What this eFuse does on the board
The Toshiba TCKE805NA,RF is an electronic fuse (eFuse) IC that protects downstream circuitry from overcurrent and overvoltage faults. It sits between a 4.4V to 18V supply rail and a load rated up to 5A, acting as a resettable circuit breaker with a built-in charge pump and power FET. When a fault clears, the auto-retry function reconnects the load automatically — no manual reset or power cycle needed. That is handy in remote or inaccessible equipment where a hard latch-off would mean a site visit.