BQ25898YFFR Integrated Circuits (ICs)

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Power management integrated circuit (PMIC) is a commonly used device in electronics, and it plays an important role in controlling the voltage, current and power of the power supply in various applications. PMIC can be further divided into different types, like buck converters, battery chargers and so on. In this article, we will mainly focus on battery charger and the application field and working principle of BQ25898YFFR.BQ25898YFFR is an integrated circuit designed for multiple battery charging applications based on innovative Qualcomm Quick Charge technology. The device has a high-power 4.3-A switching charger, a USB current path controller, 9-V/3-A input current limit, and 180-mΩ series sense FET solutions.

In terms of application field, BQ25898YFFR is suitable for portable applications such as smartphones, tablets and notebook PCs. It is well-known for its ability to charge up to four cells quickly, with maximal charging current up to 4.6 A. It features fast charging for all battery types, including Li-ion, Li-polymer, and LiFePO4. It also provides quick connection protection, so that when it is connected to the system, it can automatically disable the output current path, to protect the system from voltage overshoot.

In terms of working principle, BQ25898YFFR has 9V/3A integrated step-down processor. This converter is composed of a power switch and a control circuit, which works by periodically switching the load resistor during the on and off periods. The ON period acts as a current source, while the OFF period acts as a voltage source. The control circuit adjusts the ON and OFF periods to maintain the desired current and voltage.

BQ25898YFFR also provides a precharge function, which is activated when Vbus voltage is lower than a certain voltage. This function allows for quick, safe charging and allows for more efficient power management by automatically switching to a higher current for fast charging.

In addition, BQ25898YFFR provides an Absolute Voltage Regulation (AVR) function, which is a feature that enables the regulator to detect shifts in the input voltage and adjust the output current accordingly. This feature saves capacitors and helps with protection.

BQ25898YFFR also features a reverse-charger and reverse-discharger protection function. Reverse-charger protection activates when the input voltage is lower than the battery voltage and the device automatically shuts off. The reverse-discharger function is a safety measure that prevents a battery from over-discharging, providing extra power-saving protection.

Overall, BQ25898YFFR is a comprehensive PMIC specifically designed for multi-battery charging in either USB, wall adapter, or any other DC input sources. It has an integrated step-down processor with 9V/3A input current limit, and 180-mΩ series sense FET solutions provide fast and efficient charging for all battery types. Furthermore, it offers tailored protection functions such as reverse-charge protection, and absolute voltage regulation, making BQ25898YFFR an attractive and reliable device for multiple battery charging applications.

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