When replacing this IC ensure the marking “K4=” matches the board’s installed part (e.g., RT6228B RT6228BGQUF K4=). Check that your system requires an 8 A synchronous buck converter with up to 23 V input. Confirm the board mounting is compatible with the UQFN-12HL 3×3 package. Also verify the output voltage requirement (e.g., 3.3 V fixed) aligns with the variant you’re replacing. Lastly, ensure layout guidelines (thermal pad, MOSFET routing) are satisfied for proper heat dissipation.

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RT6228B RT6228BGQUF K4= Marking K4= RT IC
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Description
Specification
The RT6228B RT6228BGQUF K4= Marking K4 series, including part number RT6228BGQUF (marking “K4=”), is a synchronous step-down (buck) converter designed for up to 8 A output current and input voltages up to 23 V
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