I am looking for an IC that can do active power management (most important function is load switch from the battery to the external supply), and can allow a battery charge rate of 50mA for a 4.1V LiIon (thus Vbatt charge threshold needs to be 4.1V). Plus have a system Vout of less than 5V, preferably 4.5V or less.
I have had a look at all various versions in the BQ series that have Active Power Management, but just could not find anything that suits (in particular none of these allows a 50mA charge rate).
Is there something I missed? In case the answer is No, are any of the relevant ones in the BQ series customisable? For example the BQ24072 would be perfect, but regulates Vbatt only at 4.2V (and not 4.1V) and it looks it doesn't allow a charge rate lower than 90 to 100mA (for USB mode only).
Other potentially suitable ICs would be BQ24031 or BQ24079 but: is the Vout reg customisable to 4.4V, and can any of them work with 50mA batt charge current, etc.
In case that the answers above are all No, the first feature to drop would be the Active Power Management feature: in this case I found only one IC in the BQ series that looks it should work down to 50mA battery charge rate, which is BQ24060 (at least from the characterisation plots it should - see Fig 8 for "Low Charge Rate" and 10, but not from the specs, which specify the minimum charge rate as 100mA) and given that it has a separate Bat input, one could use a resistive divider there to change the batt recharge voltage from 4.2 to 4.1? Again, is the 50mA charge rate correct (as shown in the plots), and could I use a resistive divider to set the Vbat at 4.1V?
Sorry for the long message but this exercise turned out to be quite frustrating (and long), and I need a solution quite fast.
Regards,
Edmond