After a few hours of Google, I finally found a useful reference for a "ups style" charger circuit for li ion batteries.
https://blog.zakkemble.net/a-lithium-battery-charger-with-load-sharing/
However, the IC specified has 2 problems for my application
-output to system load maxes out at 1A; I need 3.
-marketed solely for single cell batteries. Not clear on exactly what is meant by this. What would happen if I connected 4 cells in parallel to battery out?
Application note for IC;
http://ww1.microchip.com/downloads/en/AppNotes/01149c.pdf
Many thanks in advance
Joe
https://blog.zakkemble.net/a-lithium-battery-charger-with-load-sharing/
However, the IC specified has 2 problems for my application
-output to system load maxes out at 1A; I need 3.
-marketed solely for single cell batteries. Not clear on exactly what is meant by this. What would happen if I connected 4 cells in parallel to battery out?
Application note for IC;
http://ww1.microchip.com/downloads/en/AppNotes/01149c.pdf
Many thanks in advance
Joe