APX809S-26SR-7 Integrated Circuits (ICs)

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PMIC (Power Management Integrated Circuit), also known as PA (Power Adaptor), is a highly integrated power management device. It integrates several circuits, typically a linear regulator, a DC-DC converter, a sample and hold circuit, and a current limiter, which are used to manage the power of the integrated circuit. Among these circuits, the current limiter is a very important element, since its characteristics determine the total power of the integrated circuit. The APX809S-26SR-7 is a series of current limiters designed for use in a variety of applications, and is available in packages as small as a 2mm x 2mm chip. This article will discuss the application field and working principle of the APX809S-26SR-7.

The APX809S-26SR-7 is a member of the Supervisors family of products, which are a type of current limiters with integrated voltage supervisors. The supervisors provide an output preventing the power supply voltage from exceeding a pre-defined threshold. They are typically used in monitoring circuits, such as in communications and control systems. The APX809S-26SR-7 is designed as an advanced, low-power current limiter, with a detection voltage range of 1.25V up to 5.5V. It is capable of providing reliable overcurrent protection in such applications as cell phones, tablets and other embedded applications.

The APX809S-26SR-7 features a few main features that make it stand out from other current limiters. Firstly, it has a low standby current of 1µA, which helps to increase power efficiency in applications that would otherwise require high power consumption. Secondly, it offers extended temperature range operation from -40℃ to +85℃ and an adjustable current limit range from 1.25V to 5.5V. Finally, it has a wide voltage range, from 1.25V to 20V. These features make the APX809S-26SR-7 suitable for use in a wide range of applications.

The APX809S-26SR-7 works by sensing the voltage at its input pin and, if it exceeds a certain pre-defined threshold, it will initiate a current limit process. This process involves a feedback loop that compares the voltage at the input pin to the voltage at the output pin, and reduces the output current accordingly until the voltage at the input pin falls below the pre-defined threshold. Additionally, the APX809S-26SR-7 has internal thermal shutdown circuitry to protect itself from overheating in the event of prolonged overload conditions.

In summary, the APX809S-26SR-7 is a versatile current limiter designed for use in a variety of applications. It features a low standby current, wide voltage range, and an adjustable current limit range, making it suitable for embedded applications, such as cell phones and tablets. The device works by monitoring the input voltage and, if it rises above a pre-defined threshold, it will initiate a current limit process. Furthermore, it has internal thermal shutdown circuitry to protect itself during prolonged overload conditions.

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