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TPS65917-Q1: Why does 65917 need two input voltage?

Part Number: TPS65917-Q1
Other Parts Discussed in Thread: TPS43351-Q1

Dear team,

Below is the user guide for TDA2 Eco power supply. Can I change the dual channel buck TPS43351-Q1 to single channel buck/Vout=5V? That means PMIC's input voltage only has one 5V. I don't understand why 65917 needs two input voltage(3.3V, 5V). Can I only use single channel buck/5V to power the 65917?

Thanks & Best Regards,

Sherry

Thanks & Best Regards,

Sherry