40V Synchronous Step-Down COT Controller


The XR75100 is a synchronous step-down controller for point-of load supplies up to 20A. A wide 5V to 40V input voltage range allows for single supply operation from industry standard 12V, 18V, and 24V DC and AC rails.

With a proprietary emulated current mode Constant On-Time (COT) control scheme, the XR75100 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 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 XR75100 is available in RoHS compliant, green/halogen free space-saving 16-pin 3 x 3 QFN package.

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  • 20A capable step-down controller
    • Wide 5.5V to 40V input voltage range
    • Integrated high current 2A/3A drivers
    • 0.6V adjustable output voltage
  • Proprietary constant on-time control
    • No Loop compensation required
    • <0.01%/V line regulation
    • Ceramic output cap. stable operation
    • Programmable 200ns-2µs on-time
    • Constant 100kHz-800kHz frequency
    • Selectable CCM or CCM/DCM operation
  • Programmable current limit
    • 110ms hiccup mode
  • Precision enable and power good flag
  • Programmable soft-start
  • Integrated bootstrap diode
  • 16-pin QFN packages


  • Networking and communications
  • Fast transient point-of-loads
  • Industrial and medical equipment
  • Embedded high power FPGA
  • Automotive

Design Tools

Technical Library


Pkg Code Details Quantities Dimensions PDF
QFN16 3x3 OPT5
  • JEDEC Reference: MO-220
  • MSL Pb-Free:
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  • Dimensions: mm
  • Length: 3.0
  • Width: 3.0
  • Thickness: 0.9
  • Lead Pitch:

Parts & Purchasing

Part Number Pkg Code RoHS Min Temp Max Temp Status Buy Now Order Samples
XR75100EL-F QFN16 3x3 OPT5 -40 125 Active
XR75100ELMTR-F QFN16 3x3 OPT5 -40 125 Active
XR75100ELTR-F QFN16 3x3 OPT5 -40 125 Active
XR75100EVB 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.
Distribution Date Description File
02/14/2017 Qualification of alternate assembly subcon, GREATEK, Taiwan. PCN 17-0102-01 Greatek-1033.pdf
03/30/2015 Design, datasheet and alternate assembly site changes. Refer to PCN. PCN_14-1148-01-01-1033.pdf