MP4315 Synchronous Step-Down Converters Monolithic Power Systems (MPS) MP4315 Synchronous Step-Down Converters offer a configurable frequency and an integrated internal high-side MOSFET (HS-FET) and low-side MOSFET (LS-FET). The MP4315 delivers up to 5A of highly efficient output with current mode control for fast loop response. The device accommodates a wide 3.3V to 45V input voltage range ideal for various step-down applications in automotive input environments.