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MAX5981B Datasheet Powered Device Interface Controllers

Manufacturer: Maxim Integrated (now Analog Devices)

Overview: MAX5981A/MAX5981B 19-5732; Rev 2; 8/11 IEEE 802.3af/at-pliant, Powered Device Interface Controllers with Integrated Power MOSFET.

This datasheet includes multiple variants, all published together in a single manufacturer document.

General Description

The MAX5981 provides a ­plete interface for a powered device (PD) to ply with the IEEE® 802.3af/at standard in a power-over-ethernet (PoE) system.

The MAX5981 provides the PD with a detection signature, classifica­tion signature, and an integrated isolation power switch with inrush current control.

During the inrush period, the MAX5981 limits the current to less than 180mA before switching to the higher curr­ent limit (720mA to 880mA) when the isolation power MOSFET is fully enhanced.

Key Features

  • an input UVLO with wide hysteresis and long deglitch time to compensate for twisted-pair cable resistive drop and to assure glitch-free transition during power-on/-off condi­tions. The MAX5981 can with­stand up to 100V at the input. The MAX5981 supports a 2-Event classification method as specified in the IEEE 802.3at standard and provides a signal to indicate when probed by a Type 2 power sourcing equipment (PSE). The device detects the presence of a wall adapter power source connection and allo.

More Datasheets from Maxim Integrated (now Analog Devices)

Part Number Description
MAX5981A Powered Device Interface Controllers
MAX5980 IEEE 802.3at/af PSE Controller
MAX5982A Powered Device Interface Controllers
MAX5982B Powered Device Interface Controllers
MAX5982C Powered Device Interface Controllers
MAX5986A IEEE 802.3af-Compliant High-Efficiency PDs
MAX5986B IEEE 802.3af-Compliant High-Efficiency PDs
MAX5986C IEEE 802.3af-Compliant High-Efficiency PDs
MAX5987A IEEE 802.3af-Compliant High-Efficiency PDs
MAX5988A IEEE 802.3af-Compliant High-Efficiency Devices

MAX5981B Distributor