MAX5971A Maxim Integrated Products, MAX5971A Datasheet

MAX5971A

Manufacturer Part Number

MAX5971A

Description

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

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX5971A.pdf (21 pages)

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19-5142; Rev 0; 1/10

The MAX5971A is a single-port, power-sourcing equip-

ment (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 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 (-40NC to +85NC) temperature range.

IEEE is a registered service mark of the Institute of Electrical

and Electronics Engineers, Inc.

WiMAX is a trademark of WiMAX Forum.

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.

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

_______________________________________________________________ Maxim Integrated Products 1

General Description

Single-Port, 40W, IEEE 802.3af/at PSE

Controller with Integrated MOSFET

Applications

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

MAX5971AETI+

IEEE 802.3af/at Compliant

Up to 40W for Single-Port PSE Applications

Integrated 0.5I 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

-54V

PART

LED

PWMEN

LEGACY

MIDSPAN

OSC

Typical Operating Circuit

EE_DIG

MAX5971A

-40NC to +85NC

TEMP RANGE

Ordering Information

AGND

OUTP

ILIM1

ILIM2

OUT

DET

PIN-PACKAGE

28 TQFN-EP*

Features

PSE OUTPUT

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