BQ2003SG4

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The BQ2003SG4 is a stand-alone advanced Li-ion/ Li-polymer battery charger with safety and advanced monitoring features designed for a wide range of portable applications. It was designed for platforms of 3.6V to 14.4V Li-Ion/Li-polymer batteries with 1 to 4 cells in series. The BQ2003SG4 is a precision battery management IC that monitors every aspect of a Li-Ion/ Li-polymer battery pack and provides accurate charge management for a variety of applications. It is capable of single-cell and multi-cell Li-Ion/Li-polymer battery charging with very low quiescent current, supporting the two popular Li-Ion/Li-polymer charge topologies in defined modes.The BQ2003SG4 is classified as a Power Management IC in the category of Battery Chargers. It provides both flexibility and power savings by using charge termination and input current control, while monitoring the status of key battery parameters and providing various alarm/end-of-charge signals. The BQ2003SG4 offers high-precision voltage regulation and current regulation without the need for external components. It has high noise immunity which allows for reliable operation in noisy environments.The BQ2003SG4 works by monitoring the voltage and current variations at the battery terminals. Its high voltage accuracy ensures that the voltage at the battery terminals remains stable during charge and discharge cycles. Its digital control and advanced, built-in safety features protect the battery from over-current, over-voltage, short circuit, and reverse connection conditions. The BQ2003SG4 utilizes an industry-standard, high-voltage charger connector and allows for simple connection to the battery, making it ideal for both large scale and complex designs.When the BQ2003SG4 is not connected to a battery, it offers a low-power stand-by state of less than 10uA. When a battery is connected, the BQ2003SG4 will monitor the battery characteristics and provide a variety of charging modes. These modes are CCCV (Constant Current-Constant Voltage) and CV (Constant Voltage).In the CCCV mode of charging, the BQ2003SG4 ensures that the input current is limited so that the battery voltage will not exceed the maximum allowed voltage by adjusting the current between a low threshold and the set current limit, maintaining a constant voltage. The CV mode of charging limits the voltage of the battery and maintains the voltage constant. This allows the battery to be charged at a safe, fixed rate and is usually used for trickle charging. The BQ2003SG4 is also able to provide over-charging and over-voltage protection as well as temperature sensing and monitoring.The BQ2003SG4 allows for a wide range of battery charging and monitoring options and is a great choice for designing fast, accurate, and reliable battery solutions. Its high accuracy, wide range of features, and low quiescent current makes it an ideal choice for battery management applications in portable devices.

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