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ldo transient response

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rekha410

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i am designing capacitorless ldo ,i/p is 2v and o/p is 1.8v......getting good stability.But for transient response when i am applying 0 to 50m current step,o/p voltage is getting reduced to almost zero when current is changing from 50m to 0m.why this much spikevoltage is appering.please help me....
 

how much the on-chip capacitor at the output ? < 100 pF ?
how is the current ramp ? what is pulse width ?

without any details, it is hard to help. The only thing I can see you have to speed up you feedback loop as much as you can.
 

on chip cap=100pico farad,Resr=0 ohms.current pulse width=50u,rise time=1pico sec,fall time=1ps,current 0 t0 50ma.GBW=1Mhz,phase margin=81db.drop out voltage=200mv,supply voltage 1.8v.
 

What is the LDO short circuit current and if you give a long pulse does the LDO eventually come back to regulation?
 

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