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Home » NEWEST Products » New by Manufacturer » Maxim Integrated » MAX5981A / MAX5981B PD Interface Controllers - Maxim Integrated
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Maxim MAX5981A / MAX5981B PD Interface Controllers

Maxim Integrated MAX5981A / MAX5981B
PD Interface Controllers

Maxim Integrated MAX5981A / MAX5981B IEEE® 802.3af/at-Compliant, Powered Device (PD) Interface Controllers with Integrated Power MOSFET provide a complete interface for a PD to comply with the IEEE 802.3af/at standard in a power-over-ethernet (PoE) system. Maxim Integrated MAX5981 PD Interface Controllers provide the PD with a detection signature, a classification signature, and an integrated isolation power switch with inrush current control. 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). This Maxim Integrated device detects the presence of a wall adapter power source connection and allows a smooth switch over from the PoE power source to the wall power adapter. Sleep mode and ultra-low power sleep mode features provide low power consumption while supporting Maintain Power Signature (MPS). MAX5891 PD Interface Controllers also feature an LED driver that is automatically activated during sleep mode. During sleep mode, the LED driver sources a periodic current (ILED) at 250Hz (MAX5981A) or 15.625kHz (MAX5981B).

Features
  • Sleep Mode and Ultra-Low Power
  • IEEE 802.3af/at Compliant
  • 2-Event Classification or an External Wall Adapter Indicator Output
  • Simplified Wall Adapter Interface
  • PoE Classification 0-5
  • 100V Input Absolute Maximum Rating
  • Inrush Current Limit of 180mA Maximum
  • Current Limit During Normal Operation Between 720mA and 880mA
  • Current Limit and Foldback
  • Legacy UVLO at 36V
  • LED Driver with Programmable LED Current
  • Overtemperature Protection
  • Thermally Enhanced, 5mm x 5mm, 16-Pin TQFN
Applications
  • IEEE 802.3af/at Powered Devices
  • IP Phones, Wireless Access Nodes, IP Security
  • Cameras
  • WiMAX™ Base Stations

Block Diagram

Block Diagram
  • Maxim Integrated
  • Power Management
  • Semiconductors|Integrated Circuits|IC-Power Management|IC-Switch