FTM Board Club
40V, 3A Synchronous Step-Down COT Power Module

The XR79203 is part of a family of 40V synchronous step-down power modules combining the controller, drivers, Inductor, passive components and MOSFETs in a single package for point-of-load supplies.

This module requires very few external components leading to ease of design and fast time-to-market. The XR79203 has load current rating of 3A. A wide 5V to 40V input voltage range allows for single supply operation from industry standard 24V 10%, 18V to 36V and rectified 18VAC and 24VAC rails.

With a proprietary emulated current mode Constant On-Time (COT) control scheme, the XR79203 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 0.1% load and 0.2% line regulation and maintains constant operating frequency.

A selectable power saving mode, allows the user to operate in Discontinuous Current Mode (DCM) at light current loads thereby significantly increasing the converter efficiency.

A host of protection features, including overcurrent, over temperature, short-circuit and UVLO, helps achieve safe operation under abnormal operating conditions.

  • 3A step-down power module
  • Offers power system ease of design
  • 5V to 40V wide single input voltage
  • ≥0.6V adjustable output voltage
  • Controller, drivers, inductor, passive components and MOSFETs integrated in one package
  • Proprietary constant on-time control
  • No loop compensation required
  • Stable with ceramic output capacitors
  • Programmable 100ns to 1μs on-time
  • Constant 400kHz to 800kHz frequency
  • Selectable CCM or CCM/DCM operation
  • Precision enable and power good flag
  • Programmable soft-start
  • 8mm x 8mm x 4mm QFN Package
  • 40V, 6A power module (XR79206)
  • 22V, 3A power module (XR79103)
  • 22V, 6A power module (XR79106)