MAX5945

四路网络电源控制器,用于LAN供电


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说明

MAX5945四路网络电源控制器设计用于与IEEE® 802.3af兼容的供电设备(PSE)。器件提供用电设备(PD)探测、分级、限流以及直流和交流负载断开探测。MAX5945可用于终端PSE (LAN交换机/路由器)或中跨PSE (电源注入)系统。

MAX5945可独立工作,也可以由软件通过I²C兼容的接口进行控制。单独的输入和输出数据线(SDAIN和SDAOUT)允许使用光耦合器。MAX5945为从机器件,其四个地址输入可提供16个独立的MAX5945地址。/INT输出和四个关断输入(/SHD_)允许从出现错误到端口关断的快速响应。/RESET输入允许硬件复位器件。软件崩溃时,特殊的看门狗功能使硬件能够顺利实现状态过渡。顺序定时功能使MAX5945非常适合中跨系统。

MAX5945完全由软件配置和编程。分级过流检测使系统电源管理能够检测PD吸收的电流是否大于其分级所允许的电流。其它功能包括:输入欠压/过压锁定、过热保护、启动期间的输出电压摆率限制、电源就绪以及故障状态输出。MAX5945的可编程功能包括:栅极充电电流、限流门限、启动超时、过流超时、自动重启占空比、PD断开交流检测门限以及PD断开检测超时。

MAX5945采用36引脚SSOP封装,工作于扩展工业级(-40°C至+85°C)和商业级(0°C至+70°C)温度范围。
MAX5945:典型工作电路 MAX5945:典型工作电路 放大+

关键特性

  • 符合IEEE 802.3af标准
  • 在端点或中跨PSE应用中控制四个独立的-48V以太网端口
  • VDIG宽数字电源输入,共模范围:VEE至(AGND + 7.7V)
  • PD分级电流保护
  • PD探测和分类
  • 同时提供DC和AC负载断开检测
  • I²C兼容3线串行接口
  • 通过I²C接口进行编程、配置
  • 折返式电流限制及占空比控制/可编程电流限制
  • 带快速门极下拉的短路保护
  • 快速关断控制
  • 可编程直接中断输出
  • 看门狗模式允许硬件电路顺利实现状态过渡

应用

  • 中跨电源注入
  • LAN供电/以太网供电
  • 供电设备(PSE)
  • 交换机/路由器

MAX5945EVKIT: MAX5945评估板/评估系统
MAX5945EVSYS: MAX5945评估板/评估系统
产品可靠性报告: MAX5945.pdf 
型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C   Material Composition  

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。

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