BQ25720: Input capacitor select

Che Wen Yeh

Part Number: BQ25720

Tool/software:

Hi,

Please advise on the input capacitor design for a 100W input (20V/5A).

If not using POSCAP and only using 10μF 25V X5R MLCCs, how many pieces are needed? Thanks.

0 Christian Moyer 5 months ago

Hello Che Wen Yeh,

Best Regards,

Christian.

0 Che Wen Yeh 5 months ago in reply to Christian Moyer

Hi Christian,

Yes, I am using this checklist for verification.

So, when the input exceeds 90W, is it required to place a 33μF POSCAP? Thanks.

0 Christian Moyer 5 months ago in reply to Che Wen Yeh

Hello ,

I'm looking into this question, and will provide an update after I gather more information.

Best Regards,

Christian

0 Christian Moyer 5 months ago in reply to Christian Moyer

Hello Che Wen Yeh,

Che Wen Yeh said:
So, when the input exceeds 90W, is it required to place a 33μF POSCAP? Thanks.

Yes, Its recommened to use at least (9x) 10 uF ceramic capacitors and at least (2x) 33 uF tantalum polymer capacitors.

Best Regards,

Christian.

Power management forum