Power IC microchip identification

A118

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Hello everybody!
I need your help in the chip identification.
After a failed connection (12V instead of 5V) burned Power IC microchip (20 pin) - see the picture.
Unfortunately, it is non-standard marking "46 = 1A", "G17".
Tell me, please, analogue of this chip.
P.S. Other board elements are not affected - checked.

dvr b40 a118.jpg
 
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