MCP73864T-I/SL

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The MCP73864T-I/SL is a power management integrated circuit (PMIC) for battery charging applications. This device is a single-cell battery charger and power path management unit that supports multiple charging profiles for different types of battery chemistries. It combines high efficiency charge control, programmable input power regulation and thermal control functions in a small, low cost package. The MCP73864T-I/SL is designed to maximize battery performance and lifetime while minimizing power dissipation. The device also contains multiple safety features to protect the battery and charger.

Application Field
The MCP73864T-I/SL is ideal for applications requiring a high performance and efficient charging device such as cell phones, digital cameras, notebook PCs, PDAs, and a wide variety of portable new generation devices.

Working Principle
The core of the MCP73864T-I/SL is a buck converter. The buck converter regulates the voltage and current to the battery by switching power transistors. The device operates in one of several preset charging profiles for different types of batteries. The charging profile is selected by the user through external components connected to the MCP73864T-I/SL inputs and is optimized for different battery chemistries.

The MCP73864T-I/SL contains three separate process control loops to enable tight regulation of the input voltage, full-load current, and temperature. The device is powered from an input voltage supply, which can range from 4.5V to 19V. A precision, temperature-compensated voltage reference and comparator circuit sets the voltage regulation points. The battery current is regulated through an inner current-loop regulator, and the external current-sense feedback sets the regulation points. A built-in temperature sensor can be used to detect an abnormal temperature condition and turn off the converter if necessary.

The MCP73864T-I/SL also includes a thermal monitoring and protection circuit. This circuit monitors the device temperature and shuts down the regulator if the temperature exceeds a factory-programmed value. When the temperature drops below a pre-determined value, the device will re-start the regulator.

The device also includes overvoltage and reverse current protection. This is done using integrated n- and p-MOSFETs in order to limit any additional power loss during the protection. A low-dropout current regulation loop is used to further improve efficiency.

In conclusion, the MCP73864T-I/SL is an integrated power management solution for battery charging applications. It is designed to offer high efficiency, extended battery life, and thermal protection for applications such as cell phones, digital cameras, notebook PCs, PDAs, and a wide variety of portable new generation devices.

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