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LTC4257CDD-1 PDF预览

LTC4257CDD-1

更新时间： 2024-09-16 22:51:47
品牌 Logo 应用领域
凌特 - Linear 控制器以太网
页数 文件大小 规格书
20页 268K
描述
Power over Ethernet Interface Controller with Dual Current Limit

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中文翻译

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LTC4257CDD-1 技术参数

是否Rohs认证： 不符合生命周期：Transferred
零件包装代码：DFN包装说明：VSON, SOLCC8,.11,20
针数：8Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.11其他特性：REQUIRES A NEGATIVE SUPPLY OF 48V
可调阈值：NO模拟集成电路 - 其他类型：POWER SUPPLY SUPPORT CIRCUIT
JESD-30 代码：S-PDSO-N8JESD-609代码：e0
长度：3 mm湿度敏感等级：1
信道数量：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封装等效代码：SOLCC8,.11,20
封装形状：SQUARE封装形式：SMALL OUTLINE, VERY THIN PROFILE
峰值回流温度（摄氏度）：235认证状态：Not Qualified
座面最大高度：0.8 mm子类别：Power Management Circuits
最大供电电流 (Isup)：3 mA表面贴装：YES
技术：CMOS温度等级：COMMERCIAL
端子面层：Tin/Lead (Sn/Pb)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：20宽度：3 mm
Base Number Matches：1

LTC4257CDD-1 数据手册

 浏览型号LTC4257CDD-1的Datasheet PDF文件第2页浏览型号LTC4257CDD-1的Datasheet PDF文件第3页浏览型号LTC4257CDD-1的Datasheet PDF文件第4页浏览型号LTC4257CDD-1的Datasheet PDF文件第5页浏览型号LTC4257CDD-1的Datasheet PDF文件第6页浏览型号LTC4257CDD-1的Datasheet PDF文件第7页 
LTC4257-1  
IEEE 802.3af PD  
Power over Ethernet Interface  
Controller with Dual Current Limit  
U
FEATURES  
DESCRIPTIO  
Complete Power Interface Port for IEEE 802®.3af  
Powered Devices (PDs)  
The LTC®4257-1 provides complete signature and power  
interface functions for a device operating in an IEEE  
802.3afPoweroverEthernet(PoE)system.TheLTC4257-1  
simplifies Powered Device (PD) design by incorporating  
the 25k signature resistor, classification current source,  
input current limit, undervoltage lockout, thermal over-  
load protection, signature disable and power good signal-  
ling, all in a single 8-pin package. The LTC4257-1 includes  
a precision, dual level current limit circuit. This allows it to  
charge large load capacitors and interface with legacy  
Power over Ethernet systems while maintaining compat-  
ibility with the current IEEE 802.3af specification. By  
incorporating a high voltage power MOSFET onboard, the  
LTC4257-1 provides the system designer with reduced  
cost while also saving board space.  
■
■
■
■
■
■
■
■
■
Onboard 100V, 400mA Power MOSFET  
Precision Dual Level Current Limit  
Onboard 25k Signature Resistor with Disable  
Programmable Classification Current (Class 0-4)  
Undervoltage Lockout  
Thermal Overload Protection  
Power Good Signal  
Available in 8-Pin SO and Low Profile (3mm × 3mm)  
DFN Packages  
U
APPLICATIO S  
■
IP Phone Power Management  
■
Wireless Access Points  
The LTC4257-1 can interface directly with a variety of Lin-  
earTechnologyDC/DCconverterproductstoprovideacost  
effective power solution for IP phones, wireless access  
points and other PDs. Linear Technology also provides  
networkpowercontrollersforPowerSourcingEquipment  
(PSE) applications.  
■
Telecom Power Control  
The LTC4257-1 is available in the 8-pin SO and low profile  
(3mm × 3mm) DFN packages.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
802 is a registered trademark of Institute of Electrical and Electronics Engineers, Inc.  
U
TYPICAL APPLICATIO  
Powered Device (PD)  
LTC4257-1  
GND  
+
5µF  
V
IN  
~
+
–
SMAJ58A  
MIN  
–48V FROM  
POWER SOURCING  
EQUIPMENT  
(PSE)  
SWITCHING  
POWER SUPPLY  
R
V
SIGDISA  
PWRGD  
0.1µF  
DF01SA  
CLASS  
100k  
+
SHDN  
RTN  
~
3.3V  
R
CLASS  
TO LOGIC  
V
–
IN  
OUT  
42571 TA01  
42571fa  
1
1234567...20

中文翻译

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