NCP1117ST33T3G

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The NCP1117ST33T3G is a low dropout voltage regulator from ON Semiconductor. It is a linear regulator, specifically, a low quiescent current, micropower low dropout regulator. It is designed to operate from 2.5V to 7V and deliver up to 1A of continuous output current. This makes it suitable for systems that require low voltage operation or a wide range of input voltages.

The NCP1117ST33T3G features a maximum dropout voltage of only 0.82V at 1A load, and only draws 0.115A quiescent current. This means it can provide a stable output voltage even when supplying current to low dropout loads such as FPGAs, DSPs, microcontrollers, and other logic. It also features low noise, output accuracy of ±2%, temperature stability of 0.015% per °C, and load regulation of 0.2%.

Application fields of the NCP1117ST33T3G are numerous. It is suitable for applications that require low voltage, low current, and stability over a wide range of input and output voltage. This includes powering logic circuits, memory circuits, audio and radio systems, portable devices, wireless networks, and embedded systems. Additionally, since the NCP1117ST33T3G is a low dropout regulator, it can provide a voltage down to the minimum required for a particular application, since it is able to maintain its stated accuracy even when the input voltage is close to the output voltage. This means that it performs well even in applications where the loading is light.

The working principle of the NCP1117ST33T3G is relatively simple. It uses an internal PNP transistor and a series pass element to regulate the output voltage. The internal PNP transistor is typically controlled by two resistors, a bandgap reference voltage, and an internal error amplifier. The resistor divider circuit is used to set the output voltage, while the error amplifier compares the voltage at its inputs and adjusts the current in the internal PNP transistor to maintain the voltage at the external sense terminal at the reference voltage.

The NCP1117ST33T3G\'s main advantages are low quiescent current, low dropout, and high efficiency. It is well suited for many applications in which low voltage and low current draw are essential. Additionally, its high accuracy, temperature stability, and load regulation make it an ideal voltage regulator for a variety of applications.

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