MaxLinear's 1 A, 3 A, 5 A, and 8 A 40 V synchronous step-down regulators in small 5 mm by 5 mm QFN packages utilize MaxLinear's proprietary constant on-time architecture to provide superior line and load regulation, fast transient response, and stability with ceramic output capacitors.

The XR76201, XR76203, XR76205, and XR76208 are synchronous step-down regulators combining the controller, drivers, bootstrap diode, and MOSFETs in a single package for point-of-load supplies. The XR76201, XR76203, XR76205, and XR76208 have load current ratings of 1 A, 3 A, 5 A, and 8 A, respectively. A wide 3 V to 40 V input voltage range allows for single supply operation from industry standard 24 V ± 10%, 18 V to 36 V, and rectified 18 V _AC and 24 V_AC rails.

With a proprietary emulated current mode constant-on-time (COT) control scheme, the XR76201, XR76203, XR76205, and XR76208 provide extremely fast line and load transient response using ceramic output capacitors. They require no loop compensation, simplifying circuit implementation and reducing overall component count. The control loop also provides 0.05% (XR76201) or 0.07% (XR76203, XR76205, XR76208) load regulation, 0.15% line regulation, and maintains constant operating frequency. A selectable power saving mode allows the user to operate in discontinuous conduction mode (DCM) at light current loads, thereby significantly increasing the converter efficiency.