Blue Beetle (buck-boost)

A tiny, powerful open source buck-boost converter board based on TPS631000DRLR. 

Specs:

• Tiny 8.5 x 10.8mm PCB
• 1.7V to 5.5V input (suitable for 1S Li-ion or 5V USB-C)
• 1.2V to 5.3V output
  • Vout can be less than, greater than, or equal to Vin
  • set Vout with 1206 size resistor
• ~1.5A max output current
  
  • Max output current varies based on Vin and Vout. 
    See Section 8.2.3 in the datasheet for details.
• Auto-PFM mode for good efficiency at low loads
• 80 - 95% 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.

2.5V - 24.3kΩ
2.8V - 21kΩ
3.0V - 6.19kΩ
4.0V - 5.23kΩ
5.0V - 4.02kΩ
5.5V - 3.65kΩ

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. 
• Blue Beetle does not need external capacitors. However, some applications may benefit from external electrolytic caps.
• Blue Beetle can become thermally limited at high output voltages. Try to keep losses below 500mW for best results and lowest temperatures.

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

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