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TPS54331 12V转3.3V输出后内阻的问题

如上图所示,通过上图的电路可以输出3.3V的电压,空载时可以得到3.3V,但是接入5欧姆的负载之后,输出电压变成了1.75V左右,使用10K的电阻接入,3.3V电压没有变化,因为上图电路不是个恒压源,并且存在着内阻的原因,导致了接入5欧姆负载后输出电压的变化,请问有什么办法解决吗?