SparkFun AP63203 Buck/BabyBuck Regulator Breakouts

SparkFun AP63203 Buck/BabyBuck Regulator Breakouts

SparkFun AP63203 Buck/BabyBuck Regulator Breakouts are 2A synchronous buck converter boards that operate at 3.8V to 32V wide input voltage range. These breakouts integrate a 125mΩ high-side and a 68mΩ low-side power MOSFET that provides high-efficiency step-down DC/DC conversion. The AP63203 breakout regulators feature a proprietary gate driver design and Frequency Spread Spectrum (FSS) for Electromagnetic Interference (EMI) reduction. These regulator breakouts offer 0.8V ±1% of the reference voltage, 22µA ultralow quiescent current, and 3.3V output voltage. The Buck regulator is available in a 1-inch x 1-inch board and the BabyBuck regulator is available in a 0.4-inch x 0.5-inch board.


  • Proprietary gate driver design for best EMI reduction
  • Frequency Spread Spectrum (FSS) to reduce EMI
  • Precision enable threshold to adjust UVLO
  • Totally lead-free and fully RoHS compliant
  • Halogen and antimony free
  • Protection circuitry:
    • Overvoltage protection
    • Cycle-by-Cycle peak current limit
    • Thermal shutdown


  • 3.8V to 32V input voltage range
  • Upto 2A continuous output current
  • 0.8V ±1% reference voltage
  • 22µA ultralow quiescent current
  • 3.3V fixed output voltage

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Mike is the founder and editor of, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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