BQ7790505PW

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BQ7790505PW Application field and Working Principle

The BQ7790505PW is a battery management IC that belongs to the series of PMIC (Power Management IC), being manufactured by Texas Instruments. It is best suited for use in single-cell lithium-ion battery management systems in portable and consumer applications. It contains a multi-state Fuel Gauge, System & Cell Protection, Safety Timer, Host Interface, Protection Circuit & Data Logging.

Application Field

The BQ7790505PW is designed for use in single-cell Li-Ion or Li-Polymer battery management systems in portable and consumer applications such as laptops, MP3 players, PDAs, digital cameras, digital camcorders and medical equipment. The chip has several safety features that verify the cell’s integrity and health. It contains both hardware and software protection to keep the battery cells from becoming overcharged, over-discharged, short-circuited or subjected to unexpected temperature fluctuations.

Working Principle

Chip operation is based on a combination of analog and digital technologies. The core of the device is a linear battery-monitoring circuit which continually measures the battery’s charge characteristics and transmits the information to an internal microcontroller. The unit’s PowerPath control block is driven by a flexible low-power processor and can be programmed to control charging, discharging, and battery-level shutoff. Additionally, it can be directed to monitor several safety parameters, including cell temperature, state-of-charge, and under-voltage as well as to record events such as low temperature shutdown and over-voltage.

The BQ7790505PW has several self-calibration modules that enable it to automatically adjust its performance over time to eliminate errors caused by process, voltage and temperature variations. The chip also includes a Temperature Measurement Module that allows it to track the temperature of the battery cell, ensuring that its charge/discharge cycle is not too hot or cold. This is especially important in rechargeable Li-ion batteries, which are temperature-sensitive.

The BQ7790505PW also includes an integrated high-current FET (HIFET) driver which enables simultaneous charging and discharging of the battery cell, allowing for fast charging, even during operation. The device’s processor is flexible enough that it can be programmed to cut off charge or discharge if the cell temperature passes a predetermined level.

Conclusion

The BQ7790505PW is designed to be an all-in-one solution for single-cell Li-Ion/Li-Polymer battery management systems in all portable and consumer applications. It monitors the cell’s health and safety, enabling reliable power control and system protection, as well as efficient charging and discharging, maximizing the cell’s lifetime. Additionally, the chip includes several self-calibration features to ensure optimal performance over time.

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