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PMIC - Voltage Regulators - Linear

The AP1117K18L-U is an adjustable low-dropout, low-noise, linear regulator designed for applications requiring a wide input voltage range, fast transient response, and excellent power-supply-ripple rejection. The AP1117K18L-U is available in single outputs of 1.8V to 3.3V and can deliver +1A output current. Its extremely fast transient response ensures it remains stable even during high frequency/high amplitude noise rejection and rapid load changes. Its low dropout voltage also makes it suitable for situations where input and output voltages are similar.

Applications

The AP1117K18L-U is best suited for advanced applications that require very clean power supplies and excellent transient protection, including But it is also suitable for industrial and automotive applications such as motor control, battery management systems, micro-controller systems, displays, measurement and control systems, point-of-load circuits, telecoms and embedded systems, as well as a wide range of other applications.

Working Principle

The AP1117K18L-U functions as a low-dropout, low-noise linear regulator with a wide input voltage range. It works through a process of regulating the input voltage by manipulating its internal components to keep a fixed voltage output. It can do this using either a low-dropout resistor or an external transistor for current limiting.

The AP1117K18L-U has a power-supply-ripple rejection pin that helps reduce noise from incoming power supply. This helps the regulator reduce the amount of noise it has to artificially regulate, thus making it more reliable. An internal reference and bandgap circuitry are used to maintain a stable voltage output with minimal voltage variations. The fast transient response of the AP1117K18L-U ensures it remains stable despite sudden load or supply changes, meaning it is able to continuously regulate the output voltage.

Advantages

The advantages of using the AP1117K18L-U as a low-dropout, low-noise linear regulator include its wide input voltage range, fast transient response, excellent power-supply-ripple rejection, and low dropout voltage. With its wide input voltage range, the AP1117K18L-U can be used in applications with a wide range of input voltage levels. Its fast transient response ensures it remains stable even in the presence of rapid load or supply changes. And its low dropout voltage makes it ideal for situations in which the input and output voltages are close to the same.

Conclusion

The AP1117K18L-U is an adjustable low-dropout, low-noise, linear regulator designed for situations requiring a wide input voltage range, fast transient response, and excellent power-supply-ripple rejection. It is best suited for applications that require very clean power supplies and excellent transient protection. It is also suitable for industrial and automotive applications such as motor control, battery management systems, micro-controller systems, displays, measurement and control systems, point-of-load circuits, telecoms, and embedded systems.

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