Exar’s XR76203-Q is a synchronous step-down regulator 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, it has a load current rating of 3 A. A wide 5,5 V to 40 V input voltage range allows for single supply operation from industry standard 24 V ±10%, 18 V–36 V, and rectified 18 V a.c. and 24 V a.c. rails.
With a proprietary emulated current mode constant on-time (COT) control scheme, the XR76203-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.
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