_______________________________________________________________ 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.

_______________________________________________________________ Maxim Integrated Products 1

IEEE 802.3af/at-Compliant, Powered Device Interface

Controllers with Integrated Power MOSFET

General Description

The MAX5969A/MAX5969B provide a complete interface

for a powered device (PD) to comply with the IEEE®

802.3af/at standard in a power-over-Ethernet (PoE) sys-

tem. The MAX5969A/MAX5969B provide the PD with a

detection signature, classification signature, and an inte-

grated isolation power switch with inrush current control.

During the inrush period, the MAX5969A/MAX5969B limit

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 devices feature

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

conditions. The MAX5969A/MAX5969B can withstand up

to 100V at the input.

The MAX5969A/MAX5969B support a 2-event classifica-

tion method as specified in the IEEE 802.3at standard

and provide a signal to indicate when probed by Type 2

power-sourcing equipment (PSE). The devices detect

the presence of a wall adapter power-source connec-

tion and allow a smooth switchover from the PoE power

source to the wall power adapter.

The MAX5969A/MAX5969B also provide a power-good

(PG) signal, two-step current limit and foldback, over-

temperature protection, and di/dt limit.

The MAX5969A/MAX5969B are available in a space-sav-

ing, 10-pin, 3mm x 3mm, TDFN power package. These

devices are 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

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 (MAX5969A)

S

IEEE 802.3af/at-Compliant, 40V UVLO (MAX5969B)

S

Overtemperature Protection

S

Thermally Enhanced, 3mm x 3mm, 10-Pin TDFN

19-5008; Rev 0; 12/09

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

*EP = Exposed pad.

Ordering Information

Pin Configuration

IEEE is a registered service mark of the Institute of Electrical

and Electronics Engineers, Inc.

WiMAX is a trademark of WiMAX Forum.

EVALUATION

KIT

AVAILABLE

PART

TEMP RANGE

PIN-

PACKAGE

UVLO

THRESHOLD

(V)

MAX5969AETB+

-40NC to +85NC 10 TDFN-EP*

35.4

MAX5969BETB+

-40NC to +85NC 10 TDFN-EP*

38.6

1

3

4

10

8

7

CLS

PG

WAD

N.C.

I.C.

EP*

MAX5969A

MAX5969B

2

9

2EC

DET

5

6

RTN

TDFN

(3mm × 3mm)

TOP VIEW

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