參數(shù)資料
型號(hào)： LTC4257IS8#TRPBF
廠(chǎng)商： Linear Technology
文件頁(yè)數(shù)： 1/20頁(yè)
文件大小： 263K
描述： IC CTRLR INTFACE PWR/ETHER 8SOIC
標(biāo)準(zhǔn)包裝： 2,500
類(lèi)型： 以太網(wǎng)供電開(kāi)關(guān)（PoE）
應(yīng)用： IP 電話(huà)，LAN 網(wǎng)絡(luò)供電，網(wǎng)絡(luò)路由器和交換機(jī)
內(nèi)部開(kāi)關(guān)： 是
電流限制： 350mA
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SOIC
包裝： 帶卷 (TR)
LTC4257
1
4257fb
The LTC
?/DIV>
4257 provides complete signature and power
interface functions for a device operating in an IEEE
802.3af Power over Ethernet (PoE) system. The LTC4257
simplifies Powered Device (PD) design by incorporating
the 25k signature resistor, the classification current source,
input current limit with thermal foldback, undervoltage
lockout and power good signalling, all in a single 8-pin
package. By incorporating a high voltage power MOSFET
onboard, the LTC4257 provides the system designer with
reduced cost while also saving board space.
The LTC4257 can interface directly with a variety of Linear
Technology DC/DC converter products to provide a cost
effective power solution for IP phones, wireless access
points and other PDs. Linear Technology also provides
solutions for Power Sourcing Equipment (PSE) applica-
tions with quad network power controllers.
The LTC4257 is available in the 8-pin SO and low profile
(3mm ?3mm) DFN packages.
?/DIV>
IP Phone Power Management
?/DIV>
Wireless Access Points
?/DIV>
Telecom Power Control
, LTC and LT are registered trademarks of Linear Technology Corporation.
?/DIV>
Complete Power Interface Port for IEEE 802.3af
?/DIV>
Powered Devices (PDs)
?/DIV>
Onboard 100V, 400mA Power MOSFET
?/DIV>
Precision Input Current Limit
?/DIV>
Onboard 25k Signature Resistor
?/DIV>
Programmable Classification Current (Class 0-4)
?/DIV>
Undervoltage Lockout
?/DIV>
Smart Thermal Protection
?/DIV>
Power Good Signal
?/DIV>
Available in 8-Pin SO and Low Profile (3mm ?3mm)
DFN Packages
IEEE 802.3af PD
Power over Ethernet
Interface Controller
GND
R
CLASS
R
CLASS
SMAJ58A
0.1礔
PWRGD
LTC4257
V
IN
SHDN
5礔
MIN
100k
3.3V
TO LOGIC
RTN
SWITCHING
POWER SUPPLY
V
IN
V
OUT
48V FROM
POWER SOURCING
EQUIPMENT
(PSE)
4257 TA01
+

+
DF01SA
~
~
+

Powered Device (PD)
5ms/DIV
V
IN
50V/DIV
V
OUT
20V/DIV
I
IN
200mA/DIV
PWRGD
50V/DIV
4225 TA02
LTC4257 Charging 300?/SPAN>F
Load Capacitor
FEATURES
DESCRIPTIO
APPLICATIO S
TYPICAL APPLICATIO
All other trademarks are the property of their respective owners.
相關(guān)PDF資料
PDF描述
UM-2NPAF2X2 BATTERY PK S-HD 6.0V C SIZE ZINC
LTC4257IS8#TR IC CONTROLLER POE INTERFAC 8SOIC
SDIN2B2-4G-Q IC INAND FLASH 4GB 169FBGA
GRM188R61A474MA61D CAP CER 0.47UF 10V 20% X5R 0603
LTC4252-2CMS8#TRPBF IC CNTRLR HOTSWAP NEGVOLT 8-MSOP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC4258 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Quad IEEE 802.3at Power over Ethernet Controller
LTC4258_09 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Quad IEEE 802.3af Power over Ethernet Controller with Integrated Detection
LTC4258CGW 制造商:Linear Technology 功能描述:POWER OVER ETHERNET CONTROLLER
LTC4258CGW#PBF 功能描述:IC POE 802.3AF QUAD 36-SSOP RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 控制器 系列:- 標(biāo)準(zhǔn)包裝:2,450 系列:- 控制器類(lèi)型:SPI 總線(xiàn)至 I²C 總線(xiàn)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(lèi)型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:24-HVQFN（4x4） 包裝:托盤(pán) 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名稱(chēng):935286452157SC18IS600IBSSC18IS600IBS-ND
LTC4258CGW#TR 制造商:Linear Technology 功能描述:POWER OVER ETHERNET CONTROLLER
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠(chǎng)商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*