22V, 15A Synchronous Step-Down Constant On-Time QFN Module


The XR79115 is a synchronous step-down controller for Point-of Load (POL) supplies up to 15A. A wide 5.0V 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 XR79115 provides extremely fast line and load transient response using ceramic output capacitors. It requires no loop compensation hence simplifying circuit implementation and reducing overall component count. The control loop also provides exceptional load and line regulation and maintains constant operating frequency. A selectable power saving mode allows the user to operate in Discontinuous 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, help achieve safe operation under abnormal operating conditions.

The XR79115 is available in RoHS compliant, green/halogen free space saving 12mm x 12mm QFN package.

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  • 15A capable step-down module
    • Wide 5.0V to 22V input voltage range
    • 4.5V to 5.5V low VIN operation
    • ≥0.6V adjustable output voltage
  • Controller, drivers, bootstrap diode and capacitor, MOSFETs, Inductor, CIN and COUT integrated in one package
  • Proprietary constant on-time control
    • No loop compensation required
    • Stable ceramic output capacitor operation
    • Programmable 200ns to 2?s on-time
    • Constant 400kHz to 600kHz Frequency
    • Selectable CCM or CCM/DCM operation
  • Programmable hiccup current limit with thermal compensation
  • Precision enable and Power-Good flag
  • Programmable soft-start
  • 12mm x 12mm x 4mm QFN package


  • Networking and communications
  • Fast transient Point-of-Loads (POL)
  • Industrial and medical equipment
  • Embedded high power FPGA
  • Repeaters and base stations datasheet

Design Tools


Pkg Code Details Quantities Dimensions PDF
QFN68 12x12
  • JEDEC Reference: n/a
  • MSL Pb-Free: L3 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 15.4ºC/W
  • Bulk Pack Style: Tray
  • Quantity per Bulk Pack:
  • Quantity per Reel: n/a
  • Quantity per Tube: n/a
  • Quantity per Tray: 768
  • Reel Size (Dia. x Width x Pitch): n/a
  • Tape & Reel Unit Orientation: n/a
  • Dimensions: mm
  • Length: 12.00
  • Width: 12.00
  • Thickness: 4.00
  • Lead Pitch: 0.65

Parts & Purchasing

Part Number Pkg Code RoHS Min Temp Max Temp Status Buy Now Order Samples
XR79115EL-F QFN68 12x12 -40 125 Active
XR79115ELTR-F QFN68 12x12 -40 125 OBS
XR79115EVB Board 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.
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