The Pololu S18V20AHV is a compact, monolithic 9-30V step-up/step-down voltage regulator. It functions as either a DC/DC buck regulator (step-down) or boost regulator (step-up) depending on the input voltage relative to the adjustable output voltage. The adjustable output voltage can be anywhere between 2V and the input voltage, allowing the S18V20AHV to be used for powering a wide range of applications. It has a maximum output current of 2A, enabling it to power heavier loads than most other modules. The module is designed to be used as an embedded buck-boost design, meaning it is integrated into the project or system is designed to power, making wire routing easy and efficient. The S18V20AHV also features several protection features such as over-current and short-circuit protection, making it an ideal choice for applications requiring more stringent safety measures.