Good morning,
We have been using the BQ25895 in an application for a while. There are new changes that will generate higher current demands, so we are reviewing the power architecture. Unfortunately, with the current the new demands will exceed the 6A continuous maximum and could potentially see frequent spikes above the 9A (1s peak) limit. Therefore we are looking to see how we could modify the architecture to respect the limits of the BQ (ideally avoid changing the IC as that will have a big impact on the SW development).
For a bit more background information, the product is non-operable while in charge. When disconnected, we discharge the battery to operate the device until the user either shuts off the product or we fall into a low battery state and shut down.
1) Does the PMID boost current (max 3.1A) contribute to the overall BATFET current (OCP 9A min)? If not, this would allow us to split some of the current on the PMID rail instead of loading the VSYS rail. However, it seems that all battery current must pass by the internal BATFET, so seems unlikely it wouldn't contribute to the overall current.
2) Is there any way to increase the overall current through BATFET? Ideally without changing IC but if there is a similar one from a SW perspective, we might be open to that.
3) Do you have a maximum specification for the BATFET OCP (maximum current guaranteed to cause an overcurrent)? I tested the EVK with a loads on VSYS and PMID that should have exceeded the 9A min to see if the PMID current would be included in the overall BATFET current, however it didn't trigger an OCP. I then did a single load on VSYS to better control the battery discharge current, up to 10A while monitoring the IC temperature, without being able to trigger a OCP.
Best regards,
