SparkFun Buck Regulator Breakout - 3.3V (AP63203)

Who doesn't occasionally need power regulation? We certainly do, so we've designed the SparkFun Buck Regulator Breakout to help us with just such a task. Featuring the AP63203 from Diodes Inc, this breakout board takes advantage of a 2A synchronous buck converter that has a wide input voltage range of 3.8V to 32V and fully integrated 125mΩ high-side power MOSFET/68mΩ lowside power MOSFET to provide high-efficiency step-down DC/DC conversion. All of this snuggled up in a low-profile, TSOT26 package that's integrated into a 1in. by 1in. board.

Input power for this Buck Regulator can be supplied in a number of ways. There are screw terminals on the right side of the board, solder pads for a barrel jack, which can be mounted on the top or bottom side of the board, and the plated through holes on the left side of the board can all be used as input. Output can be obtained via the screw terminals or the plated through holes. Additionally, to dissipate some of the excess heat, we've added a copper pad for a heat sink on the back of the board.

Frequency Spread Spectrum (FSS) reduces EMI and a proprietary gate driver scheme resists switching node ringing without sacrificing MOSFET turn-on and turn-off times, which further erases high-frequency radiated EMI noise.

  • VIN 3.8V to 32V
  • VOUT 3.3V
  • Up to 2A Continuous Output Current
  • 0.8V ± 1% Reference Voltage
  • 22µA Ultralow Quiescent Current
  • Switching Frequency - 1.1MHz
  • Supports Pulse Frequency Modulation (PFM)
    • Up to 80% Efficiency at 1mA Light Load
    • Up to 88% Efficiency at 5mA Light Load
  • Fixed Output Voltage - 3.3V
  • Proprietary Gate Driver Design for Best EMI Reduction
  • Frequency Spread Spectrum (FSS) to Reduce EMI
  • Precision Enable Threshold to Adjust UVLO
  • Protection Circuitry
    • Overvoltage Protection
    • Cycle-by-Cycle Peak Current Limit
    • Thermal Shutdown

SparkFun Buck Regulator Breakout - 3.3V (AP63203) Product Help and Resources

Buck Regulator Hookup Guide

August 5, 2021

Get started with SparkFun's newest Buck Regulator Boards - the BabyBuck and the Buck!

Core Skill: DIY

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2 Programming

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Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

3 Electrical Prototyping

Skill Level: Competent - You will be required to reference a datasheet or schematic to know how to use a component. Your knowledge of a datasheet will only require basic features like power requirements, pinouts, or communications type. Also, you may need a power supply that?s greater than 12V or more than 1A worth of current.
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