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TPS630250: Inquire Quiescent Current improvement and datasheet spec question

Part Number: TPS630250

Hi sir,

Please refer my SCH as below, the datasheet shows Quiescent Current is between 35uA to 70uA, but Actual measurement value is about 76uA, do you have any suggest can help us to improve the Quiescent Current performance?

In addition, may I learn from you why datasheet P.6 figure 2 Quiescent Current vs Input Voltage shows the lowest Quiescent Current can under 8uA? 

Thank you.

Edward Chen