Hi
I see that charger chips like the BQ24272 have the PMID
pin but it's not recommended to be connected to an external load.
However, BQ24295 has a PMID
pin as well but it's designed to boost the voltage for an external load. That said, it seems that it's active only when VBUS
is inactive (8.3.1.3) - or is it? Does that mean PMID
is inactive during charge mode?
But looking at the block diagram, it looks like VBUS
passes current to PMID
.
If the device is to pull current regardless of the state of VBUS
, how should it be hooked up? It'd be in vain if it's connected to PMID
alone (similar to the example circuit) as there'd be no power when the input source is present. Isn't the load usually connected to SYS
? They call SYS
the 'system connection point' whilst PMID
the 'battery boost mode output voltage'.
In fact, what does PMID
actually stand for?
Thanks