MAX5952

High-Power, Quad, PSE Controller for Power-Over-Ethernet

Meets IEEE 802.3at Standard and Delivers Up to 45W for High-Power (POE+) PSE Applications

Data Sheet (Rev. 1)
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Overview

  • IEEE 802.3af Compliant/Pre-IEEE 802.3at Compatible
  • Instantaneous Readout of Port Current Through I²C Interface
  • High-Power Mode Enables Up to 45W Per Port
  • High-Capacitance Detection for Legacy Devices
  • Pin Compatible to MAX5945 and LTC4258/LTC4259A
  • Four Independent Power-Switch Controllers
  • PD Detection and Classification
  • Supports Both DC and AC Load Removal Detections
  • I²C-Compatible, 3-Wire Serial Interface
  • Current Foldback and Duty-Cycle-Controlled Current Limit
  • Open-Drain Active-Low INT Signal
  • Direct Fast Shutdown Control Capability

The MAX5952 is a quad -48V power controller designed for use in IEEE® 802.3af-compliant/pre-IEEE 802.3at-compatible power-sourcing equipment (PSE). This device provides powered device (PD) discovery, classification, current limit, DC and AC load disconnect detections in compliance with the IEEE 802.3af standard. The MAX5952 is pin compatible with MAX5945/LTC4258/LTC4259A PSE controllers and provides additional features.

The MAX5952 features high-power mode that provides up to 45W per port. The MAX5952 provides instantaneous readout of each port current through the I²C interface. The MAX5952 also provides high-capacitance detection for legacy PDs.

The device features an I²C-compatible, 3-wire serial interface, and is fully software configurable and programmable. The class-overcurrent detection function enables system power management to detect if a PD draws more than the allowable current. The MAX5952's extensive programmability enhances system flexibility, enables field diagnosis, and allows for uses in other applications.

The MAX5952 provides four operating modes to suit different system requirements. Auto mode allows the device to operate automatically without any software supervision. Semi-automatic mode automatically detects and classifies a device connected to a port after initial software activation, but does not power up that port until instructed to by software. Manual mode allows total software control of the device and is useful for system diagnostics. Shutdown mode terminates all activities and securely turns off power to the ports.

The MAX5952 provides input undervoltage lockout (UVLO), input undervoltage detection, input overvoltage lockout, overtemperature detection, output voltage slew-rate limit during startup, power-good status, and fault status. The MAX5952's programmability includes startup timeout, overcurrent timeout, and load-disconnect detection timeout.

The MAX5952 is available in a 36-pin SSOP package and is rated for both extended (-40°C to +85°C) and upper commercial (0°C to +85°C) temperature ranges.

Applications

  • Midspan Power Injectors
  • Power-Sourcing Equipment (PSE)
  • Switches/Routers
MAX5952
High-Power, Quad, PSE Controller for Power-Over-Ethernet
MAX5952: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

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Evaluation Kits

MAX5952AEVKIT

Evaluation Kit/Evaluation System for the MAX5952A

Buy Now View Details

Features and Benefits

  • IEEE 802.3af and Pre-802.3at-Compliant Power-Sourcing Equipment (PSE) Circuit
  • High-Power Mode Programmable Up to 45W per Port
  • Port Current Readout Through I²C Interface
  • Input Voltages
    • -32V to -60V Providing 4A (-48V Power Circuit, 750mA/Port)
  • Ethernet Network Ports
    • Four RJ-45 10/100BASE-TX Ethernet Network Input Ports
    • Four RJ-45 10/100BASE-TX Ethernet Network Output Power-Over-Ethernet Ports
  • Demonstrates Four Separate Independent Power Switch Controllers
  • Provides PD Detection and Classification
  • Configurable DC/AC Load Removal Detection and Disconnect Monitoring
  • Configurable Current Sensing
  • Convenient Voltage and Current Test Points
  • Four Output-Port LED Status Indicators
  • Optically Isolated 3-Wire I²C-Compliant PC Interface
  • Reconfigurable for Stand-Alone Operation or with an External Microcontroller (Requires +3.3V 100mA Supply)
  • Windows 98SE/2000/XP-Compatible Software
  • Fully Assembled and Tested

Product Details

The MAX5952A evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board featuring an Ethernet four-port power-sourcing equipment (PSE) circuit for -48V supply rail systems. The IEEE 802.3af and pre-802.3at-compliant MAX5952A PSE controller in a 36-pin SSOP package and four n-channel power MOSFETs are used to form the main power-sourcing equipment circuit on the EV kit. The MAX5952A is used in power-over-Ethernet (PoE) applications requiring DC power over four Ethernet network ports. The EV kit provides optical isolation for the I²C-compliant 3-wire interface. The isolated interface can connect to a PC's USB port through a CMAXQUSB interface board. The EV kit can easily be reconfigured for interfacing to a user's stand-alone microcontroller for isolated or nonisolated operation. In stand-alone operation, the user must supply a separate 3.3V power supply capable of supplying 100mA for the EV kit's +3.3V optically isolated 3-wire interface.

The MAX5952A EV kit requires a -32V to -60V power supply (-48V supply rail) capable of supplying 4A or more to the EV kit for the power device (PD) through the four 10/100BASE-TX Ethernet network ports. The EV kit demonstrates PD discovery, classification, current-limit control, and other functions of an IEEE 802.3af and pre-802.3at-compliant PSE.

