SparkFun Buck Regulator Breakout - 1.8V (AP3429A)

Sparkfun ElectronicsSKU: RB-Spa-2206
Manufacturer #: COM-21338

Price  :
Sale price ¥1,023

Tax included Shipping calculated at checkout

Stock  :

Re-stocking soon See due date

Notify me when this product is in stock

Payments and Security

American Express Apple Pay Google Pay JCB Mastercard PayPal Shop Pay Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.


  • SparkFun Buck Regulator Breakout - 1.8V (AP3429A)
  • Incorporates a 2A step-down DC converter
  • Operates within a 2.7V to 5.5V input voltage range
  • Features a heat management copper pad
  • Offers multiple power connection options
  • Equipped with a red power indication LED

The SparkFun Buck Regulator Breakout - 1.8V (AP3429A) is a sophisticated device that incorporates the AP3429A from Diodes Inc., a 2 A step-down DC converter. This converter operates within an input voltage range of 2.7 V to 5.5 V. The device, measuring 1 inch by 1 inch, is designed to deliver a regulated 1.8 V output, which is managed by an EN (enable) pin.

To manage excess heat, the device is equipped with a 0.6 inch by 0.5 inch copper pad, which allows for the attachment of a heat sink to the bottom of the board.

This full-size buck regulator breakout offers multiple options for connecting input and output power. It includes a pre-assembled screw terminal for temporary connections, the possibility to solder on a barrel jack for an external power supply, and five PTH pins for a more permanent installation.

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

  • 1x SparkFun Buck Regulator Breakout - 1.8V (AP3429A)
  • 1 x 1 inch

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 (2.7 V to 5.5 V)
    • GND - Common Ground
    • VOUT - Power Out (Regulated 1.8 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 to 5.5 V
  • VOUT: 0.6 V to VIN
  • 2 A Continuous Output Current
  • 90 µA 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)

Estimate shipping

You may also like