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Battery Charger: LTC4010

  • for best reliability, input voltage should be (2V*n_cells)+0.3V = ~21V


Undervoltage Protection: LT6703-2

  • 1.4-18V voltage comparator with built in reference
  • V- pin exposed, will output a logic 1 if input < reference
  • low current draw, ~6.5uA
  • open collector output, will likely need FET driver


Boost Converter: TPS55330

  • 12V to 21V boost converter
  • 1.5A output current


Load Switch:

  • 2A


OR Gate:



System Block Diagram:

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