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参数资料
| 型号： | LTC4266CGW#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY MANAGEMENT CKT, PDSO36 |
| 封装： | 0.300 INCH, LEAD FREE, PLASTIC, SSOP-36 |
| 文件页数： | 9/30页 |
| 文件大小： | 414K |
| 代理商： | LTC4266CGW#TRPBF |
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LTC4266
4266fa
ApplicAtions inForMAtion
OperatingModes
TheLTC4266includesfourindependentports,eachof
whichcanoperateinoneoffourmodes:Manual,Semi-
auto,Auto,orShutdown.
Inmanualmode,theportwaitsforinstructionsfromthe
hostsystembeforetakinganyaction.Itrunsasingle
detectionorclassificationcyclewhencommandedto
bythehost,andreportstheresultinitsPortStatus
register.Thehostsystemcancommandtheportto
turnonoroffthepoweratanytime.
In semi-auto mode, the port repeatedly attempts to
detectandclassifyanyPDattachedtoit.Itreportsthe
statusoftheseattemptsbacktothehost,andwaitsfor
acommandfromthehostbeforeturningonpowerto
theport.Thehostmustenabledetection(andoptionally
classification)fortheportbeforedetectionwillstart.
AutomodeoperatesthesameasSemi-automodeexcept
thatitwillautomaticallyturnonthepowertotheport
ifdetectionissuccessful.
Inshutdownmode,theportisdisabledandwillnot
detectorpoweraPD.
Regardlessofwhichmodeitisin,theLTC4266willremove
powerautomaticallyfromanyportthatgeneratesacurrent
limitfault.Itwillalsoautomaticallyremovepowerfrom
anyportthatgeneratesadisconnecteventifdisconnect
detectionisenabled.Thehostcontrollermayalsocom-
mandtheporttoremovepoweratanytime.
Power-OnResetandtheAUTO/MIDpins
TheinitialLTC4266configurationdependsonthestate
oftheAUTOandMIDpinsduringreset.Resetoccursat
power-up,orwhenevertheRESETpinispulledloworthe
globalResetAllbitisset.NotethattheAUTOpinisonly
sampledwhenaresetoccurs.ChangingthestateofAUTO
orMIDafterpower-upwillnotchangetheportbehavior
oftheLTC4266untilaresetoccurs.
Althoughtypicallyusedwithahostcontroller,theLTC4266
canalsobeusedinastandalonemodewithnoconnection
totheserialinterface.Ifthereisnohostpresent,theAUTO
pinshouldbetiedhighsothat,atreset,allportswillbe
configuredtooperateautomatically.Eachportwilldetect
andclassifyrepeatedlyuntilaPDisdiscovered,setICUT
andILIMaccordingtotheclassificationresults,applypower
aftersuccessfuldetection,andremovepowerwhenaPD
isdisconnected.Similarly,ifthestandaloneapplication
isamidspan,theMIDpinshouldbetiedhightoenable
correctmidspandetectiontiming.
Table 1 shows the ICUT and ILIM values that will be
automaticallysetinstandalonemode,basedonthedis-
coveredclass.
Table1.ICUTandILIMValuesinStandaloneMode
CLASS
ICUT
ILIM
Class1
112mA
425mA
Class2
206mA
425mA
Class3orClass0
375mA
425mA
Class4
638mA
850mA
TheautomaticsettingoftheICUTandILIMvaluesonlyoc-
cursiftheLTC4266isresetwiththeAUTOpinhigh.
DETECTION
DetectionOverview
Toavoiddamagingnetworkdevicesthatwerenotdesigned
totolerateDCvoltage,aPSEmustdeterminewhetherthe
connecteddeviceisarealPDbeforeapplyingpower.The
IEEEspecificationrequiresthatavalidPDhaveacommon-
moderesistanceof25k±5%atanyportvoltagebelow
10V.ThePSEmustacceptresistancesthatfallbetween
19kand26.5k,anditmustrejectresistancesabove
33korbelow15k(shadedregionsinFigure11).The
PSEmaychoosetoacceptorrejectresistancesinthe
undefinedareasbetweenthemust-acceptandmust-reject
ranges.Inparticular,thePSEmustrejectstandardcomputer
networkports,manyofwhichhave150Ωcommon-mode
terminationresistorsthatwillbedamagedifpowerisap-
pliedtothem(theblackregionattheleftofFigure11).
RESISTANCE
PD
PSE
0
10k
15k
4266 F11
19k
26.5k
26.25k
23.75k
150 (NIC)
20k
30k
33k
Figure11.IEEE802.3afSignatureResistanceRanges
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4266CIUHF#PBF | 功能描述:IC CONTROLLER PSE QUAD 38-QFN RoHS:是 类别:集成电路 (IC) >> 接口 - 控制器 系列:- 标准包装:2,450 系列:- 控制器类型:SPI 总线至 I²C 总线桥接 接口:I²C，串行，SPI 电源电压:2.4 V ~ 3.6 V 电流 - 电源:11mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-HVQFN（4x4） 包装:托盘 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名称:935286452157SC18IS600IBSSC18IS600IBS-ND |
| LTC4266CIUHF#TRPBF | 功能描述:IC CONTROLLER PSE QUAD 38-QFN RoHS:是 类别:集成电路 (IC) >> 接口 - 控制器 系列:- 标准包装:2,450 系列:- 控制器类型:SPI 总线至 I²C 总线桥接 接口:I²C，串行，SPI 电源电压:2.4 V ~ 3.6 V 电流 - 电源:11mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-HVQFN（4x4） 包装:托盘 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名称:935286452157SC18IS600IBSSC18IS600IBS-ND |
| LTC4266CUHF#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 CONTROLLER 3.3V QFN-38 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:0C; Operating Temperature Max:70C; MSL:MSL 1 - Unlimited ;RoHS Compliant: Yes |
| LTC4266CUHF#TRPBF | 制造商:Linear Technology 功能描述:POE Controller 25.5W 38-Pin QFN EP |
| LTC4266IGW#PBF | 功能描述:IC CTRLR IEEE 802.3AT 36-SSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 控制器 系列:- 标准包装:2,450 系列:- 控制器类型:SPI 总线至 I²C 总线桥接 接口:I²C，串行，SPI 电源电压:2.4 V ~ 3.6 V 电流 - 电源:11mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-HVQFN（4x4） 包装:托盘 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名称:935286452157SC18IS600IBSSC18IS600IBS-ND |
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