BQ2092SN-A311G4

The BQ2092SN-A311G4 belongs to the switch mode battery charging integrated circuit (IC) of power management IC (PMIC). Battery management includes advanced systems for monitoring, controlling, and charging batteries, especially those used in portable devices, until targets with minimum waste of energy. The BQ2092SN-A311G4 is specifically designed for Li-Ion (Lithium Ion) and Li-Polymer battery management when using adjustable wall adapter and USB 2.0 power sources.

The BQ2092SN-A311G4 features high accuracy coulomb counter, autonomous battery temperature sensing (12-bit A/D converter) and National’s patented, eFuse series configuration. This circuit offers an integrated system-level solution to simplify power management design without the need to use discrete components. Furthermore, the adjustable Li-Ion/Li-Polymer charge voltage, adjustable termination current and soft charge enable the design of compact charging systems capable of fast charging, resulting in higher customer satisfaction with the product.

The key area of application of the BQ2092SN-A311G4 includes portable products such as mobile phones, digital cameras, PDAs, and portable media players. The circuit is also suitable for industrial, medical and automotive battery applications.

The BQ2092SN-A311G4 offers a set of easy to use features, such as battery detection, battery temperature sensing and cell parameter optimization. It also includes a wide range of safety features for battery protection, including reverse current protection and cell balancing. The eFuse series configuration also provides accurate current monitoring, such as peak current and average current, without additional sensors.

In terms of its working principle, the BQ2092SN-A311G4 utilizes a control loop, which compares battery voltage to a fixed reference while driving an n-channel MOSFET to regulate current into the battery. When the battery voltage reaches the fixed voltage reference, the device switches off and terminates the charging cycle. Additionally, the BQ2092SN-A311G4 monitors the battery temperature, allowing adjustable termination voltage and input current regulation according to different thermal conditions. When the battery temperature rises to an over-temperature threshold, the regulation device automatically stops charging for temperature protection. This control loop is powered by a reference voltage (VREF), generated from the internal band gap voltage reference.

Other features of this circuit include trickle charging, end-of-charge voltage monitoring, adjustable charging parameters and embedded error status indicator. As mentioned above, the BQ2092SN-A311G4 is equipped with eFuse series configuration, which offers a range of useful features, such as over-voltage, over-temperature and over-current protection.

In summary, the BQ2092SN-A311G4 is an effective Li-Ion/Li-Polymer switch mode battery charging IC from the power management IC family. It provides a set of useful features that facilitate the design of reliable and safe Li-Ion and Li-Polymer battery charging systems used in portable products, industrial, automotive and medical applications.