Hi Biff,
So the USB-C connector would be the input source for the IC and also be an output for the battery? This conflicts with what you say by “can we then also use the same connector to connect a standard power source” as this would now be an input not an output. That is where I am confused. The scenario 3 drawing looks identical in use case to scenario 2 to me. You could certainly use any type of USB power to charge a battery, even with a battery IC charger.
Scenario 1 is where I would be most concerned about. You would need to regulate separately from the input to the USB-C power bank, the battery charger will not have 3 outputs just 2 (SYS output and Battery).
The power path on this device allows you to output both to the system and to the battery at the same time. It would also allow the battery to output to the system. It controls where the power heads in the system. If you wanted to connect multiple inputs to the device, you could either diode OR the inputs or you could make sure the USB-C connector you choose allows a non-usb 40V signal to pass through. The IC would then regulate for the charge voltage you need.
We may need a 2 stage solution to drop the 40V down to a more reasonable voltage for our battery charger IC. Doing so would allow us to recommend a different battery charger as well. Can you tell me the specs of your battery?
Thanks,
Brendan