MSPM0G1505: Backup power for RTC

Hi, 

Quote:

For a solid-state solution, you can just stick a diode in line with each power source and connect them together. The only real downside is that you waste a bit of power because of the diode's forward voltage drop. 
See e.g. https://www.eetimes.com/document.asp?doc_id=1273175&page_number=2

There are also cheap power management ICs that use MOSFETs to achieve the same thing without a significant voltage drop.

Original link: https://www.reddit.com/r/AskElectronics/comments/88x1vs/made_a_circuit_that_switches_between_mains_power/?rdt=62738

Regards,

Helic

Thanks for your answer,

I found an IC that implements a similar suggested oring. Would you have a special recommendation if i was to use a supercap as backup source?

Regards

Hi, Francisco

I don’t know much about this part.

But you can compare and choose these two back up power from: rechargeability, battery size, cost, peak current and power.

Regards,

Helic