ADM1172 Series

2.7 V to 16.5 V Hot Swap Controller with Power-Fail Comparator

Catalog

2.7 V to 16.5 V Hot Swap Controller with Power-Fail Comparator

Part	Supplier Device Package	Voltage - Supply [Max]	Voltage - Supply [Min]	Type	Operating Temperature [Max]	Operating Temperature [Min]	Programmable Features	Number of Channels	Current - Supply	Package / Case	Applications	Mounting Type	Internal Switch(s)	Features
Analog Devices ADM1172-2AUJZ-RL7	TSOT-23-8	16.5 V	2.7 V	Hot Swap Controller	85 °C	-40 °C	Current Limit Fault Timeout Turn On Voltage	1	650 µA	SOT-23-8 Thin TSOT-23-8	General Purpose	Surface Mount		Latched Fault UVLO

Catalog

2.7 V to 16.5 V Hot Swap Controller with Power-Fail Comparator

Key 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

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. 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. The voltage on the PFI pin is compared with an internal 0.6 V reference, and the output of this comparator is presented on the PFO pin. This device is available in two options: the ADM1172-1 with automatic retry for overcurrent fault and the ADM1172-2 with latch-off for an overcurrent fault. Toggling the ON (ON-CLR) pin resets a latched fault. The ADM1172 is packaged in an 8-lead TSOT.ApplicationsHot swap board insertion: line cards, raid systemsIndustrial high-side switches/circuit breakersElectronic circuit breakers