I'm having a hard time trying to find any examples of charging a supercap from a boost converter architecture. I need to be able to charge a few farads of supercap to 20V, from a battery power source which is nominally 6V, so I was looking at using a boost converter running in constant-current, with some means of then shutting off when the required voltage is reached. In this application one side of the supercap is permanently wired to ground, so this will necessitate high-side current sensing. The charging current is relatively low, at around 100mA. I've had a play around in LTspice with some regular LT boost converters, and unfortunately it all starts to get a bit messy right away, eg. the high-side sensing requirement makes it difficult to derive the feedback, which then initially massively over-shoots due to the boost topology etc. If anyone has done something similar, or has any advice on parts or better suited topologies (eg. buck-boost, or SEPIC?) then that would be great to hear about. Thanks!