BQ25303J: Should the output cap close to inductor or pin 10 (BAT)

Alex Lee

Prodigy 190 points

Part Number: BQ25303J

Tool/software:

Hello

I'm confused that what is the best placement for the output capacitor C3.

Should it be placed close to the inductor and VBAT pad like PIC A?

close to the Pin 10(BAT) of BQ25303J PIC B?

Thank you!

over 1 year ago

0 Ning T over 1 year ago

TI__Guru 57781 points

Hi,

PIC B is similar to the EVM design. Please visit https://www.ti.com/lit/ug/sluuc53a/sluuc53a.pdf for the details.

Thanks,

Ning.

0 Alex Lee over 1 year ago in reply to Ning T

Prodigy 190 points

Hello Ning

Thank you. I've read the EVM design before posting. There are fews cap, some of them are close to the inductor and some is close to pin BAT, that's why I'm confused if I just use one cap. If it's for filtering, should it be close to inductor (PIC A)?

Thanks for your help.

0 Ning T over 1 year ago in reply to Alex Lee

TI__Guru 57781 points

Hi,

Referring to the d/s, Battery voltage sensing input. Connect this pin to the positive terminal of the battery pack and the node of inductor output terminal. 10-µF capacitor is recommended to connect to this pin.

Thanks,

Ning

0 Alex Lee over 1 year ago in reply to Ning T

Prodigy 190 points

Hi Ning

Thank you for your prompt reply. the datasheet is something making confused as well. The suggest layout is placeing this cap close to the inductor instead of BAT pin.