MAX5986B

PRODUCTION

IEEE 802.3af-Compliant, High-Efficiency, Class 1/Class 2, Powered Devices with Integrated DC-DC Converter

Highly Integrated Powered Devices Reduce BOM Cost and Improve Efficiency

Data Sheet (Rev. 7) Product Selection Table
Part Models
2
1ku List Price
Starting From $4.47
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Part Details

  • High Integration Saves Space and BOM Cost
    • Efficient, Integrated DC-DC Converter (with Integrated Switches)
    • Built-In Output-Voltage Monitoring
    • Protects Against Overload, Output Short Circuit, Output Overvoltage, and Overtemperature
    • Integrated TVS Diode Withstands Cable Discharge Event (CDE)
    • Internal LDO Regulator with Up to 100mA Load (MAX5987A)
  • IEEE 802.3af-Compliant Features Reduce Design Time
    • PoE Class 1/Class 2 Classification Set with Single Resistor
    • Intelligent Maintain Power Signature (MPS) Complies with IEEE 802.3af Specification
    • Simplified Wall Adapter Interface
    • Pass 2kV, 200m CAT-6 Cable Discharge Event
  • High Efficiency During Light Loads Reduces Power Consumption
    • Sleep and Ultra-Low-Power Mode (MAX5986A/MAX5986B/MAX5986C)
    • Frequency Foldback for High-Efficiency Light-Load Operation
    • Back-Bias Capability to Optimize the Efficiency
  • Robust Performance
    • 8.7V to 60V Wide Input Voltage Range
    • Hiccup-Mode Runaway Current Limit
    • 49mA (typ) Inrush Current Limit
    • Open-Drain (Active-Low RESET) Output (MAX5987A)
  • Flexible and Easy to Design With
    • 3.0V to 14V Programmable Output Voltage Range
    • Internal Compensation
    • Fixed 215kHz/430kHz Switching Frequency
    • Fixed 3.3V or Adjustable Output Voltage through an External Resistive Divider
MAX5986B
IEEE 802.3af-Compliant, High-Efficiency, Class 1/Class 2, Powered Devices with Integrated DC-DC Converter
MAX5986A, MAX5987A: Functional Diagram
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Documentation

Data Sheet 1

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Evaluation Kits

MAX5986AEVKIT

Evaluation Kit for the MAX5986A

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Features and Benefits

  • IEEE 802.3af/at-Compliant PD Interface Circuit
  • PoE Classification 1
  • -36V to -57V Input Range
  • Demonstrates an Integrated 3.84W Step-Down DC-DC Converter
  • +5V Output at 768mA
  • Inrush Current Limit of 49mA (typ)
  • Evaluates Endspan and Midspan Ethernet Systems
  • Simplified Wall Adapter Interface
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Details

The MAX5986A evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board featuring an Ethernet port, network powered-device (PD) interface controller circuit for -57V supply rail systems. The EV kit uses the MAX5986A IEEE® 802.3af/at-compliant network PD interface controller in a 16-pin TQFN package with an exposed pad. The IC is used in Power-over-LAN (PoL) applications requiring DC power from an Ethernet network port for PDs such as IP phones, wireless access nodes, and security cameras.
The EV kit receives power from IEEE 802.3af/at-compliant power-sourcing equipment (PSE). Refer to the MAX5952, MAX5965A/MAX5965B, and MAX5980 IC data sheets for PSE controllers. The PSE provides the required -36V to -57V DC power over an unshielded twisted-pair Ethernet network cable to the EV kit’s RJ45 magnetic jack. The EV kit features a 1 x 1 Gigabit RJ45 magnetic jack and two active full-wave rectifiers (N101 and N102) for separating the DC power provided by an endspan or midspan Ethernet system.
The EV kit can also be powered by a wall adapter power source. The EV kit provides PCB pads to accept the output of a wall adapter power source. When a wall adapter power source is detected, it always takes precedence over the PSE source and allows the wall adapter to power the EV kit.
The EV kit demonstrates the full functionality of the IC, such as PD detection signature, PD classification signature, inrush current control, input undervoltage lockout (UVLO), and an integrated DC-DC step-down converter. The integrated step-down converter operates at a fixed 275kHz switching frequency, and is configured for a nonisolated +5V DC output that can deliver 768mA of current.
Warning: The EV kit is designed to operate with high voltages. Dangerous voltages are present on this EV kit and on equipment connected to it. Users who power up this EV kit or power the sources connected to it must be careful to follow safety procedures appropriately to work with high-voltage electrical equipment.
Under severe fault or failure conditions, this EV kit may dissipate large amounts of power, which could result in the mechanical ejection of a component or of component debris at high velocity. Operate this kit with care to avoid possible personal injury.

Applications

  • IEEE 802.3af-Powered Devices
  • IP Phones
  • IP Security Cameras
  • WiMAX® Base Stations
  • Wireless Access Nodes
MAX5986AEVKIT
Evaluation Kit for the MAX5986A

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