BQ27620YZFT-G1 Integrated Circuits (ICs)

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Power Management Integrated circuits, or PMICs, are used in nearly every device with a battery, or multiple power supplies. The BQ27620YZFT-G1 incorporates a variety of features that make it an ideal PMIC for many applications, including smartphone and tablet designs as well as wearables, IoT, automotive and other battery-powered products. This PMIC integrates overcurrent and overvoltage protection, as well as power-path switching and battery charging features. This article will explain the application field and working principle of the BQ27620YZFT-G1.

Application Field

The BQ27620YZFT-G1 is a high-integrity, multi-functional, compact, system-on-chip (SoC) battery management product. It is packaged in a QFN-8 form factor and offers a full range of features to monitor and protect Li-ion batteries for today\'s high-performance portable systems. Its feature set includes a high-accuracy current and voltage measurement, a temperature measurement system, a temperature switch, a parametric cell measurement, a charge/discharge FET, an analog-to-digital (ADC) converter, an integrated buck regulator, an over-temperature mark, an over-voltage mark, and a sleep mode. The BQ27620YZFT-G1 also incorporates a complete system monitor and power management system that monitors and protects the battery during charge and discharge cycles, while ensuring data is always secure.

The BQ27620YZFT-G1 is designed with extreme flexibility in mind. Not only is it capable of monitoring battery-specific parameters like charge, voltage, current, and temperature, it can also be programmed for specific application requirements. Through the unique command set, users can update register settings and read system status from an external microcontroller. This makes it ideal for various portable product designs such as smartphones, tablets, wearables, and battery-powered Industrial Internet of Things (IoT) devices.

Working Principle

The BQ27620YZFT-G1’s integrated power monitoring system incorporates several components including a temperature switch and a thermal measurement system. The temperature switch allows the battery’s temperature to be monitored and uses this data to adjust the charging current according to the battery’s temperature. This ensures that charging is not too intense or too slow, and that the battery is safely and effectively charged. The thermal measurement system is used to control the temperature during operation and shut down the power path in case of an over temperature situation.

The integrated buck regulator works with a fixed operating frequency to maximize efficiency while minimizing ripple and noise. The buck regulator is also able to adjust its input/output voltage range to support any battery voltage down to 0.5V. Additionally, the buck regulator has a built-in overvoltage protection mechanism to ensure safe operation.

Another important feature of the BQ27620YZFT-G1 is its support for the cell connection hierarchy (CCH). CCH is an advanced algorithm that allows for optimal power distribution between the cells in a battery and ensures a stable energy output. This ensures no single cell is overcharged or depleted and that charge currents are properly balanced throughout the bank of cells.

The BQ27620YZFT-G1 is also able to monitor the battery\'s state of charge and its cell voltage during constant voltage and constant current charging. During charging, an ADC monitors the battery’s electrical parameters and the internal charge FETs provide protection against overcharge and overdischarge. The integrated Analog-to-Digital (ADC) converter also allows for low voltage operation, cell voltage monitoring, and continuous sampling of battery and signal integrity.

Finally, the BQ27620YZFT-G1 is equipped with a sleep mode to conserve power and extend the battery life. When the system is in sleep mode, the battery can be monitored and managed without impacting the system\'s performance. This allows for dynamic power conservation and ensures the system conserves power until the user needs it.

In conclusion, the BQ27620YZFT-G1 is a highly-integrated and powerful PMIC designed for use in a wide range of battery-powered applications, including smartphones, tablets, wearables, and other IoT products. It features a wide range of features to monitor and protect Li-ion batteries, including temperature switches, current and voltage measurement, and a complete system monitor and power management system. Additionally, the integrated buck regulator and CCH algorithm in the BQ27620YZFT-G1 offer optimal power distribution and efficient, stable energy output. Finally, the integrated sleep mode helps to conserve power and extend the life of the battery.

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