Tool/software:
Hi team,
I am planning to use bq76200 to manage a two Li-Ion cell battery (4,35*2 Volts at full charge) and I am in the process of selecting the N-Mosfets to implement the charge, discharge and pack isolation.
The datasheet indicates on page 5 that:
V(CHGFETON) can go from 9V to 14V, I imagine with respect to GND.
V(DSGFETON) can go from 9V to 14V, I imagine with respect to GND.
So my doubt is regarding the Vgs (Max) parameter of the Mosfets:
For the CHG Mosfet my highest Vgs would be (14V - Lowest battery voltage)
For the DSG Mosfet my highest Vgs would be (14V – Lowest charging voltage)
Even though this would compromise the battery, the lowest battery voltage could be 0V and in case of a charger failure the lowest charging voltage could be 0V too.
This would mean that in order to not damage the mosfets, their Vgs(max) should be over 14?
The test condition in the datasheet states for V(VDDCP), V(CHGFETON) and V(DSGFETON) the remark “V(VDDCP) – V(BAT)”, so it makes me doubt if the datasheet voltages are referenced on GND or on V(BAT).
We appreciate your input in advance. Thank you!
Randy
