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TPS61028: Different efficiency according to the Lot no

Apex
Prodigy 40 points
Part Number: TPS61028

Hell TI team,

I have tested the TPS61028 boost converter.

And I founded the different efficiency according to the Lot No.

I was wondering what the difference is between 07K A73L and 47K CGGG.

In case of 47K CGGG, especially efficiency of buck mode is much inferior to  07K A73L that is about 15% differency.

Thanks.