BQ24278YFFR

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The Texas Instruments BQ24278YFFR is a highly integrated and economical power-management and battery-charger integrated circuit (PMIC & BC). It is designed to accommodate greater than 90% of the current market Li-ion or Li-Polymer cell count configurations and allows the user to select from a variety of charge current values, charge termination topologies, and charge profiles, including the company’s proprietary iCharge™ algorithm for enhanced charging efficiency. The device is capable of charging up to 2 cells in series and comes in a low profile 6-pin SOT package.

Application Field

The BQ24278YFFR can be used in a wide range of portable devices that require Lithium-ion or Lithium-polymer battery charging, such as cell phones, tablets, e-book readers, MP3 players, cameras, and so forth. It is especially suitable for low-power applications that require smaller form factors and minimal external components. With its wide range of charging topologies, it is also suitable for applications that require multiple charge currents, battery temperature monitoring, and fast charging.

Working Principle

The BQ24278YFFR works by using three stages in the charging process: pre-charge, constant current, and constant voltage stages. During the pre-charge stage, a low current is used to ensure that the battery is not over-discharged. This stage is used to protect the battery from being damaged. The device then passes to the constant current stage, where a fixed current is applied to the battery until it reaches a predetermined voltage level. Once the voltage level is reached, the device enters the constant voltage stage, where the voltage is regulated at a fixed voltage and the current gradually decreases until the charge current is too low to be meaningful. The entire charging process is monitored by the device and adjustments to the charge current, voltage and termination criteria can be made by the user to tailor the charging profile to the specific battery type.

The BQ24278YFFR has various safety functions to protect both the battery and the device from damage. It includes over-temperature protection, over-voltage protection, over-charge protection, short circuit protection and reverse current protection. These protection functions are designed to ensure that the battery will be charged safely. In addition, the device has an open-drain interrupt signal to alert the system of any faults or warnings. The status of the battery can also be monitored by the device, with the help of two ADCs which can be used to measure the battery voltage and temperature.

In conclusion, the BQ24278YFFR is a highly integrated, power-management and battery-charger integrated circuit that can be used in a wide range of portable electronic devices. It is designed to accommodate greater than 90% of the current market Li-ion or Li-Polymer cell count configurations and provides a robust charging solution with various safety features and easily adjustable charge parameters. With its ability to provide fast and efficient charging, the BQ24278YFFR can be the perfect choice for many portable applications requiring Lithium-ion or Lithium-polymer batteries.

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