To select an appropriate power supply for the MAX40109, please provide the frequency characteristics of its PSRR.
Although the datasheet mentions a typical PSRR of 105dB, it does not specify the corresponding frequency.
This information is necessary to evaluate the ripple frequency and tolerance of the power supply used with the MAX40109, as well as to determine the required specifications for VDDHV when using a switching power supply.
Best Regards,