22V, 3A Synchronous Step-Down COT Power Module


The XR79103 is part of a family of 22V 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 XR79103 has load current rating of 3A. A wide 4.5V to 22V input voltage range allows for single supply operation from industry standard 5V, 12V and 19.6V rails.

With a proprietary emulated current mode Constant On-Time (COT) control scheme, the XR79103 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 0.2% line and load 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.

The XR79103 is available in a RoHS-compliant, green/halogen-free space-saving 6mm x 6mm x 4mm QFN package.

Read More


  • 3A step-down power module
    • Offers power system ease of design
    • 4.5V to 22V wide single input voltage
    • 3.0V to 22V input range with external bias
    • ≥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 600kHz to 800kHz frequency
    • Selectable CCM or CCM/DCM operation
  • Precision enable and power good flag
  • Programmable soft-start
  • 6mm x 6mm x 4mm QFN Package
  • 22V, 6A power module (XR79106)
  • 22V, 10A power module (XR79110)
  • 40V, 3A power module (XR79203)
  • 40V, 6A power module (XR79206)


  • Drones and remote vehicles
  • FPGA/DSP/processor supplies
  • Industrial control and automation
  • RAID storage systems
  • Telecommunications and infrastructure equipment
  • Distributed power architecture

Design Tools


Pkg Code Details Quantities Dimensions PDF
LGA144 15x15
  • JEDEC Reference:
  • MSL Pb-Free: L3 @ 245ºC
  • MSL SnPb Eutectic:
  • ThetaJA: 14.4
  • Bulk Pack Style: Tray
  • Quantity per Bulk Pack: 119
  • Quantity per Reel: n/a
  • Quantity per Tube: n/a
  • Quantity per Tray: 119
  • Reel Size (Dia. x Width x Pitch): n/a
  • Tape & Reel Unit Orientation: n/a
  • Dimensions: mm
  • Length: 15
  • Width: 15
  • Thickness: 2.83
  • Lead Pitch: 1.27

Parts & Purchasing

Part Number Pkg Code RoHS Min Temp Max Temp Status Buy Now Order Samples
XR79103EL-F LGA144 15x15 -40 125 ACTIVE
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Part Status Legend
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.
Distribution Date Description File

Frequently Asked Questions

The best way to determine this is to go to exar.com and type the part into the search function. At or near the top of the results you should see something that looks like

In this example, we looked for XRA1201. When you hover over it, it will turn grey and you can click anywhere in the grey box. This brings you to the product page. For example:


Click on Parts & Purchasing, highlighted in yellow above. The screen changes to:


Notice the status column and the “Show obsolete parts” link:


A legend tells you the definition of the different statuses. Click on the “Show obsolete parts” link to see EOL or OBS part numbers along with the Active part numbers:


Another method to find out if a part is OBS or EOL is to click on SUPPORT:


And then Product Change Notifications


Type the part into the search, and click on one of the part numbers from the drop down menu. Then you can look for the Product Discontinuation Notice, which generally is at the top of the list, for example:


If you see this, it tells you that this particular orderable part has been discontinued and when the last order date is, or was. If you click on the file, then you can view the notice we sent about this if you purchased the part in the recent past. It may also advise of a replacement part. When an orderable part first becomes discontinued, Product Discontinuation Notices are sent are sent to those who have purchased the parts in the recent past, if purchased directly, with a dated opportunity to place a last order.

Find the product page of the part that you want to get an evaluation board for and click on Parts & Purchasing. Example:


Find the icons under Buy Now or Order Samples:


Click on the Buy Now icon and see who has stock and click on the Buy button:


Alternatively, you can click on the Order Samples


If the icons are missing, then contact Customer Support.

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