I want to run a 2G Modem HL6528RD. I provide it with 3.6 V, got from the following circuit :
I finally manage to make it work but the problem is that if R108 is mounted, the modem doesn’t work, (the modem's power supply drops by 1V due to current peaks of up to 2A and causes the modem to restart).
However, if I replace R108 by an inductor with high enough value (2.2uH for exemple), the voltage hardly changes when current peaks occur.
Could someone explain to me, what is causing this phenomenon?
Thanks for reading my question