BQ26231PWRG4

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The BQ26231PWRG4 device is a battery management integrated circuit (IC) designed for applications such as cell phones and also other low-power, hand-held devices. This device, available in space saving TSOT-23-5 and TSSOP-10 packages, integrates 1-cell Li-ion fuel gauge, system power management, battery charger and protection from overcurrent, over voltage, and over temperature conditions. The BQ26231PWRG4 is the ideal complete power management solution for 1-cell Li-ion/Li-polymer battery applications in various consumer electronic devices.

The BQ26231PWRG4 device\'s fuel gauge provides remaining capacity information to the system using either Voltage-Based Fuel Gauge (VBG) or Impedance Track Fuel Gauge (IT). The device also integrates three current level switches. It uses two configurable current switches to support system power on/off and battery charger current limit control and the other switch will indicate when the battery voltage drop to the predetermined level. In addition to the current level switches, the device also features a 2pps clock driving a foreground policy manager,which is compliant to SBS/PMBus specifications, enabling further battery management features, including data-logging, cell imbalance compensation and flexible cell configuration.

The BQ26231PWRG4 device also works to protect the system from over-current, over-voltage, under-voltage and over-temperature conditions. Thermal shutdown is provided along with an external thermistor for temperature monitoring. This device also has a 15-bit SAR measuring system for fast and accurate results. Its error-correction logic allows for the system to maintain accurate cell voltage and temperature measurements. Moreover, the device has a lightweight, low-processing-load, stand-alone mode to measure system components without the need of a host microcontroller.

The BQ26231PWRG4 device is part of the battery management-based PMIC family, specifically designed for handheld and portable applications. This integrated circuit features 1-cell Li-ion fuel gauging, system power management, temperature monitoring and protection, low voltage protection, and cell imbalance compensation. This device is the perfect combination between the simplicity of a standalone fuel gauge and the performance and flexibility of a complex PMIC, being highly configurable and programmable while offering a low overall footprint.

The working principle of the BQ26231PWRG4 device involves several interconnected elements such as the fuel gauge, the current switches, the policy manager, and the error-correction logic. The first element is the fuel gauge, which provides remaining capacity information, and it can measure either Voltage-Based Fuel Gauge (VBG) or Impedance Track Fuel Gauge (IT). The device also has three current level switches, two of which are configurable current switches to support system power on/off and battery charger current limit control. The third current switch provides indication when the battery voltage drops to a predetermined level. Furthermore, this device has a policy manager compliant to SBS/PMBus specifications which enables further battery management features like data-logging and cell imbalance compensation.

The error-correction logic used in the BQ26231PWRG4 device allows for the system to maintain accurate cell voltage and temperature measurements; the device also features a 15-bit SAR measuring system for fast and accurate results. This integrated circuit also provides protection against over-current, over-voltage, under-voltage and over-temperature conditions and it features a low-processing-load, stand-alone mode to measure system components without the need of a host microcontroller.

In conclusion, the BQ26231PWRG4 device is an excellent example of how PMIC-based solutions can help protect the system from power supply related issues. This integrated circuit packs a variety of features, from a powerful fuel gauging system to current level switches, policy manager, and error-correction logic. It is a great choice for battery management in various consumer electronic applications.

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