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TPS65266: BUCK3输出3.3V,不具备带载能力

Part Number: TPS65266

有两个问题请大神帮忙看一下,谢谢

1、buck3配置输出3.3V,实测输出只有3V(空载),将Rdown改小也没有用,Vin=5V,是该DC-DC压降较高吗?

2、buck3  3.0V电压带不动200mA负载(后端负载使用稳压源实测为200mA),这是什么原因,布局都是参考的datasheet布局的

原理图如下: