ACT4752 Step-Down DC/DC Converter Qorvo ACT4752 Step-Down DC/DC Converter is programmable with bias supply rails for microcontrollers or USB PD controllers. The ACT4752 Converter supports a wide input voltage range from 4.5 to 40V and utilizes a synchronous step-down (buck) voltage regulator architecture. The ACT4752 integrates both high- and low-side MOSFETs while supporting smaller MLCC (multi-layer ceramic capacitor) devices.