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TPS54540B: Difference in more detail compared to TPS54540

Part Number: TPS54540B
Other Parts Discussed in Thread: TPS54540, , TPS54340

Hi team,

Could you give me comments on following customer questions? They want to know more detail about difference between TPS54540B and TPS54540. 

<Customer question>

Q1. For addition of poly-imide (PI) coat, does it cause any differentiation of function or electrical characteristics? The customer assumes no difference, but for the case of TPS54340, they are not sure why the part number is changed just because of the addition of coat. 

Q2. For improved output OVP circuit with TPS54540B, what kind of issue/concern with TPS54540 was improved? 

Best regards,

Takeshi Sasaki