simple boost step-up power board


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  • charges lithium ion batteries to 4.2V
  • 8mA standby current
  • over-temperature protection circuit
  • red LED flashes while charging, red LED solid when charged
  • input voltage range: 3.7V to 5.5V
  • charging and output current: 1A max
  • output voltage: 5V
  • under-voltage protection at 2.9V
  • 85% efficiency at 3.7V output with 5V/1A (USB standard) input