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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.
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
PMIC - 热插拔控制器
Maxim Integrated
热交换控制器
1
闭锁故障,OVP,UVLO
断路器,限流,故障超时
2.7V ~ 13.2V
600μA
8-SOIC(0.154",3.90mm 宽)