MAX5981AETE+ Maxim Integrated Products, MAX5981AETE+ Datasheet

MAX5981AETE+

Manufacturer Part Number

MAX5981AETE+

Description

Power Switch ICs - POE / LAN IEEE 802.3af/at PDIC Controller

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX5981AETE.pdf (16 pages)

Specifications of MAX5981AETE+

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19-5732; Rev 2; 8/11

The MAX5981 provides a com plete interface for a pow-

ered device (PD) to comply with the IEEE

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

MAX5981 provides the PD with a detection signature,

classifica tion signature, and an integrated isolation

power switch with inrush current control. During the

inrush period, the MAX5981 limits the current to less

than 180mA before switching to the higher cur rent 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 compensate for

twisted-pair cable resistive drop and to assure glitch-free

transition during power-on/-off condi tions. The MAX5981

can with stand up to 100V at the input.

The MAX5981 supports a 2-Event classification method

as specified in the IEEE 802.3at standard and provides a

signal to indicate when probed by a Type 2 power sourc-

ing 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 MAX5981 also provides a power-good (PG) signal,

two-step current limit and fold back, overtemperature

protection, and di/dt limit. A sleep mode feature in

the MAX5981 provides low power consumption while

supporting Maintain Power Signature (MPS). An ultra-

low-power sleep mode feature in the MAX5981 further

reduces power consump tion while still supporting MPS.

The MAX5981 also features an LED driver that is auto-

matically activated during sleep mode. During sleep

mode, the LED driver sources a peri odic current (I

250Hz (MAX5981A) or 15.625kHz (MAX5981B).

The MAX5981 is available in a 16-pin, 5mm x 5mm TQFN

power package. The device is rated over the -40°C to

+85°C extended temperature range.

WiMAX is a trademark of WiMAX Forum.

IEEE is a registered service mark of the Institute of Electrical

and Electronics Engineers, Inc.

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.

IEEE 802.3af/at-Compliant, Powered Device Interface

_______________________________________________________________ Maxim Integrated Products 1

Controllers with

General Description

802.3af/at

LED

) at

Integrated Power MOSFET

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

*EP = Exposed pad.

MAX5981AETE+

MAX5981BETE+

Sleep Mode and Ultra-Low Power

IEEE 802.3af/at Compliant

2-Event Classification or an External Wall Adapter

Indicator Output

Simplified Wall Adapter Interface

PoE Classification 0–5

100V Input Absolute Maximum Rating

Inrush Current Limit of 180mA Maximum

Current Limit During Normal Operation Between

720mA and 880mA

Current Limit and Foldback

Legacy UVLO at 36V

LED Driver with Programmable LED Current

Overtemperature Protection

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

PART

IEEE 802.3af/at Powered Devices

IP Phones, Wireless Access Nodes, IP Security

Cameras

WiMAXK Base Stations

-40NC to +85NC

TEMP RANGE

Ordering Information

16 TQFN-EP*

PIN-

PACKAGE

Applications

Features

SLEEP

MODE

Yes

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