Document
19-5142; Rev 0; 1/10
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Single-Port, 40W, IEEE 802.3af/at PSE Controller with Integrated MOSFET
Features
S IEEE 802.3af/at Compliant S Up to 40W for Single-Port PSE Applications S Integrated 0.5I Power MOSFET and Sense
General 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, and 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 highcapacitance 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 (-40NC to +85NC) temperature range.
MAX5971A
Resistor
S PD Detection and Classification S Programmable Current Limit for Class 5 PDs S High-Capacitance Detection for Legacy Devices S Supports Both DC and AC Load Removal
Detections
S Current Foldback and Duty Cycle-Controlled
Current Limit
S LED Indicator for Port Status S Direct Fast-Shutdown Control Capability S Space-Saving, 28-Pin TQFN (5mm x 5mm)
Package
Ordering Information
PART MAX5971AETI+ TEMP RANGE -40NC to +85NC PIN-PACKAGE 28 TQFN-EP*
Applications
Single-Port PSE End-Point Applications Single-Port PSE Power Injectors (Midspan Applications) Switches/Routers Industrial Automation Equipment Wireless LAN Access Point/WiMAX™ Base Station
+Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad.
Typical Operating Circuit
PSE OUTPUT
AGND OUT OUTP
-54V
VEE VEE_DIG LED PWMEN LEGACY MIDSPAN OSC EN
MAX5971A
DET ILIM1 ILIM2
IEEE is a registered service mark of the Institute of Electrical and Electronics Engineers, Inc. WiMAX is a trademark of WiMAX Forum.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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Single-Port, 40W, IEEE 802.3af/802.3at PSE Controller with Integrated MOSFET MAX5971A
ABSOLUTE MAXIMUM RATINGS
(Voltages referenced to VEE, unless otherwise noted.) AGND, DET, LED...................................................-0.3V to +80V OUT.......................................................-0.3V to (VAGND + 0.3V) OUTP........................................................-6V to (VAGND + 0.3V) VEE_DIG. ........................................