MAX4370 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – Current-Regulating Hot-Swap Controller with DualSpeed/BiLevel Fault Protection

19-1472; Rev 0; 4/99
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 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.
Applications
Hot Board Insertion
Solid-State Circuit Breaker
Features
o DualSpeed/BiLevel Protection During Normal
Operation
o Inrush Current Regulated at Start-Up
o Resides Either on the Backplane or on the
Removable Card
o Programmable Start-Up Period and Response
Time
o Allows Safe Board Insertion and Removal from
Live Backplane
o Protection for +3V to +12V Single Supplies
o Latched Off After Fault Condition
o Status Output Pin
o Internal Charge Pump Generates Gate Drive for
External N-Channel MOSFET
Ordering Information
PART
MAX4370ESA
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
8 SO
Pin Configuration appears at end of data sheet.
BACKPLANE REMOVABLE CARD
R_SENSE
M1
N
V_CC
STAT
GND
ON
V_IN
STAT
VSEN
GATE
ON
CSPD
C_SPD
MAX4370
GND
Typical Operating Circuit
V_OUT
C_BOARD
CTIM
C_TIM
DualSpeed/BiLevel is a trademark of Maxim Integrated Products.
†_{Patent Pending}
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