MIC4575-5.0WU

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MIC4575-5.0WU Application Field and Working Principle

The MIC4575-5.0WU belongs to the family of DC-DC Switching Regulators, a type of voltage regulator. DC-DC switching regulators are used when it is necessary to obtain a regulated output voltage from an unregulated input voltage. It is a 4-pin, fixed frequency, high current, step-down DC-DC switching regulator. It uses an exclusive Burst Mode operation, achieving very low quiescent current.

The MIC4575-5.0WU is designed to deliver a regulated output voltage of 5.0V at a maximum output current of 1.5A with a fixed switching frequency of 500KHz. As such, the MIC4575-5.0WU is best suited for applications that require a low output noise and low supply current, such as camera modules, motor control and cellular phone power accessories.

Working Principle

The MIC4575-5.0WU circuit, shown in Figure 1, is made up of three main stages - an oscillator, a regulation circuit, and a MOSFET switch. In this circuit, the oscillator generates a fixed frequency, which is then fed to the regulation circuit.

The regulation circuit, also known as the error amplifier, compares the output voltage with the reference voltage and drives the MOSFET switch accordingly. The MOSFET switch is the main element of the switching regulator. It works by switching the power supply voltage on and off at the set frequency.

When the switch is turned on, current flows through the inductor, increasing its magnetic flux. When the switch is turned off, the stored energy in the inductor is delivered to the load. This cyclic flow of power is what produces the output voltage from the input voltage.

The MIC4575-5.0WU also features a clipped regulation mode for greater efficiency. In this mode, the output voltage is regulated by limiting the pulse width of the switch. This feature helps to reduce power dissipation and improve efficiency.

Conclusion

The MIC4575-5.0WU belongs to the family of DC-DC switching regulators. It is designed to deliver a regulated output voltage of 5.0V at a maximum output current of 1.5A with a fixed switching frequency of 500KHz. It uses an exclusive Burst Mode operation, achieving very low quiescent current. The MIC4575-5.0WU\'s clipped regulation mode helps to reduce power dissipation and improve efficiency.

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