Bucky (buck)

A tiny, powerful open source buck converter board based on TPS62A03ADRLR. 

Specs:

• Tiny 8.5 x 10.8mm PCB
• 2.5V to 5.5V input (suitable for 1S Li-ion or 5V USB-C)
• 0.6 to Vin output
  • set Vout with 1206 size resistor
• 3A max output current
  
  • For Vout ≥3.3V, output current is lower.
    Bucky is thermally limited. Try to keep 
    losses below 750mW for best results.
• 90 - 98% efficient

Usage:

• These regulator boards are cheap, simple modules for quick and dirty builds. Don't expect perfection! 
• Solder a 1206 size resistor to the footprint on the bottom of the PCB to set Vout. With no resistor, Vout is 0.6V.

1V - 133kΩ
1.15V - 97.6kΩ
1.25V - 82.5kΩ
1.5V - 59kΩ
1.8V - 44.2kΩ
2.5V - 28kΩ
3.3V - 19.6kΩ
3.5V - 18.2kΩ

To calculate the resistor value for other voltages, use the following formula:

• The regulator is enabled by default. Connect the EN pin to GND to disable the regulator. 
• Bucky does not need external capacitors. However, some applications may benefit from external electrolytic caps.
• Bucky's output current capability is thermally limited. Try to keep losses below 750mW for best results and lowest temperatures.

PCB designed in KiCAD. Manufactured and assembled by JLCPCB. Tested in New Mexico.

Source: https://github.com/mackieks/bucky