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Problem with delay when switching a device between adapter and battery

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saurav_sdpl

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In the given schematic i am running the device mainly on adaptor , but in the absence of mains supply i am switching over to battery supply through mosfet.

But practically when i am testing the circuit ,during transistion from adaptor to battery it takes 2sec, during which i loose my important data saved in micro.

what could be the possible reason for this delay.

I am also using a boost regulator for battery powered supply

Its urgent plz help
 

Re: Schematic

Bad picture. Unreadable labels. Post it as gif and in greater resolution.
 

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