VSYS pin on nPM1100 integrated Power Management IC

[Avgerinos]

I am designing an application using the nPM1100 and I would like to know if I can use the VSYS as a power supply pin for my other circuit.

Is VSYS supplied by the battery when USB is not connected on nPM1100 integrated Power Management IC?

What is the voltage on VSYS when the USB is disconnected?

Thank you

[Pallav Aggarwal]

There is a plot in the product specification document, you will be able to see how Vsys voltage will be. 

Yes, the power path switch will connect the battery to VSYS when the USB is not connected.

[Avgerinos]

Which Figure is the plot about Vsys that you are talking about?

[Pallav Aggarwal]

Check : https://infocenter.nordicsemi.com/pdf/nPM1100_PS_v1.0.pdf

Page 17, 18,19

[Avgerinos]

I was checking at these figures, but it does not say what happens to vsys when vbus is 0V or disconnected. That is why I am confused about it. It would be useful to see a plot with vsys, vbus and vbat. So it will be clear what happens when vbus is disconnected but there is a voltage on vbat due to the battery, and how the vsys voltage is affected. 

[Amanda Hsieh]

Hi, 

(Updated)

We took some measurements to show this. Please let me know if it doesn’t answer the question.

-Amanda H.