I have a project that runs off a 4S LIPO battery and I want to switch to 24V wall power when I plug in an DC wall adapter. I have two designs, an inexpensive one with discretes and one with an expensive LTC4412HV IC.
I simulated both and they seem to work fine. In terms of safety since the battery is a LIPO, is the discrete design okay? Is there anything I should add other than a fuse which I already have?
Edit: The reason I use a PFET instead of a schottky diode is because the diode consumes too much power and I want to maximize battery life.
Answer
The discrete design exactly mirrors Microchip's AN1149, "Design A Load Sharing System Power Path Management with Microchip's Stand-Alone Li-Ion Battery Charger". The only difference is that your design does not include battery charging capability or multiple external inputs.
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