I'm trying to figure out the best way to implement a UPS for an embedded system that runs from a 5V supply.
Essentially the system has a 48v to 5v, 1.2A output DCDC converter that powers my system. The 5v output supplies a bank of relays, as well as a 3.3v regulator for the embedded side of things.
When the input power fails I need to be able to keep the system alive (both 5V and 3.3V rails) for about an hour or so, and I figured the best way to do this would be with a lithium cell charger, and and boost converter. The average current of the system is around about 200mA so I know a single 18650 Lithium cell should more than suffice.
To reduce design time and complexity I hoped to find a highly integrated one-chip solution for this, but I'm unsure if it exists. If it doesn't, I don't know what my other options are either. I figured this is essentially most power banks do, so surely there must be a simplistic solution out there somewhere... I just don't know what to be searching for other than "lithium battery charger boost 5v"
Can anyone with some experience in this area please point me in right direction?