The ISL91831 is a highly integrated, single-cell Li-ion/Li-polymer battery charger IC manufactured by Intersil, now part of Renesas Electronics. It is commonly used in laptops and other portable electronic devices to manage battery charging.
Key features and functions of the ISL91831 IC include:
1. **Single-Cell Charger:** The ISL91831 is designed to charge single-cell lithium-ion (Li-ion) or lithium-polymer (Li-poly) batteries commonly used in laptops and other portable devices.
2. **Programmable Charge Current:** The charge current can be programmed to suit the requirements of the connected battery and the charging environment.
3. **Integrated Power FETs:** The IC integrates power MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) to simplify the charger design and reduce external component count.
4. **Thermal Regulation:** The ISL91831 features thermal regulation to prevent overheating during the charging process, ensuring safe and reliable operation.
5. **Charge Termination:** It includes charge termination features to prevent overcharging of the battery, which can lead to reduced battery life and safety risks.
6. **Battery Voltage Monitoring:** The IC monitors the voltage of the connected battery to ensure that it is within safe operating limits.
7. **Status Indication:** The ISL91831 provides status indication outputs to signal when the battery is charging, fully charged, or if an error condition occurs.
8. **Protection Features:** It includes various protection features such as overvoltage protection, undervoltage lockout, and reverse battery protection to safeguard the battery and charger circuitry.
9. **Compact Size and Low Power Consumption:** Designed for use in portable devices, the ISL91831 is compact and energy-efficient, making it suitable for integration into laptops and other space-constrained applications.
Overall, the ISL91831 plays a critical role in managing battery charging in laptops, ensuring optimal charging performance, battery life, and safety.
