MAX5971A
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MAX5971A

Single-Port, 40W, IEEE 802.3af/at PSE Controller with Integrated MOSFET

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40W, Single-Port, IEEE 802.3af/at-Compliant PSE Controller with Integrated 0.5Ω Power MOSFET and Sense Resistor

Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $5.63
Features
  • IEEE 802.3af/at Compliant
  • Up to 40W for Single-Port PSE Applications
  • Integrated 0.5Ω Power MOSFET and Sense Resistor
  • PD Detection and Classification
  • Programmable Current Limit for Class 5 PDs
  • High-Capacitance Detection for Legacy Devices
  • Supports Both DC and AC Load Removal Detections
  • Current Foldback and Duty Cycle-Controlled Current Limit
  • LED Indicator for Port Status
  • Direct Fast-Shutdown Control Capability
  • Space-Saving, 28-Pin TQFN (5mm x 5mm) Package
Additional Details
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The MAX5971A is a single-port, power-sourcing equipment (PSE) power controller designed for use in IEEE® 802.3af/at-compliant PSE. This device provides powered device (PD) discovery, classification, current limit, DC and AC load-disconnect detections. The MAX5971A operates automatically without the need for any software programming and features an integrated power MOSFET and sense resistor. The device also supports new Class 5 and 2-event classification for detection and classification of high-power PDs. The MAX5971A provides up to 40W to a single port (Class 5 enabled) and still provides high-capacitance detection for legacy PDs.

The MAX5971A provides input undervoltage lockout (UVLO), input overvoltage lockout, overtemperature detection, output voltage slew-rate limit during startup, and LED status indication.

The MAX5971A is available in a space-saving, 28-pin TQFN (5mm x 5mm) power package, and is rated for the extended (-40°C to +85°C) temperature range.

Applications

  • Industrial Automation Equipment
  • Single-Port PSE End-Point Applications
  • Single-Port PSE Power Injectors (Midspan Applications)
  • Switches/Routers
  • Wireless LAN Access Points/WiMAX™ Base Station
Part Models 2
1ku List Price Starting From $5.63

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Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX5971AETI+
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Product Lifecycle

PCN

Jun 20, 2016

- 1612

ASSEMBLY

MAX5971AETI+

PRODUCTION

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PRODUCTION

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Jun 20, 2016

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ASSEMBLY

MAX5971AETI+

PRODUCTION

MAX5971AETI+T

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX5971AEVKIT

Evaluation Kit for the MAX5971A

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MAX5971AEVKIT

Evaluation Kit for the MAX5971A

Evaluation Kit for the MAX5971A

Features and Benefits

  • IEEE 802.3af/at-Compliant PSE Circuit
  • High-Power Class 5 Mode Configurable Up to 40W
  • -32V to -60V Input Voltage Providing 1A
  • Ethernet Network Ports
    • RJ45 10/100/1000BASE-TX Ethernet Network Data Input Port
    • RJ45 10/100/1000BASE-TX Ethernet Network PSE Output Port
  • Demonstrates IC's Internal Power Switch and Current Sensing
  • Demonstrates Standard and Legacy PD Detection and Classification
  • Configurable for Midspan or End-Point Mode
  • Configurable AC/DC Load-Removal Detection and Disconnect Monitoring
  • Convenient Voltage and Current Test Points
  • Demonstrates the EV Kit Circuit's Output Port LED-Status Indicator
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Detail

The MAX5971A evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board featuring an Ethernet single-port power-sourcing equipment (PSE) circuit for -54V supply rail systems. The IEEE® 802.3af/at-compliant MAX5971A PSE controller IC, in a 28-pin TQFN package, features an internal n-channel power MOSFET forming the main PSE circuit on the EV kit. The IC is used in power-over-Ethernet (PoE) applications requiring DC power over a single Ethernet network port.

The EV kit requires a -32V to -60V power supply (-54V supply rail) capable of supplying 1A or more to the EV kit for powering the powered device (PD) through the 10/100/1000BASE-TX Ethernet network port. The EV kit demonstrates PD discovery, classification, currentlimit control, and other functions of an IEEE 802.3af/at-compliant PSE.

The IC controls the -54V DC power to the Ethernet network port by sensing current through the port and controlling the IC's internal power MOSFET. The current is fed to a 1 x 1 gigabit MagJack® module at the EV kit's Ethernet output port.

The EV kit demonstrates the full functionality of the IC's operational modes, such as configurable high-power modes (programmable up to 40W), PD detection, PD classification, overcurrent protection, current foldback, undervoltage/overvoltage protection, and AC-/DC-disconnect monitoring. All these features are configurable on the EV kit, with additional test points for voltage probing and current measurements provided. The EV kit can also be configured for midspan or end-point network operation.

Applications

  • Industrial Automation Equipment
  • Single-Port PSE End-Point Applications
  • Single-Port PSE Power Injectors (Midspan Applications)
  • Switches/Routers
  • Wireless LAN Access Points/WiMAX™ Base Station

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