SLUSF25 September 2025 UCC27834
PRODMIX
Because the UCC278X4 is a 3.5A, peak-current driver, it requires the placement of low-esr noise-decoupling capacitance as close as possible from the VDD terminal to the VSS terminal to ensure a stable supply during switching. Ceramic capacitors with stable dielectric characteristics over temperature are recommended, such as X7R or better. Additionally, a larger electrolytic capacitor may also be added in parallel to act as an energy storage capacitor, especially in systems with large gate charge.
The recommended electrolytic capacitor is a 22μF, 50V capacitor. The recommended decoupling capacitors are a 1μF 0805-sized 50V X7R capacitor, ideally with (but not essential) a second smaller parallel 100nF 0603-sized 50V X7R capacitor.
Similarly, a low-esr X7R capacitance is recommended for the HB-HS power terminals which must be placed as close as possible to device pins.