MAX5920 Maxim, MAX5920 Datasheet

MAX5920

Manufacturer Part Number

MAX5920

Description

-48V Hot-Swap Controller with External RSENSE

Manufacturer

Maxim

Datasheet

1.MAX5920.pdf (18 pages)

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The MAX5920A/MAX5920B are hot-swap controllers that

allow a circuit card to be safely hot plugged into a live

backplane. The MAX5920A/MAX5920B operate from

-20V to -80V and are well-suited for -48V power systems.

These devices are pin and function compatible with the

LT4250 and pin compatible with the LT1640.

The MAX5920A/MAX5920B provide a controlled turn-on

to circuit cards preventing glitches on the power-supply

rail and damage to board connectors and components.

The MAX5920A/MAX5920B provide undervoltage, over-

voltage, and overcurrent protection. These devices

ensure the input voltage is stable and within tolerance

before applying power to the load.

Both the MAX5920A and MAX5920B protect a system

against overcurrent and short-circuit conditions by turn-

ing off the external MOSFET in the event of a fault con-

dition. The MAX5920A/MAX5920B also provide

protection against input voltage steps. During an input

voltage step, the MAX5920A/MAX5920B limit the cur-

rent drawn by the load to a safe level without turning off

power to the load.

Both devices feature an open-drain power-good status

output (PWRGD for the MAX5920A or PWRGD for the

MAX5920B) that can be used to enable downstream

converters. A built-in thermal-shutdown feature is also

included to protect the external MOSFET in case of

overheating.

The MAX5920A/MAX5920B are available in an 8-pin SO

package. Both devices are specified for the extended

-40°C to +85°C temperature range.

19-2931; Rev 0; 8/03

Typical Operating Circuit and Selector Guide appear at end

of data sheet.

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

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Telecom Line Cards

Network Switches/Routers

Central-Office Line Cards

Server Line Cards

Base-Station Line Cards

________________________________________________________________ Maxim Integrated Products

General Description

Applications

-48V Hot-Swap Controller

o Allows Safe Board Insertion and Removal

o Pin- and Function-Compatible with LT4250L

o Pin-Compatible with LT1640L (MAX5920A)

o Pin- and Function-Compatible with LT4250H

o Pin-Compatible with LT1640H (MAX5920B)

o Circuit-Breaker Immunity to Input Voltage Steps

o Withstands -100V Input Transients with No

o Programmable Inrush and Short-Circuit Current

o Operates from -20V to -80V

o Programmable Overvoltage Protection

o Programmable Undervoltage Lockout

o Powers Up into a Shorted Load

o Power-Good Control Output

o Thermal Shutdown Protects External MOSFET

MAX5920AESA

MAX5920BESA

from a Live -48V Backplane

(MAX5920A)

(MAX5920B)

and Current Spikes

External Components

Limits

with External R

TOP VIEW

PART

(PWRGD)

( ) FOR MAX5920B.

PWRGD

-40°C to +85°C

TEMP RANGE

Ordering Information

MAX5920A

MAX5920B

Pin Configuration

DRAIN

GATE

SENSE

PIN-PACKAGE

8 SO

SENSE

Features

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