S-817B55AMC-CXST2U

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Introduction

The S-817B55AMC-CXST2U is a linear voltage regulator from the PMIC (Power Management IC) family. It is a single-channel three-terminal positive voltage regulator that produces output voltage with 0.1 V to 4.2 V accuracy at 2 A maximum. It features external current limit and power-good signal, and comes in an SOP-8SMD package. It is an ideal device for portable electronic equipment.

Application Field

The S-817B55AMC-CXST2U is primarily designed for portable electronic devices. It is ideal for use in mobile phones, digital cameras, PDAs, and other electronic devices that require a low-voltage power supply. It offers high accuracy and low noise, which is necessary for portable devices that must operate efficiently in all locations and conditions. It also provides enhanced protection against short-circuits, thermal overload, and over-voltage, which makes it suitable for use in automotive and industrial applications.

In addition, the S-817B55AMC-CXST2U can be used in applications such as battery management, power conversion, and power distribution. These applications require optimal power performance and reliable regulation, making the S-817B55AMC-CXST2U a perfect choice for these sorts of applications.

Working Principle

The S-817B55AMC-CXST2U is a linear voltage regulator, which means that it works by decreasing the output voltage by a small amount in order to reduce the voltage level. It is controlled by two inputs, an enable pin and a voltage sense pin, that enable the voltage regulator to regulate the output voltage. The enable pin ensures that the device is only active when enabled, while the sense pin monitors the output voltage in order to maintain regulation.

The S-817B55AMC-CXST2U performs its voltage regulation by the following steps:

1. The enable inputs is asserted to activate the voltage regulator.
2. The sense pins monitors the output voltage, and compares it to the preset voltage.
3. When the output voltage is less than the preset voltage, the voltage regulator reduces the voltage drop by a small amount in order to raise the voltage level.
4. When the output voltage is greater than the preset voltage, the voltage regulator increases the voltage drop by a small amount in order to lower the voltage level.
5. The voltage regulator continues to adjust the voltage drop until the output voltage is equal to the preset voltage.

The adjustment of the voltage drop is done through a circuit known as the error amplifier, which is used to sense the output voltage and compare it to the preset voltage. When the output voltage is not equal to the preset voltage, the error amplifier sends a signal to the voltage regulator, which then adjusts the voltage drop in order to reach the preset voltage. Once the preset voltage is reached, the error amplifier sends a signal to the voltage regulator to cease the adjustment of the voltage drop.

Conclusion

The S-817B55AMC-CXST2U is a linear voltage regulator from the PMIC family. It features an external current limit and power-good signal and can produce output voltage up to 4.2V with 0.1V accuracy. The device is primarily designed for portable electronic devices, but it can also be used in other applications such as battery management, power conversion, and power distribution. Its working principle relies on an error amplifier which senses the output voltage and compares it to the preset voltage, and then adjusts the voltage drop in order to reach the preset voltage.

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