The performance of the uP0104 is defined by the following typical parameters (assuming a 5V output variant at 25°C):
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
How does the UP0104S stack up against alternatives? The datasheet reveals its niche.
| IC | Channels | Max VIN | Special Feature | Compatibility | | :--- | :--- | :--- | :--- | :--- | | UP0104S | 2 | 12V | Dual independent, simple enable | Native | | RT8101A | 1 | 12V | Single, higher gate drive | Not a direct drop-in | | APW7120 | 1 | 12V | Single with OVP | Different pinout | | ISL6227 | 2 | 24V | More advanced sequencing | Larger package | The performance of the uP0104 is defined by
The UP0104S is ideal when you need two independent rails (e.g., 1.2V and 2.5V) from a single 12V supply without the complexity of I2C or sequencing.
| Parameter | Value | | :--- | :--- | | Input Voltage (VCC) | 5V to 12V (Absolute max 13.2V) | | Output Voltage Range | 0.9V to 3.3V (externally adjustable) | | Number of Outputs | 2 (Dual, independent) | | Switching Frequency | 200 kHz to 500 kHz (programmable) | | Control Method | Voltage Mode PWM | | Protection Features | UVLO, OCP, OVP | | Package | SOP-14L (Small Outline Package, 14 pins) | How does the UP0104S stack up against alternatives
This IC is not intended for high-voltage applications (e.g., AC-DC converters). Instead, it excels at generating secondary rails like VDDQ (memory voltage), VTT (termination voltage), or small VCORE supplies for chipsets.