Up0104s — Datasheet !!top!!

Introduction 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.

| IC | Channels | Max VIN | Special Feature | Compatibility | | :--- | :--- | :--- | :--- | :--- | | | 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 | Up0104s Datasheet

If you are searching for the , 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. Part 1: What is the UP0104S? The UP0104S is a dual synchronous buck PWM controller designed specifically for low-output-voltage, high-current DC-DC conversion. Manufactured originally by uPI Semiconductor (UniPower Integrated Circuit), this IC provides two independent regulated outputs or can be configured for a single high-current output using two interleaved phases. Key Features at a Glance (From the Datasheet) | 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) | Introduction In the world of power supply design,