MAX5952_10 datasheet(1/50 Pages) MAXIM

Part #	MAX5952

Description	High-Power, Quad, PSE Controller for Power-Over-Ethernet

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Manufacturer	MAXIM [Maxim Integrated Products]

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General Description

The MAX5952 is a quad -48V power controller

designed for use in IEEE® 802.3af-compliant/pre-IEEE

802.3at-compatible power-sourcing equipment (PSE).

This device provides powered device (PD) discovery,

classification, current limit, DC and AC load disconnect

detections in compliance with the IEEE 802.3af stan-

dard. The MAX5952 is pin compatible with MAX5945/

LTC4258/LTC4259A PSE controllers and provides addi-

tional features.

The MAX5952 features high-power mode that provides

up to 45W per port. The MAX5952 provides instanta-

neous readout of each port current through the I2C inter-

face. The MAX5952 also provides high-capacitance

detection for legacy PDs.

The device features an I2C-compatible, 3-wire serial inter-

face, and is fully software configurable and programma-

ble. The class-overcurrent detection function enables

system power management to detect if a PD draws more

than the allowable current. The MAX5952’s extensive pro-

grammability enhances system flexibility, enables field

diagnosis, and allows for uses in other applications.

The MAX5952 provides four operating modes to suit dif-

ferent system requirements. Auto mode allows the device

to operate automatically without any software supervision.

Semi-automatic mode automatically detects and classi-

fies a device connected to a port after initial software acti-

vation, but does not power up that port until instructed to

by software. Manual mode allows total software control of

the device and is useful for system diagnostics.

Shutdown mode terminates all activities and securely

turns off power to the ports.

The MAX5952 provides input undervoltage lockout

(UVLO), input undervoltage detection, input overvolt-

age lockout, overtemperature detection, output voltage

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

fault status. The MAX5952’s programmability includes

startup timeout, overcurrent timeout, and load-discon-

nect detection timeout.

The MAX5952 is available in a 36-pin SSOP package and

is 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

I2C Interface

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

o High-Capacitance Detection for Legacy Devices

o Pin Compatible to MAX5945 and

LTC4258/LTC4259A

o Four Independent Power-Switch Controllers

o PD Detection and Classification

o Supports Both DC and AC Load Removal

Detections

o I2C-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

High-Power, Quad, PSE Controller

for Power-Over-Ethernet

________________________________________________________________

Maxim Integrated Products

1

19-0858; Rev 1; 1/10

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 and Selector Guide appear at end of data

sheet.

EVALUATION

KIT

AVAILABLE

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX5952AEAX+*

-40°C to +85°C

36 SSOP

MAX5952AUAX+

0°C to +85°C

36 SSOP

MAX5952CEAX+*

-40°C to +85°C

36 SSOP

MAX5952CUAX+*

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.

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