SparkFun
SparkFun Buck Regulator Breakout - 1.8V (AP3429A)
The SparkFun 1.8V Buck Regulator Breakout features the AP3429A step-down DC-DC converter, providing a regulated 1.8V output at up to 2A continuous current fr...
The SparkFun 1.8V Buck Regulator Breakout features the AP3429A step-down DC-DC converter, providing a regulated 1.8V output at up to 2A continuous current from a 2.7V to 5.5V input. An enable pin allows the output to be switched on and off programmatically.
The 1" × 1" board offers multiple power connection options: a pre-assembled screw terminal, PTH pins for permanent installation, and plated slots for a DC barrel jack input. A red LED indicates when power output is enabled, and a copper pad on the bottom accommodates a heat sink.
Key Features
- 1.8V Regulated Output – 2A continuous from the AP3429A
- Enable Pin – Software-controlled output switching
- Multiple Input Options – Screw terminal, PTH pins, or barrel jack
- Power LED – Red indicator when output is active
- Heat Sink Pad – 0.5" × 0.6" copper pad on bottom
- Mounting Holes – 4× 4-40 compatible
Specifications
- IC – AP3429A (Diodes Inc.)
- Input Voltage – 2.7V to 5.5V
- Output Voltage – 1.8V regulated
- Output Current – 2A continuous
- Quiescent Current – 90µA (no load)
- Switching Frequency – 1MHz
- Protection – UVLO, input overvoltage, cycle-by-cycle current limit, thermal shutdown (160°C)
- Board Size – 1" × 1" (25.4 × 25.4mm)
Pin Connections
- VIN – Power input (2.7–5.5V)
- GND – Common ground
- VOUT – Regulated 1.8V output
- EN – Enable (pull high to enable output)
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- DC barrel jack
- A round power connector commonly used for low-voltage DC power supplies, often described by its outer and inner diameters such as 5.5 x 2.1 mm. Matching the barrel size and polarity is important so the plug physically fits and powers the device correctly.
- LED
- A light-emitting diode is a small electronic component that lights up when current flows through it in the correct direction. In this kit, LEDs create the flashing effect, so polarity and correct soldering matter for the project to work.
- PTH
- Plated through-hole means the pin holes are metal-lined so solder connects the pad on both sides of the board. It is useful for connectors and headers that need a strong mechanical and electrical connection.
Find this product in
Power & Batteries
SparkFun Buck Regulator 1.8V Schematic
Schematic · 94.1 KB · Click any page to view full size
AP3429A Datasheet
Datasheet · 629.8 KB · Click any page to view full size
SparkFun Buck Regulator 1.8V Board Dimensions
Mechanical Drawings · 109.6 KB · Click any page to view full size
AP3428 Application Note
Document · 276.6 KB · Click any page to view full size
Supplier page — sparkfun.com
Supplier Description · 726.5 KB · Click any page to view full size
Resources & Downloads
Guides, code examples, and more
Related Tutorials
Free guides on learn.littlebird.com.au
