Maxim Introduces MAX5971B, Highly Integrated IEEE 802.3af/at-Compliant PSE Controller

The is a single-port power-sourcing equipment (PSE) controller for IEEE® 802.3af/at-compliant, high-power power-over-Ethernet (PoE+) applications. This device integrates a 0.5 ohm power MOSFET, sense resistor, and current monitor to save space and cost in PSE systems—the typical application circuit requires fewer than eight external components. Additionally, the MAX5971B includes a 9-bit ADC and I²C interface to enable advanced power management and power budgeting. Capable of delivering up to 40W/port for PoE+ powered devices (PDs), the MAX5971B is well suited for IP phones, IP cameras, wireless LAN access points, and video surveillance cameras.

MAX5971B PSE Controller
(Photo from Maxim Website)

This MAX5971B PSE controller is fully compliant to the IEEE 802.3af and IEEE 802.3at standards. The device operates from 32V to 60V and provides IEEE 802.3af/at-compliant PD discovery, classification, and DC/AC load-disconnect detection. Class 5 and two-event classification are supported for detection and classification of high-power PDs. The MAX5971B also detects legacy (noncompliant) PDs that use high capacitance as the discovery signature.

More information about Power-Sourcing Equipment Controller can be found at Maxim Website