2:1 power mux for dual-supply handoff
The TPS2115APW is a source selector switch from Texas Instruments that routes one of two input supplies to a single output, controlled by a logic pin. It integrates an N-channel FET per input, so no external pass transistor is needed. The 2:1 input-to-output ratio means the part selects between two power rails — typical in handheld and mobile devices where a battery and a USB or adapter supply share the load. The 1.25 A continuous output ceiling suits moderate-load peripherals, sensors, and radio modules that draw under 1 A steady-state.
55 µA quiescent — always-on budget matters
The 55 µA supply current is the current the selector itself burns while active. The 1 ms turn-on delay and 5 ms turn-off delay prevent glitches during supply transitions, which is useful when the switchover happens under load.