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BQ25121A: Source for VSYS BUCK and LDO

Part Number: BQ25121A

 Hi Team,

Could you, please, assist on the following request:

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In our system we drive the IN input from 5V supply.

 This is the setup:

1. Both battery and 5V at IN input are connected.

2. Battery charging is disabled.

 

Open issues:

1. Which source will drive the VSYS BUCK and LDO in the above setup?  IN (5V) or Battery?

2. Will the battery have impact on the PMIC operation in this state? It isn’t clear. Are you sure that the IN input (5V) is the supply source in this setup. Can you verify this?

 

Thanks,

Fabio