BQ24038RHLRG4

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BQ24038RHLRG4 Application Field and Working Principle

The BQ24038RHLRG4 from TI is a Battery Manager device optimized for USB/AC charger applications. It integrates USB OTG charge control, charge termination, input current regulation, adapter/charger current regulation, and adjustable current to maximize integrated efficiency in Li-ion and Li-polymer battery chargers. This device features reverse current protection and thermal regulation switch to protect the battery when charging and maintaining it.

Application Field

The BQ24038RHLRG4 is a highly integrated device used to charge and manage any Li-ion or Li-polymer battery. It is designed specifically to provide industry leading charging efficiency and maximum safety while using a space-saving Pb-free package. This device is optimized for use in USB/AC chargers, portable audio players, MP3 players, and mobile handsets.

Working Principle

The BQ24038RHLRG4 follows a three-step charging process. First, it uses the input current from adapter or charger protection to determine the initial current to charge the battery. Then, it can determine an optimal input charge current by monitoring the voltage of the battery. Lastly, it will adjust the input current to maximize both efficiency and charge time as well as maintain a safe charge level.

The main features of the BQ24038RHLRG4 are the reverse current protection and thermal regulation switch. The reverse current protection prevents reverse charging of the battery. The thermal regulation switch will sense and shut off the charging process if the internal temperature of the device or battery becomes too high. This helps to prevent the occurrence of hazardous situation.

The BQ24038RHLRG4 also offers adjustable BATFET protection, allowing the user to adjust discharge current settings to meet specific system needs. If the battery voltage drops below a certain threshold, the BATFET is turned on to protect the battery in open loop circumstances.

The BQ24038RHLRG4 also has an input UVLO (under voltage lock out) feature. The UVLO acts as a safeguard that will shut off the charger when the input voltage reaches a minimum level. This prevents damage to the device from over discharge.

Conclusion

The BQ24038RHLRG4 from TI is a highly efficient and safe device for charging and managing Li-ion and Li-polymer battery packs. This device features reverse current protection, thermal regulation switch, adjustable BATFET protection, and UVLO protection. The BQ24038RHLRG4 is designed for use in USB/AC chargers, portable audio players, MP3 players, and mobile handsets.

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