BQ24123RHLR

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Power management integrated circuits (PMICs) are electronic circuits that track and manage the amount of power that is delivered to electronic devices. The BQ24123RHLR (hereafter referred to as the BQ24123) is a PMIC specifically designed to manage and charge Lithium-Ion and Lithium-Polymer battery systems. It is a high-performance integrated battery charger that is well suited for use in space-constrained, low-power applications.

The BQ24123 is part of the Power Management Integrated Circuit (PMIC) - Battery Chargers family, a comprehensive range of power management solutions for portable and wireless applications. The BQ24123 is specifically designed to provide a reliable, efficient, and cost-effective way to charge and manage Li-Ion and Li-Polymer batteries. It is capable of both linear and pulse-width modulation (PWM) charging off an external power supply or a battery pack, enabling safe, fast, and accurate charging. In addition, it has built-in protection against over-voltage, over-current, and over-temperature, which helps to ensure safe and reliable battery operation.

The BQ24123 is a highly integrated device that provides a complete battery charging solution in applications such as mobile phones, Personal Digital Assistants (PDAs), cameras, portable media players, Bluetooth devices, and other space-constrained applications. It is one of the most versatile ICs on the market and can be used to design the most cost-effective, efficient, and reliable charging systems for Lithium-based battery packs.

The BQ24123 is typically powered from an external power source (usually 4.2 V), and includes a synchronous buck converter with a maximum rated current of 0.5 A. The output voltage is configured as a fixed 4.2 V, and can be adjusted as needed via an internal voltage divider. The device includes an integrated voltage detector which monitors the battery pack voltage and protects the system from over-voltage conditions. The device also features an integrated battery temperature monitor, allowing the device to protect against over-temperature conditions. Additionally, the device includes two fault detection schemes: Reverse volt, which detects reverse battery conditions, and POK, which detects the presence or absence of an external power source.

The BQ24123 has several modes of operation, including Constant Voltage, Constant Current, and Sleep Mode. In Constant Voltage Mode, the BQ24123 supplies a fixed output voltage of 4.2 V to the battery, while gradually reducing the output current and shutting off when the current drops below a certain setting. In Constant Current Mode, the BQ24123 supplies a fixed output current to the battery, while gradually increasing the output voltage and shutting off once the voltage reaches a pre-set limit. In Sleep Mode, the output voltage and current are both zero, saving power for shorter battery charging times.

The BQ24123 also includes a variety of safety features, such as short circuit protection, over-voltage protection, over-current protection, and over-temperature protection. The over-voltage protection will shut down the device if the output voltage exceeds the programmed limit to prevent damage to the battery. The over-current protection will limit the output current to the programmed limit to protect the battery from over-charging. Finally, the over-temperature protection will shut down the device if the die temperature of the device exceeds the programmed limit.

In summary, the BQ24123RHLR is a highly integrated PMIC designed specifically for Lithium-Ion and Lithium-Polymer battery systems. It is capable of both linear and PWM charging, and has built-in protection against over-voltage, over-current, and over-temperature. It also offers several modes of operation and several safety features, making it a reliable and cost-effective solution for integrated battery charging systems.

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