Up0104s Datasheet Link May 2026

UP0104S Datasheet Write-Up: Dual Synchronous Buck Controller

Part 5: How to Read the UP0104S Datasheet for Troubleshooting

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c. Enable & Sequencing

1. Input Power: 12V from an ATX power supply enters VCC (Pin 4) and also supplies the drain of the high-side MOSFET.
2. Gate Drives: UGATE1 (Pin 11) and LGATE1 (Pin 10) alternately turn on the top and bottom MOSFETs. A 1Ω–10Ω resistor is often placed in series to dampen ringing.
3. Feedback Loop: The output voltage (e.g., 1.5V) is divided by resistors R1 and R2.

   SOP-14

   No datasheet is complete without a detailed pin diagram. Below is the standard pin assignment for the package. Understanding this pinout is essential for both PCB layout and failure analysis. Up0104s Datasheet

   Conclusion

   • APW7120 (similar pinout and function)
   • RT8105 (Richtek)
   • ISL6545 (Intersil/Renesas)
   • NCP81172 (ON Semi)