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请教TPS2121输出掉电问题

Other Parts Discussed in Thread: TPS2121, TPS62291

电路框图如下:

电路图如下:

当USB和电池同时供电时(此时为USB选通),当3.3V后一个负载启动后,电源会掉电数毫秒,导致系统断电关机,波形如下图

紫色为3.3V输出电流(1.2A,200uS),黄色为TPS2121输出,蓝色为USB输入电压TPS2121问题点.pptx