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TPS61029: how to calculate L

Part Number: TPS61029

Hello,

 

My customer is confused with the equation (5) in the datasheet.

He design is Vbat=3.8V and Vout=5.0V.

In this case, which numerator of the equation is correct, Vbat x (Vout + Vbat) or Vbat x (Vout - Vbat)?

 

Best regards,

 

K.Hirano