SparkFun Buck Regulator Breakout - 3.3V (AP3429A)

Sparkfun ElectronicsSKU: RB-Spa-2203
Manufacturer #: COM-21337

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  • SparkFun Buck Regulator Breakout - 3.3V (AP3429A)
  • Features a 2A step-down DC converter
  • Provides a regulated 3.3V output from a 3.9V to 5.5V input
  • Includes a copper pad for efficient heat management
  • Offers multiple power input/output options for flexibility

The SparkFun Buck Regulator Breakout - 3.3V (AP3429A) is a sophisticated device that features the AP3429A from Diodes Inc. This device is a 2 A step-down DC converter with an input voltage range of 2.7 V to 5.5 V.

The full-size version of the buck regulator boards, measuring 1 inch by 1 inch, is designed to provide a regulated 3.3 V output. This output is derived from an input voltage range of 3.9 V to 5.5 V and is controlled by an EN (enable) pin.

To manage excess heat, the device is equipped with a 0.6-inch by 0.5-inch copper pad. This pad is designed to facilitate the attachment of a heat sink to the bottom of the board.

As a full-size buck regulator breakout, this device offers additional options for connecting input and output power. It includes a pre-assembled screw terminal for a non-permanent connection, the option to solder on a barrel jack for an external power supply, and five PTH pins to create a more permanent installation.

The device also includes a red power indication LED that illuminates when the power output is enabled. The board is designed with four mounting holes compatible with 4-40 hardware.

  • 1x SparkFun Buck Regulator Breakout - 3.3V (AP3429A)
  • 1 x 1 inch (L x W)

Buck Board

  • Three power input/output options:
    • Pre-assembled 4-pin screw terminal
    • Five 0.1 inch spaced PTH pins
    • Four plated slots for a DC barrel jack (input only)
  • Power connections:
    • VIN - Power In (3.9 V to 5.5 V)
    • GND - Common Ground
    • VOUT - Power Out (Regulated 3.3 V)
    • EN - Enable (Pull high to enable the power output)
  • Red, power LED indicator
  • 0.5 x 0.6 inch Plated copper pad (for heat sinks)


  • VIN: 2.7 V to 5.5 V
  • VOUT: 0.6 V to VIN
  • 2 A Continuous Output Current
  • 90µA No-Load Quiescent Current
  • 1 MHz Switching Frequency
  • Protection Circuitry
  • Undervoltage Lockout (UVLO)
  • Input Overvoltage Protection
  • Over Current Protection
  • Cycle-by-Cycle Peak Current Limit
  • Thermal Shutdown (160 °C / 320 °F)

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