AP64350Q Buck Converter Diodes Incorporated AP64350Q Synchronous Buck Converter is an automotive compliant, 3.5A device that offers a wide input voltage range of 3.8V to 40V. The AP64350Q converter fully integrates a 75mΩ high-side power MOSFET and a 45mΩ low-side power MOSFET to provide high-efficiency step-down DC-DC conversion. This AP64350Q converter is easily used by minimizing the external component count due to its adoption of peak current mode control.