MAX5995A

IEEE 802.3bt兼容、用电设备接口控制器,集成91W高功率MOSFET

IEEE 802.3af/at/bt兼容;将PD供电功率翻倍,可支持1级至4级PSE和多次事件分级


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说明

MAX5995A/MAX5995B/MAX5995C提供完备的用电设备(PD)接口,使以太网供电(PoE)系统符合IEEE® 802.3af/at/bt标准。器件为PD提供侦测签名、分级签名和集成隔离电源开关,带有启动浪涌电流控制。启动期间,器件将电流限制到135mA (典型值),然后在隔离电源MOSFET完全增强后再切换到较高限流值(1800mA至2400mA,典型值)。器件具有多次事件分级、智能MPS (MAX5995B/MAX5995C)、自动分级(MAX5995C)、具有宽滞回和长抗尖峰时间的UVLO,以补偿双绞线电缆的阻性压降,以及确保上电/断电条件期间的无干扰转换。器件的输入可承受最大100V电压。

器件支持多次事件分级方法,符合IEEE 802.3bt标准的规定,提供指示1级至4级供电设备(PSE)的信号。器件可检测墙上适配器电源连接,允许从PoE电源平稳切换到墙上电源适配器。

器件也提供电源就绪(PG)信号、两级限流和折返限流控制、过热保护。MAX5995A/MAX5995B的休眠模式能最大程度降低功耗,同时产生维持功率特征(MPS),以保持PSE连接。MAX5995A/MAX5995B的超低功耗休眠模式进一步降低功耗,同时仍然产生MPS电流。MAX5995B/MAX5995C提供智能维持功率特征(IMPS)功能,通过检测端口电流自动使能MPS电流。器件具有LED驱动器,在休眠模式、超低功耗休眠模式(MAX5995A/MAX5995B)以及智能MPS模式(MAX5995B/MAX5995C)期间激活。多次事件指示特性提供模式信号,指示5种不同场景下从PSE分配给PD的功率水平。MAX5995C提供自动分级特性,支持高级应用,允许PSE有效优化分配给PD的功率。

MAX5995A/MAX5995B/MAX5995C采用16引脚、5mm x 5mm、TQFN封装。器件工作在-40ºC至+85ºC温度范围。

MAX5995A, MAX5995B, MAX5995C: Simplified Block Diagram MAX5995A, MAX5995B, MAX5995C: Simplified Block Diagram 放大+

关键特性

  • 兼容IEEE 802.3af/at/bt
  • 1至4级PSE分级指示或外部墙上适配器指示输出
  • 简化的墙上适配器接口
  • 0-8多次事件分级
  • 智能MPS (MAX5995B/MAX5995C,专利号US9152161)
  • 休眠模式和超低功耗休眠模式(MAX5995A/MAX5995B)
  • 100V输入绝对最大额定值
  • 启动期间浪涌限流
  • 常规工作期间电流限值
  • 折返式限流保护
  • 欠压锁定 @ 36V
  • LED驱动器,可编程LED电流(MAX5995A/MAX5995B)
  • 过热保护
  • 多次事件电源水平指示
  • 自动分级特性(MAX5995C)
  • 热增强、5mm x 5mm、16引脚TQFN封装

应用

  • 楼宇自动化
  • IEEE 802.3bt用电设备
  • 照明
  • 小蜂窝、微微蜂窝
  • VoIP电压、IP安全摄像机
  • 无线接入点
Part NumberComplianceRDS(ON)
(Ω)
PWMUVLO Threshold
(V)
Package/PinsOper. Temp.
(°C)
Budgetary
Price
PD MOSFETSee Notes
MAX5995B 
IEEE 802.3af
IEEE 802.3at
IEEE 802.3bt
0.1No35.4
TQFN/16
-40 to +85$2.60 @1k
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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。


MAX5995BEVKIT: MAX5995A, MAX5995B, MAX5995C, MAX5974D评估套件

质量和环境数据

申请可靠性报告: MAX5995A 
无铅封装的锡(Sn)晶须报告
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。

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