MAX4370ESA Current-Regulating Hot-Swap Controller with DualSpeed/BiLevel Fault Protection

General Description

The MAX4370 is a circuit-breaker IC designed to offer

protection in hot-swap applications using Maxim’s

DualSpeed/BiLevel™ detection. This controller,

designed to reside either on the backplane or on the

removable card, is used to protect a system from startup

damage when a card or board is inserted into a rack

with the main system power supply turned on. The

card’s discharged filter capacitors provide a low

impedance that can momentarily cause the main power

supply to collapse. The MAX4370 prevents this start-up

condition by providing inrush current regulation during

a programmable start-up period, allowing the system to

stabilize safely. In addition, two on-chip comparators

provide DualSpeed/BiLevel short-circuit protection and

overcurrent protection during normal operation.

The MAX4370 provides protection for a +3V to +12V

single supply. An internal charge pump generates the

controlled gate drive for an external N-channel MOSFET

power switch. The MAX4370 latches the switch off

after a fault condition until an external reset signal

clears the device. Other features include a status pin to

indicate a fault condition, an adjustable overcurrent

response time, and a power-on reset comparator.

The MAX4370 is specified for the extended-industrial

temperature range (-40°C to +85°C) and is available in

an 8-pin SO package.

Applications

Hot Board Insertion

Solid-State Circuit Breaker

Features

© DualSpeed/BiLevel Protection During Normal

Operation

© Inrush Current Regulated at Start-Up

© Resides Either on the Backplane or on the

Removable Card

© Programmable Start-Up Period and Response

Time

© Allows Safe Board Insertion and Removal from

Live Backplane

© Protection for +3V to +12V Single Supplies

© Latched Off After Fault Condition

© Status Output Pin

© Internal Charge Pump Generates Gate Drive for

External N-Channel MOSFET

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