BQ24109RHLR

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PMIC (Power Management IC) is a kind of microchip that integrates both current and voltage regulation, protection and monitoring functions. Battery chargers are one of the most important parts of the PMIC family. The BQ24109RHLR is a reputable advanced battery charger IC which is typically used in portable applications. This article will discuss the applications field and the theoretical working principles of the BQ24109RHLR.

Applications Fields of BQ24109RHLR

The BQ24109RHLR is primarily designed for portable applications where space requirements are often tight. It is fit for wearables, industrial electronic devices, portable instruments and handheld devices, to name a few. Electrical items that require high power and high current charging can also make use of this charger IC, such as tablets, notebooks, and smart meters. The IC also has moderate EMI suppression, making it suitable for higher frequency switching mode power supplies, given the appropriate design.

The IC is also quite versatile for a wide range of battery chemistries such as Lithium Ion (Li-ion), Nickel Metal Hydride, Nickel Cadmium and Lead Acid types. This includes both traditional sealed battery packs and 3, 4, 5 and 6-series cell batteries. It is able to supply up to 4A of fast charge capability with a maximum input voltage of 20V DC. The BQ24109RHLR is able to automatically detect the battery-type and then select the appropriate charging profile without any manual reset required.

Working Principles of BQ24109RHLR

The BQ24109RHLR uses a traditional 3-stage charging algorithm for optimum charging and safety protection. First, it enters the constant current charge stage and holds the voltage/current constant. This charging stage is designed to build up the initial charge in the battery. In the second stage, it enters the constant voltage charging stage where it holds the voltage constant and decreases the current. This ensures the battery does not overcharge. The last stage is the charge termination stage, where it maintains a constant voltage until the current reaches its minimum threshold.

The BQ24109RHLR also features a low battery indicator, as it utilizes a highly accurate under-voltage lockout to determine battery status. When the battery becomes depleted and its voltage falls below the factory set voltage, the charger will shut down and enter a low battery indicator mode, thus preventing further draining of the battery. Finally, the IC also includes a temperature-compensated safety timer to make sure that the battery does not stay in the charge stage for too long, in order to protect the battery form over-charging.

Conclusion

The BQ24109RHLR charger IC is an ideal choice for portable applications that require high power and high current charging. Its 3-stage charging algorithm ensures batteries are charged safely, while its integrated low battery indicator is a great feature for protection. Additionally, its temperature-compensated safety timer is another layer of safety for the battery. All these features make the BQ24109RHLR an excellent power management solution for a wide range of battery chemistries.

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