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LMR23625-Q1: DCDC转换器上电故障问题

Part Number: LMR23625-Q1

Dear Team:

应用原理图如下:

设计输入电压范围:DC 24V~30V

输出电压:3.3V

输出电流:<2A

问题描述:在应用中芯片出现偶发性上电故障,故障率为4/30,表现为输出电压为0V,SW节点(Pin1无输出波形),VCC引脚(Pin 3)测试值1.7V(正常值应该为4.1V,内部LDO异常?),更换新芯片后问题解决,但问题难以再次复现。请E2E的各位专家帮忙给些建议,什么原因会导致VCC引脚输出异常。

regards

Theo