SparkFun Buck Regulator Breakout - 1.8V (AP3429A)

The SparkFun 1.8V 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 1.8V output, which is controlled by an enable (EN) 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 lights 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 ground
• VOUT - Power out (regulated 1.8V)
• 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).