Gps1

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power managment

  • 3 to 4.2 LiPo (1.3 Ahr
  • will use 4.2V LDO to charge battery - ideally automotive safe
  • Need upower LV cutoff.

Battery charger

  • LT3650-8.2 [[1]]

LCD display

  • 5V @ 1.5mA
  • TPS61220 boost converter - very efficient at lite load

LCD back light

  • 3.8 - 4.2V @ 240mA max
  • LTC3454 - LED driver.


dsPIC supply

  • 3.0V @ upto 100mA + 50mA GPS
  • TPS63030 (buck - boost)
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