ADM1172 Datasheet PDF | Analog Devices

Analog Devices ADM1172

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. When an overcurrent condition is detected, the gate voltage of the FET is reduced to limit the current flowing through the sense resistor.

Part No.	ADM1172
Datasheet	ADM1172 Download
Manufacturer	Analog Devices
Description	Hot Swap Controller
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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

GENERAL DESCRIPTION

An internal charge pump is used to enhance the gate of the N-channel FET. During an overcurrent condition, the TIMER pin capacitor determines the amount of time the FET remains at a current limiting mode of operation until it is shut down. The ON (ON-CLR) pin is the enable input for the device and can be used to monitor the input supply voltage. The ADM1172 operates with a supply voltage ranging from 2.7 V to 16.5 V. The ADM1172 also features a power-fail comparator.