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Lithium-ion Battery Charger Using MCP73831

The MCP73831 is a linear charge management controller IC designed for use in portable devices such as smartphones and tablet computers. It is a highly integrated device that includes a battery charger, system power path management, and a battery fuel gauge all in one package.

The MCP73831 can charge a lithium-ion or lithium-polymer battery using a USB power source or an AC adapter. It includes safety features such as over-voltage and over-current protection, as well as thermal regulation to prevent overheating. Additionally, it has a programmable charge current, allowing for flexibility in charging a wide range of battery sizes and chemistries.

The MCP73831 also includes a battery fuel gauge which can provide the host device with information about the battery's state of charge and remaining capacity. This information can be used to accurately estimate the remaining battery life and to implement power-saving strategies.

This IC is useful for DIY projects and portable devices, since it provides a lot of functionalities and safety features in a small package. It has a small size, and low power consumption, making it perfect for portable devices.

Overall, the MCP73831 is a versatile and efficient charge management solution that can be easily integrated into a wide range of portable devices. It is available in a compact 8-pin package and is fully specified over the -40°C to +85°C temperature range. With the MCP73831, you can reduce the number of external components required and improve the overall performance and reliability of your device.


• 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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