Exar – Complete power modules feature wide input-voltage range and high efficiency

The XR79x0x family of power modules from Exar enables designers to quickly and easily implement a high-current single-channel power supply suitable for a wide variety of end-product applications.

Their wide input-voltage range allows for single-supply operation from industry standard 5V, 12V and 19.6V rails in the case of the XR79103 and XR79106, and from industry standard 24V, 18V-36V and rectified 18V AC and 24V AC rails in the case of the XR79203 and XR79206.

These synchronous step-down power modules are fully integrated power converters configured as a system-in-package and include a controller, drivers, bootstrap diode/capacitor, MOSFETs, inductors and internal input and output capacitors.

A patented emulated current-mode Constant On-Time (COT) control scheme provides 0.1% line regulation over the full input-voltage range and 1% output accuracy over the full temperature range. This COT control loop enables operation with ceramic output capacitors, eliminating the need for loop compensation components.

A selectable power-saving mode allows the user to operate in discontinuous-current mode when supplying light loads thereby markedly increasing the converter’s efficiency.

The devices’ QFN package has large pads for better thermal performance, and all pins are accessible for easy debugging and routing.

Part Number Output Current (A)Input Voltage Range (V)Output Voltage Range (V)Frequency (kHz)EfficiencyQFN Package Size (mm)
XR79203 3 3 to 400.6 to 13.2 300 to 500 95% 8 x 8 x 4
XR79206 6 3 to 40 0.6 to 13.2 300 to 500 95% 10 x 10 x 4
XR79103 3 3 to 22 0.6 to 5.5 600 to 800 95% 6 x 6 x 4
XR79106 6 3 to 22 0.6 to 5.5 600 to 800 95% 8 x 8 x 4


  • FPGA, DSP and ASIC power supplies
  • Industrial and embedded systems
  • Telecoms equipment
  • Industrial control and automation
  • Drones and remote vehicles


  • Over-current protection
  • Over-temperature protection
  • Short-circuit protection
  • Under-voltage lock-out
  • Programmable soft start


Orderable Part Numbers: XR79203EVB, XR79103EVB, XR79206EVB and XR79106EVB