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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： | 16/30页 |
| 文件大小： | 414K |
| 代理商： | LTC4266CGW#TRPBF |
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LTC4266
4266fa
SERIALDIGITALINTERFACE
Overview
TheLTC4266communicateswiththehostusingastandard
SMBus/I2C2-wireinterface.TheLTC4266isaslave-only
device,andcommunicateswiththehostmasterusing
thestandardSMBusprotocols.Interruptsaresignaledto
thehostviatheINTpin.TheTimingDiagrams(Figures6
through10)showtypicalcommunicationwaveformsand
their timing relationships. More information about the
SMBusdataprotocolscanbefoundatwww.smbus.org.
TheLTC4266requiresboththeVDDandVEEsupplyrails
tobepresentfortheserialinterfacetofunction.
BusAddressing
TheLTC4266’sprimaryserialbusaddressis010xxxxb,with
thelowerfourbitssetbytheAD3-AD0pins;thisallowsup
to16LTC4266sonasinglebus.AllLTC4266salsorespond
totheaddress0110000b,allowingthehosttowritethe
samecommand(typicallyconfigurationcommands)to
multipleLTC4266sinasingletransaction.IftheLTC4266
isassertingtheINTpin,itwillalsorespondtothealert
responseaddress(0001100b)pertheSMBusspec.
InterruptsandSMBAlert
MostLTC4266porteventscanbeconfiguredtotrigger
aninterrupt,assertingtheINTpinandalertingthehost
totheevent.Thisremovestheneedforthehosttopoll
theLTC4266,minimizingserialbustrafficandconserving
hostCPUcycles.MultipleLTC4266scanshareacommon
INTline,withthehostusingtheSMBAlertprotocol(ARA)
todeterminewhichLTC4266causedaninterrupt.
RegisterDescription
Forinformationonserialbususageanddeviceconfigura-
tionandstatus,refertotheLTC4266SoftwareProgram-
mingdocumentation.
EXTERNALCOMPONENTSELECTION
PowerSuppliesandBypassing
TheLTC4266requirestwosupplyvoltagestooperate.VDD
requires3.3V(nominally)relativetoDGND.VEErequiresa
negativevoltageofbetween–44Vand–57VforType1PSEs,
or–50Vto–57VforType2PSEs,relativetoAGND.The
relationshipbetweenthetwogroundsisnotfixed;AGND
canbereferencedtoanylevelfromVDDtoDGND,although
itshouldtypicallybetiedtoeitherVDDorDGND.
VDDprovidespowerformostoftheinternalLTC4266cir-
cuitry,anddrawsamaximumof3mA.Aceramicdecoupling
capofatleast0.1μFshouldbeplacedfromVDDtoDGND,
ascloseaspracticaltoeachLTC4266chip.
Figure16showsathreecomponentlowdropoutregulator
foranegativesupplytoDGNDgeneratedfromthenegative
VEEsupply.VDDistiedtoAGNDandDGNDisnegative
referencedtoAGND.ThisregulatordrivesasingleLTC4266
device.InFigure17,DGNDistiedtoAGNDinthisboost
convertercircuitforapositiveVDDsupplyof3.3Vabove
AGND.ThiscircuitcandrivemultipleLTC4266devices
andoptocouplers.
ApplicAtions inForMAtion
4266 F16
R5
750k
D1
CMHZ4687-4.3V
C1
0.1F
Q2
CMPTA92
VEE
VDD
LTC4266
AGND
VEE
AGND
DGND
Figure16.NegativeLDOtoDGND
VEEisthemainsupplythatprovidespowertothePDs.
Becauseitsuppliesarelativelylargeamountofpowerand
issubjecttosignificantcurrenttransients,itrequiresmore
designcarethanasimplelogicsupply.ForminimumIR
lossandbestsystemefficiency,setVEEnearmaximum
amplitude(57V),leavingenoughmargintoaccountfor
transientover-orundershoot,temperaturedrift,andtheline
regulationspecsoftheparticularpowersupplyused.
BypasscapacitancebetweenAGNDandVEEisveryim-
portantforreliableoperation.Ifashortcircuitoccursat
oneoftheoutputportsitcantakeaslongas1μsforthe
LTC4266tobeginregulatingthecurrent.Duringthistime
thecurrentislimitedonlybythesmallimpedancesinthe
circuitandahighcurrentspiketypicallyoccurs,causinga
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相关代理商/技术参数 |
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| 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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