The Pololu 5V Step-Up/Step-Down Voltage Regulator S8V9F5 is a highly efficient synchronous switching regulator that delivers a steady 5V output from input voltages ranging from 1.4V to 16V. This versatile regulator is ideal for applications with power supplies that can greatly fluctuate, such as batteries that start above but discharge below 5V. Its output current typically ranges between 1A and 1.5A continuous for input voltages that are close to the output. An added feature of this regulator is its optional enable input that can be utilized to put the regulator into a low-power state. This function draws less than 15µA per volt on VIN, making it an energy-efficient choice. The compact design of the board, measuring 10.16mm x 16.51mm, makes it suitable for applications with space constraints. The Pololu 5V Step-Up/Step-Down Voltage Regulator S8V9F5 stands out for its high efficiency, typically between 80% and 90%. This means that it wastes less power as heat, making it a more sustainable and reliable choice for your voltage regulation needs. Whether you're powering a small device or an intricate electronic circuit, this voltage regulator ensures a steady and reliable power supply, even with fluctuating input voltages. Its ability to efficiently convert both higher and lower input voltages makes it a versatile solution for a wide range of applications.