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用TPS62132将7v2给转3v3出现周期性电压塌陷

Other Parts Discussed in Thread: TPS62132

用TPS62132的将7.2V锂电池电压转3V3给4g模块供电,出现4g模块电压周期性塌陷,

原理如图,附件1:

布局部分:

实际波形局部:

以及:

现在的现象是负载4g模块检测到电压不稳,自动复位重启。

无论怎么改后端LC(参考slva463等资料)都是无效,依旧周期性电压塌陷,不同地间的电阻改磁珠也是徒劳

不知如何改善,才消除电压跌落,烦请各位指教