MAX5971B

单端口、40W、IEEE 802.3af/at PSE控制器,带有I²C接口

40W、I²C、单端口、IEEE 802.3af/at兼容PSE控制器,集成0.5Ω功率MOSFET和检流电阻


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说明

MAX5971B是一个单端口电源控制器,设计用于IEEE® 802.3af/at兼容供电设备(PSE)。器件提供用电设备(PD)侦测、分级、限流以及直流和交流负载断开检测。MAX5971B支持自动工作和软件编程,它集成了功率MOSFET和检流电阻。器件采用54V单电源供电,支持检测和分级。此外,还支持2级事件分级和最新的大功率PD的5级分级。MAX5971B能够为单个端口提供高达40W的功率(使能5级),并为传统的PD设计提供大电容检测。

器件具有四种工作模式,适用于不同系统的要求。默认条件下的自动模式允许器件以默认设置自动运行,无需软件进行任何设置。半自动模式下,在经过软件初始化后对连接到端口的器件进行自动检测和分级,但在软件发出指令之前不会给端口供电。手动模式允许软件全程控制,有助于进行系统诊断。关断模式下将终止所有端口操作,安全关闭所有端口电源。

IC通过I²C兼容的2线串口进行软件配置和编程。器件通过I²C接口随时提供端口的电流读数。全面的可编程能力提高了系统灵活性,并提供现场诊断功能,满足各种非标准系统应用。

器件提供输入欠压锁定(UVLO)、输入欠压检测、输入过压锁定、过热保护、开启过程的输出电压摆率限制和LED状态指示。MAX5971B的可编程功能包括:启动超时、过流超时以及负载断开检测超时。

器件采用节省空间的28引脚TQFN (5mm x 5mm)功率封装,工作在扩展级(-40°C至+85°C)温度范围。
MAX5971B:典型工作电路 MAX5971B:典型工作电路 放大+

关键特性

  • 符合IEEE 802.3af/at标准
  • PSE应用中,每个端口可提供高达40W功率
  • 集成功率MOSFET和检流电阻
  • 支持54V单电源工作
  • PD检测和分级
  • I²C兼容2线串口
  • 通过I²C接口随时读取端口电流的读数
  • 对5级PD提供可编程限流
  • 为早期设备提供大电容侦测
  • 支持直流和交流负载移除检测
  • 折返式限流以及占空比受控的电流限制
  • 端口状态LED指示
  • 可直接、快速地关断器件
  • 节省空间的28引脚TQFN (5mm x 5mm)功率封装

应用

  • 单端口PSE端点应用
  • 单端口PSE电源(中跨系统)
  • 交换机/路由器
Part NumberComplianceHigh Power ModeChannelsPort Current ReadoutLoad DisconnectProgram-
mability
Package/PinsOper. Temp.
(°C)
Budgetary
Price
See Notes
MAX5971B 
IEEE 802.3af
IEEE 802.3at
Yes1I2CAC/DCI2C
TQFN/28
-40 to +85$4.31 @1k
查看所有Power Sourcing Equipment (8)
Pricing Notes:
价格仅供参考,用于同类产品的比较。所提供报价为美元,需要依汇率折合成人民币。该价格将因当地关税、税率和汇率而异。有关特定订购量和指定版本的报价和供货问题,请参考:价格与供货网站或与指定代理商联系。


MAX5971BEVKIT: MAX5971B评估板

技术资料

应用笔记 6161 25.5W-80W Class 5 Single Port PoE Power Injector

质量和环境数据

申请可靠性报告: MAX5971B 
无铅封装的锡(Sn)晶须报告

CAD Symbols and Footprints

  • MAX5971BETI+
  • MAX5971BETI+T
  • MAX5971BETI+TW
  • MAX5971BETI+W
  • 型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C  

    备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

    质量管理体系 >
    环境管理体系 >

     
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    类型 编号 PDF 标题
    应用笔记 6161 25.5W-80W Class 5 Single Port PoE Power Injector
    类型 编号 标题
    评估板7337MAX5971BEVKIT MAX5971B评估板