BQ27425YZFT-G1

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A power management integrated circuit (PMIC) is a type of integrated circuit, usually containing a variety of built-in power management, voltage regulation, and protection features, aimed at reducing the total number of components and complexity of circuit design for power management in embedded systems. BQ27425YZFT-G1 is a PMIC device recently released by Texas Instruments. It is a strongly integrated single-cell Li-ion/Li-polymer battery monitor and protector IC that can accurately measure and control the state of charge (SOC) and battery capacity of Li-ion/Li-polymer batteries. This paper describes the application field and working principle of BQ27425YZFT-G1.

The application field of BQ27425YZFT-G1 is mainly for low-power, battery-powered portable systems covering a wide range of products such as cell phones, digital cameras, PDAs, healthcare monitoring systems, and IoT devices. As an energy-rich system, a battery-powered device needs to be alarmed when the battery is over-discharged, over-charged, over-temperature and short circuited, while at the same time staying within the operation and safety requirements to protect both the device and the user. BQ27425YZFT-G1 provides a unique and reliable solution to the requirements of a wide range of battery powered equipment. With its two integrated 16-bit A/D converters, voltage multiplier and a 16-bit sigma delta converter, it can measure battery voltage and current, temperature and also SoC of Li-ion/Li-polymer batteries.

The working principle of BQ27425YZFT-G1 involves three main tasks: battery measurement, SoC estimation, and alarm management. Battery measurement involves the voltage and current measurement of the battery. This is performed by two 16-bit ADC converters and the voltage multiplier of the chip. It then calculates the SoC basing on the measured battery data. The SoC is calculated using Coulomb law according to the current battery charge and discharge. The alarm management activates when the voltage and current of the battery fall outside the converter\'s range or when the temperature or SoC exceeds the preset values.

In summary, BQ27425YZFT-G1 provides a reliable solution to the requirements of low-power, battery-powered portable systems. The working principle of BQ27425YZFT-G1 involves three main tasks, namely battery measurement, SoC estimation and alarm management. By accurately measuring and managing the battery voltage, current, temperature and SoC of Li-ion/Li-polymer batteries, BQ27425YZFT-G1 is able to protect both the device and the user by activating its alarm management system when necessary.

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