BQ24232HRGTT

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PMIC - Battery Chargers

The BQ24232HRGTT is a synchronous rectified, current-mode, and switch mode battery charger from Texas Instruments. It uses an advanced synchronous rectified PWM current-mode architecture to provide high efficiency battery charging/overcharge protection for up to three series-connectable single-cell Li-Ion/Li-Polymer batteries such as 3.6 V, 3.7V, 4.2V, and 4.35V. This device is used in a wide range of portable devices such as mobile phones, e-book readers, tablets, digital cameras, and navigation systems.

Features

• High-efficiency, current-mode battery charge control
• Programmable optimized constant current/constant-voltage algorithm
• Automatically detects charge termination conditions
• Charge profiles include pre-charge, fast charge, and top-off
• Bi-directional buck/boost topology mode
• Integrated overvoltage, undervoltage, overcurrent, and short-circuit protections
• Quiescent current as low as 35 μA
• Thermal Regulation
• Communication via I2C/SMBUS

Principle of Operation

The basic operating principle of the BQ24232HRGTT is to control the power transferred between two sources, typically a battery and the wall adapter, while maximising efficiency and safety. The charger operates using a constant voltage/constant current control algorithm which enables the device to maintain a low output current until the battery voltage reaches the limit of the charge profile, then the current increases rapidly until it reaches the set current limit. The device also includes several safety features to protect against overvoltage/overcurrent/short-circuit as well as temperature protection.

Conclusion

The BQ24232HRGTT is a highly integrated, synchronous rectified, current-mode, and switch mode battery charger designed for up to three series-connectable single-cell Li-Ion/Li-Polymer batteries. It is a very efficient charger with low quiescent current and several safety features for a wide range of portable applications.

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