MAX5980

Quad, IEEE 802.3at/af PSE Controller for Power-over-Ethernet

Lowest Power Loss with System Power Management Enables High-Power Applications Beyond IEEE 802.3af/at Standards

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Overview

Features and Benefits
Product Details

Features and Benefits

IEEE 802.3at/af Compliant
0.25Ω Current-Sensing Resistor
Up to 70W per Port for PSE Applications
9-Bit Port Current and Voltage Monitoring
I²C-Compatible, 3-Wire Serial Interface
Supports Single-Supply Operation
High-Capacitance Detection for Legacy Devices
Supports DC Load-Removal Detections
Space-Saving, 32-Pin TQFN (5mm x 5mm) Power Package

Product Details

The MAX5980 is a quad, power-sourcing equipment (PSE) power controller designed for use in IEEE® 802.3at/af-compliant PSE. This device provides powered device (PD) discovery, classification, current limit, and load disconnect detection. The device supports both fully automatic operation and software programmability. The device also supports new 2-event classification and Class 5 for detection and classification of high-power PDs. The device supports single-supply operation, provides up to 70W to each port (Class 5 enabled), and still 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 device provides instantaneous readout of port current and voltage through the I²C interface. The device's extensive programmability enhances system flexibility, enables field diagnosis, and allows for uses in other, nonstandard applications.

The device is available in a space-saving, 32-pin TQFN (5mm x 5mm) power package and is rated for the automotive (-40°C to +105°C) temperature range.

Applications

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

Product Categories

Power Monitor, Control, and Protection
- PoE Power Sourcing Equipment (PSE)

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Product Lifecycle Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

MAX5980EVKIT

Evaluation Kit for the MAX5980

MAX5980EVKIT

View Detailed Evaluation Kit Information

The MAX5980 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board featuring an Ethernet 4-port power-sourcing equipment (PSE) circuit for -48V or -54V supply rail systems. The IEEE® 802.3af/at-compliant MAX5980 PSE controller, in a 32-pin TQFN-EP package, and four n-channel power MOSFETs are used to form the main PSE circuit on the EV kit. The IC 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-compatible 3-wire interface. The isolated interface can connect to a PC's USB port through an on-board USB interface circuit. 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 (with respect to VEE) capable of supplying 100mA for the EV kit's +3.3V optically isolated 3-wire interface.

The EV kit requires a -32V to -60V power supply (-48V/-54V supply rail) capable of supplying 4A or more to the EV kit for powering the powered device (PD) through the four 10/100/1000BASE-TX Ethernet network ports. The EV kit demonstrates PD discovery, classification, current-limit control, and other functions of an IEEE 802.3af/at-compliant PSE circuit.

The IC controls the -48V/-54V DC power to each of the four Ethernet network ports by controlling the ports' power MOSFET and sensing current through the respective port's current-sense resistor. The current is fed to a 10/100/1000BASE-TX magnetic module at each Ethernet output port. The 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 IC for each power channel, such as configurable operational modes, high-power mode (programmable up to 30W per port or up to 60W in a 2 x 2 pair configuration), port current information through the I²C interface, PD detection, PD classification, overcurrent protection, current foldback, under/overvoltage protection, and DC disconnect monitoring. All these features are configurable on the EV kit. Additional test points for voltage probing and current measurements have also been provided.

The EV kit includes Windows XP®-, Windows Vista®-, and Windows® 7-compatible software and provides a user-friendly interface to demonstrate the features of the IC, while also providing access to each register at the bit level. The program is menu-driven and offers a graphical user interface (GUI) with control buttons. The program also includes a macro engine to allow automated evaluation and testing of the IC at the system level. The program's macro output files can be automatically saved.

Applications

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

Features & Benefits

IEEE 802.3af/at-Compliant PSE Circuit
High-Power Mode (Programmable Up to 30W per Port or Up to 60W in a 2 x 2 Pair Configuration)
Port Current Readout Through the I²C Interface
Input Voltages
- -32V to -60V Providing 4A (-48V/-54V Power Circuit, 1A/Port)
Ethernet Network Ports
- Four RJ45 10/100/1000BASE-TX Ethernet Network Input Ports
- Four RJ45 10/100/1000BASE-TX Ethernet Network Output PoE Ports
Demonstrates Four Separate Independent Power Switch Controllers
Demonstrates PD Detection and Classification
DC Load Removal Detection and Disconnect Monitoring
Convenient Voltage and Current Test Points
Four Output-Port LED Status Indicators
Optically Isolated I²C-Compatible 3-Wire PC Interface
Reconfigurable for Stand-Alone Operation or with an External Microcontroller (Requires a +3.3V, 100mA Supply)
Windows XP-, Windows Vista-, and Windows 7-Compatible Software
Proven PCB Layout
Fully Assembled and Tested

Documentation & Resources

Data Sheet

MAX5980: Quad, IEEE 802.3at/af PSE Controller for Power-over-Ethernet Data Sheet (Rev. 1)
10/18/2011
PDF

Reliability Data

MAX5980 Reliability Data
1/12/2023
PDF

Design Note

PoE and LED Lighting: the Perfect Match
4/24/2015

Tools & Simulations

Software Development

MAX5980 EV KIT Software, 1.1.0

EXE

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number	Material Declaration	Reliability Data	Pin/Package Drawing	CAD Symbols, Footprints & 3D Models
MAX5980GTJ+	Material Declaration	Reliability Data	32-LFCSP-5X5X0.75	Ultra Librarian SamacSys
MAX5980GTJ+T	Material Declaration	Reliability Data	32-LFCSP-5X5X0.75	Ultra Librarian SamacSys
Wafer Fabrication Data		MAX5980 Reliability Data

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Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

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.