RT9018A-1KGSP

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RT9018A-1KGSP Application Field and Working Principle

The RT9018A-1KGSP belongs to the family of low power linear voltage regulator ICs designed for use in space-constrained applications. It provides a constant and adjustable output voltage from 0.6V to 4.1V and is available in a wide range of packages from SOT23-5 to SOP-8. Its maximum output current is 500mA, making it suitable for use in portable and consumer applications.

The RT9018A-1KGSP works on the principle of linear voltage regulation. It is designed to regulate the output voltage of a power supply system, regardless of fluctuations in the input voltage. The output voltage can be adjusted using an external resistor, allowing the user to fine-tune the voltage meeting their requirements.

Proposed Application Field

The RT9018A-1KGSP is ideal for consumer electronics applications such as digital cameras and portable audio players, where space is limited. It is also suitable for portable devices such as cellphones, digital media players, and laptops, while still providing plenty of low noise and stable output voltage. Furthermore, it is well-suited for handheld instruments such as barcode scanners, handheld medical equipment, and other portable measurement systems.

RT9018A-1KGSP Benefits

The RT9018A-1KGSP is a low power linear voltage regulator that offers a wide operating input voltage range (from 4.5V to 40V), low dropout voltage (as low as 0.4V), and low quiescent current. Moreover, it offers output voltage programmability and reverse current protection to extend battery life. Finally, it is available in different packages such as SOT23-5, SOP-8, and MSOP-8.

Typical Application Circuit

The RT9018A-1KGSP can be used in a wide variety of applications. A typical application circuit for this part is shown in Figure 1. In this circuit, the RT9018A-1KGSP is connected between an input voltage source and an output load. The input voltage of up to 40V is applied to the input terminals and regulated by the RT9018A-1KGSP. The output voltage can be adjusted using the external resistor, R1. This configuration allows the user to adjust the voltage to their desired levels within the specified operating range.

Working Principle of the RT9018A-1KGSP

The RT9018A-1KGSP uses a linear voltage regulator to maintain a constant output voltage. The linear regulator has two operating modes: dropout and normal. In normal operating mode, the output voltage is determined by the internal reference voltage and the feedback resistor. During dropout, the output voltage drops below the reference voltage due to the increased input voltage. The linear regulator maintains a constant output voltage regardless of fluctuations in the input voltage up to a maximum of 40V.

When the voltage at the OUT terminal is greater than the voltage at the FB terminal (on pin 1), the output voltage is increased. This is because the voltage across the series internal pass element increases and the resultant increased current causes the output voltage to rise. Conversely, when the voltage at the OUT terminal is less than the voltage at the FB terminal, the output voltage is decreased. This is because the voltage across the series internal pass element decreases and the resultant decreased current causes the output voltage to drop.

The output voltage can be further regulated by an external resistor, R1. This resistor is connected between the FB terminal and OUT terminal as shown in Figure 1. By fine-tuning the value of the external resistor, the user can adjust the output voltage of the IC up to the specified operating range.

Conclusion

In conclusion, the RT9018A-1KGSP is a low power linear voltage regulator IC and suitable for many different types of applications. It provides excellent performance and stability and its adjustable output voltage allows for fine-tuning for the best performance. Finally, its wide operating input voltage range makes it ideal for portable and consumer applications.

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