Tool/software:
Hello all,
We're looking to use the BQ79616-Q1 in an application where power draw is a consideration. Given the nature of LDOIN typically being driven from the top of the battery stack, this provides very low efficiency at ~10%. At 64V for a fully charged stack, expected power dissipation would be around 0.7W per IC, so for a 96s pack this would be a load of 4.2W.
So we are looking to use an external step-down regulator in our design. One area of concern we have with this approach is the stated requirements regarding the voltage on the BAT pin:
The datasheet also specifies the current drawn by the BAT pin, I_BAT, to be 150uA while active which is acceptable in our design.
Would we be able to power BAT off the top of the battery stack, and then separately use a switching regulator to supply LDOIN the appropriate voltage? In this way, the BAT pin voltage specification is still being followed with only a minimal hit to efficiency.
