Lithium or LiLiFePO4 Battery Charger, Support 1-3 Series

• Support 1-3 series Lithium or LiLiFePO4 battery to charge:
  • 1x, 2x, 3x, 4.2V lithium battery (set stop voltage to 4.2V, 8.4V, 12.6V)
  • 1x, 2x, 3x, 3.6V LiLiFePO4 battery (set stop voltage to 3.6V, 7.2V, 10.6V)
• Charge Input:
  • Wide Input Voltage: 7.5V to 28V
  • Support to be charged by solar panel, can follow for maximum MPPT point, also can set this function.
  • Also support charger input
  • Up to 5A maximum charge current
• 3 Stage smart charge (similar to TP4056. MCP73831):
  • trickle current charge, set possible on back side.
  • constant-current charge (set by Ics), no need change for default.
  • constant-voltage charge (set by Vfb)
• Charge status LEDs:
  • charging
  • done charging.

Resistor divider for feedback:

• Please notice default Rvfb is 3.3K.
• Change Vfb resistor to set this stop voltage
• All the rest SMD resistors are included in the package.
• Supply VCC should be +2V > Vbat

• Charge Target	Regulation Voltage	Rv_fb voltage feedback resistor selection
  LIFEPO4 1 Series	3.6V	28.7K
  LIFEPO4 2 Series	7.2V	7.5K
  LIFEPO4 3 Series	10.8V	4.02K
  Lithium ion Li+ 1 Series	4.2V	19.1K
  Lithium ion Li+ 2 Series	8.4V	5.76K
  Lithium ion Li+ 3 Series	12.6V	3.3K