max4370

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

VIN to GND...........................................................................+15V
STAT to GND............................................................-0.3V to +14V
GATE to GND...................................................-0.3V to (V_IN+ 8.5V)
ON to GND (Note 1)....................................................-1V to +14V
CSPD to GND................-0.3V to the lower of (V_IN+ 0.3V) or +12V
VSEN, CTIM to GND.........................................-0.3V to (V_IN+ 0.3V)
Current into ON.....................................................................±2mA

Current into Any Other Pin...................................................±50mA
Continuous Power Dissipation (T_A = +70°C)
SO (derate 5.9mW/°C above +70°C).................................471mW
Operating Temperature Range..............................-40°C to +85°C
Storage Temperature Range.......................... .....-65°C to +150°C
Lead Temperature (soldering, 10sec).................................+300°C

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 start- up 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 MOS- FET 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.