About High PSR LDO Design

[xjtulw]

Hi, all,

I'm designing a LDO with high PSR of 75dB up to 100KHz.
The input voltage is 3.5 and output is 3.3 with a max current of 300mA.
Any suggestion on the topology of the LDO is welcomed.

Thanks.

Best Regards,

 

[leo_o2]

Mission impossible, I think.
The drop-out is too small.

 

[kwkam]

for my understanding, you need a loop gain at least 75dB at 100KHz, so you need bandwidth as high as 1GHz