MIC4574YN

Voltage - Output (Min/Fixed):	1.23V
Base Part Number:	MIC4574
Supplier Device Package:	8-PDIP
Package / Case:	8-DIP (0.300", 7.62mm)
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	200kHz
Current - Output:	500mA
Voltage - Output (Max):	20V
Series:	--
Voltage - Input (Max):	24V
Voltage - Input (Min):	4V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tube

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Introduction

MIC4574YN is a low-cost, highly efficient, easy-to-use DC-DC switching voltage regulator manufactured by Microchip Technology. As a DC-DC switching voltage regulator, it is designed to deliver a regulated output voltage with a maximum output current of up to 1.5A. It is suitable for applications where low noise and high efficiency are desired. This application note explains the various features and applications of the MIC4574YN device and how it works.

Application Field

The MIC4574YN is suitable for a variety of power applications, including portable electronics, computer peripherals, handheld devices and home appliances. It is particularly well suited to Battery Management Systems (BMS) and Power Management ICs (PMICs). The device is also applicable in LED driver circuits.The MIC4574YN has been designed to provide a reliable and efficient power supply, even in the most demanding conditions. The device features automatic frequency control, low input-current ripple, high efficiency operation and thermal protection. As a DC-DC switching voltage regulator, it is capable of providing a regulated output voltage with a maximum output current of 1.5A from an input voltage of 2.7 V to 5.5 V.

Features

The MIC4574YN switching voltage regulator has a number of features that make it suitable for a variety of applications. It is a monolithic device with an integrated frequency-hopping control that automatically adjusts the switching frequency for optimal performance. The device also offers short circuit protection, over voltage protection and thermal shutdown to ensure reliable operation in harsh environments. The integrated frequency hopper also provides a low quiescent current of 35uA.The MIC4574YN also features low input-current ripple, which allows it to operate in environments with high levels of electromagnetic radiation. The device also offers good load and line regulation, a high-side drive as well as an output voltage range of up to 5.5V.

Working Principle

The MIC4574YN is a low-cost, efficient and easy-to-use DC-DC switching voltage regulator. It consists of two major components: an integrated driving element, and a switching element.The integrated driving element works by varying the on/off duty cycle of the switching element. The duty cycle is controlled by an adjustable internal control voltage and applied to the PWM MOSFET (metal oxide semiconductor field effect transistor) as a gate drive. The PWM MOSFET then switches the power MOSFETs, allowing current to flow through the inductor and convert the input voltage to a regulated, filtered output voltage.The MIC4574YN also features an integrated frequency-hopping control that adjusts the output frequency of the device to optimize the performance of the power MOSFETs. This helps to ensure improved efficiency, low input-current ripple and good line and load regulation.

Conclusion

The MIC4574YN is a low-cost and highly efficient DC-DC switching voltage regulator manufactured by Microchip Technology. It is suitable for applications where low noise and high efficiency are desired, including Battery Management Systems (BMS) and Power Management ICs (PMICs). The device features automatic frequency control, low input-current ripple, high efficiency operation and thermal protection. Its integrated frequency hopper also provides a low quiescent current of 35uA. The MIC4574YN is an ideal choice for applications that require high performance and reliability.

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