KA7809ETSTU

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KA7809ETSTU application field and working principle

KA7809ETSTU is a linear voltage regulator, which belongs to the PMIC Voltage Regulators product family. It is intended for use in applications that require low-noise, high-stability and low-dropout linear regulation. It has a low operating voltage, low dropout voltage and wide operating current range, making it suitable as an alternative to switch mode voltage regulators in applications that require low noise, low-cost and high efficient power conversion. This paper will discuss the application field and working principle of KA7809ETSTU.

Application field

KA7809ETSTU is designed to meet the power requirements of a wide range of applications, including communications, consumer, medical, industrial and automotive. It is designed to provide stable and reliable voltage supply of linear voltage regulator to these kinds of electronic systems.

It has excellent line/load regulation specifications. With an input voltage of 3.3V to 30V, an adjustable output voltage of 1.25V to 33V, and a maximum operating current of 1A, the KA7809ETSTU offers the flexibility to meet the power requirements of modern and legacy circuitry.

The KA7809ETSTU also features low-noise, high-stability and low-dropout voltage output and low quiescent current, making it suitable for applications where low-noise and low-power operation is essential, such as communication and telecommunication systems.

The KA7809ETSTU is also suitable for use in portable applications, as it features high efficiency and low power consumption. Additionally, the KA7809ETSTU is current-limited and short-circuit protected, which ensures reliability in the case of an overload condition.

Working principle

The KA7809ETSTU is a three-terminal adjustable linear regulator that utilizes an advanced error-amplifier architecture to provide high bandwidth and low noise operation. The voltage regulator consists of an NPN pass element, an error amplifier, and over-voltage, under-voltage and over-current protection circuitry.

The output voltage is set using two external resistors, which are connected to the adjust pin. When the voltage at the adjust pin is higher than the reference voltage applied to the internal reference pin, the error amplifier switches the pass element on, allowing current to flow from the output to the reference pin. The pass element will remain on until the voltage at the adjust pin is brought back in line with the reference voltage.

When the load current changes, the KA7809ETSTU quickly responds by adjusting the output voltage to maintain a constant voltage. It also features current limit, short-circuit protection, and thermal shutdown. The over-current and over-voltage protection circuitry ensures the regulator will not be damaged in case of overloads or unexpected surge conditions.

Conclusion

KA7809ETSTU is a three-terminal adjustable linear regulator, which belongs to the PMIC Voltage Regulators product family. It is intended for use in applications that require low-noise, high-stability and low-dropout linear regulation. The output voltage is set using two external resistors, which are connected to the adjust pin. It features low-noise, high-stability and low-dropout voltage output, low quiescent current, current limit, short-circuit protection, and thermal shutdown.

The KA7809ETSTU is designed to meet the power requirements of a wide range of applications, including communications, consumer, medical, industrial and automotive. It has excellent line/load regulation specifications, making it suitable for applications where low-noise and low-power operation is essential, such as communication and telecommunication systems. It is also suitable for use in portable applications due to its high efficiency and low power consumption.

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