BQ24259RGET

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PMIC - Battery Chargers: BQ24259RGET Application Field and Working Principle

Battery chargers are an important component of the power system in small portable devices, and their importance has grown in recent years with the addition of flash memories and more sophisticated microprocessors requiring a constant supply of power. The BQ24259RGET is a 2.5A, high-efficiency, single input lithium-ion/polymer battery charger from Texas Instruments. It is designed to quickly, safely and accurately charge a battery from an AC/DC adapter or USB source.

The BQ24259RGET is designed for simple implementation and offers a number of protective features that helps protect the device and battery. A precise current-limited charging capability allows the precise charge rate setting without necessitating changing external components. The Thermal Regulation Control and Constant On-Time control schemes of the BQ24259RGET help provide a very high degree of protection against overcharging, over-current and over-temperature conditions. This allows the charger to maintain precise charge levels during the entire charge cycle.

BQ24259RGET Application Fields

The BQ24259RGET is mainly designed for smartphone charging applications, tablets and other consumer electronic devices that use lithium-ion or lithium-polymer battery, with charge currents as high as 2.5 amps are possible, without the need for an external power supply. The device is also ideal for automotive applications such as electric vehicles, motorbikes and robots, where the high efficiency and robustness of BQ24259RGET is required.

BQ24259RGET Operating Principle

The BQ24259RGET uses voltage regulation loop feedback and current regulation loop feedback to control the charging process. The device accurately regulates and limits the current, while keeping the battery voltage precisely regulated. The charging process is automatically stopped once the current reaches the programmed threshold. In addition, the device can be said to use a constant voltage (CV) / constant current (CC) charging algorithm to charge the battery with a uniformly decreasing voltage and lower current.

The BQ24259RGET offers a low-ripple charge current and low-ripple input current. Additionally, the device can be configured using the two independent pins - STAT and EN. The device also offers over-temperature protection, over-voltage protection and over-current protection. All these features combined make the BQ24259RGET an ideal charging solution for any application.

Conclusion

The BQ24259RGET is a high-efficiency, single-input lithium-ion/polymer battery charging solution from Texas Instruments. The device provides high levels of reliability and safety, and is capable of charging a battery at up to 2.5A. This makes the device an ideal solution for a wide variety of small portable devices and automotive applications.

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