MP20042DG-DD-LF-Z

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MP20042DG-DD-LF-Z Application Field and Working Principle

MP20042DG-DD-LF-Z is a standard three-terminal low-dropout (LDO) linear voltage regulator. It belongs to integrated circuit (IC) family of voltage regulators, more specifically part of the PMIC (Power Management IC) – Voltage Regulators – Linear category. This type of regulator works on the principle of providing a fixed voltage output without any additional external components. As opposed to other types of voltage regulation mechanisms, such as switching regulators, which require many additional components, the linear regulator is simple and cost effective.

The MP20042DG-DD-LF-Z is a monolithic integrated circuit designed to offer excellent overcloking capability up to 140%. This device also features a low ground current (IGND) of typically 20 µA and a maximum dropout voltage of just 0.5 V. Its high output current capability of 2 A makes it a great choice for applications requiring up to 2 A power supply.

The device features a wide input voltage range of 1.60V to 18V and an output voltage range of 1.225V to 17V. The load regulation and line regulation are both high, providing very low-noise output even in demanding applications. The temperature coefficient and ripple rejection also exceed industry standards. The output voltage can be easily adjusted using a simple onboard potentiometer for great flexibility.

Applications

The MP20042DG-DD-LF-Z is a versatile device suitable for a wide range of applications, including post-regulator, input voltage supervisor, 5V and 12V on-board voltage regulation, and high-efficiency voltage regulator. With its low drop-out voltage and high output current, this device is especially suitable for automotive applications. It is also popular as a power supply for microcontrollers, memory devices, digital circuits, and other low-voltage components.

The device is suitable for fixed output voltage, such as 2V, 3V, 5V, and other voltage levels. It is designed to regulate output current up to 2A and have a safe operating area (SOA). This makes it suitable for a wide range of applications, such as battery-powered systems, microprocessor and memory reset circuits, and low-voltage linear regulators.

Working Principle

The MP20042DG-DD-LF-Z is a linear three-terminal low-dropout (LDO) regulator. It consists of two transistors, two resistors, a zener diode, and a temperature sensor. The output voltage is determined by the resistance ratio of the two resistors and the zener diode. The two transistors form a pass-type regulator which engages or disengages the current path between the input and output terminals depending on the output voltage. The temperature sensor senses the ambient temperature and adjusts the output voltage accordingly.

The input voltage is applied to the input terminals, where it is rectified and filtered to a suitable voltage level. This voltage is then applied to the base of the pass-type transistor, which is configured as an emitter-follower. The pass-type transistor controls the current flow through the two resistors according to the output voltage from the zener diode. As a result, the output voltage is equal to the zener voltage. The voltage is also temperature compensated by the temperature sensor for temperature variations. When the output voltage rises higher than the zener voltage, the pass-type transistor goes into the cut-off state and the output voltage is regulated.

Conclusion

The MP20042DG-DD-LF-Z is a standard three-terminal low-dropout (LDO) linear voltage regulator designed to offer excellent overcloking capability up to 140%, low ground current, and high output current of 2A. It is suitable for a wide range of applications, such as post-regulator, input voltage supervisor, 5V and 12V on-board voltage regulation, and low-pressure linear regulators. The device works on the principle of controlling the current flow through two resistors and a zener diode based on the output voltage. The temperature sensor ensures stabilization by sensing the ambient temperature and adjusting the output voltage accordingly.

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