Hi
The customer design with BQ25720, CELL_ BATPRESZ is set 2 batteries. The device is not connected to the battery and only powered by VBUS. They use default parameters.
VBUS_IN connect 3.5V(current limit 4A), power on the system, there is a 1.7A plus current, VSYS drop from 6.6V to 3.8V, and lasts about 180ms, then recover 6.6V.
VBUS_IN connect 5V(current limit 4A), power on the system, there is a 3.2A plus current, VSYS drop 0.5V, and lasts about 100us.
Attached the schematic and waveform.
Why the VSYS will drop?
Waiting for your reply.
Thanks
Star
