UC3903QG3

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PMIC (Power Management Integrated Circuit) is a type of hardware that automates the distribution of power supply for the system. PMICs are widely used in modern electronic systems, in many cases replacing the traditional transformer, rectifiers, and linear regulators. PMICs help reduce power consumption, increase efficiency, and reduce the size and complexity of the system. Supervisors, also known as power supervision ICs, are a type of PMICs designed to protect systems from conditions such as under-voltage, over-voltage, and environmental noise. Supervisors can detect these conditions and then signal an event (usually through a reset output, interupt, or signal pin). Supervisors are typically used for microprocessors, FPGAs, and other digital ICs.The UC3903QG3 is a supervisor IC from Texas Instruments. It is designed to provide precision voltage monitoring and voltage reset control, and is capable of monitoring both rising and falling supplies. The UC3903QG3 is a highly integrated solution, incorporating all the necessary components into a 3-pin SOT-23 package.The primary application field of the UC3903QG3 is for power systems and systems that require voltage monitoring or reset control. These include microcontrollers, DSPs, FPGAs, ASICs, and other digital devices. The IC is compatible with a variety of power supplies, including both AC/DC and Li-ion/ Li-polymer.The working principle of the UC3903QG3 revolves around its two main pins, VDD and THI. VDD is the power pin and provides the power supply to the IC. THI is the threshold input pin, and is used to set the trip point voltage of the IC. When the voltage on the THI pin rises above the trip point voltage, the reset output of the IC goes low, signaling an event and resetting the system.The IC also provides a variety of built-in protection features, such as current limiting, short circuiting protection,and over-temperature protection. Additionally, it includes a reset enable/disable pin that allows for manually disabling the reset output.Overall, the UC3903QG3 is a highly versatile and reliable supervisor IC for power systems and systems that require voltage monitoring and reset control. Thanks to its small package and robust protection features, it is ideal for applications where small size and high reliability are of the utmost importance.

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