Up0104s Datasheet

| Symptom | Likely Cause | Datasheet Checkpoint | | :--- | :--- | :--- | | No output, VCC present | IC in UVLO or disabled | Measure EN1/EN2 (Pins 13 & 5). Must be >2.0V. Check VCC >4.3V (Pin 4). | | Output voltage too low | Feedback divider wrong or output short | Verify FB pin voltage (Pins 1 or 14). Should be exactly 0.8V. If lower, output is shorted or divider is incorrect. | | MOSFETs burning hot | Cross-conduction or wrong frequency | Check UGATE and LGATE dead-time (requires oscilloscope). Replace with matched MOSFETs from datasheet spec. | | Intermittent startup | SS capacitor leakage or unstable COMP | Inspect the soft-start capacitor (Pin 3 for Ch2, shared for Ch1). Leakage here prevents ramp-up. |

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. Up0104s Datasheet

Search for “UP0104S datasheet PDF” from the manufacturer or authorized distributor to get exact electrical characteristics, recommended external components, detailed pin description, thermal data, mechanical drawing, and regulatory/test graphs. Use the part marking and package code to pick the correct variant. | Symptom | Likely Cause | Datasheet Checkpoint