AP64102Q Synchronous Buck Converter Diodes Inc. AP64102Q Synchronous Buck Converter is an automotive-compliant 1A synchronous buck converter with a wide input voltage range of 3.8V to 40V. The device fully integrates a 150mΩ high-side power MOSFET and an 80mΩ low-side power MOSFET to provide high-efficiency step-down DC-DC conversion. The AP64102Q is easily used by minimizing the external component count due to its adoption of peak current mode control and its integrated loop compensation network.