Up0104s — Datasheet

Both channels use an internal 0.6V reference.
VOUT = 0.6 × (1 + Rtop / Rbottom)

Example: For 1.8V (DDR VDDQ), use Rtop = 2kΩ, Rbottom = 1kΩ.

To ensure stability and prevent oscillation, the uP0104 requires capacitors on both the input and output.

The UP0104S is a synchronous buck (step-down) PWM controller designed to convert a higher input voltage (e.g., 12V) into a lower, precisely regulated output voltage (e.g., 1.2V–5V) with high efficiency. It is frequently found in DDR memory power supplies, chipset/VCCIO rails, and general point-of-load (POL) regulation on PC motherboards, LCD TVs, and embedded systems.

If you want, I can (1) summarize the exact electrical tables (VIN, VOUT, ICC, ISHUT, ripple, transient response) from the official datasheet for a specific UP0104S variant, or (2) generate a reference schematic and PCB layout checklist — tell me which you prefer.

The UP0104S is a high-performance 3A Low Dropout (LDO) linear regulator typically manufactured by uPI Semiconductor Corp (often listed via distributors like Veswin Electronics or Jotrin Electronics). It is designed for applications where high current delivery, low noise, and space efficiency are critical, such as in personal electronics and data center computing. Key Technical Specifications

Based on its datasheet parameters, the UP0104S stands out for its high current capacity in a compact form factor: Output Current: Maximum of 3A. On-Resistance (

RDS(ON)cap R sub cap D cap S open paren cap O cap N close paren end-sub ): Approximately 100mΩ.

Input Voltage Range: Typically supports 3.5V to 15V (depending on the specific sub-variant like the UP0104SSW8).

Quiescent Current: Roughly 35μA, making it significantly more efficient for battery-powered devices than standard regulators like the AMS1117.

Operating Temperature: Specified over an extended range of -40°C to +105°C. Up0104s Datasheet

Package Type: Most commonly available in a PSOP-8 or SOP-8 (8-pin Small Outline Package). Applications & Usage

The UP0104S is frequently used in high-density interconnect applications where PCB space is limited. Common use cases include:

Personal Electronics: Battery-powered sensors and embedded systems.

Computing: AMD platforms, console hardware, and data center enterprise systems. Industrial: Automotive hybrid and powertrain systems. Design Considerations

Thermal Management: The PSOP-8 package is designed for improved thermal performance, but for 3A loads, designers should ensure adequate copper pours and thermal vias on the PCB.

Stability: It typically requires a 10μF tantalum capacitor on the output to stabilize load transients and a 100nF ceramic capacitor on the input for noise filtering.

Pin Arrangement: Unlike some standard regulators, the UP0104S arrangement is specifically designed to minimize parasitic capacitance for high-speed performance. Manufacturer & Availability

While originally part of the uPI Semiconductor Corp catalog, it is also associated with UIMICRO in distributor listings. You can typically find detailed PDF datasheets or technical support for pinouts and schematics through authorized distributors like Veswin. UP0104S UIMICRO Other Components - Veswin Electronics

The UP0104S is a high-performance integrated circuit (IC) primarily used in power management and signal buffering. Often found in modern motherboards and automotive systems, it is manufactured by uPI Semiconductor Corp (sometimes listed via distributors as UIMICRO).

The following blog post breaks down the technical specifics found in the UP0104S datasheet to help engineers and hobbyists integrate it into their designs. Deep Dive: The UP0104S Power Management IC Both channels use an internal 0

For anyone working on high-density electronics, finding a reliable, space-saving power solution is a constant challenge. The UP0104S steps into this role as a versatile IC designed for stability and efficiency. ⚡ Key Technical Specifications

The UP0104S is built for durability and precision. According to the standard UP0104S Product Details, its core specs include:

Package Type: Available in a compact SOP-8 or QFN-10 footprint, making it ideal for space-constrained PCB layouts.

Operating Temperature: Rated for an extended range of -40°C to 105°C, suitable for demanding industrial or automotive environments.

Voltage Handling: Capable of handling significant drain-source voltages (up to -100V in some FET-based configurations) and standard logic-level gate-source voltages. 🛠️ Common Applications You will most likely encounter this chip in:

Enterprise Systems: High-performance computing and data centers.

Automotive Electronics: Hybrid and electric powertrain management.

Motherboard Power Regulation: Often used to manage 5VDUAL voltage planes and sleep states (ACPI compliance).

Signal Integrity: Specifically designed to minimize parasitic capacitance in high-speed data transmission lines. 📋 Understanding the Pin Configuration

The "S" variant of the UP0104 series is unique because its pin arrangement is optimized for high-density interconnects. While the "P" variant (UP0104P) is a standard drop-in for legacy systems, the UP0104S features a layout intended to reduce signal interference. 💡 Design Tips for Engineers Avoid Mixing Variants: Do not swap the Go to product viewer dialog for this item. Note: Pin 14 often serves dual function; check

with the UP0104P without checking your schematic; the pin assignments differ to optimize power delivery vs. signal integrity.

Thermal Management: Use the SOP-8's thermal pad (if present) to manage heat during high-speed switching tasks. Procurement: You can find the

at specialized distributors like Worldway Electronics or through retailers like Alibaba and eBay.

💡 Pro-Tip: Always verify the "Marking Code" on the physical chip, as these small SOP-8 packages can sometimes share similar physical appearances with other uPI regulators.

If you tell me the specific device you are repairing or designing (e.g., a laptop motherboard, an IoT sensor), I can provide more tailored schematic advice or equivalent replacement suggestions. UP0104S - UPI Semiconductor Corp - Worldway Electronics

Functionally, the uP0104 consists of:

The performance of the uP0104 is defined by the following typical parameters (assuming a 5V output variant at 25°C):

| Pin | Name | Description | |-----|------|-------------| | 1 | VCC | Supply voltage (4.5V–13.2V typical) | | 2 | EN1 | Enable for channel 1 | | 3 | FB1 | Feedback for channel 1 (0.6V reference) | | 4 | COMP1 | Compensation for channel 1 (RC to FB1) | | 5 | LGATE1 | Low-side gate driver for channel 1 | | 6 | PGND | Power ground | | 7 | PHASE1 | Switch node for channel 1 (connect to inductor & high-side source) | | 8 | BOOT1 | Bootstrap for channel 1 high-side driver | | 9 | UGATE1 | High-side gate driver for channel 1 | | 10 | PHASE2 | Switch node for channel 2 | | 11 | UGATE2 | High-side gate driver for channel 2 | | 12 | BOOT2 | Bootstrap for channel 2 | | 13 | LGATE2 | Low-side gate driver for channel 2 | | 14 | FB2/COMP2 | Combined FB/COMP for channel 2 |

Note: Pin 14 often serves dual function; check your specific datasheet variant.