ESP_Sprite wrote: ↑

Wed May 08, 2019 6:03 am

An USB lead isn't always the best for high loads... can you try to see if moving the 220uF capacitor to the input side of the SMPS makes a difference?

Make sense. I will try it and update the problem later.

WiFive wrote: ↑

Wed May 08, 2019 7:28 am

Also LTC4067 has a current limiting function

Yes, I know. But I set it to 2A, the maximum.

Thank for your reply :] The 22uF capacitor I used was a 0805/10V X7R SMD unpolarized capacitor. The 3.3V wires are 20mil width and 1oz thick. (Okay, I just noticed a narrow wire near the capacitor of power pins. Will there be any significant influence?) Screen Shot 2019-05-08 at 12.40.59 PM.png In t...

I used STBB1-APUR in my project, which is a switch-mode buck-boost power supply IC with 1A (peak 2.3A @ 3.3V) output capability. I used it to stabilize the voltage from Li-ion battery to 3.3V, and the 3.3V output is directly connected to the ESP32 power supply pins. But my ESP32 suffers from power b...