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TPS54360输出的5V电压出现渐渐降低问题

Other Parts Discussed in Thread: LM1117, TPS54360

采用数据手册上面的电路图,没有上MUC的时候,3.3V电压正常,但是焊接了MUC后,3.3V电压就出现掉电现象,0.01v的一直往下降,慢慢的降低。请问是什么问题?测过3.3V,5V,和GND,都是没有短路的。板子上除了MUC就一个FLISH。TVS12改用了SMA48CA,电源输入是12V/3A的稳压电源