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參數(shù)資料
| 型號： | LTC4257IS8#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 網(wǎng)絡(luò)接口 |
| 英文描述： | IEEE 802.3af PD Power over Ethernet Interface Controller; Package: SO; No of Pins: 8; Temperature Range: -40°C to +85°C |
| 中文描述： | DATACOM, NETWORK INTERFACE SUPPORT CIRCUIT, PDSO8 |
| 封裝： | 0.150 INCH, LEAD FREE, PLASTIC, SOP-8 |
| 文件頁數(shù)： | 16/20頁 |
| 文件大?。?/td> | 258K |
| 代理商： | LTC4257IS8#PBF |
LTC4257
5
4257fb
NC (Pin 1): No Connect.
RCLASS (Pin 2): External Class Select Input. Used to set the
current the LTC4257 maintains during classification. Con-
nect a resistor between RCLASS and VIN (see Table 2).
NC (Pin 3): No Connect.
VIN (Pin 4): Power Input. Tie to system – 48V through the
input diode bridge.
VOUT (Pin 5): Power Output. Supplies –48V to the PD load
through an internal power MOSFET that limits input cur-
rent. VOUT is high impedance until the input voltage rises
above the turn-on UVLO threshold. Above the UVLO
threshold the output is current limited to 350mA.
PWRGD (Pin 6): Power Good Output, Open-Drain. Signals
that the LTC4257 MOSFET is fully on. Low impedance
indicates power is good. PWRGD is high impedance
during detection, classification and in the event of a
thermal overload. PWRGD is referenced to VIN.
NC (Pin 7): No Connect
GND (Pin 8): Ground. Tie to system ground and to power
return through the input diode bridge.
UU
U
PI FU CTIO S
BLOCK DIAGRA
W
4257 BD
VIN
BOLD LINE INDICATES HIGH CURRENT PATH
VOUT
–
+
8
5
4
NC 3
RCLASS 2
NC
PWRGD
GND
7
NC
1
6
CONTROL
CIRCUITS
INPUT
CURRENT
LIMIT
350mA
POWER GOOD
CLASSIFICATION
CURRENT SOURCE
1.237V
EN
0.3
–
+
EN
25k SIGNATURE
RESISTOR
相關(guān)PDF資料 |
PDF描述 |
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| LTC4257IS8#TRPBF | IEEE 802.3af PD Power over Ethernet Interface Controller; Package: SO; No of Pins: 8; Temperature Range: -40°C to +85°C |
| LTC4259ACGW-1#PBF | Quad IEEE 802.3af Power over Ethernet Controller with AC Disconnect; Package: SSOP; No of Pins: 36; Temperature Range: 0°C to +70°C |
| LTC4259ACGW-1#TRPBF | Quad IEEE 802.3af Power over Ethernet Controller with AC Disconnect; Package: SSOP; No of Pins: 36; Temperature Range: 0°C to +70°C |
| LTC4259AIGW-1#PBF | Quad IEEE 802.3af Power over Ethernet Controller with AC Disconnect; Package: SSOP; No of Pins: 36; Temperature Range: -40°C to +85°C |
| LTC4259AIGW-1#TRPBF | Quad IEEE 802.3af Power over Ethernet Controller with AC Disconnect; Package: SSOP; No of Pins: 36; Temperature Range: -40°C to +85°C |
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: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: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(yīng)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 |
| LTC4258CGW#TR | 制造商:Linear Technology 功能描述:POWER OVER ETHERNET CONTROLLER |
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