I'm a new product designer trying to learn electrical engineering on my own.
I have a circuit that I need to control the power to a set of periphery circuit segments including a display, SD card, and a series of four i²c haptic driver segments, etc... all running from 3.3V on a single Li-ion cell.
Here are the specs: Vbat 3.0 - 4.2V Ipulse 5A (Power on inrush) Imax 2 (max continuous) Inorm 250mA (normal operation)
In my limited experience it seems very difficult to find switching with no voltage drop especially and even harder to find a logic level switching solution with acceptable current capacity. The best I could find was this MOSFET that appears to have a Vsd of 1v at Vgs(on). That would still leave me with ~2.3v, a volt below the min(and max). How do devices normally handle this issue? I'm beginning to think I need to bite the bullet and do a deep dive learning DC-DC boost converters, but I hate to add more power loss, more components, high frequency noise, and inefficiencies into the mix. Oh and my oscilloscope is questionably useful at best.
Short of a relay, are there any good options for switching the load with no realized voltage loss, or is the right thing going to be a DC-DC buck boost segment?