Hello,
Welcome to the DigiKey TechForum. Thanks for the photos, I did some checking and wasn’t able to find a part to match these markings. Do you by chance have a schematic of the board or any other information on the part you could provide ?
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Hi, I don’t have board schematic. I think this part is buck boost converter.
Please, inform as the model name of this device.
Is it a laptop or something else?
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Hi, this board is guitar effect Line 6 Helix LT. I am sure, this is the IC to produce 12v and -12v voltage.
I am sure, Vin = pin 3, and also pin 8 & 9 = 12 volt
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Hi, donaernandoelia.
It is MPQ4458DQT, high frequency step-down switching regulator with an integrated internal high-side high voltage power MOSFET.
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Hi Adam7,
Thank you for the info. Is it MPQ4458DQT produce output -12 volt?
I’m not sure that you should have 12 volts at the output.
You need to check which microcircuit is powered after the choke L1.
The output voltage of this microcircuit depends on the nominal values of the resistance R1 and R2.
And it is calculated using the formula:
Take a large photo of the board with the surrounding parts of the microcircuit U26.
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You are Welcome. 
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