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LP87524P-Q1: Power consumption calculation to get the input current value

Part Number: LP87524P-Q1

Hi team

I would like to know how to calculate the input current since I need to choose a proper pre-stage buck input, is that add 4 channels power consumption together? Or (1*3+1*3+1.8*2.5+1.2*1.5)/3.3=input current value? Is there an efficiency factor for the PMIC?