BQ2002ESNTR

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PMICs, or power management ICs, are an essential part of any electronics device. They control voltage and current levels to ensure that devices operate within their design specifications, and keep them running safely. The BQ2002ESNTR is a PMIC dedicated to Battery Chargers, providing the necessary circuitry and functions to ensure that the battery charger operates properly and safely. In this article, we will be exploring the application field and working principle of the BQ2002ESNTR power management IC.

Application Field

The primary field of application for the BQ2002ESNTR is as a charger dedicated to Li-ion/Li-Polymer battery cells. It is particularly suited for smart phones, which require a combination of power delivery, current limiting and temperature protection in order to ensure the safety and long life of their batteries. The BQ2002ESNTR provides the necessary power management capabilities to provide these features, while also providing a fast charging process in order to maximize the battery lifespan.

The BQ2002ESNTR is also suitable for other portable applications where efficient charging of Li-ion and Li-Polymer battery cells is required. This includes tablets, portable navigation systems, audio and video players, digital cameras, and other portable devices.

Working Principle

The BQ2002ESNTR is designed as an integrated power management IC for Li-ion and Li-Polymer battery cells and provides multiple functions such as charge control, charge current setting and temperature monitoring. It has two main sections; the charger and Power Path Management (PPM). The charger includes a current-mode buck switching regulator that increases the voltage from the adapter port and regulates the output current to the battery. The PPM includes a MOSFET consisting of switches, which are responsible for controlling multiple charging paths.

The BQ2002ESNTR can operate as an automatic switch mode, current mode, or constant voltage/constant current (CV/CC) charger. In automatic mode, the IC will evaluate the battery needs and adjust the charge current and voltage accordingly. In current mode, the IC will limit the maximum charging current to the set maximum level. While in CV/CC mode, the IC will maintain a constant charge voltage until the battery is charged, followed by a constant current until the battery is full. The BQ2002ESNTR also provides two control signals to the system: an immediate end-of-charge (EOC) signal, and a timer end-of-charge (EOC) signal.

Safety Features

The BQ2002ESNTR includes a set of safety features that ensure the safety of the battery cells and the device. It includes an under-voltage lockout (UVLO) circuit that protects the system from input voltages that are too low. In addition, it includes both a timer and a capacitive-based end-of-charge detection that both ensure that the charge time does not exceed the safe levels for the battery cells. There is also an over-voltage protection circuit that limits the voltage between the battery and the charger. Finally, the BQ2002ESNTR includes an overtemperature protection circuit that monitors the temperature of the charger and the battery and terminates the charge if temperatures become too high.

Conclusion

The BQ2002ESNTR power management IC is designed for Li-ion and Li-Polymer battery cells and provides the necessary functions to ensure that the battery charger operates properly and safely. It includes a current-mode buck switching regulator, multiple charging paths, under-voltage lockout, end-of-charge detection, over-voltage protection, and overtemperature protection circuits. These features make the BQ2002ESNTR well suited to powering a variety of portable devices such as smart phones, tablets, navigation systems, audio/video players, and digital cameras.

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