The MAX5952A controls the -48V DC power to each of the four Ethernet network ports by controlling the port's power MOSFET and sensing current through the respective port's current-sense resistor. The current is fed to a 10/100BASE-TX voice-over-IP magnetic module at each Ethernet output port. The MAX5952A EV kit provides a separate, independent power channel for each of the four Ethernet output ports.

The EV kit demonstrates the full functionality of the MAX5952A for each power channel such as configurable operational modes, high-power modes (programmable for up to 45W per port), port current information through I²C interface, PD detection, PD classification, overcurrent protection, current foldback, under/overvoltage protection and AC-disconnect monitoring. All these features are configurable on the EV kit and additional test points for voltage probing and current measurements have been provided.

The EV kit software is Windows® 98SE/2000/XP compatible and provides a user-friendly interface to demonstrate the features of the MAX5952A while also providing access to each register at the bit level. The program is menu driven and offers a graphic interface with control buttons. The program also includes a macro engine to allow automated evaluation and testing of the MAX5952A at the system level. The program's macro output files can be automatically saved.

Applications

  • Midspan Power Injectors
  • Power-Sourcing Equipment (PSE)
  • Switches/Routers

MAX5952AEVCMAXQU

Evaluation Kit/Evaluation System for the MAX5952A

Buy Now View Details

Features and Benefits

  • IEEE 802.3af and Pre-802.3at-Compliant Power-Sourcing Equipment (PSE) Circuit
  • High-Power Mode Programmable Up to 45W per Port
  • Port Current Readout Through I²C Interface
  • Input Voltages
    • -32V to -60V Providing 4A (-48V Power Circuit, 750mA/Port)
  • Ethernet Network Ports
    • Four RJ-45 10/100BASE-TX Ethernet Network Input Ports
    • Four RJ-45 10/100BASE-TX Ethernet Network Output Power-Over-Ethernet Ports
  • Demonstrates Four Separate Independent Power Switch Controllers
  • Provides PD Detection and Classification
  • Configurable DC/AC Load Removal Detection and Disconnect Monitoring
  • Configurable Current Sensing
  • Convenient Voltage and Current Test Points
  • Four Output-Port LED Status Indicators
  • Optically Isolated 3-Wire I²C-Compliant PC Interface
  • Reconfigurable for Stand-Alone Operation or with an External Microcontroller (Requires +3.3V 100mA Supply)
  • Windows 98SE/2000/XP-Compatible Software
  • Fully Assembled and Tested

Product Details

The MAX5952A evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board featuring an Ethernet four-port power-sourcing equipment (PSE) circuit for -48V supply rail systems. The IEEE 802.3af and pre-802.3at-compliant MAX5952A PSE controller in a 36-pin SSOP package and four n-channel power MOSFETs are used to form the main power-sourcing equipment circuit on the EV kit. The MAX5952A is used in power-over-Ethernet (PoE) applications requiring DC power over four Ethernet network ports. The EV kit provides optical isolation for the I²C-compliant 3-wire interface. The isolated interface can connect to a PC's USB port through a CMAXQUSB interface board. The EV kit can easily be reconfigured for interfacing to a user's stand-alone microcontroller for isolated or nonisolated operation. In stand-alone operation, the user must supply a separate 3.3V power supply capable of supplying 100mA for the EV kit's +3.3V optically isolated 3-wire interface.

The MAX5952A EV kit requires a -32V to -60V power supply (-48V supply rail) capable of supplying 4A or more to the EV kit for the power device (PD) through the four 10/100BASE-TX Ethernet network ports. The EV kit demonstrates PD discovery, classification, current-limit control, and other functions of an IEEE 802.3af and pre-802.3at-compliant PSE.

The MAX5952A controls the -48V DC power to each of the four Ethernet network ports by controlling the port's power MOSFET and sensing current through the respective port's current-sense resistor. The current is fed to a 10/100BASE-TX voice-over-IP magnetic module at each Ethernet output port. The MAX5952A EV kit provides a separate, independent power channel for each of the four Ethernet output ports.

The EV kit demonstrates the full functionality of the MAX5952A for each power channel such as configurable operational modes, high-power modes (programmable for up to 45W per port), port current information through I²C interface, PD detection, PD classification, overcurrent protection, current foldback, under/overvoltage protection and AC-disconnect monitoring. All these features are configurable on the EV kit and additional test points for voltage probing and current measurements have been provided.

The EV kit software is Windows® 98SE/2000/XP compatible and provides a user-friendly interface to demonstrate the features of the MAX5952A while also providing access to each register at the bit level. The program is menu driven and offers a graphic interface with control buttons. The program also includes a macro engine to allow automated evaluation and testing of the MAX5952A at the system level. The program's macro output files can be automatically saved.

Applications

  • Midspan Power Injectors
  • Power-Sourcing Equipment (PSE)
  • Switches/Routers
MAX5952AEVKIT
Evaluation Kit/Evaluation System for the MAX5952A
MAX5952AEVCMAXQU
Evaluation Kit/Evaluation System for the MAX5952A

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