BQ25872YFFT Integrated Circuits (ICs)

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PMIC - Battery Chargers refers to a type of integrated circuit that is mainly used to charge and maintain the expected voltage level of rechargeable lithium-ion, nickel-metal hydride, lead acid and other types of batteries. Specifically, the BQ25872YFFT, is a highly-integrated standalone switch-mode linear best battery charger for single- or dual-cell Li-Ion batteries. It uses its precise current, voltage, and temperature regulation to charge batteries of various sizes, ranging from 200 mAh to 5Ah.

The BQ25872YFFT has a wide range of applications given its built-in safety and protection features, such as a reverse current protection and overcurrent protection, high accuracy current regulation, and temperature regulation. Its single-cell charging current can go up to 5A and dual-cell charging current can go up to 3A. Furthermore, it supports traditional pre-charge for better cell protection. Therefore, the BQ25872YFFT is suitable for applications such as intelligent home appliances, wearables, portable medical equipment, hand-held terminals, drones, 3C products, and wearable healthcare devices.

The BQ25872YFFT works on a switching power converter architecture. It adapts to different input voltage sources, such as a USB Type-C, AC adapter, and non-idle charging adapter. The main operational blocks of the BQ25872YFFT include the battery charger, a high-accuracy voltage sensor, an input current limit, a thermal-shutdown, an adaptive voltage clipper, a system status register which can be used to monitor the device status, overcurrent protection, a reverse current protection, a maximally allowed voltage limiter, and more.

At the input end, the BQ25872YFFT can automatically identify different input voltages and set different current thresholds to limit input current and reduce power losses. Then, at the output end, the BQ25872YFFT converts the input voltage to the desired output voltage and current, using a switching power conversion circuit, to provide the necessary charging power for the battery. Additionally, it uses output current to monitor current slew rate and allows for an output current peak during the non-idle period. Its adaptive voltage clipper also provides a safe charging path to the battery, by mapping the battery’s voltage profile and limiting the charge current for that specific battery.

To ensure efficient and safe operation of the battery, the BQ25872YFFT includes thermal shut-down and overcurrent protection, as well as reverse current protection, all of which detect irregularities in operating temperature and current flow, respectively, and shut down accordingly. It also has a maximally allowed voltage limiter to prevent overvoltage disruption, a system status register to monitor the device’s performance, and a built-in OVP relay, as well as an overvoltage circuit breaker, to provide further protections against overvoltage.

In conclusion, the BQ25872YFFT is a highly-integrated, intelligent battery charging solution, that offers comprehensive protection features for Li-Ion batteries and various other types of rechargeable batteries for applications such as intelligent home appliances, wearables, and 3C products. Its advanced features, such as high-accuracy current regulation, temperature regulation, and adaptive voltage clipper, enable it to offer maximum safety and efficiency to battery charging.

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