I created a project that is using a 328P to drive 24 LEDs (WS2812) which can draw 2A.
I used a guy to make a PCB layout (attached) and ordered an assembled version but something with the boost circuit is not working right. He used a LTC3872 (attached) to convert 3.7 to 5 but the circuit runs the battery down to 2.6 and then I get execution errors on the 328P. The LEDs are a very dynamic load so maybe the LTC3872 was a bad choice? Is there a chip that disconnects at 2.75 and then reconnects if the voltage is back to 3.7 (or some other threshold). The current circuit runs ok but simply does not protect the battery.
Schematics.pdf (1.13 MB)
3872fc-1267604.pdf (303 KB)