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LTC4257CDD#PBF PDF预览

LTC4257CDD#PBF

更新时间： 2024-11-21 20:10:59
品牌 Logo 应用领域
凌特 - Linear 电信光电二极管电信集成电路
页数 文件大小 规格书
20页 245K
描述
LTC4257 - IEEE 802.3af PD Power over Ethernet Interface Controller; Package: DFN; Pins: 8; Temperature Range: 0°C to 70°C

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中文翻译

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LTC4257CDD#PBF 技术参数

是否Rohs认证： 符合生命周期：Transferred
零件包装代码：DFN包装说明：VSON,
针数：8Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：7.89JESD-30 代码：S-PDSO-N8
JESD-609代码：e3长度：3 mm
湿度敏感等级：1功能数量：1
端子数量：8最高工作温度：70 °C
最低工作温度：封装主体材料：PLASTIC/EPOXY
封装代码：VSON封装形状：SQUARE
封装形式：SMALL OUTLINE, VERY THIN PROFILE峰值回流温度（摄氏度）：260
认证状态：Not Qualified座面最大高度：0.8 mm
表面贴装：YES电信集成电路类型：SUPPORT CIRCUIT
温度等级：COMMERCIAL端子面层：Matte Tin (Sn)
端子形式：NO LEAD端子节距：0.5 mm
端子位置：DUAL处于峰值回流温度下的最长时间：30
宽度：3 mmBase Number Matches：1

LTC4257CDD#PBF 数据手册

 浏览型号LTC4257CDD#PBF的Datasheet PDF文件第2页浏览型号LTC4257CDD#PBF的Datasheet PDF文件第3页浏览型号LTC4257CDD#PBF的Datasheet PDF文件第4页浏览型号LTC4257CDD#PBF的Datasheet PDF文件第5页浏览型号LTC4257CDD#PBF的Datasheet PDF文件第6页浏览型号LTC4257CDD#PBF的Datasheet PDF文件第7页 
LTC4257  
IEEE 802.3af PD  
Power over Ethernet  
Interface Controller  
U
FEATURES  
DESCRIPTIO  
Complete Power Interface Port for IEEE 802.3af®  
The LTC®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  
the25ksignatureresistor,theclassificationcurrentsource,  
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.  
■
Powered Devices (PDs)  
■
Onboard 100V, 400mA Power MOSFET  
■
Precision Input Current Limit  
Onboard 25k Signature Resistor  
■
■
Programmable Classification Current (Class 0-4)  
■
Undervoltage Lockout  
■
Smart Thermal Protection  
■
Power Good Signal  
■
Available in 8-Pin SO and Low Profile (3mm × 3mm)  
DFN Packages  
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.  
U
APPLICATIO S  
■
IP Phone Power Management  
■
Wireless Access Points  
■
Telecom Power Control  
The LTC4257 is available in the 8-pin SO and low profile  
(3mm × 3mm) DFN packages.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
U
TYPICAL APPLICATIO  
LTC4257 Charging 300µF  
Load Capacitor  
Powered Device (PD)  
V
IN  
50V/DIV  
LTC4257  
V
OUT  
V
IN  
GND  
SMAJ58A  
~
+
–
20V/DIV  
–48V FROM  
POWER SOURCING  
EQUIPMENT  
(PSE)  
+
SWITCHING  
POWER SUPPLY  
5µF  
MIN  
R
V
CLASS  
100k  
0.1µF  
DF01SA  
+
I
IN  
PWRGD  
SHDN  
RTN  
3.3V  
~
R
CLASS  
200mA/DIV  
TO LOGIC  
V
–
IN  
OUT  
4257 TA01  
PWRGD  
50V/DIV  
5ms/DIV  
4225 TA02  
4257fb  
1
1234567...20

中文翻译

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