Features and Benefits

  • IEEE 802.3af/at-Compliant PD Interface Circuit
  • -39V to -57V Startup Input Voltage Range
  • Active FET Bridge
  • Demonstrates 2x2P PD and Multi-PD Redundancy Configurations
  • Demonstrates an Isolated 100W Active-Clamped, Synchronous-Rectified Forward DC-DC Converter
  • Isolated +12V Output at 8.4A
  • PD Detection and Configurable Classification Signatures
  • Internal UVLO at +38.6V
  • Evaluates End Span and Midspan Ethernet Systems
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Details

The MAX5992A/B evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board featuring the MAX5992A/B IEEE® 802.3af/at-compliant network powered device (PD) interface controller IC, which pro vides PD detection signature, PD classification signature, inrush current control, undervoltage lockout (UVLO), and active FET-bridge driver. The EV kit is a compact and low-cost design used in power-over-Ethernet (PoE) applications requiring DC power from an Ethernet network port for PDs, such as fiber-to-the-femotocell/ picocell/microcell, fiber-to-the-home/fiber-to-the-building (FTTH/FTTB), IP phones, wireless access nodes, and security cameras.

The EV kit features a 2x2P PD or multi-PD redundancy configuration using the ICs. The 2x2P powers a galvanically isolated 100W, 250kHz switching-frequency, activeclamped, synchronous-rectified forward DC-DC converter using the MAX5974D. The device circuit achieves high efficiency by using a forward DC-DC converter topology. The surface-mount transformer provides up to +1500V galvanic isolation for the output. The EV kit output voltage is configured for +12V and provides up to 8.4A load current.

Note: In the multi-PD redundancy mode, the total output power must be reduced to 50W, which is limited by the LAN transformer on board. Its port current must be limited to 1.2A per 2 pair.

The EV kit circuit receives its power from IEEE 802.3af/ at-compliant power-sourcing equipment (PSE). The PSE provides the required -44V to -57V DC power over a twisted-pair Ethernet network cable to the EV kit’s RJ45 connectors. The EV kit features an active FET bridge for separating the DC power provided by an end-span or mid-span Ethernet system


  • Femtocell, Picocell, Microcell
  • Fiber-to-the-Home/Building (FTTH/FTTB)
  • High-Power 2x2P PD
  • IEEE 802.3af/at-Powered Devices (PD)
  • IP Phones
  • IP Security Cameras (IPC)
  • Multi-PD Redundancy
  • Universal Power-over-Ethernet (UPoE)
  • WiMAX® Base Stations
  • Wireless Access Nodes

Applicable Parts


Pricing displayed is based on 1-piece.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.