/diy/ - Do It Yourself

>>1401966
some power-path manager ICs share the switching inductor between charging and discharging, and therefore can't do both at the same time. some battery banks just refuse to because fuck you I'm not a UPS and you're not my real dad
what you need is something (conceptually) other than a USB power bank. I've successfully used the bq24195 IC followed by a boost converter to serve as a UPS-like battery backup system. if you'd rather not have a microcontroller around to set up the bq24195 away from its conservative default settings, there's also the MCP73871 that is truly standalone. in either case, enjoy your 0.5mm QFNs with exposed pad