BQ51025YFPR

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Power management integrated circuits, or PMICs, are an indispensable component in modern digital devices, including smartphones, PCs, and tablets. They provide reliable voltage regulation and power distribution across a wide range of integrated circuits. PMICs can come in many forms, such as general purpose ones with fixed output voltages, or specialised ones with customisable power management functions. One example of a specialised PMIC is the BQ51025YFPR, which is often used for charging and powering capacitive touchscreens. In this article, we will discuss the application field and working principle of the BQ51025YFPR.

The BQ51025YFPR is a single-chip solution, designed for powering and charging capacitive touchscreens for mobile devices. It features an integrated, low-power switch-mode power supply, built-in thermal protection, and programmable input current limit. This enables it to ensure power stability and prevent overheating of the touchscreen. It also offers flexible control options, allowing the user to control the output voltage and current. This PMIC can be used in a wide range of applications, including smartphones, tablets, point-of-sale (POS) systems, and more.

The BQ51025YFPR is a capacitor-multiplier charging solution. It has a constant-frequency, peak-current-mode control design that helps it to achieve high efficiency over a wide input and output range. It provides Precision-mode charging (PMC) at up to 2A with a +/- 6.5% accuracy. This ensures a steady charging rate that helps to extend the life of batteries. This PMIC can also charge multiple batteries simultaneously, as it has multiple charging channels and programmable output voltage options.

Intermittent input and output current signals are converted to a 25kHz PWM signal, which is then used to control the output current. The BQ51025YFPR has two voltage-setting pins, allowing the user to set the output voltage with an external voltage reference. The PMIC then modulates the switching duty cycle of the integrated power switch to stay within the pre-programmed current limit. It also monitors the voltage and current conditions of the power source and load, and signals a fault if either of them exceeds their threshold level.

The BQ51025YFPR is designed to provide reliable power to capacitive touchscreens and other low-power devices. Due to its advanced features, such as precision-mode charging, wide input and output range, and integrated power switch, it has become a popular choice for mobile device manufacturers. It offers improved device performance, reliability, and power efficiency, making it an ideal solution for powering and charging capacitive touchscreens.

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