LM2574HVM-3.3

Voltage - Output (Min/Fixed):	3.3V
Base Part Number:	LM2574
Supplier Device Package:	14-SOIC
Package / Case:	14-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:	500mA
Voltage - Output (Max):	--
Series:	SIMPLE SWITCHER®
Voltage - Input (Max):	60V
Voltage - Input (Min):	4V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Obsolete
Packaging:	Tube

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Introduction to LM2574HVM-3.3 Application Field and Working Principle The LM2574HVM-3.3 is a switching Step-Down Regulator, designed to allow regulated voltage source from +5V to +15Vdc input, providing a regulated output of 3.3Vdc with 250mA maximum output current. It is a high-performance linear regulator created for industrial, automotive and aerospace applications, where voltage regulation and efficiency are important factors. It provides unique features such as wide input voltage range, low-profile packages, low power consumption, low noise, high output voltage accuracy, an integrated junction-temperature monitor, overvoltage protection, and input overcurrent protection.Features and Advantages of LM2574HVM-3.3 The LM2574HVM-3.3 is a switching step-down regulator offering several features, including a wide input voltage range of +5V to +15Vdc, with a regulated output voltage of 3.3V at 250mA maximum current. The device features low quiescent current, low output noise and ripple, high output voltage accuracy and low dropout voltage. It also contains input overcurrent and overvoltage protection for enhanced stability. The device is provided in a SOT-23 package for space-saving applications and has an integrated junction-temperature monitor for improved reliability. Application Fields of LM2574HVM-3.3The LM2574HVM-3.3 is designed for industrial, automotive and aerospace applications where a stable and accurate output voltage is required. It can also be used in various electronic and electrical systems, such as portable and battery-powered devices, automotive electronics, wireless communications systems and avionics systems. Working Principle of LM2574HVM-3.3 The LM2574HVM-3.3 is a negative-feedback, switching step-down regulator with internal power MOSFETs. The device consists of a voltage reference, an error amplifier, and a pulse-width-modulated (PWM) controller with one internal power MOSFET and a Schottky diode. The PWM Controller has an input voltage range of +5V to +15V and an output voltage of 3.3V with a maximum continuous output current of 250mA. The integrated feedback voltage is compared to the reference voltage, which is typically set to 3.3V, and drives the PWM controller to regulate the output voltage. The TON setting, set by an external resistor, controls the minimum switch on-time, allowing the output voltage accuracy to be maintained throughout the output current range. The internal power MOSFET acts as a switch to enable the current to flow through the output voltage path when the device is ON, while the Schottky diode connected in parallel with the power switch helps to maintain the output voltage when the device is OFF. The LM2574HVM-3.3 also provides input overcurrent and overvoltage protection for enhanced stability. Conclusion The LM2574HVM-3.3 is a high-performance step-down switching regulator designed for industrial, automotive and aerospace applications requiring low noise, high output voltage accuracy and reliability. The device can provide a regulated output voltage of 3.3V with 250mA maximum continuous current, and has wide input voltage range, input overcurrent and overvoltage protection, an integrated junction temperature monitor, and low-profile packages. It is suitable for use in portable and battery-powered devices, automotive electronics, wireless communications systems, and avionics systems.

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