DESCRIPTION
Demonstration circuit DC1717B uses the LTC®4417 to
arbitrate between three input supply rails, selecting the
highest priority, valid supply to power the load. The rail’s
priority is defined by the input connection (V1-V3). Each
rail has overvoltage and undervoltage thresholds set by
external resistors. If the highest priority rail voltage falls
out of the defined window (overvoltage or undervoltage),
the rail with the next highest priority, which is valid, is
enabled and powers the load. Two or more LTC4417s
can be cascaded to provide switchover between more
than three rails.