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TPS62067-Q1: inductor recommendation

Part Number: TPS62067-Q1

Dear team,

My customer use 62067-q1 with small output current. Vin=5V, Vout=3.3V, Iout=0.5A(max). Now I need to compute the inductor value, if the current ripple factor is 0.25, then the inductor should be 3uH based on datasheet's formula. When I use Webench to make a simulation as below, the simulation result is inductor=1uH. In this way, the current ripple factor is 0.68 which is not reasonable. Could you please help analyze why Webench recommend 1uH?

Thanks & Best Regards,