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Analog Devices Inc. LTC4287 Positive Hot Swap Controller is an integrated solution for hot-swap applications that allows a board to be safely inserted and removed from a live backplane. The dual-gate drivers and configurable multimode startup sequencing and operation optimize the metal-oxide semiconductor field-effect transistor (MOSFET) safe operating area (SOA) for various power levels. The circuit breaker timer limits the MOSFET temperature for reliable protection against overstress.
The SMBus 3.1 interface, PMBus command structure, and onboard analog-to-digital converters (ADCs) with selectable resolution and speed allow monitoring of board current, voltage, power, energy, temperature, and fault status. An optional external, electrically erasable programmable read-only memory (EEPROM) can be used for part configuration and provide BlackBox capturing of past fault conditions.
The Analog Devices Inc. LTC4287 has additional features to respond to input under voltages and over voltages, to interrupt the host when a fault has occurred, to notify when the output power is good, to detect insertion of a board, to turn off the MOSFET if an external supply monitor fails to indicate power-good within a timeout period, and to auto reboot after a programmable delay following a host commanded turn-off.
