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Question about LDO dropout voltage

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saurav_sdpl

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In my design i am using LP2986 regulator, with 3.3V output and drop out voltage is specified to be .2V @ 200mA load. But when i put a load of 83mA dropout is increased.i.e if at this load input to regulator is 3.6V but output is not 3.3V it is 2.8V

Whether it is related to stability of LDO?????
 

Re: LDO question

This type of LDO needs a well tailored output capacitor ESR, if not in range this can cause instability. The ESR must be between 0.3 and 10Ohm's and the minimum capacitance 4.7u
 

LDO question

saurav_sdpl

I guess the problem comes from your input voltage.
In the datasheet, VIN specifies VO(nom) + 1V and you use 3.6V input to get 3.3V output, I think you are already out of the specification range.

Try increasing your input voltage, and the dropout should be improved
 

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