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参数资料
| 型号： | LTC4266CIUHF#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： | 7 X 5 MM, LEAD FREE, PLASTIC, MO-220WHKD, QFN-38 |
| 文件页数： | 7/28页 |
| 文件大小： | 325K |
| 代理商： | LTC4266CIUHF#PBF |
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LTC4266A/LTC4266C
15
4266acf
operAtion
Figure 10. Power over Ethernet System Diagram
4266AC F10
S1B
SMAJ58A
0.22F
100V
X7R
1F
100V
X7R
Tx
Rx
Tx
SMAJ58A
58V
DATA PAIR
VEE SENSE GATE OUT
VDD
INT
SCL
SDAIN
SDAOUT
0.25
SPARE PAIR
1/4
LTC4266
DGND
AGND
I2C
3.3V
INTERRUPT
–48V
CAT 5
20 MAX
ROUNDTRIP
0.05F MAX
RJ45
4
5
4
5
1
2
1
2
3
6
3
6
7
8
7
8
RJ45
1N4002
×4
1N4002
×4
PSE
PD
RCLASS
–48VIN
PWRGD
–48VOUT
LTC4265
GND
DC/DC
CONVERTER
5F ≤ CIN
≤ 300F
+
–
VOUT
GND
0.1F
providesreliabledetectionandclassificationextensionsto
the existing IEEE PoE technique that are backward com-
patible and interoperable with existing Type 1 and Type 2
PDs. Unlike other proprietary PoE++ solutions, Linear’s
LTPoE++ solution provides mutual identification between
the PSE and PD. This ensures that the LTPoE++ PD knows
it may use the requested power at start-up because it has
detected a LTPoE++ PSE. LTPoE++ PSEs can differentiate
between a LTPoE++ PD and all other types of IEEE compli-
ant PDs allowing LTPoE++ PSEs to remain compliant and
interoperable with existing equipment.
LTC4266 Product Family
The LTC4266 is a third-generation quad PSE controller
that implements four PSE ports in either an end-point or
midspandesign.Virtuallyallnecessarycircuitryisincluded
to implement an IEEE 802.3at compliant PSE design,
requiring only an external power MOSFET and sense resis-
tor per channel; these minimize power loss compared to
alternative designs with on-board MOSFETs and increase
system reliability in the event a single channel fails.
The LTC4266 comes in three grades which support dif-
ferent PD power levels.
TheA-gradeLTC4266extendsPoEpowerdeliverycapabili-
ties to LTPoE++ levels. LTPoE++ is a Linear Technology
proprietary specification allowing for the delivery of up to
90WtoLTPoE++compliantPDs.TheLTPoE++architecture
extendstheIEEEphysicalpowernegotiationtoinclude35W,
45W, 70W and 90W power levels. The A-grade LTC4266
also incorporates all B- and C-grade features.
The B-grade LTC4266 is a fully IEEE-compliant Type 2
PSE supporting autonomous detection, classification
and powering of Type 1 and Type 2 PDs. The B-grade
LTC4266 also incorporates all C-grade features. The
B-grade LTC4266 is marketed and numbered without the
B suffix for legacy reasons; the absence of power grade
suffix infers a B-grade part.
TheC-gradeLTC4266isafullyautonomous802.3atType1
PSE solution. Intended for use only in AUTO pin mode,
the C-grade chipset autonomously supports detection,
classification and powering of Type 1 PDs. As a Type 1
PSE, 2-event classification is prohibited and Class 4 PDs
are automatically treated as Class 0 PDs.
PoE Basics
Common Ethernet data connections consist of two or four
twisted pairs of copper wire (commonly known as CAT-5
cable), transformer-coupled at each end to avoid ground
loops. PoE systems take advantage of this coupling ar-
rangement by applying voltage between the center-taps
of the data transformers to transmit power from the PSE
to the PD without affecting data transmission. Figure 10
shows a high-level PoE system schematic.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| 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 |
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