Hello,
We have a non standard battery charger solution: 2 chargers because we have 2 USB connectors. Each battery charger is sourced by a different USB port. Battery is commun for both chargers.
We have 2 issues:
1) Battery sometimes goes as high as 4.4V (We are sure that the software sets the registers to 4.2V battery charge). This voltage stays for a couple of minutes. Sometimes, the battery goes in overvoltage safety mode and switches OFF.
2) When in voltage regulation, we see some instability on the battery voltage at a frequency between 3 and 4 KHz
Attached is our schematic.
Any idea ?
