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参数资料
| 型号： | LTC4257IS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/20页 |
| 文件大小： | 263K |
| 描述： | IC CTRLR INTFACE PWR/ETHER 8SOIC |
| 产品培训模块： | Power over Ethernet |
| 标准包装： | 100 |
| 类型： | 以太网供电开关（PoE） |
| 应用： | IP 电话，LAN 网络供电，网络路由器和交换机 |
| 内部开关： | 是 |
| 电流限制： | 350mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
| 产品目录页面： | 1338 (CN2011-ZH PDF) |
LTC4257
5
4257fb
NC (Pin 1): No Connect.
R
CLASS
(Pin 2): External Class Select Input. Used to set the
current the LTC4257 maintains during classification. Con-
nect a resistor between R
CLASS
and V
IN
(see Table 2).
NC (Pin 3): No Connect.
V
IN
(Pin 4): Power Input. Tie to system 48V through the
input diode bridge.
V
OUT
(Pin 5): Power Output. Supplies 48V to the PD load
through an internal power MOSFET that limits input cur-
rent. V
OUT
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 V
IN
.
NC (Pin 7): No Connect
GND (Pin 8): Ground. Tie to system ground and to power
return through the input diode bridge.
U
U
PI FU CTIO S
BLOCK DIAGRA
4257 BD
V
IN
BOLD LINE INDICATES HIGH CURRENT PATH
V
OUT
+
8
5
4
NC
3
R
CLASS
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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4258 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Quad IEEE 802.3at Power over Ethernet Controller |
| LTC4258_09 | 制造商:LINER 制造商全称: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 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 |
| LTC4258CGW#TR | 制造商:Linear Technology 功能描述:POWER OVER ETHERNET CONTROLLER |
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