Voltage - Output (Min/Fixed):	1.23V
Base Part Number:	LM2575
Supplier Device Package:	24-SOIC
Package / Case:	24-SOIC (0.295", 7.50mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	52kHz
Current - Output:	1A
Voltage - Output (Max):	37V
Series:	SIMPLE SWITCHER®
Voltage - Input (Max):	40V
Voltage - Input (Min):	4V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LM2575MX-ADJ/NOPB Application Field and Working Principle

Introduction

The LM2575MX-ADJ/NOPB is a wide input voltage range (3V to 40V) monolithic integrated step-down switching regulator capable of driving up to 3A loads with excellent load and line regulation. This regulator is available in a variety of fixed output voltages making it useful in a wide range of applications. It features an adjustable frequency, low power standby mode, short-circuit and thermal shutdown protection, and a typical efficiency of 90%. The LM2575MX-ADJ/NOPB enables excellent performance in applications that require high input voltage and high output current.

Application Field

The LM2575MX-ADJ/NOPB is ideal for use in a wide range of applications such as cellular phones, laptop and tablet computers, automotive applications, industrial instrumentation and motor control. It is well suited for powering processors, FPGAs, DSPs and other integrated circuits.The device can be used in regulated supplies for a wide range of loads and it can also be used in switching pre-regulators for linear supplies. Additionally, the LM2575MX-ADJ/NOPB can be used to step down voltages and boost current with excellent efficiency and no-hassle replacements for linear regulators.For applications where lines and loads require large transient currents, the LM2575MX-ADJ/NOPB is a perfect choice. The device’s low output voltage drop, adjustable frequency, short circuit shutoff and thermal shutdown protect the application from unexpected occurrences.

Working Principle

The LM2575MX-ADJ/NOPB switching regulator has a wide input voltage range of 3V to 40V, making it suitable for high power applications. It is an integrated, monolithic device consisting of two MOSFETs, an oscillator, output rectifier, error amplifier and voltage reference.The device employs a buck topology design to regulate the output voltage and current. The two MOSFETs alternately switch at a frequency determined by the external frequency control pin. The oscillator determines the switching frequency and the duty cycle of the switch. The output voltage is regulated by sensing the voltage across the current sense resistors and using this data to control the internal pulse width modulator.The LM2575MX-ADJ/NOPB provides short-circuit and thermal shutdown protection against unexpected occurrences. The thermal shutdown detection based on the die temperature of the device, and when it exceeds approximately 150°C, the device shuts down to protect itself.

Conclusion

The LM2575MX-ADJ/NOPB is an integrated, monolithic switching regulator with wide input voltage range and high output current capabilities. It is well-suited for powering high power applications such as processors and FPGAs, and is also useful for automotive, industrial and motor control applications. The device is highly efficient, offering up to 90% efficiency. Additionally, the device offers excellent protection against unexpected occurrences with its thermal shutdown and short circuit protections.

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