Hi,
Customer has questions below, please check. Thanks.
1. Do you have structure diagram for the NMOS in PCA9306? And Rds value between Vref1 and Vref2?
2. Design use LDO=1.8V and found the VCC1 can't regulate issue. To follow the datasheet calculate Rpulldown=300kohm{1.8/(3.3-1.8-0.6)*200K*0.75}, but VCC1 still up to 1.92v, try to put 100kohm then the Vout=1.8V, any concern to use 100kohm?