BQ2057TTSTR

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PMIC - Battery Chargers

A battery charger, or recharger, is a device used to put energy into a secondary cell or rechargeable battery by forcing an electric current through it. The most common forms of battery chargers are car battery chargers, computer battery chargers, and AA battery chargers. The BQ2057TTSTR is a battery charger from Texas Instruments specifically designed for use in power management and battery charging applications.

The BQ2057TTSTR is a highly integrated device for pocket, tablet, and Industrial Portable (IP) applications. It is designed to charge 1 to 5 battery cells Li-Ion, Li-Polymer, or Nickel-Metal Hydride (Ni-MH) batteries. As a programmable linear charger, it offers architecture and features to support a wide range of charging configurations and customer specific applications.

The BQ2057TTSTR charger offers an integrated programmable timer, current monitor, voltage monitor and temperature monitor. It\'s designed to provide simple, low-cost solutions to recharge any 1-5 Li-Ion, Li-Polymer, and Ni-MH cell configurations up to 4.3V. It comes with preset programme and safety features, including adjustable charge termination, cycling for Li-Ion, complete short circuit and reverse battery conditions, and battery temperature monitoring.

Features and Specifications

The BQ2057TTSTR features a wide input voltage range, adjustable charge current and charge termination current, cyclic refresh for Li-Ion batteries, internal short-circuit and reverse battery protection, and flexible programmability via I2C interface. Its operating input voltage ranges from 4.5V to 28V, allowing independent charging from multiple sources such as mains and solar. It supports charge currents up to 400mA, and the adjustable charge termination current allows a soft start of the charging cycle and extends the battery life. It has an integrated timer, current monitoring unit, voltage monitoring unit and temperature monitoring unit.

In terms of safety, the BQ2057TTSTR provides complete short circuit and reverse battery protection, and temperature monitoring to ensure safe operation. It also has under-voltage protection to prevent over-discharging of the battery. The device is designed to have no loss of battery capacity when compared to traditional linear chargers, plus the programmable parameters offer an adjustable charge termination current to help extend battery life.

Applications

The BQ2057TTSTR is well suited for portable and mobile devices, such as mobile phones and tablets, consumer electronics, wearable devices, medical equipment, and IoT devices. It is also suitable for industrial/commercial applications such as electric vehicles, surveillance systems, battery packs, and portable instrumentation.

Working Principle

The BQ2057TTSTR is a programmable linear charger designed to support 1 to 5 Li-ion, Li-Polymer, and Ni-MH cell configurations up to 4.3V. It uses a regulated current source to charge the battery to a programmed voltage level, with over-current, over-voltage, and reverse battery protection. During charging, the current is monitored by the current monitor unit. When it reaches the programmed charge current, the device begins to reduce the charge current as the battery approaches its final voltage set point.

The timer is used to terminate the charging cycle when the timer reaches a preset value. The voltage monitored unit monitors the battery voltage. When the voltage reaches the constant voltage set point, the current is then reduced by the current monitor unit. If the voltage drops below the constant voltage, the unit resets the timer and starts the charging cycle again. The temperature monitor unit prevents the charger from operation when the battery temperature exceeds the programmed limit.

Conclusion

The BQ2057TTSTR from Texas Instruments is a highly integrated programmable linear charger for pocket, tablet, and Industrial Portable (IP) applications. It is suitable for 1-5 cell Li-Ion, Li-Polymer, and Ni-MH cell configurations up to 4.3V and is designed to provide simple, low-cost solutions to recharge batteries. It offers an adjustable charge termination current, cyclic refresh for Li-Ion batteries, internal short-circuit and reverse battery protection, and temperature monitoring to ensure safe operation. It is well suited for use in portable and mobile devices, electric vehicles, surveillance systems, and other battery powered applications.

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