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LM25088: Difference from lm25088qmh-2

Part Number: LM25088

Our customers have always used lm25088mh-1 to produce their products before. Recently, 1000 pcs products have been replaced by lm25088qmh-2. Other circuits have not been changed. It is found that 300 + PCs are burned out. What are the differences between the two IC scores and the reasons for the burning out