The XR76203, XR76205 and XR76208 are synchronous step-down (buck) regulators combining the controller, drivers, bootstrap diode and MOSFETs in a single package for point-of-load supplies. The devices, which are made by Exar, have load current ratings of 3 A, 5 A and 8 A respectively. A wide 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 control scheme, the regulators 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 0,07% 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 at light current loads, significantly increasing the converter efficiency.
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