Rainbow-electronics MAX5971А Manual do Utilizador descarregar pdf

_______________________________________________________________ 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.

MAX5971A

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

Controller with Integrated MOSFET

19-5142; Rev 0; 1/10

Typical Operating Circuit

General Description

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.

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

Features

S IEEE 802.3af/at Compliant

S Up to 40W for Single-Port PSE Applications

S Integrated 0.5I Power MOSFET and Sense

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

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

*EP = Exposed pad.

Ordering Information

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

MAX5971AETI+

-40NC to +85NC

28 TQFN-EP*

-54V

AGND

LED

PWMEN

EE_DIG

LEGACY

MIDSPAN

OSC

OUT

OUTP

DET

ILIM1

ILIM2

MAX5971A

PSE OUTPUT

1 2 3 4 5 6 ... 20 21

MAX5971A 1

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Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

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Rainbow-electronics MAX5971А Manual do Utilizador

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