MIC4576BU

Voltage - Output (Min/Fixed):	1.23V
Base Part Number:	MIC4576
Supplier Device Package:	TO-263-5
Package / Case:	TO-263-6, D²Pak (5 Leads + Tab), TO-263BA
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	200kHz
Current - Output:	3A
Voltage - Output (Max):	33V
Series:	--
Voltage - Input (Max):	36V
Voltage - Input (Min):	4V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Obsolete
Packaging:	Bulk

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Introduction to MIC4576BU: MIC4576BU is a high-performance, low power consumption, CMOS-based voltage regulator family. It consists of an on-chip voltage regulator and an external power transistor. The MIC4576BU family of ICs is designed for high-efficiency DC-DC switching and is capable of providing a regulated output voltage for a wide range of input voltage ranges and operating frequencies. Applications of MIC4576BU:MIC4576BU is suitable for various voltage conversion applications, such as computer motherboards, portable devices, power supplies and many other consumer electronics where a reliable, high-efficiency voltage regulator is required. The IC can be used to design DC-DC switching regulators, point-of-load converters (POL), buck-boost regulators and other types of power converters. The MIC4576BU family uses a Current-Mode PWM (Pulse Width Modulation) control scheme to provide excellent regulation performance over a wide range of line and load conditions. This enables the ICs to provide a higher efficiency than other voltage regulators with synthetic PWM control schemes.Working Principle of MIC4576BU:The MIC4576BU operates on the principle of switched mode power conversion. The voltage regulator consists of an internal oscillator, an error amplifier, a PWM comparator, and an internal current sense circuitry. The internal oscillator generates a switching frequency which is adjustable with an external resistor.The error amplifier compares the external voltage reference voltage with the output voltage. Once the output voltage reaches the reference voltage, the error amplifier enters the inactive state, turning off the power FET. This stops the converter from switching. The PWM comparator compares the peak inductor current with the reference voltage and acts as a hysteresis control to prevent the output voltage from diverging. The current sense circuitry senses the peak inductor current in order to provide accurate feedback to the PWM comparator. As the current rises, the reference voltage is decreased to increase the duty cycle of the power FET and to cause more current to be stored in the inductor. This maintains the output voltage at the desired level.Conclusion:The MIC4576BU is a versatile and efficient CMOS-based voltage regulator family. It is well-suited for a variety of voltage conversion applications, such as motherboard power supplies, portable devices, and other consumer electronics. It is based on the principle of switched mode power conversion and utilizes a Current-Mode PWM control scheme to provide excellent regulation performance over a wide range of line and load conditions. As a result, it provides a higher efficiency than other voltage regulators with synthetic PWM control schemes.

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