BQ25040DQCT

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Power management integrated circuits (PMICs) are integrated circuit devices that help manage power and current flow in a variety of applications. Battery chargers are available in a range of options depending on the adaptability and performance needs of the application. BQ25040DQCT is one such product from Texas Instruments which can be used for battery charging in applications such as mobile phones, tablets, portable Bluetooth speakers, and digital cameras.

The BQ25040DQCT is an integrated single-chip stand-alone thermally regulated Li-Ion/Li-Polymer Battery Charge Management System. Its low external component count makes it a highly recommended solution for space-constrained applications. It uses direct-charged battery technology to charge a single-cell Li-Ion/Li-Polymer battery from an AC adapter or USB port.

BQ25040DQCT has two operating modes - Bulk Decharge (BD) and Preconditioning (PC). In Bulk Decharge mode, the device enables the charging current until the set end-of-charge (EOC) condition is met. When this occurs, the device reduces the current and illuminates the red LED. In Preconditioning mode, the device preconditions the battery with no current or trickle-charge under low-voltage conditions. Preconditioning helps to prevent frequent failed chargings, and improves the charging performance for long-term storage batteries.

The working principle of BQ25040DQCT is based on charge termination and charge regulation circuitries. The termination circuitry consists of a voltage sensing circuit and a current sensing circuit. The voltage sensing circuit senses the battery voltage and provides the charge termination signal at the end of a full battery charge, while the current sensing circuit control the constant current charging. The charge regulation circuit controls the output of the charge current based on voltage and current information feedback from the sensing circuits. The charging is monitored and regulated by a combination of the input voltage, battery voltage, charge current and temperature.

BQ25040DQCT’s smart charge architecture, high-efficiency and accuracy make it ideally suited for a wide range of mobile and consumer electronics applications. It provides an adaptive current level based on the external USB port or AC adapter input. With thermal regulation and maximum input voltage protection, BQ25040DQCT is a reliable solution for ensuring a safe, efficient and compliant charge for single-cell Li-Ion/Li-Polymer battery systems.

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