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Lithium-ion Battery Charger Using MCP73831

Hello guys, In this post I a m going to post a tested circuit of a Lithium-Ion Battery Charger that can be used to charge a 3.7V Lithium-ion Battery.

The MCP73831 ICs are highly advanced charge controller IC to be used where space is the main constraint and also a cost-effective solution is required. The MCP73831/2 employs a constant-current/ constant-voltage charge algorithm with selectable preconditioning and charge termination. The constant constant-voltage regulation is fixed with four available options: 4.20V, 4.35V, 4.40V, or 4.50V, to accommodate new,  emerging battery charging requirements. The constant current value is set with one external resistor.


• Linear Charge Management Controller:

- Integrated Pass Transistor

- Integrated Current Sense

- Reverse Discharge Protection

• High-Accuracy Preset Voltage Regulation: + 0.75%

• Four Voltage Regulation Options:

- 4.20V, 4.35V, 4.40V, 4.50V

• Programmable Charge Current: 15 mA to 500 mA

• Selectable Preconditioning:

- 10%, 20%, 40%, or Disable

• Selectable End-of-Charge Control:

- 5%, 7.5%, 10%, or 20%

• Charge Status Output

- Tri-State Output - MCP73831

- Open-Drain Output - MCP73832

• Automatic Power-Down

• Thermal Regulation

• Temperature Range: -40°C to +85°C

• Packaging:

- 8-Lead, 2 mm x 3 mm DFN

- 5-Lead, SOT-23

Circuit Diagram

MCP73831 3.7V battery charger circuit

  • 5v input is required to charge the battery, must use 3.7v lithium-ion battery.
  • Connect battery on J8 connector.

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