I want to create a power switch (on/off) for a hot-swap plug-in module that connects to my (future) PCB.
Got a MCU on board and a single 3.3V supply, fed from AA batteries with through a DC/DC, this is the supply VCC I also want to switch to the plug-in module. I went with a P-channel MOSFET so I can do high-side switching ('cutting' the VCC instead of the return ground to the module).
Question is: which P-MOSFET I should choose that will allow working with such a low voltage on the Vgs side? and also - will I need a BJT for 'pushing' the gate or I can connect the gate of the PMOS directly to the MCU logic IO pins?
Notes: 1. I am on a budget since this card will be going to mass-production so I need the lowest component count possible + cheapest & smallest possible parts. 2. I won't be needing more than 200mA fed to the plug-in module.
Your help is much appreciated. Thanks