Hot swap controller with I²C telemetry — what it does and where it fits
The Analog Devices ADM1175-2ARMZ-R7 is a single-channel hot swap controller and current/voltage monitor that lets you safely insert and remove a circuit board from a live backplane without glitching the shared supply rail. It integrates an I²C-accessible ADC that reads the voltage across an external sense resistor and the supply rail itself, so the system host can track inrush current, load current, and bus voltage in real time. The controller drives an external N-channel MOSFET — there is no internal pass element — which means the current rating and Rds(on) are set by the designer's choice of FET. Programmable features include the current limit threshold (set by the sense resistor value), a fault timeout period, and the turn-on voltage for the UVLO pin. The latched fault behaviour means the controller shuts off and stays off after an overcurrent event until the input is cycled or the ON pin is toggled — no auto-retry, which is the right choice for applications where a persistent fault should not cause repeated power cycling. The supply range of 3.15 V to 16.5 V covers common backplane voltages. Quiescent current is 1.7 mA.
Package and footprint notes
The ADM1175-2ARMZ-R7 comes in a 10-lead MSOP package with a 0.118-inch body width and 3.00 mm body length. The 10-MSOP footprint is shared with the ADM1176 and ADM1177 family variants, so a board layout can accommodate any of the three with a single BOM option change.