Found something interesting in RT6154 datasheet (the buck-boost SMPS used on both PicoW and Pico2W).
Look at the spike of current (I in) when it starts. Maybe that's what knocks out TPL5110 if not limited.
I've tested with 3V3_EN (PS on RT6154), and the drop of VSYS happens every time it starts.
Looks like it's a soft start on output but a hard one on input.
Look at the spike of current (I in) when it starts. Maybe that's what knocks out TPL5110 if not limited.
I've tested with 3V3_EN (PS on RT6154), and the drop of VSYS happens every time it starts.
Looks like it's a soft start on output but a hard one on input.
Statistics: Posted by gmx — Mon Dec 22, 2025 12:13 am