The SparkFun 3.3V Buck Regulator Breakout features the AP3429A from Diodes Inc., a 2A step-down DC-DC converter with an input voltage range of 2.7V to 5.5V. This full-size, 1in. x 1in. version of our buck regulator boards is configured to provide a regulated 3.3V output (from a 3.9 to 5.5V input voltage range), which is controlled by an EN (enable) pin. To dissipate excess heat, a 0.6in. x 0.5in. copper pad is provided to attach a heat sink to the bottom of the board.
As a full-size buck regulator breakout, additional options for connecting input and output power are available. There is 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. Our full-size buck regulators also come with a red, power indication LED that light up when the power output is enabled. This board has four mounting holes compatible with 4-40 hardware.
Features:
Buck Board:
- 1in. x 1in. PCB layout
- Three power input/output options:
- Pre-assembled 4-pin screw terminal
- Five 0.1in. spaced PTH pins
- Four plated slots for a DC barrel jack (input only)
- Power connections:
VIN - Power In (3.9V to 5.5V)GND - Common GroundVOUT - Power Out (Regulated 3.3V)EN - Enable (Pull high to enable the power output)
- Red, power LED indicator
- 0.5in. x 0.6in. Plated copper pad (for heat sinks)
AP3429A:
- VIN: 2.7V to 5.5V
- VOUT: 0.6V to VIN
- 2A Continuous Output Current
- 90µA No-Load Quiescent Current
- 1MHz 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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