MIC4575BU

Voltage - Output (Min/Fixed):	1.23V
Base Part Number:	MIC4575
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:	1.7A (Switch)
Voltage - Output (Max):	20V
Series:	--
Voltage - Input (Max):	24V
Voltage - Input (Min):	4V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck, Buck-Boost
Output Configuration:	Positive
Function:	Step-Down, Step-Up/Step-Down
Part Status:	Obsolete
Packaging:	Bulk

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MIC4575BU Application Field and Working Principle

The MIC4575BU is a DC-DC switching regulator from the MIC45XX-series manufactured by Micrel, Inc. It is a monolithic IC designed to provide a regulated output voltage from a wide input voltage range. To achieve that, the IC utilizes a switching regulator topology, also known as a buck or step-down converter.

Applications

The MIC4575BU is suitable to be used in a wide variety of applications, such as portable instruments, battery-operated equipment, embedded systems, computing and telecommunications, LED driver, and many others. Thanks to its versatility and challenging operating conditions, the circuit is commonly found in electronic products such as mobile electrical/electronic devices and Notebook PCs.

Features

Amongst other features, the MIC4575BU offers an adjustable output voltage between 0.8V and 5V, a highly accurate Output Voltage regulation precision, an Output Current Limit from 2A to 8A, and a switching frequency up to 2.5MHz (Typ). It also possesses Under Voltage Lockout (UVLO) and Thermal Shutdown Protection for safety.

Pinouts

The MIC4575BU integrates a total of 8 Pinouts for its standard offering, comprising Power–Ground, Voltage supply and control, plus Output Voltage pins. The following picture illustrates MIC4575BU pin assignment:

Circuit Operation

The working principle behind the MIC4575BU is based on the Buck converter (a.k.a Step Down converter) topology, a widely adopted switching regulator circuit which operates by converting a higher input voltage into a lower voltage output. The circuit works by having a switch close and open following the input voltage or a fixed frequency, thus allowing for voltage reduction.The Output Voltage of the MIC4575BU is controlled by the FB pin, where the voltage level is regulated with respect to the reference output. Meanwhile, the Current Limit isadjustable throughout the CS pin, which acts as the regulation node to set the Output Current. The circuit also benefits from having an input Under Voltage Lockout (UVLO) circuit, which regulates the voltage support levels required to run the IC.

Internal Block Diagram

The next picture depicts the internal block diagram of the MIC4575BU, featuring the components and interconnected sections of the device.The IC is composed of a main planar power transistor (MOSFET), connected to the input voltage, which acts as the main switch element to regulate the output voltage. The MOSFET is control by the PWM comparator, which compares its input logic signals to a reference level and adjust the pulse width at output. The linear regulator section offers precision current to the error amplifier, as well as a great deal of protection mode such as over temperature, over current, and short-circuit.

Conclusion

The MIC4575BU by Micrel, Inc is a robust DC-DC switching regulator designed for a wide variety of portable and embedded applications, possessing high precision and great stability characteristics. Featuring features such as an adjustable Output Voltage range, a high Output Current Rate, an Over Voltage Lockout (UVLO) and Thermal Shutdown Protection, the DE-DC switching regulator is commonly seen in electronic products, such as mobile electrical/electronic devices and Notebook PCs.

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