MIC5255-2.85YD5-TR

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The MIC5255-2.85YD5-TR is a linear voltage regulator — a member of the Power Management IC (PMIC) family. This particular device is a small, low dropout (LDO) regulator which uses an external N-channel MOSFET to regulate an input voltage to a fixed output voltage across a wide range of operating conditions. The output voltage can be set to a specific level, enabling the design engineer to provide a constant power source to a variety of circuits.

Application Field

The MIC5255-2.85YD5-TR is ideal for applications that require a regulated supply voltage with a high current capability and low dropout voltage. It is suitable for use in very fast transient response circuits where the output voltage needs to remain accurate in spite of large currents quickly drawn from the output. It is also often used in combination with microcontroller-based designs to ensure that the microcontroller receives an appropriate supply voltage.

The device is also of particular interest in multi-stage regulator circuits. It can be used as the first stage of a regulator to provide a wide output range capability, in conjunction with an additional adjustable regulator that provides fine output adjustment. This arrangement provides a greater degree of regulation accuracy than if a single regulator were used for both coarse and fine adjustment.

Working Principle

The MIC5255-2.85YD5-TR uses an external N-channel MOSFET to control the output voltage. This transistor is driven by a low voltage control signal, usually derived from a 5V or 3.3V logic voltage, and connected at the gate input of the external MOSFET. The output voltage is determined by the feedback voltage applied to an internal error amplifier.

The output voltage is constantly monitored and is adjusted by the error amplifier as necessary to maintain a predetermined output voltage. The MOSFET is then driven through its gate input to keep the output voltage level. The MOSFET is also used to provide current limiting in the event of an overload or overtemperature.

The MOSFET control circuit also includes a power-on reset circuit, which allows the device to detect and restart the start-up sequence in the event of an overload or failure. The power-on reset circuit also prevents the device from being enabled improperly when the output is shorted to ground.

The MIC5255-2.85YD5-TR is designed to operate from an input voltage range of 2.7V to 5.5V. It has a maximum output current of 1.4A, making it suitable for most low power systems. The typical dropout voltage is 195mV, making it suitable for applications where low voltage is required.

Conclusion

The MIC5255-2.85YD5-TR is a versatile and efficient linear voltage regulator. It is suitable for a wide range of applications, including fast transient response circuits, microcontroller-based designs and multi-stage regulator circuits. Its wide input voltage range and low dropout voltage make it an ideal choice for applications that require an accurate, low voltage power supply.

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