SparkFun BabyBuck Regulator Breakout - 3.3V (AP63203)

Who doesn't occasionally need power regulation? We certainly do, so we've designed the SparkFun BabyBuck 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 0.4in by 0.5in board.

Unlike it's sibling, the BabyBuck sacrifices power option flexibility for space. Don't worry, though, because you can still use the plated through holes for input and output power. With some simple right-angle headers, you'll be up and running in no time.

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.

  • Low-Profile Footprint
  • 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 BabyBuck 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: Soldering

This skill defines how difficult the soldering is on a particular product. It might be a couple simple solder joints, or require special reflow tools.

1 Soldering

Skill Level: Noob - Some basic soldering is required, but it is limited to a just a few pins, basic through-hole soldering, and couple (if any) polarized components. A basic soldering iron is all you should need.
See all skill levels

Core Skill: Programming

If a board needs code or communicates somehow, you're going to need to know how to program or interface with it. The programming skill is all about communication and code.

2 Programming

Skill Level: Rookie - You will need a better fundamental understand of what code is, and how it works. You will be using beginner-level software and development tools like Arduino. You will be dealing directly with code, but numerous examples and libraries are available. Sensors or shields will communicate with serial or TTL.
See all skill levels

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.
See all skill levels


Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • adam.g / about a year ago / 1

    Potential users, please be aware the quiescent draw is not 22 µA. It is approximately 130 µA with no load, and when disabled scales with the input voltage up to 320 µA.

  • Member #387567 / about a year ago / 1

    A LiPo/LiIon battery has a nominal output of 3.7V. Will this regulator work with one? It seems that 3.8V as the minimum input was a poor design choice.

  • Member #815726 / about 3 years ago / 1

    When are you folks going to bring back the 3.3 and 5 volt step up converters (NCP1402)? I used a bunch of those for projects powered by 1 and 2 cell battery packs. Very useful. Don't know why you retired them.

    • CF / about 3 years ago / 1

      The NCP1402 was discontinued so we couldn't make those anymore but I agree that we need to come up with a replacement for those. :-)

  • adam.g / about 3 years ago / 1

    Super cute! Is there a 5V big brother with the AP63205 in the works?

Customer Reviews

4.7 out of 5

Based on 3 ratings:

Currently viewing all customer reviews.

Works great

Small, efficient and replaces one about 3 times bigger and saves a few milliamperes

Works great!

I needed to be able to control power to sections of an IoT device I'm working on. It's in the breadboard stage of development. This device handles it very well. Using the enable pin I can power up and power down individual parts of the device with an available GPIO pin. That ability saves lots of battery power...

So easy to get 3.3VDC in the wild

Surrounded by 12VDC solar and battery systems and I need a solid 3.3VDC for a small radio system. Build a regulator?Hack a cigarette USB phone charger up and work with 5VDC? No just throw one of these in and your problem is solved!