BQ24381DSGRG4

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As an application field, PMIC (Power Management IC) is a type of integrated circuit employed for controlling and operating different parts of power systems within specific electronic devices. A battery management system is a part of PMIC which is generally used to manage battery charging and discharging. BQ24381DSGRG4 is a battery charger with integrated power path and it is particularly designed for portable and industrial applications. BQ24381 provides high power delivery and optimization of capacity usage on Li-ion and Li-polymer batteries. It also has an excellent performance for battery size, also it simplifies end applications.

The BQ24381DSGRG4 functions as an inductive boost converter, which is used for providing a nominal 4.5V - 5.5V output voltage range, supporting Li-ion and Li-polymer batteries from 0.25Ah to 2Ah. This power management IC works with an external FET and flyback transformer in order to step up the voltage up to 8V. It has excellent safety and EMI performance, with current limitation and over-temperature protection. It supports a wide input range (4V to 24V) and provides a thermal impedance of less than 40°C/W (Junction-to-case).

In order to control the BQ24381DSGRG4 power management IC, a system-level microcontroller is used. The microcontroller consists of an Analog-to-Digital Converter (ADC) to allow monitoring of various parameters such as voltage, current, and temperature, as well as Digital-to-Analog Converter (DAC) to set the output voltage level. The microcontroller is connected to the IC through an I2C interface.

The BQ24381DSGRG4 internally contains a maximum power point controller (MPPC). The MPPC adjusts the output voltage depending on the battery’s capacity. This control loop constantly measures the current and voltage of the battery to determine if the output voltage needs to be adjusted. When the MPPC detects that the battery is near its maximum capacity, it will automatically adjust the output of the charge regulator to maintain a safe operating temperature.

The BQ24381DSGRG4 also has various charging methods. It provides constant current and constant voltage charging for Li-ion and Li-polymer batteries. It can also be configured to provide pulse charging, during which a pulse is sent to the battery intermittently instead of a constant current. The duration and frequency of the pulses can be adjusted as per the battery characteristics.

In a nutshell, the BQ24381DSGRG4 is an excellent choice for a power management IC. It is highly versatile and integrates with a broad range of external components, making it ideal for a range of applications such as industrial, automotive and consumer electronics. Its reliable operation, high current rating, and excellent cost-performance ratio makes it well-suited for battery charging and other power management tasks.

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