About High PSR LDO Design

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xjtulw

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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,
 

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

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

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