BQ27510DRZT-G2

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The BQ27510DRZT-G2 is a fully integrated high-accuracy fuel gauge IC for single-cell lithium-ion (Li+) and Li-polymer battery packs. It is designed to implement a fuel gauging algorithm, that accurately predicts the remaining battery capacity based on a multi-parameter measurement. The IC includes the Impedance Track™ algorithm, which uses periodic measurement of battery voltage and temperature, and current, to continuously update the battery state-of-charge (SOC) and state-of-health (SOH). This enhances the device’s accuracy and helps ensure the remaining capacity of the battery is accurately determined.

Applications

The BQ27510DRZT-G2 has various applications in the increasing laptop, Ultrabook™ and tablet markets. It is designed to provide full protection for SoCs in single-cell Li+ and Li-polymer battery packs. It is mainly used for mobile products, such as laptop computers, Ultrabooks™ and tablets, but can also be used in other battery-powered applications. In mobile products, the BQ27510DRZT-G2 helps to improve system performance, extend battery life and reduce power saving. It can be used as a Power Management IC (PMIC) or as a standalone fuel gauge for space constrained battery packs.

Working Principle of BQ27510DRZT-G2

The BQ27510DRZT-G2 fuel gauge operates on a combination of two algorithms. The first is the Impedance Track technology, which measures battery voltage, temperature, and current to accurately determine the state-of-charge (SOC) and state-of-health (SOH) of the battery. The second algorithm is the Linear State-of-Charge (LCO) boosting algorithm, which is designed to increase the sampling rate of the Impedance Track algorithm for higher accuracy in battery estimation. The LCO algorithm uses additional information collected from the battery, such as battery state-of-charge and state-of-health, to adjust the sampling rate of the Impedance Track algorithm to further refine the accuracy of the battery estimation.

The BQ27510DRZT-G2 is compliant with the Battery Fuel Gauge Specification (BGFS) version 1.1. This standard requires the use of a sliding ADC window technique, which helps to reduce the amount of data that needs to be stored and retrieved when generating the SOC and SOH estimates. The sliding window technique continuously updates the SOC and SOH estimates without the need for storing and retrieving the required data. This enhances the overall accuracy and helps to conserve memory for other purposes.

The BQ27510DRZT-G2 also features temperature compensation, cell balancing, passive discharge, and cell utilization monitoring. Temperature compensation helps to provide better accuracy in the SOC and SOH estimates by compensating for the effects of temperature on the cell characteristics. Cell balancing improves load sharing among multiple cells by equalizing the individual cells. Passive discharge helps to prevent accidental over-discharge of the battery and ensures that the battery is returned to its fully charged state once discharged. Cell utilization monitoring helps to ensure that the cells are not over-utilized and can help to prevent premature cell failure.

The BQ27510DRZT-G2 also includes a low-power buck/boost converter, which helps to reduce the overall power consumed by the battery pack. The buck/boost converter is configurable and helps to maintain a constant output voltage, regardless of the input voltage or load current. This provides maximum battery efficiency and helps to extend battery life.

The BQ27510DRZT-G2 device includes a Sleep Mode and a hibernation mode, which helps to conserve power when the device is in standby or low-power applications. The Sleep Mode helps to reduce power consumption by allowing the device to enter a low-power mode, while the Hibernation Mode helps to increase power savings by allowing the system to fully shut down. This reduces system power consumption and helps to increase battery life.

Overall, the BQ27510DRZT-G2 is a highly integrated single-cell Li+ and Li-polymer battery fuel gauge IC, designed to provide accurate estimation of battery state-of-charge and state-of-health. It includes a comprehensive list of features that are specifically designed to improve system performance, extend battery life, and reduce power saving.

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