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Using a gain of 100V/V, the input measurement range is 33mV for a 3.3V output. Using a 6mR sense resistor, the current measurement range is 5.5A , which at 600mV/A. This is above the maximum current in the power budget of 3.5A with some margin.
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Enables dual powering of loads, where if the primary supply (V1) is no longer available (voltage not within specified OV/UV range for a certain amount of time), it will switch automatically to a secondary supply.
Shutdown
Shutting down the power path ICs provides the ability to fully de-power the vehicle. The shutdown pin of both ICs are tied together and connected to the switch on the dash.
Inrush
LTC4418 minimized startup inrush by soft starting the gate drive of the first input to connect the output. However, during supply switchover excessive inrush due to the voltage difference between the 2 supplies can lead to undesirable UV fault.
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