BQ24045DSQT Integrated Circuits (ICs)

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The BQ24045DSQT is an efficient and compact switching-mode battery charger with an integrated power path. It supports a single-cell Lithium-ion/Lithium-polymer battery and is able to deliver up to 500mA of charging current. The BQ24045DSQT is designed to operate over a very wide voltage range of 3.2V to 18V, and is a highly integrated solution for single-cell battery systems.

The application field of the BQ24045DSQT is mainly for small-powered applications such as low power wearables, remote controls, and other applications, where continuous and reliable charging performance is more important than rapidity. The device integrates many of the components required to efficiently charge a battery into a single chip solution, reducing external component count and improving system reliability. The charger can be used in any system that requires power conversion or battery charging.

The BQ24045DSQT is a constant-voltage battery charger with a built-in power path management switch. This device uses a multi-level charge management scheme, where the output voltage is adjusted according to the battery\'s temperature, ensuring safe and optimized charging. The device is able to detect battery charging status and quickly change between charging, discontinue charging, and full charge states, as well as detect over-temperature and over-voltage conditions in the system.

On the working principle side, the BQ24045DSQT is able to adjust its charging current based on the battery\'s temperature and its capacity. The minimum charging current is 100mA, and the maximum is 500mA. The charger is designed to operate from either AC or DC input voltage sources. It uses frequency modulation to control the switching frequency, and the charger features a power path management switch which enables the battery to support the system when the input power is absent. The charger also features reverse current protection and over-temperature protection.

The BQ24045DSQT offers a wide range of features that enable designers to optimize the design of portable and embedded battery-powered applications. Its efficient buck-boost charge management and power path management switch allows it to safely and reliably charge a single-cell Lithium-ion/Lithium-polymer battery. The charger can be used in any system that requires power conversion or battery charging, making it a great choice for mobile and embedded applications.

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