BQ2002TSNTR

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Power management integrated circuits (PMICs) have become popular in modern electronics devices due to their convenience and efficiency. Among the various PMICs, battery chargers have been making strides in recent years in terms of their capability, performance, and power efficiency. The BQ2002TSNTR is a linear battery charger IC, developed by Texas Instruments, suitable for Li-Ion/Li-Polymer rechargeable batteries. It integrates a low quiescent current buck-boost battery charger, which utilizes constant current-constant voltage (CCCV) regulation to efficiently charge batteries. In addition, it features a voltage supervisor device that provides cell balancing for up to four-cell packs, reverse-blocking protection against adverse battery connections, and several safety features.

The BQ2002TSNTR is designed for applications where multiple Li-Ion/Polymer battery cells have to be charged. It supports charging multiple cells with sequence termination and includes a battery temperature sensor in order to ensure a safe charging process. The charger can be configured to charge either one or two cells in series (for 2-cell or 4-cell packs, respectively) and comes in a 3 mm x 3 mm TSN package, which is suitable for applications with space constraints. The BQ2002TSNTR is designed for voltages up to 4.7 V/cell and can charge up to 200 mA/cell.

The BQ2002TSNTR integrates two-levels of charge-control: initial constant-current and final constant-voltage. During constant-current phase, the maximum set battery voltage is the sum of the two specified cell voltages. During constant-voltage phase, the voltage is held at the CV threshold for 4.5 minutes, and then held at the low charge voltage. An end of charge signal is then generated. The charger has an additional feature called top-off, which allows it to continue charging the battery if a low-impedance connection is present across the battery terminals.

The BQ2002TSNTR employs several safety features that improve battery protection. It offers reverse-blocking protection, which prevents current through an accidentally reversed battery and provides an active low clock output to indicate the presence of an appropriate battery connection. It also has overtemperature, overcurrent, and short-circuit protection to ensure that the battery is not damaged during charging. Additionally, the chip can be configured to switch off the internal circuitry if the battery temperature reaches a predetermined level.

In summary, the BQ2002TSNTR is a PMIC designed for Li-Ion/Li-Polymer battery charging applications. It is designed to charge up to four cells in series and features a low quiescent current buck-boost battery charger. The chip implements two-level charge-control and offers several safety features such as reverse-blocking, over-temperature, over-current, and short-circuit protection. It also comes in a small package which makes it suitable for space-constrained applications.

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