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LTC4274 PDF预览

LTC4274

更新时间： 2024-01-28 23:55:15
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
2页 113K
描述
Single IEEE 802.3at Power Over Ethernet Controller

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中文翻译

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LTC4274 技术参数

是否Rohs认证： 符合生命周期：Transferred
零件包装代码：QFN包装说明：HVQCCN,
针数：38Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：8.34模拟集成电路 - 其他类型：ANALOG CIRCUIT
JESD-30 代码：R-PQCC-N38JESD-609代码：e3
长度：7 mm湿度敏感等级：1
功能数量：1端子数量：38
最高工作温度：85 °C最低工作温度：-40 °C
封装主体材料：PLASTIC/EPOXY封装代码：HVQCCN
封装形状：RECTANGULAR封装形式：CHIP CARRIER, HEAT SINK/SLUG, 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最大供电电压 (Vsup)：4.3 V
最小供电电压 (Vsup)：3 V标称供电电压 (Vsup)：3.3 V
表面贴装：YES技术：CMOS
温度等级：INDUSTRIAL端子面层：Matte Tin (Sn)
端子形式：NO LEAD端子节距：0.5 mm
端子位置：QUAD处于峰值回流温度下的最长时间：NOT SPECIFIED
宽度：5 mmBase Number Matches：1

LTC4274 数据手册

 浏览型号LTC4274的Datasheet PDF文件第2页 
LTC4274  
Single IEEE 802.3at Power Over Ethernet Controller  
FEATURES  
DESCRIPTION  
Compliant with IEEE 802.3at Type 1 and 2  
The LTC®4274 is a single Power Sourcing Equipment (PSE)  
controller designed for use in IEEE 802.3 Type 1 and Type 2  
(high power) compliant Power over Ethernet (PoE) systems.  
■
■
Supports Proprietary Very High Power Up to 50W  
■
0.34Ω Total Channel Resistance  
130mW at 600mA  
The LTC4274 is also a good choice for proprietary PoE PSE  
systems, which may require more power than the new IEEE  
802.3at standard allows. The LTC4274 can source up to 50W  
while otherwise remaining compatible with IEEE 802.3at.  
■
Advanced Power Management  
8-Bit Programmable Current Limit (ILIM  
)
7-Bit Programmable Overload Currents (ICUT  
Fast Shutdown  
14.5-Bit Port Current/Voltage Monitoring  
)
The LTC4274 delivers lowest-in-industry heat dissipation by  
utilizing a low RON external MOSFET and a 0.25Ω sense resis-  
tor, eliminating the need for expensive heat sinks. An external  
MOSFET also provides a more robust solution compared to  
an integrated MOSFET.  
2-Event Classification  
■
Very High Reliability 4-Point PD Detection:  
2-Point Forced Voltage  
2-Point Forced Current  
Advancedpowermanagementfeaturesinclude:selectablehigh  
speed 9.5-bit (1kHz) or high resolution 14.5-bit current and  
voltage readback, a 7-bit DAC for overcurrent threshold (ICUT),  
a unique nonlinear 8-bit programmable current limit (ILIM) and  
versatilequickshutdown.PDDiscoveryusesaproprietarydual-  
mode4-pointdetectionmechanismensuringthebestimmunity  
from false PD detection. Midspan PSEs are supported with  
2-event classification and a two second backoff timer. Legacy  
high-capacitance device detection is available. The LTC4274  
includes an I2C serial interface operable up to 1MHz.  
■
■
■
■
■
High Capacitance Legacy Device Detection  
LTC4259A-1 and LTC4266 SW Compatible  
1MHz I2C Compatible Serial Control Interface  
Midspan Backoff Timer  
Available in 38-Pin 5mm × 7mm QFN Package  
APPLICATIONS  
■
PoE PSE Switches/Routers  
PoE PSE Midspans  
■
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear  
Technology Corporation. All other trademarks are the property of their respective owners.  
TYPICAL APPLICATION  
Complete Ethernet High Power Source  
3.3V 0.1μF  
SCL  
INT  
SHDN  
V
DD  
SDAIN  
SDAOUT  
AD0  
AUTO  
MSD  
LTC4274  
RESET  
MID  
AD1  
AD2  
AD3  
DGND AGND  
V
SENSE GATE OUT  
EE  
0.22μF  
100V  
1μF  
100V  
S1B  
S1B  
SMAJ58A  
–54V  
PORT  
4274 TA01  
–54V  
pb4274f  
1
12

中文翻译

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