MaxLinear's XR79120 is a 20 A synchronous step-down power module for point-of-load supplies. Power modules integrate the controls, MOSFETS, inductors, and capacitors at a density not possible on a PCB. A wide 4.5 V to 22 V input-voltage range allows for single supply operation from industry standard 5 V, 12 V, and 19.6 V rails.

With a proprietary emulated current mode constant-on-time (COT) control scheme, the XR79120 provides extremely fast line and load transient response using ceramic output capacitors. It requires no loop compensation, simplifying circuit implementation and reducing overall component count. The control loop also provides 0.12% load and 0.17% line regulation and maintains constant operating frequency. A selectable power saving mode allows the user to operate in discontinuous mode (DCM) at light current loads, thereby significantly increasing the converter efficiency. With a 93% peak efficiency and 84% for loads as low as 100 mA, the XR79120 is suitable for applications where lower power losses are important.

A host of protection features, including over-current, over-temperature, short-circuit, and UVLO, help achieve safe operation under abnormal operating conditions. Other versions are also available, refer to XR79103 (3 A), XR79106 (6 A), XR79110 (10 A), and XR79115 (15 A) for more information.