MIC4575WU

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:	Active
Packaging:	Tube

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MIC4575WU Application Field and Working Principle

The MIC4575WU is a fixed-frequency step-up DC-to-DC converter in the MIC47xx/MIC45xx family of monolithic power solutions from Micrel. It contains all necessary protections and circuitries to address various RF and EMI requirements, making it an ideal device for automotive, industrial, and consumer power applications. This device can be used to generate an output voltage as high as 15.5V, and it is available in an SO-8 package option.

Application Field

The MIC4575WU provides a high integration of linear and digital control functions and is ideal for use as DC-to-DC converter in a wide range of industrial, consumer, automotive, and portable electronics applications.It is ideal for window/sunroof motors, cooling fans, lighting applications, small engine management systems, and in audio amplifiers. It can also be used in solar power generation systems, mobile phone chargers, notebook computer adapters, battery powered equipment, and various DC motor drive applications.

Working Principle

The MIC4575WU is a monolithic voltage-mode PWM DC-to-DC step-up converter with integrated high- and low-side MOSFETs. It operates in a pulse-frequency modulation (PFM) mode at light loads and in a pulse-width modulation (PWM) mode at heavier loads.The MIC4575WU works by operating a fixed-frequency oscillator with a hysteretic comparator voltage threshold. When the voltage threshold is exceeded, the oscillator is disabled and a preset timer is enabled, keeping the output voltage within its predetermined range. The PWM control logic adjusts the on-time controlled by the oscillator frequency, thus creating a step-up DC-to-DC converter. The MIC4575WU also incorporates a number of integrated protection circuits, including over-current protection, over-temperature protection, and output over-voltage protection, that protect both the IC itself and the load from damage due to incorrect conditions.

Conclusion

The MIC4575WU is a fixed-frequency step-up DC-to-DC converter that is ideal for use in a wide range of industrial, consumer, automotive, and portable electronics applications. It operates in a pulse-frequency modulation (PFM) mode at light loads and in a pulse-width modulation (PWM) mode at heavier loads. Additionally, it incorporates a number of integrated protection circuits to protect both the IC itself and the load from damage.

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