GENERAL DESCRIPTION

The ADM1172 is a hot swap controller that safely enables a printed circuit board to be removed and inserted to a live backplane. This is achieved using an external N-channel power MOSFET with a current control loop that monitors the load current through a sense resistor. An internal charge pump is used to enhance the gate of the N-channel FET. When an overcurrent condition is detected, the gate voltage of the FET is reduced to limit the current flowing through the sense resistor.

FEATURES

Controls supply rails from 2.7 V to 16.5 V

Allows protected board removal and insertion to a live

backplane

External sense resistor provides adjustable analog current

limit with circuit breaker

Peak fault current limited with fast response

Charge pumped gate drive for external N-FET switch

Power-fail comparator

Automatic retry or latch-off during current fault

Undervoltage lockout

8-lead, TSOT package

APPLICATIONS

Hot swap board insertion: line cards, raid systems

Industrial high-side switches/circuit breakers

Electronic circuit breakers