SI9185DMP-33-T1-E3

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• Introduction

  The SI9185DMP-33-T1-E3 is a highly integrated, dual-output, voltage regulator with a very low quiescent current, high load current capability, and fast transient response. It provides a low dropout voltage at a low operating voltage, and is suitable for regulating various operating voltages.

• Application Field and Working Principle

  The SI9185DMP-33-T1-E3 is designed to provide an accurate regulated voltage in a wide range of applications. It provides high efficiency and fast transient response, and can be used in systems such as portable devices, automotive electronics, and consumer products. Its core working principle is based on a linear voltage regulator, which is usually composed of an error amplifier, a reference voltage source, a pass transistor, and a few other components.

  • Error Amplifier

    The error amplifier is the key component of a linear voltage regulator that is responsible for comparing the feedback voltage with the reference voltage to control the pass transistor. It is a high gain operational amplifier with a built-in inverting and non-inverting stage. When the feedback voltage is higher than the reference voltage, the output of the error amplifier will reduce the voltage of the pass transistor and thereby reduce the load voltage.

  • Reference Voltage Source

    The reference voltage source is the internal voltage source used to compare the feedback voltage with a fixed value. It is usually a band gap reference circuit, which is composed of two diodes and a transistor. The reference voltage is either set externally or is a fixed value depending on the model.

  • Pass Transistor

    The pass transistor is the main element that controls the output voltage. The pass transistor is usually a PMOS or NMOS transistor with a built-in diode to protect the regulator from over current or reverse current. It is controlled by the output of the error amplifier, and its voltage is regulated in order to achieve the desired output voltage.

  The working principle of the linear voltage regulator is based on the principle of “error correction”, which means that the error amplifier constantly monitors the output voltage and keeps it within a predetermined range using the reference voltage as a reference. Any changes in the output voltage will be detected by the error amplifier and the output voltage can be adjusted accordingly. This advantage makes it an ideal choice for many applications such as consumer electronics, automotive electronics, and portable devices.

• Conclusion

  The SI9185DMP-33-T1-E3 is a highly integrated dual output voltage regulator that provides efficient, accurate and fast transient response. It is based on a linear voltage regulation principle that utilizes an error amplifier, a reference voltage source and a pass transistor to regulate the output voltage. It is suitable for a wide range of applications such as consumer electronics, automotive electronics, and portable devices.

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