Adding POR supervisor to PF3000

[ryanmartin]

Hello, we would like to add a POR supervisor to the PF3000 PMIC circuit.  We are using Vin=5V (USB) and want to ensure the power rails come up > 100ms after the USB power is applied to the device to meet USB inrush current specifications.  We are using a coin cell battery on VSNVS, so VSNVS will always be ~ 3.0V.  Is there a reference design available on how to add a POR supervisor to the PWRON pin?

Thanks,

Ryan

[reyes]

Hi Ryan,

Unfortunately, we do not have any reference design available on how to add a POR supervisor to the PWRON pin specifically for the PF3000 PMIC.

However, in different designs, we had handled the POR supervision using a standard voltage supervisor chip named CAT811R from Catalyst Semiconductor.

Consult CAT811R datasheet for details and check if it works for your application.

Hope this helps.

Regards,

Jose

NXP Semiconductors