Rainbow-electronics MAX5965B Manual de usuario descargar pdf

General Description

The MAX5965A/MAX5965B are quad, monolithic, -48V

power controllers designed for use in IEEE

802.3af-com-

pliant/pre-IEEE 802.3at-compatible power-sourcing equip-

ment (PSE). These devices provide powered device (PD)

discovery, classification, current limit, DC and AC load dis-

connect detections in compliance with the IEEE 802.3af

standard. The MAX5965A/MAX5965B are pin compatible

with the MAX5952/MAX5945/LTC4258/LTC4259A PSE

controllers and provide additional features.

The MAX5965A/MAX5965B feature a high-power mode

that provides up to 45W per port. The MAX5965A/

MAX5965B provide new Class 5 and 2-event classifica-

tion (Class 6) for detection and classification of high-

power PDs. The MAX5965A/MAX5965B provide

instantaneous readout of each port current through the

C interface. The MAX5965A/MAX5965B also provide

high-capacitance detection for legacy PDs.

These devices feature an I

C-compatible, 3-wire serial inter-

face, and are fully software configurable and programmable.

The class-overcurrent detection function enables system

power management to detect if a PD draws more than the

allowable current. The MAX5965A/MAX5965B’s extensive

programmability enhances system flexibility, enables field

diagnosis, and allows for uses in other applications.

The MAX5965A/MAX5965B provide four operating modes

to suit different system requirements. Auto mode allows

the devices to operate automatically without any software

supervision. Semi-automatic mode automatically detects

and classifies a device connected to a port after initial

software activation, but does not power up that port until

instructed to by software. Manual mode allows total soft-

ware control of the device and is useful for system diag-

nostics. Shutdown mode terminates all activities and

securely turns off power to the ports.

The MAX5965A/MAX5965B provide input undervoltage

lockout (UVLO), input undervoltage detection, a load-

stability safety check during detection, input overvolt-

age lockout, overtemperature detection, output voltage

slew-rate limit during startup, power-good status, and

fault status. The MAX5965A/MAX5965B’s programma-

bility includes startup timeout, overcurrent timeout, and

load-disconnect detection timeout.

The MAX5965A/MAX5965B are available in a 36-pin SSOP

package and are rated for both extended (-40°C to +85°C)

and upper commercial (0°C to +85°C) temperature ranges.

Applications

Power-Sourcing Equipment (PSE)

Switches/Routers

Midspan Power Injectors

Features

o IEEE 802.3af Compliant/Pre-IEEE 802.3at

Compatible

o Instantaneous Readout of Port Current Through

C Interface

o High-Power Mode Enables Up to 45W Per Port

o High-Capacitance Detection for Legacy Devices

o Pin Compatible with MAX5952/MAX5945/

LTC4258/LTC4259A

o Four Independent Power-Switch Controllers

o PD Detection and Classification (Including 2-

Event Classification)

o Load-Stability Safety Check During Detection

o Supports Both DC and AC Load Removal

Detections

o I

C-Compatible, 3-Wire Serial Interface

o Current Foldback and Duty-Cycle-Controlled

Current Limit

o Open-Drain INT Signal

o Direct Fast Shutdown Control Capability

o Special Class 5 Classification

MAX5965A/MAX5965B

High-Power, Quad, Monolithic, PSE Controllers

for Power over Ethernet

________________________________________________________________

Maxim Integrated Products

19-4593; Rev 0; 7/09

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.

Pin Configuration appears at end of data sheet.

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX5965AEAX+ -40°C to +85°C 36 SSOP

MAX5965AUAX+* 0°C to +85°C 36 SSOP

MAX5965BEAX+ -40°C to +85°C 36 SSOP

MAX5965BUAX+* 0°C to +85°C 36 SSOP

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

Future product—contact factory for availability.

IEEE is a registered service mark of the Institute of Electrical and Electronics Engineers, Inc.

Selector Guide

PART PIN-PACKAGE

AC DISCONNECT

FEATURE

MAX5965AEAX+ 36 SSOP No

MAX5965AUAX+ 36 SSOP No

MAX5965BEAX+ 36 SSOP Yes

MAX5965BUAX+ 36 SSOP Yes

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Pagina 1 - MAX5965A/MAX5965B

General DescriptionThe MAX5965A/MAX5965B are quad, monolithic, -48Vpower controllers designed for use in IEEE®802.3af-com-pliant/pre-IEEE 802.3at-comp

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MAX5965A/MAX5965BHigh-Power, Quad, Monolithic, PSE Controllers for Power over Ethernet10 _____________________________________________________________

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