Synchronous step-down power modules for point-of-load supplies

Designed for point-of-load (PoL) supplies, Exar 10A (XR79110), 15A (XR79115) and 20A (XR79120) XR791xx synchronous step-down power modules are now stocked by Mouser. They target applications such as networking and communications, fast-transient PoL designs, industrial and medical equipment, and embedded high-power FPGA circuitry. The wide 4.5V or 5V to 22V input voltage range allows for single supply operation from industry-standard 5V, 12V, and 19.6V rails. With a proprietary emulated current mode Constant On-Time (COT) control scheme, each of these devices provide extremely fast line and load transient response using ceramic output capacitors. They require no loop compensation hence simplifying circuit implementation and reducing overall component count. A selectable power saving mode allows the user to operate in discontinuous mode (DCM) at light current loads thereby significantly increasing the converter efficiency. Each device includes a host of protection features, including over-current, over-temperature, short-circuit and UVLO for safe operation under abnormal operating conditions.