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

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

Product Details

Key Features

Parametric specs for Power Sourcing Equipment
Compliance IEEE 802.3af
IEEE 802.3at
High Power Mode Yes
# Channels 1
Port Current Readout No
Load Disconnect AC/DC
DC
Package/Pins TQFN/28
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
5.63
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Simplified Block Diagram

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Parameters

Parametric specs for Power Sourcing Equipment
Compliance IEEE 802.3af
IEEE 802.3at
High Power Mode Yes
# Channels 1
Port Current Readout No
Load Disconnect AC/DC
DC
Package/Pins TQFN/28
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
5.63

Key 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

Applications/Uses

  • 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

Description

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.

Simplified Block Diagram

MAX5971A: Typical Operating Circuit MAX5971A: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.