MAX5938LEEE+【PDF 1/26 页】IC HOT-SWAP CTRLR -48V 16-QSOP

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General Description

The MAX5938 is a hot-swap controller for -10V to -80V

rails. The MAX5938 allows circuit line cards to be safely

hot-plugged into a live backplane without causing a

glitch on the power supply. It integrates an adjustable

circuit-breaker function requiring no R

SENSE

The MAX5938 provides a controlled turn-on for circuit

cards, which limits inrush current and prevents both

glitches on the power-supply rail and damage to board

connectors and components. Before startup, the

MAX5938 performs a Load Probe" test to detect the

presence of a short-circuit condition. If a short-circuit

condition does not exist, the device limits the inrush cur-

rent drawn by the load by gradually turning on the exter-

nal MOSFET. Once the external MOSFET is fully

enhanced, the MAX5938 provides overcurrent and short-

circuit protection by monitoring the voltage drop across

the R

DS(ON)

of the external power MOSFET. The

MAX5938 integrates a 400mA fast GATE pulldown to

guarantee that the external MOSFET is rapidly turned off

in the event of an overcurrent or short-circuit condition.

The MAX5938 also protects the system against input

voltage (V

) steps. During an input voltage step, the

device limits the current drawn by the load to a safe level

without shutting down the load. The device also includes

ON/OFF control, selectable PGOOD output polarity,

undervoltage (UV) and overvoltage (OV) protection.

The device offers latched (MAX5938L) or autoretry

(MAX5938A) fault management. Both the MAX5938A

and MAX5938L are available in a 16-pin QSOP package

and are specified for the extended (-40癈 to +85癈)

temperature range.

Applications

Servers

Telecom Line Cards

Network Switches

Solid-State Circuit Breakers

Network Routers

Features

f -10V to -80V Operation

f No External R

SENSE

Required

f Drives Large Power MOSFETS

f Eliminates Inrush Current Spikes During Hot Plug

into Powered Backplane

f Eliminates Inrush Current Spikes and Dropping of

Load During Large V

Steps

f Adjustable Circuit-Breaker Threshold with

Temperature Compensation

f Circuit-Breaker Fault with Transient Rejection

f Shorted Load Detection (Load Probe) Before

Power MOSFET Turn-On

f Programmable Load-Voltage Slew Rate Controls

Inrush Current

f ?/SPAN>2.4% Accuracy, Programmable Turn-On/Off

Voltage (UVLO)

f Overvoltage Fault Protection with Transient

Rejection

f Autoretry and Latched Fault Management

Available

f Low Quiescent Current (1mA)

-48V Hot-Swap Controller with V

Step Immunity,

No R

SENSE

, and Overvoltage Protection

________________________________________________________________ Maxim Integrated Products 1

19-3320; Rev 1; 1/05

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxims website at www.maxim-ic.com.

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX

AEEE

-40癈 to +85癈

16 QSOP

MAX5938LEEE

-40癈 to +85癈

16 QSOP

Typical Operating Circuit appears at end of data sheet.

GND

PGOOD

N.C.

OUT

N.C.

CB_ADJ

GATE

N.C.

TOP VIEW

MAX5938

QSOP

N.C.

OFF

STEP_MON

POL_SEL

Pin Configuration

Load Probe is a trademark of Maxim Integrated Products, Inc.

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