This is somewhat a duplicate.
I'm looking for a way to limit the inrush current of a small supercapacitor circuit. Input is regulated 5V (USB), output feeds a 3.3V regulator. Goal is a 10s runtime at 100mA, so the supercap is 5V, around 500mF if my math are correct.
The simplest inrush limiter is well presented in the question above, but I'd like to find something that charges the supercap faster, without loosing the ability to charge it to (almost) the supply voltage. Something like constant current, around 300mA.
- expensive and
- designed to handle and equalize two 2.5/2.7V supercap, which isn't warranted given the large availability of 5V supercaps.
What's the intermediate solution?
The system isn't battery powered, so efficiency is not a major consideration.