MAX5971CETI+T

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PMIC (Power Management Integrated Circuit) is a type of integrated circuit designed for managing and controlling power for electronic systems. Power Over Ethernet (PoE) controllers are specialized forms of PMIC designed for use with Ethernet cables to power communication equipment. The MAX5971CETI+T Power Management Integrated Circuit (PMIC) is an example of such a power over Ethernet (PoE) controller. This PMIC is designed to control power with an Ethernet cable and is ideally suited for communications equipment applications including 802.3af compliant devices.

Overview
The MAX5971CETI+T is a single-chip PoE PSE (power sourcing equipment) enabling dual supply PD (powered device) applications, terminal adapters, and PD systems needing two isolated power supplies. The device\'s unique design helps reduce the best-in-class BOM to a few external components. A variety of over-voltage, over-temperature, and fault protection features help protect the electronics against damages and improve reliability. This single-chip solution, combined with MAX5971\'s integrated IEEE802.3af compliant PSE controller, provides compact size and easy systems integration.

Power Delivery Features
The MAX5971CETI+T supports up to two isolated power outputs, each capable of supplying 25.5 W to the load. The device is optimized to provide Class 3 power with minimum losses and no external components required. It is capable of delivering transient protection up to ±29V. The device offers programmability of both the maximum power levels and Class 0 9W power delivery levels, give the system designer valuable flexibility and scalability. Additionally, the device features the ability to power-down PDs automatically, allowing for more secure fault management.

Maximum Power and Class 0 Features
The MAX5971CETI+T device includes two integrated 25V N-channel MOSFETs to support a maximum power level of 25.5 W with a low−loss, no−component solution. The device supports the maximum power level up to 25.5 W combined with 14.5 W Class 0 power delivery. This level of programmability helps the system designer to optimize both cost and performance in PoE applications.

Integrated IEEE 802.3af Controller
The MAX5971CETI+T includes an integrated IEEE802.3af compliant PSE controller and circuitry which implements the BEMF (Back EMF) sensing and PSE power cut off functions. The device offers a unique monitoring mechanism to detect the PSE and PD current, as well as an integrated comparator, to detect overcurrent conditions.

• Cables and connectors
• Data networks
• Home Electronics
• IP Phones
• Set-Top Boxes
• Surveillance & Security
• Video & Audio
• VoIP
• Wireless Communications

Working Principle
The MAX5971CETI+T is an integrated Power Over Ethernet (PoE) controller designed to control power with an Ethernet cable. It works by using a built-in IEEE802.3af compliant PSE controller, which can detect if PoE is enabled on the system and enable power to the PDs. The device features two integrated 25V N-channel MOSFETs to support a maximum power level of 25.5 W with a low−loss, no−component solution. It is optimized to provide Class 3 power with minimum losses and no external components required. The device also offers the ability to power-down PDs automatically, allowing for more secure fault management. In addition, the MAX5971CETI+T device includes integrated transient protection up to ±29V.

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