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Hi
首先断电测试Vin与SW阻抗,如果明显偏低则是芯片损坏,你需要确认电感是否存在质量问题,以及电感饱和电流是否足够(推荐1.3倍最大输出电流)。
如果上述确认都没有问题,用示波器测试2.5V输出,可能是很不稳定的,因此万用表测试值偏高,此时你需要检查一下layout.