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TPS5432: TPS5432输出3.3V短路, 芯片损坏,找不到原因,怀疑损坏是在开机的时候,芯片的5V输入是通过TPS54620的转换输出的5V,

Part Number: TPS5432

TPS5432用在我们的控制板上面输出3.3V,   整个设备在老化架上反复的开机关机老化测试,工作一段时间后发现设备不能工作,经查找发现TPS5432输出3.3V短路损坏,更换芯片后设备又可以正常工作,请帮忙分析芯片输出短路的原因,原理图如下,十万火急,