BQ24115RHLRG4

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Battery chargers are essential components in many electronic systems, providing a means of replenishing power from an external source. The BQ24115RHLRG4 is a compact and highly integrated battery charger integrated circuit (IC) that offers a complete charging solution for rechargeable Lithium-Polymer (LiPo) batteries. By combining features and performance that has been previously found only in USB-dedicated charger ICs, the BQ24115RHLRG4 is capable of providing a low cost and highly efficient way to charge your LiPo batteries.

The BQ24115RHLRG4 is a highly integrated battery charger featuring constant-current/constant-voltage control, high efficiency operation, and low ripple operation. The device is designed for use in tablet PCs, PDAs, digital cameras and other mobile applications, as it is capable of charging up to 8-cell Li-Ion/Li-Polymer batteries. It is provided in a space-saving, eight-pin RoHS-compliant DFN package or a SOT-23.

The device can operate in either linear, pulse width modulation (PWM) or fast control charging modes based on user requirements. Linear control charging offers low noise, low cost and low ripple operation, whereas PWM and fast control charging modes offers more flexibility and high efficiency. The device also features over-voltage, under-voltage, over-current and over-temperature protections.

The working principle of the BQ24115RHLRG4 is simple - the integrated circuit functions as an asynchronous buck converter that converts an input voltage source, typically 5V or 8V, into an output voltage used to charge a Li-Polymer cell. It finely regulates the output voltage and current, allowing for safe and efficient charging of Li-Polymer cells. This process consists of three stages - precharging, trickle charging and full-speed charging.

The device first applies a constant current precharge for cell balancing and then switches to continual trickle charging for about 2/3 of the total charging time. Finally, it is automatically switched to full-speed charging, where the output current is determined from the battery’s internal resistance. During all these steps, the output voltage is kept at the set value, ensuring that the battery is not overcharged or damaged.

The BQ24115RHLRG4 is an ideal charger for Li-Polymer batteries, as it offers higher efficiency and allows for optimized charging. Its application fields include mobile devices such as tablets, PDAs, digital cameras and other mobile applications, where a compact power management solution is needed. By providing a full-featured and robust charging solution, the BQ24115RHLRG4 is the perfect choice for applications requiring a high efficiency and low-cost charging solution.

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