However, is publicly indexed in major databases (like Mouser, DigiKey, Alldatasheet) as of my latest knowledge. It is likely a proprietary part number (e.g., from a laptop motherboard or a specific OEM like Ricoh, Mitsumi, or an "UP" series controller).
Based on standard naming conventions for electronic components (specifically voltage regulators or similar ICs from brands like Sharp, Infineon, or Japanese vendors), the appears to be a DC-DC converter controller or a power management IC . Up0104s Datasheet