.ThispinchangestotheMID
pinontheLTC4266.Thecapacitorshouldberemoved
forEndspanapplications,orreplacedwithazeroohm
jumperforMidspanapplications.
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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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