BQ25971YFFT

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The BQ25971YFFT is a highly efficient and compact switch mode battery charger designed to quickly charge single-cell lithium ion batteries while operating using a low power mode. This makes it ideal for applications like wearable devices, mobile phones, and other handheld devices where power efficiency is a key consideration. It can be used with either a common wall power supply adapter or a dedicated battery charger.

As one of the PMIC-Battery Chargers, the BQ25971YFFT has a number of features that make it an ideal solution for fast and efficient charging. Firstly, it supports two-stage charging — constant current (CC) followed by constant voltage (CV) — which allows for quick charging of the battery. It also has an adjustable charge current limit that can be set to suit the type of battery being charged, as well as programmable charging end-of-charge voltage and constant-voltage regulation.

In addition, the BQ25971YFFT also offers an adjustable pre-charge and recharge current limit, along with a low battery detection feature, enabling it to detect when the battery is at a low state, and to decrease the rate of charge to avoid overcharging. This feature also helps to ensure that the battery is always in a healthy and safe state.

Furthermore, the BQ25971YFFT can be integrated with a system-level battery monitor circuit to enable diagnostics, temperature monitoring and regulation, as well as under-voltage and over-voltage protection. This provides system level control over the charging process and ensures that the battery is properly charged and maintained.

At its core, the BQ25971YFFT is based on a flyback topology, and uses a synchronous rectifier with a control block for controlling the flyback transformer switch current waveform. This, in turn, allows for higher charging efficiency and peak current limiting to suit the battery, along with high current protection and over temperature protection.

The BQ25971YFFT also uses pulse width modulation (PWM) for battery charge and discharge control, as well as thermal regulation and system shutdown per battery temperature. Additionally, it also has an automatic charge termination feature that stops the charging process once the battery is full.

Overall, the BQ25971YFFT is an efficient and cost-effective battery charging solution for wearable and mobile devices and other applications. Its efficient design, programmable settings, and built-in safety features make it an ideal solution for fast and reliable charging.

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