MCP73871T-1CCI/ML

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MCP73871T-1CCI/ML Application Field and Working Principle

The MCP73871T-1CCI/ML is a highly efficient, low power, and long life 1-Cell Li-Ion & Li-Polymer Battery Charge Management Controller IC designed for space constrained mobile applications. It belongs to the PMIC - Battery Chargers category of products. The IC is designed to support several charging parameters such as charge current, charge voltage, pre-charge current and charging safety timers. It includes an integrated temperature monitoring system.

The MCP73871T-1CCI/ML is ideal for a wide range of applications, such as portable devices, consumer electronics and wearables. The part also has extensive self-protection features such as short circuit, overvoltage and overcharge protection. It is greatly preferred because of its integrated features, efficiency, high level of accuracy and power saving capabilities.

Features

The MCP73871T-1CCI/ML supports several input topologies, such as USB and AC adapters and provides various charging safety parameters like charge timeouts and charge currents. It operates over a wide temperature range of -40°C to 125°C and supports a wide input voltage range of 1.8V to 5.5V. It is designed in the highly reliable Microchip 9-lead SOT-23 package.

Working Principle

The MCP73871T-1CCI/ML has an internal key-cycle timer, presetting the charge rate to match the charger input. It has two automatic charging parameters, the Fast-Charge and the Pre-charge parameters. The Fast-Charge Parameters allow the charge current to be set according to the battery thermal and size constraints. This is done to ensure adequate battery charging and protection.

The Pre-Charge Parameters allow the charger to reduce the current limit to a pre-charge current limit for a certain period of time before the charger moves to the fast-charge mode. This ensures that the longer cells are completely charged and prevents overcharging.

The charge current is set to match the input source capabilities as well as the battery size and capacity. The Charge Voltage Limit is set to match the battery voltage, adjustable via external resistor in order to prevent overcharging.

The temperature monitoring is done with an external thermistor connected to an external temperature pin. It is used to monitor the battery temperature and limit the charge current to prevent over-temperature charging.

The MCP73871T-1CCI/ML also has an extensive self-protection features like Short Circuit Detection and Over-Voltage Detection to protect the battery from conditions outside of the device’s operating parameters.

Conclusion

The MCP73871T-1CCI/ML is highly efficient, low power, and long-life Li-Ion and Li-Polymer Battery charge management controller IC designed for space-constrained mobile applications. It has an impressive feature list such as adjustable charge current setting, temperature monitoring, overload/short circuit protection, and pre-charge current limit. Its wide temperature range support and wide input voltage range make it highly desirable in the market.

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