參數(shù)資料
型號： 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
文件頁數(shù)： 14/30頁
文件大小： 414K
代理商： LTC4266CUHF#PBF
LTC4266
4266fa
ApplicAtions inForMAtion
PertheIEEEspecification,theLTC4266willautomatically
setILIMto425mA(showninboldinTable4)duringinrush
atportturn-on,andthenswitchtotheprogrammedILIM
setting once inrush has completed. To maintain IEEE
compliance,ILIMshouldkeptat425mAforallType1PDs,
and850mAifaType2PDisdetected.ILIMisautomatically
resetto425mAwhenaportturnsoff.
Table4.ExampleCurrentLimitSettings
ILIM(mA)
INTERNALREGISTERSETTING(hex)
RSENSE=0.5Ω
RSENSE=0.25Ω
53
88
106
08
88
159
89
213
80
08
266
8A
319
09
89
372
8B
425
00
80
478
8E
531
92
8A
584
CB
638
10
90
744
D2
9A
850
40
C0
956
4A
CA
1063
50
D0
1169
5A
DA
1275
60
E0
1488
52
49
1700
40
1913
4A
2125
50
2338
5A
2550
60
2975
52
ILIMFoldback
TheLTC4266featuresatwo-stagefoldbackcircuitthat
reducestheportcurrentiftheportvoltagefallsbelow
thenormaloperatingvoltage.ThiskeepsMOSFETpower
dissipationatsafelevelsfortypical802.3afMOSFETs,
evenatextended802.3atpowerlevels.Currentlimitand
foldbackbehaviorareprogrammableonaper-portbasis.
Figure14showsMOSFETpowerdissipationwith802.3af-
stylefoldbackcomparedwithatypicalMOSFETSOAcurve;
Figure15demonstrateshowtwo-stagefoldbackkeepsthe
FETwithinitsSOAunderthesameconditions.Table4gives
examplesofrecommendedILIMregistersettings.
TheLTC4266willsupportcurrentlevelswellbeyondthe
maximumvaluesinthe802.3atspecification.Theshaded
areasinTable4indicatesettingsthatmayrequirealarger
externalMOSFET,additionalheatsinking,orareduced
tLIMsetting.
PD Voltage (V) at VPSE = 58V
0
0.0
PSE
Current
(A)
0.2
0.4
0.6
10
20
30
40
4266 F14
50
0.8
1.0
0.1
0.3
0.5
0.7
0.9
60
802.3af FOLDBACK
2 x
802.3af
FOLDBACK
SOA
75ms
AT
25°C
SOA DC AT 90°C
PD Voltage (V) at VPSE = 58V
0
0.0
PSE
Current
(A)
0.2
0.4
0.6
10
20
30
40
4266 F15
50
0.8
1.0
0.1
0.3
0.5
0.7
0.9
60
LTC4266
FOLDBACK
802.3af FOLDBACK
SOA DC AT 90°C
SOA
75ms
AT
90°C
SOA
75ms
AT
25°C
Figure14.TurnOnCurrentsvsFETSafeOperating
Areaat90°CAmbient
Figure15.LTC4266FoldbackvsFETSafeOperating
Areaat90°CAmbient
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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:- 標準包裝: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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