BQ2003S

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BQ2003S Application Field and Working Principle

The BQ2003S is a lithium ion battery charger for portable systems. It is part of the PMIC - Battery Chargers family and is designed for battery charging in cell phones, laptop computers, tablets, and gaming devices. The BQ2003S provides high-efficiency charging and features advanced features such as low battery sense, charge status, charge current, charge voltage, temperature monitoring and over-temperature protection.

Design

The BQ2003S is a single-cell linear battery charger optimized for portable applications. It integrates the required controlled elements needed for a complete charge cycle of a single-cell Li-Ion battery. The design of the device is optimized for low power consumption and excellent thermal performance. The BQ2003S also incorporates a battery temperature monitor and a low-battery sense to provide reliable and safe battery charging.

Features

The BQ2003S provides a complete solution for single-cell Li-Ion and Li-Po battery charge control. The device is optimized for use in low-power applications and includes features such as:

• High-efficiency charge control
• Automatic cell balancing
• Integrated low battery sense
• Charge status, charge current, and charge voltage regulation
• Temperature monitoring and over-temperature protection
• Integrated power switches and battery thermistors
• Programmable charge voltage and battery voltage monitoring
• Integrated over-current and over-voltage protection

Operation

When the BQ2003S is activated, it begins charging by variation of its internal switches and by monitoring the current flowing to the battery. When the voltage reaches the set point, it automatically enters into a constant current state. The device then provides a regulated current to the battery until the set charge current is reached. At this point, the BQ2003S will switch to its constant voltage state and provide a regulated voltage that is maintained until the battery is fully charged. If the battery voltage reaches the preset over-voltage threshold, the device will enter into a protection state and shut down the charge cycle.

The integrated battery temperature monitor allows the device to monitor the battery temperature and adjust the charging parameters accordingly. The device incorporates an over-temperature protection to shut down the charge cycle if the temperature applications rises above the set limit.

The BQ2003S also incorporates a low-battery sense that allows for the charging of depleted batteries. When the battery voltage falls below a certain threshold, the device will enter a pre-charge state and provide a low-current charge to the battery until it reaches the safe voltage target. When the voltage reaches the set point, the BQ2003S will switch to its normal charging routine.

Conclusion

The BQ2003S is a lithium-ion battery charger designed for portable applications. It is part of the PMIC - Battery Chargers family and offers high-efficiency charging and advanced features such as low battery sense, charge status, charge current, charge voltage, temperature monitoring and over-temperature protection. The device is optimized for use in low-power applications and integrates all the elements necessary for a complete charge cycle of a single-cell Li-Ion battery.

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