MaxLinear's XR76203-Q and XR76205-Q are synchronous step-down regulators combining the controller, drivers, bootstrap diode, and MOSFETs in a single package for point-of-load supplies well-suited for automotive applications. Qualified per AEC-Q100, these regulators have a load current rating of 3 A for the XR76203-Q, or 5 A for the XR76205-Q. A wide 5.5 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 and 12 V battery systems requiring inherent load dump protection.

With a proprietary emulated current mode constant on-time (COT) control scheme, the XR76203-Q and XR76205-Q 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 0.07% load and 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.