Power ManagementのトピックRe: PF5020 Open Drain Outputs

PF5020 Open Drain Outputs

ThorVic — Wed, 04 Jan 2023 18:47:54 GMT

Hello,

I just want to know if the PF5020 is safe to pull up the OD outputs (PGOOD, PGOODx, INTB) to a 5V source with 100k. I checked the datasheet and it says it can be pulled up to the VDDIO and the VDDIO is a voltage rail of either 1.8V or 3.3V.

The datasheet mentioned that these OD outputs have max 6V so I think it should be OK since it is open drain but I am just wondering if there is any internal weak pull ups connected to VDDIO that wasn't mentioned in the datasheet.

Thanks.

Re: PF5020 Open Drain Outputs

diazmarin09 — Wed, 04 Jan 2023 20:06:41 GMT

Hello Thor,

I hope all is great with you. Thank you for using the NXP communities.

Will you supply the device with 5V as well? I mean, the main input supply will be 5V?

I hope this information helps.

Regards,

David

Re: PF5020 Open Drain Outputs

ThorVic — Wed, 04 Jan 2023 20:08:26 GMT

Thanks David.

Yes VIN will be 5V but VDDIO will be 3.3V.

Thor

Re: PF5020 Open Drain Outputs

diazmarin09 — Wed, 04 Jan 2023 22:19:31 GMT

Hello Thor,

Thank you for using the NXP community.

I personally do not think this is going to be an issue. Anyway, I do recommend using the KITPF5020FRDMEVM Schematics as a reference for your design:

I hope this information helps.

Regards,

David

Re: PF5020 Open Drain Outputs

ThorVic — Wed, 04 Jan 2023 22:55:28 GMT

Hi David,
Yes I am using that and the SCH-50735 S32K3-T-Box EVM as a references. But both of them are using 3.3V MCUs and in our application, we are using S32K324 MCU which has 5V and 3.3V IO Domains. I am running out of 3.3V IOs from the S32K324 so I have to use the 5V IOs to read the OD outputs of the PF5020.

Re: PF5020 Open Drain Outputs

diazmarin09 — Thu, 05 Jan 2023 17:08:26 GMT

Hello Thor,

If your main supply voltage is 5V, then, you can pull-up the INTB and PGOOD outputs to such level using a 100kΩ resistor.

Regards,

David