Im designing battery powered application and need reverse polarity protection.
My system specs: 4.5v(3x AA batteries) in and system running on 3.3v. Im using MCP1711T-33I/OT LDO to convert 4.5v to 3.3v. My system will take about 50 milliamps maximum. Therefore i can't obviously use any diodes since voltage drop and power waste will be too big. I read some threads and people tend to suggest P-channel MOSFET. I was looking for low rds(on) MOSFETS and all their packages seem so huge. Like this one:
Size isn't too big problem though(sot23 package would be perfect though). Can you suggest me anything else than P-channel MOSFET? If not, can you suggest me some decent P-channel MOSFET for my needs? Thanks in advance.