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

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

* 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