The LTC4236IUFD-2#PBF is a dual ideal diode-OR and single hot swap controller with current monitor in 28 pin QFN package. It offers ideal diode-OR and hot swap functions for two power rails by controlling external N-channel MOSFETs. MOSFETs acting as ideal diodes replace two high power schottky diodes and associated heat sinks which save power and board area. The supply output is protected against short circuit faults with a fast acting foldback current limit and electronic circuit breaker. The LTC4236 regulates the forward voltage drop across ideal diode MOSFETs to ensure smooth current transfer from one supply to other without oscillation. The ideal diode MOSFETs turn on quickly to reduce load voltage droop during supply switchover. If input supply fails or is shorted, a fast turn-off minimizes reverse current transients. A current sense amplifier translates the voltage across sense resistor to a ground referenced signal.
Automatic retry after fault
2.9V to 18V operating range and 2.7mA input supply current
Enables safe board insertion into a live backplane by limiting inrush current
Current monitor output, controls N-channel MOSFETs
Limits peak fault current in less than or equal to 1µs and adjustable current limit with foldback
Adjustable start-up and current limit fault delay
0.5µs ideal diode turn-on and turn-off time
Smooth switchover without oscillation and adjustable start-up delay
Diode status outputs, turn-on/off control, reports fault & power good status
