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MCP73871-4CAI/ML Application Field and Working Principle

MCP73871-4CAI/ML ( Microchip Technology Inc.’s single-cell, fully integrated Li-Ion/LiPolymer battery charger IC) is widely used in PMIC (Power Management Integrated Circuit) - Battery Chargers. This battery charger provides constant-current/constant-voltage, AC/DC power source, high accuracy charge current, charge status indications and fault protection. The end applications cover mobile devices for consumer, industrial, automotive and medical markets.

Working Principle

The MCP73871-4CAI/ML is a stand-alone device, capable of charging Li-Ion/LiPolymer battery cells from a 4.5 V to 5.5 V input supply. It offers automatic charging current selection with input voltage range from 4.1 V to 5.5 V. The charging current is internally programmed with two external resistors from 500 mA to 2.04 A. It provides both AC/DC power source and has dual control mode to support the input power output.

The charge control is based on the constant-voltage and constant-current charging algorithm. The battery charger reaches maximum programmed current (CC) after the battery voltage reaches the preset voltage (CV). When the CC mode is completed, the output voltage maintains the CV voltage by reducing the current. The battery charger can accurately reach the charging current and target voltage in a few milliseconds. The MCP73871-4CAI/ML has internal protection features including overvoltage, overcurrent, short-circuit protection, reverse current protection and thermal protection.

Main Features and Applications

MCP73871-4CAI/ML includes the following main features:

• • Constant-Current/Constant-Voltage algorithm
• • Charge current options up to 2A (5.5V input)
• • uPWM and C/10 detection
• • Low quiescent current: 35µA
• • Programmable timer to terminate the charge cycle
• • Thermal regulation:
• • Reverse current protection
• • Weight: 0.3g

The MCP73871-4CAI/ML can be used in various applications, such as consumer electronics, wearable products, cars, medical applications (devices like Pacemakers), industrial, audio and power tools.

Conclusion

MCP73871-4CAI/ML is a single-cell, fully integrated Li-Ion/LiPolymer battery charger IC used in PMIC - Battery Chargers. It offers automatic charging current selection with input voltage range from 4.5 V to 5.5 V. It provides both AC/DC power source and dual control mode which makes it suitable for several applications such as consumer electronics, cars, and medical devices.

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