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
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