BQ25871YFFT

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The BQ25871YFFT is a highly-integrated Constant Voltage/Constant Current (CV/CC) battery charger provided by Texas Instruments. It is a highly efficient and cost-effective monolithic power management solution featuring high integration, low power dissipation, and small footprint. The charger caters to the needs of space-constrained applications, featuring the voltage and current comparator, the thermal regulation, and charge regulation functions into a single chip.

Application Field of BQ25871YFFT

The BQ25871YFFT is designed for applications such as smartphones, tablets, cameras, and electronic notebooks. It also works with various battery chemistries, LG 18650, Li-Ion, LiHV, and NiMH batteries. The BQ25871YFFT provides flexible current charging using its programmable charge current up to 2.0A. It also offers preset overvoltage protection and undervoltage lock-out feature for the battery. Moreover, it is designed for 6V-20V power supply voltage and supports trickle charging for dead cells. Another good thing about this device is that it offers over temperature protection, charge termination, and self-detection functions. In addition, the BQ25871YFFT supports access to the condition status with fault registers, enables charge maintenance and battery equalization. It has protection to prevent over-voltage, over-temperature, short-circuit, and over-current.

Working Principle of BQ25871YFFT

The BQ25871YFFT is a Constant Voltage/Constant Current (CV/CC) battery charger that follows the “Increased Efficiency” charging protocol. The CC/CV protocol has two functional modes, constant current and constant voltage. In the constant current mode, the charger sends a constant current to the battery until the maximum charge voltage of the battery is reached. This voltage is usually a factory programmed or user programmed upper limit. In the constant voltage mode, the charger sends a constant voltage to the battery, maintaining it until the expected end-of-charge current is detected. This current is usually a factory or user programmed lower limit. When the current reaches this limit, the charger enters trickle mode, wherein the charger sends a very small current to the battery to supplement any potential losses due to self-discharge.

The BQ25871YFFT also has a high efficiency architecture that reduces the quiescent current and output ripple of the charger. The high step-down efficiency also prevents thermal overload during heavy load operation, allowing more time for charging at a higher peak charge current (PC) setting. The high efficiency design of the BQ25871YFFT greatly improves the system capacity and extends battery life.

Conclusion

The BQ25871YFFT from Texas Instruments is an efficient and cost-effective CV/CC battery charger IC that provides protection against over-voltage and over-temperature, short-circuit and over-current, as well as charge maintenance and battery equalization. It also supports 6V-20V power supply voltage, LG 18650, Li-Ion, LiHV, and NiMH batteries, and offers flexible current charging up to 2.0A. The BQ25871YFFT is a highly integrated solution ideally suited for smartphones, tablets, cameras, and other space-constrained applications.

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