Power Noise Issue with nPM1300 During USB-C Connection/Disconnection

RE: Power Noise Issue with nPM1300 During USB-C Connection/Disconnection

Tomi Koskela — Mon, 28 Apr 2025 09:21:46 GMT

Hello,

Are the button nets floating if button is not pressed? If they are, then this might be the reason. There should be some kind of pull-up in these signals to set then in a known state when button is not pressed.

RE: Power Noise Issue with nPM1300 During USB-C Connection/Disconnection

loic — Fri, 25 Apr 2025 14:32:12 GMT

Hi,

I am not expert at reading PCB drawings, however, it seems your buttons connections are passing (in red ) below the switching part of nPM1300 (PVSS, PVDD, SW pins) that might be the reason. Can you send some more readable shots of the PCB layers?
Also, what are the buttons nets connected to? if these nets are high impedance when button not pressed, then maybe they are acting as antennas and get perturbated by switching activity?

Loic

RE: Power Noise Issue with nPM1300 During USB-C Connection/Disconnection

ozoz05 — Wed, 16 Apr 2025 07:38:50 GMT

L3 구성 요소를 CIGT201610EH2R2MNE에서 WIP201610S-2R2MLDG로 교체한 후 잡음이 크게 감소했습니다.

그러나 교체 후에도 때때로 노이즈가 계속 발생하고 의도하지 않은 신호가 버튼 측에 등록되는 경우가 있습니다.