Exar – 40V regulator family simplifies system design in industrial systems

Exar Corporation’s XR7620x line of 40V buck switching regulators supports a wide input-voltage range of 5V-40V while providing excellent transient response and output accuracy.

Part of the PowerBlox™ family of DC-DC converter products, the XR76203, XR76205 and XR76208 are synchronous step-down regulators providing Point-of-Load (PoL) supplies of 3A, 5A and 8A. They are intended for use in systems powered by well-regulated 24V DC, standard telecoms 18V- 36V or rectified 18V AC or 24V AC supplies.

Benefitting from Exar’s proprietary emulated current-mode Constant On-Time (COT) control loop, the XR76203, XR76205 and XR76208 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 mode when supplying light loads, which helps to improve the converter’s efficiency.

The parts are available in 30-pin, 5mm x 5mm QFN packages.


  • Distributed power architectures
  • PoL converters
  • Power-supply modules
  • Power supplies for FPGAs, DSPs or processors
  • Networking and telecoms equipment


  • Integrated controller, drivers, bootstrap diode and MOSFETs
  • Stable with ceramic output capacitors
  • Over-current, over-temperature and short-circuit protections
  • Under-voltage lock-out

Orderable Part Numbers: XR76203EVB, XR76205EVB and XR76208EVB