參數(shù)資料
型號: LTC4257CS8
廠商: Linear Technology
文件頁數(shù): 17/20頁
文件大?。?/td> 263K
描述: IC CTRLR INTFACE PWR/ETHER 8SOIC
標準包裝: 100
類型: 以太網(wǎng)供電開關(guān)(PoE)
應(yīng)用: IP 電話,LAN 網(wǎng)絡(luò)供電,網(wǎng)絡(luò)路由器和交換機
內(nèi)部開關(guān):
電流限制: 350mA
工作溫度: 0°C ~ 70°C
安裝類型: 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: 管件
產(chǎn)品目錄頁面: 1338 (CN2011-ZH PDF)
LTC4257
17
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APPLICATIO S I FOR ATIO
U
U
U
Layout
The LTC4257 is relativity immune to layout problems.
Excessive parasitic capacitance on the R
CLASS
 pin should
be avoided. If using the DD package, include an electrically
isolated heat sink to which the exposed pad on the bottom
of the package can be soldered. For optimal thermal
performance, make the heat sink as large as possible.
Voltages in a PD can be as large as 57V, so high voltage
layout techniques should be employed.
The load capacitor connected between Pins 5 and 8 of the
LTC4257 can store significant energy when fully charged.
The design of a PD must ensure that this energy is not
inadvertently dissipated in the LTC4257. The polarity-
protection diode(s) prevent an accidental short on the
cable from causing damage. However, if the V
IN
 pin is
shorted to the GND pin inside the PD while the load
capacitor is charged, current will flow through the para-
sitic body diode of the internal MOSFET and may cause
permanent damage to the LTC4257.
Input Surge Suppression
The LTC4257 is specified to operate with an absolute
maximum voltage of 100V and is designed to tolerate
brief overvoltage events. However, the pins that interface
to the outside world (primarily V
IN
 and GND) can routinely
see peak voltages in excess of 10kV. To protect the
LTC4257, it is highly recommended that a transient volt-
age suppressor be installed between the bridge and the
LTC4257 (D3 in Figure 2).
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LTC4257CS8-#1TRPBF 制造商:LINEAR_TECH 功能描述:
LTC4257CS8#PBF 功能描述:IC CTRLR INTFACE PWR/ETHER 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標準包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠程電力系統(tǒng),AdvancedTCA ? 系統(tǒng),高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP,10-MSOP(0.118",3.00mm 寬) 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件
LTC4257CS8#TR 功能描述:IC CTRLR INTFACE PWR/ETHER 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標準包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠程電力系統(tǒng),AdvancedTCA ? 系統(tǒng),高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP,10-MSOP(0.118",3.00mm 寬) 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件
LTC4257CS8#TRPBF 功能描述:IC CTRLR INTFACE PWR/ETHER 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標準包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠程電力系統(tǒng),AdvancedTCA ? 系統(tǒng),高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP,10-MSOP(0.118",3.00mm 寬) 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件
LTC4257CS81 制造商:Linear Technology 功能描述: