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TPS62868: 输出电压不稳定问题

Part Number: TPS62868

如上图所示;IIC外部有上拉电阻,但是主控芯片还没有焊接;使用万用表测量输出电压,输出电压在0.796V至0.805V之间波动,请问这是怎么回事? 

其中R217 R219拿掉后接地测试还是不稳,下面是PCB layout和电源波形图,黄色是SW波形,绿色是输出波形。