BQ27742YZFR-G1 Integrated Circuits (ICs)

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BQ27742YZFR-G1 is a multi-chemistry battery monitor that develops low quiescent currents and operates from a wide range of input voltages. Its single chip solution for Li-ion and Li-polymer battery packs combines safety features, fuel gauging, and data logging within a small footprint. It is a highly integrated and powerful component in the electronic design of smart medical devices.

PMIC, or Power Management Integrated Circuit, is an all-in-one step that combines current regulation, voltage regulation, and battery management in a single integrated circuit. PMICs are essential components or subsystems in a wide range of electronic products and are used to control and monitor all aspects of power management in a device, including controlling and measuring current, sensing and regulating voltage, and monitoring the condition of the battery. Battery management is one of the key components in power management. This is where the BQ27742YZFR-G1 comes in.

The BQ27742YZFR-G1 is a multi-chemistry battery monitor specifically designed for use with Lithium Ion (Li-Ion) and Lithium Polymer (Li-Polymer) battery packs. It offers advance safety features such as over-voltage, over-temperature, over-current, and under-voltage protection. Additionally, the BQ27742YZFR-G1 integrates gas gauging algorithms, which accurately monitor and report the remaining battery capacity in the pack. It allows users to configure multiple parameters such as charge and discharge currents, over-voltage thresholds, and more through an I2C interface. Moreover, the BQ27742YZFR-G1 highly integrated data logging feature helps in monitoring and recording information throughout the battery life cycle.

The working principle of the BQ27742YZFR-G1 is simple. When the battery pack is connected to a power source, it will be supplied with a certain amount of current, which is called the input current. This input current is monitored and measured by the integrated current sense Amplifier located on-chip. Additionally, the battery pack\'s voltage is monitored and obtained from the integrated voltage amplifier located on-chip. Using the input current and the input voltage, the chip determines the battery pack\'s charge level (when being charged), discharge level (when being discharged), internal resistance, and temperature.

The BQ27742YZFR-G1\'s advanced programmable fuel gauge algorithm integrates a Moore’s Law temperature profiling and a state of charge correction method. The profiler utilizes temperature input to adjust the discharge current and voltage parameters to achieve a more accurate reading of the state of charge. This allows the BQ27742YZFR-G1 to maintain a highly accurate reporting of the remaining battery capacity at all times, regardless of the ambient temperature. The chip also features a highly accurate coulomb counter, which accurately measures the total energy flowing in and out of the battery pack.

The BQ27742YZFR-G1\'s application field is very wide, from smart medical device, to wearables, to portable consumer electronics. It offers the highest levels of accuracy and reliability while consuming very low power and taking up minimal space. Additionally, its high integration level and its diagnostic capabilities make it the perfect choice for battery-powered applications that require utmost safety and precise monitoring of the battery’s conditions.

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