BQ27500DRZR-V100G4

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Power management integrated circuit (PMIC), also known as multi-channel or multi-channel power management unit (PMU), is an integrated circuit (IC) in modern portable electronic devices that provides various power supplies for various devices inside the mobile device and helps to reduce the size and number of external power supplies. Battery management is a part of power management integrated circuit, which mainly deals with the management of battery parameters and the realization of the charging and discharging of battery. Among the various lithium battery management integrated circuits, BQ27500DRZR-V100G4 has a wide application field and its working principle is simple and reliable.

Application Field

BQ27500DRZR-V100G4 is a single-cell Li-ion/LiFePO battery fuel gauge IC, used in rechargeable systems to safely measure battery capacity and accurately estimate run time remaining. This IC housed in a small 8-lead, low-profile (1mm), space-saving DFN package and it is specifically designed for low-voltage single-cell Li-ion/LiFePO batteries, with typical applications in the following industries:

• Automotive: electric cars, hybrid electric vehicles, electric motorcycles, electric bicycles, etc.
• Consumer electronics: smartphones, PCs and mobile computing devices, portable medical systems, digital cameras, portable gaming devices, etc.
• Industrial: portable instruments, remote sensors, automatic meters, remote telecommunication systems, portable power systems and UPS, etc.

Working Principle

The BQ27500DRZR-V100G4 battery fuel gauge uses a proprietary integrated circuit (IC) and firmware to implement several embodiments of a System-on-Chip (SoC) approach to measure the battery fuel level and durability. The device includes several embedded functions. The device is mainly used to report the state-of-charge (SoC) and remaining capacity in terms of total charge, sense the cell temperature, detect the presence of an external charger, and alert the host controller of a low-battery state.

The device has one main measuring element — a so-called Coulomb Counter — that is used to measure the state-of-charge (SoC).This is done by measuring the amount of charge that is exiting or entering the battery through two pins, one positive and one negative.The SoC is calculated by integrating the current flowing through the pins, i.e. measuring the amount of charge that is entering the battery over a certain period of time. The Coulomb Counter is also used to report the battery\'s remaining capacity in terms of total charge.

The device also includes a temperature sensor that is used to measure the temperature of the cell. This information is used to estimate the remaining capacity of the cell based on the temperature of the cell. The device also includes a charging detection circuit that is used to detect the presence of an external charger connected to the battery. This is used to adjust the SoC calculation to account for any charging or discharging of the battery when it is connected to the charger.

Finally, the device includes an alert circuit that is used to generate an alert signal when the SoC of the battery is below a certain threshold level. This alert signal is sent to the host controller, which can then take the appropriate steps to protect the battery from over discharging or other damaging conditions.

In summary, BQ27500DRZR-V100G4 is a single-cell Li-ion/LiFePO battery fuel gauge IC with wide application field, which integrates multiple functions such as Coulomb Counter, temperature sensor, charging detection circuit, and alert circuit. It is used to safely measure battery capacity and accurately estimate remaining run time, to report the state-of-charge (SoC) and remaining capacity in terms of total charge, to sense the cell temperature, to detect the presence of an external charger, and to alert the host controller of a low-battery state.

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