22V, 15A, Synchronous Buck Regulator with 2-Bit VID
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# of Outputs 1
IOUT (A) 15
VIN MAX (V) 22
IQ (µA) 800
VOUT MIN (V) 0.6
Frequency (kHz) 200 to 1250
Accuracy (%) 1
Efficiency (%) 96
Package QFN23
X x Y Package Dimension (mm) 4 x 5
Control Mode Proprietary emulated current mode COT
Special Features 2-Bit VID, Light Load PFM, Enable, Power Good, Power Sequencing, Synchronous Rectification, Thermal Shutdown, UVLO, Built-in 5V LDO, Soft Start Adjustable, Internal Compensation, Adjustable Current Limit
Operating Temperature (°C) -40 to 125
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The MxL76125 device is a synchronous step-down regulator combining the controller, driver, bootstrap diode, and MOSFETs in a single package for point-of-load supplies. The MxL76125 device is rated for 15A load. A wide input voltage range from 5V to 22V allows for single supply operation from industry standard 5V, 12V, and 20V rails.

With a proprietary emulated current mode constant on-time (COT) control scheme, the MxL76125 device provides extremely fast line and load transient response using ceramic output capacitors. The controller does not require any external loop compensation, which simplifies the circuit implementation and reduces the overall component count. It also provides 0.1% load and 0.1% line regulation, and maintains constant switching frequency. A selectable power saving mode enables operation in discontinuous conduction mode (DCM) at light loads, thereby significantly increasing the converter efficiency.

The MxL76125 has a 2-bit VID, meeting the core rail requirements of MaxLinear’s MxL317xx Wi-Fi 7 SoCs. The VID allows the Wi-Fi 7 SoC to optimize performance while minimizing power consumption in both active and idle states by dynamically changing the output voltage of the MxL76125.

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

The MxL76125 device is available in a RoHS compliant, green/halogen-free space-saving 4mm x 5mm QFN package.

  • 15A step-down regulator
    • Low VIN operation from 4.5V to 5.5V
    • Wide single input voltage from 5V to 22V
    • VIN operation from 1V to 22V with external 5V bias
    • ≥0.6V adjustable output voltage
    • 2-bit VID for MaxLinear Wi-Fi 7 SoCs
    • Adjustable VID resolution through RREF
  • Proprietary constant on-time control
    • No loop compensation required
    • Stable operation with ceramic output capacitors
    • Programmable on-time ≥ 40ns
    • Constant 200kHz-1.25MHz frequency
    • Selectable forced CCM or CCM/DCM operation
  • Output over-voltage, over-current and over-temperature protections
  • Power-good flag with low impedance when power is removed
  • Precision enable
  • Programmable soft-start time
  • 4mm x 5mm QFN package

  • MaxLinear Wi-Fi SoC core rail
  • Puma® and AnyWAN® based CPE
  • Servers
  • Distributed power architecture
  • FPGA, DSP and processor supplies
  • Base stations, switches/routers

Documentation & Design Tools

Type Title Version Date File Size
Data Sheets MxL76125 22V, 15A, Synchronous Buck Regulator with 2-Bit VID R01 January 2023 2.1 MB
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Quality & RoHS

Part Number RoHS | Exempt RoHS Halogen Free REACH TSCA MSL Rating / Peak Reflow Package
MxL76125-AQB-R N Y Y Y Y QFN22 L2 / 260ᵒC

Click on the links above to download the Certificate of Non-Use of Hazardous Substances.

Additional Quality Documentation may be available, please Contact Support.

Parts & Purchasing

Part Number Pkg Code Min Temp Max Temp Status Buy Now Order Samples
MxL76125-AQB-R QFN22 5x4 -40 125 Active Order
MxL76125-EVK-1 Board Active

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.


Pkg Code Details Quantities Dimensions
QFN22 5x4
  • JEDEC Reference:
  • MSL Pb-Free: L2 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA:
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  • Quantity per Bulk Pack:
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  • Quantity per Tube:
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  • Dimensions: mm
  • Length: 5.00
  • Width: 4.00
  • Thickness: 0.85
  • Lead Pitch: