In the world of power supply design, few components are as critical—or as widely misunderstood—as the PWM (Pulse Width Modulation) controller. Among the myriad of options available to engineers and repair technicians, the UP0104S stands out as a highly specialized, dual-output controller. While not a household name, this IC is a workhorse found on numerous motherboards, graphics cards, and embedded systems, particularly those manufactured in the late 2000s and early 2010s.
If you are searching for the UP0104S datasheet, you are likely facing one of three scenarios: designing a low-voltage power rail, troubleshooting a dead motherboard with missing VCORE, or attempting a repair on a GPU that refuses to power up. This article serves as an exhaustive resource—synthesizing the critical electrical characteristics, pinout, application circuits, and troubleshooting tips found in the official technical documentation. Up0104s Datasheet
| Parameter | Value/Description | |-----------|-------------------| | Input voltage (VCC) | 5V or 12V (typical application) | | Output voltage range | 0.6V to VCC – 2V | | Output current | Limited by external MOSFETs (up to ~15A per channel) | | Switching frequency | Adaptive on-time, varies with VIN/VOUT (typical 300–500 kHz) | | Number of channels | 2 (independent outputs) | | Synchronous rectification | Yes (built-in drivers for high-side & low-side MOSFETs) | | Protection features | UVLO, OCP (cycle-by-cycle), OVP, thermal shutdown | | Package | SOP-14 / TSSOP-14 (varies by suffix) | In the world of power supply design, few
Beware of fake or incomplete "datasheet" websites that only provide a pinout without electrical tables. To obtain the genuine UP0104S datasheet (revision 1.2 or later), use these sources: Direct PDF Download: Search for file name UP0104S_DS_V1
UP0104S_DS_V1.2.pdf.Pro Tip: Many online "datasheets" for the UP0104S are actually cross-references to the RT8101 or ISL6545. Always compare the pinout diagram. If it doesn't show 14 pins, it's the wrong document.