LG U8138 Service Manual page 31

3. TECHNICAL BRIEF
USB regulator input voltage is 5V and uses external USB device power through IO Connector.
Output voltage is 3.3V and supply to MARITA USB block.
USB is detected by MARITA GPIO40(USBSENES).
• VUSB / (10K + 51K) = VUSBSENSE / 51K
Figure. Schematic of USB Regulator
Figure. Schematic of USB filter
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