MMPF0100F1EP

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PMIC (Power Management IC) is the most commonly used semiconductor device in modern electronics, and voltage regulators are one of the most common type of power management ICs. Special purpose voltage regulators are a sub-category of general purpose voltage regulators, intended for specific applications. The MMPF0100F1EP is a low dropout (LDO) voltage regulator which belongs to the special purpose category. This application note will give an overview of its application field and its working principle.

Application Field

The MMPF0100F1EP is a low dropout voltage regulator designed for use in circuits which have an input voltage of 2.7V to 5.5V and an output voltage 1.2V to 3.3V. It features an adjustable output current limit from 0mA to 200mA, making it suitable for powering small motors, LED drivers, and other low-power digital circuits. It also includes several safety features such as reverse current, overcurrent, and overtemperature protection, making it a robust and reliable device when used in automotive, industrial, and medical applications.

The MMPF0100F1EP is highly flexible and suitable for use in a wide range of applications and environments, as it can tolerate input voltages up to 36V, supports both step-down and step-up topologies, and offers very low noise and ripple characteristics. It has an operating temperature of -40°C to +85°C, and is available in space-saving industry standard SOT-223 packages.

Working Principle

The MMPF0100F1EP works by regulating the output voltage by controlling the current through pass transistor Q2, which is connected in series with a sense resistor Rs. When connected to a supply voltage, current will flow through R1, R2, and Q1, setting the voltage at the gate of Q2. This voltage is sensed by Rs and will be compared to the reference voltage (Vref). If the output voltage falls below the desired value, the voltage at the gate of Q2 will increase, increasing the current flow through Q2 and thus raising the output voltage. Conversely, if the output voltage is too high, the voltage at the gate of Q2 will decrease, decreasing the current flow through Q2 and thus lowering the output voltage.

The output voltage can also be adjusted using an external resistor divider connected between the output and the ADJ terminal. This divider creates a reference voltage which is compared to the internal reference voltage. When the two reference voltages are equal, the output voltage will be steady at the desired level. The MMPF0100F1EP also offers a current limit function which can be adjusted via a separate external resistor connected between the SNS terminal and ground.

Conclusion

The MMPF0100F1EP is a low dropout voltage regulator that is suitable for use in a wide range of applications and environments. Its flexibility, safety features, and current limit make it very reliable and robust, making it ideal for powering motors, LED drivers, and other low-power digital circuits. Its working principle is based on controlling the current through an external pass transistor, and an external resistor divider can be used to adjust the output voltage to the desired level.

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