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

概述

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

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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

参数规格

Part Number

Compliance

R_DS(ON)
(Ω)

PWM

UVLO Threshold
(V)

Package/Pins

Oper. Temp.
(°C)

Budgetary
Price

PD MOSFET

See Notes

MAX5995B

IEEE 802.3af

IEEE 802.3at

IEEE 802.3bt

0.1

35.4

TQFN/16

-40 to +85

$2.60 @1k

查看所有Powered Devices (31)

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。

设计资源

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

质量与环境

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 >
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