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LM3658用法

1. 我看了数据手册,但是没太看懂LM3658SD/NOPBLM3658SD-A/NOPBLM3658SD-B/NOPB,能简单描述区别以及如何应用吗?

2. 我设计时采用的LM3658SD/NOPB,但是货期时间比较长,我可以直接采用LM3658SD-A/NOPB,两者可以pin to pin替换吗?