We may want to use a different charger since this part is failing EMC testing, even after a re-spin with modified layout and stackup. We are testing some additional mitigations from https://e2e.ti.com/support/power-management/f/196/t/944636. It is very disappointing to learn that the "reference" layout was not designed to minimize EMI. The EVK is extremely noisy.
My question is: Is it possible to use the BQ24172 only to switch between a 12VDC supply (AVCC) and VBAT, without using it for battery charging? And without interfering with another charging IC (simple NiMH charger).
If this is possible, I have several other questions:
- What are the minimal components required for this?
- Can we omit the switching inductor?
- Do we need to keep the connection to FB pin?
- Can we implement this just by holding ISET low?
If this is not possible, does TI have a recommended part for switching between 12VDC and 7.2V VBAT for uninterrupted system power supply?
Thanks,
Jackson
