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参数资料
| 型号： | LTC4266IUHF#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY MANAGEMENT CKT, PQCC38 |
| 封装： | 5 X 7 MM, LEAD FREE, PLASTIC, MO-220WHKD, QFN-38 |
| 文件页数： | 8/30页 |
| 文件大小： | 414K |
| 代理商： | LTC4266IUHF#PBF |
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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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相关代理商/技术参数 |
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|---|---|
| LTC4267 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Quad IEEE 802.3at Power over Ethernet Controller |
| LTC4267-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator |
| LTC4267-3 | 制造商:LINER 制造商全称: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 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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