MAX5972AETE+T【PDF 1/13 页】IC CONTROLLER INTERFACE 16TQFN

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IEEE 802.3af/at-Compliant, Powered Device Interface

Controller with Integrated Power MOSFET

_______________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxims website at www.maxim-ic.com.

General Description

The MAX5972A provides a complete interface for a

powered device (PD) to comply with the IEEE

?/DIV>

802.3af/

at standard in a power-over-Ethernet (PoE) system. The

MAX5972A provides the PD with a detection signature,

classification signature, and an integrated isolation

power switch with inrush current control. During the

inrush period, the MAX5972A limits the current to less

than 180mA before switching to the higher current limit

(720mA to 880mA) when the isolation power MOSFET

is fully enhanced. The device features an input UVLO

with wide hysteresis and long deglitch time to compen-

sate for twisted-pair cable resistive drop and to assure

glitch-free transition during power-on/-off conditions. The

MAX5972A can withstand up to 100V at the input.

The MAX5972A supports a 2-event classification method

as specified in the IEEE 802.3at standard and provides a

signal to indicate when probed by Type 2 power-sourcing

equipment (PSE). The device detects the presence of

a wall adapter power-source connection and allows a

smooth switch over from the PoE power source to the

wall power adapter.

The MAX5972A also provides a power-good (PG) signal,

two-step current limit and foldback, overtemperature

protection, and di/dt limit.

The MAX5972A is available in a 16-pin, 5mm x 5mm,

TQFN power package. This device is rated over the

-40NC to +85NC extended temperature range.

Applications

IEEE 802.3af/at-Powered Devices

IP Phones, Wireless Access Nodes, IP Security

Cameras

WiMAXK Base Station

Features

S IEEE 802.3af/at Compliant

S 2-Event Classification or an External Wall Adapter

Indicator Output

S Simplified Wall Adapter Interface

S PoE Classification 0 to 5

S 100V Input Absolute Maximum Rating

S Inrush Current Limit of 180mA Maximum

S Current Limit During Normal Operation Between

720mA and 880mA

S Current Limit and Foldback

S Legacy UVLO at 36V

S Overtemperature Protection

S Thermally Enhanced, 5mm x 5mm, 16-Pin TQFN

19-4924; Rev 1; 2/10

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

*EP = Exposed pad.

Ordering Information

Pin Configuration

WiMAX is a trademark of WiMAX Forum.

IEEE is a registered service mark of the Institute of Electrical

and Electronics Engineers, Inc.

TQFN

(5mm ?/DIV>

5mm)

TOP VIEW

*EP = EXPOSED PAD. CONNECT TO V

EP*

DET

I.C.

CLS

2EC

WAD

MAX5972A

N.C.

PART

TEMP RANGE

PIN-

PACKAGE

SLEEP

MODE

MAX5972AETE+

-40NC to +85NC 16 TQFN-EP*

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