LM2574N-015

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The LM2574N-015 is a monolithic integrated circuit designed for step-down (buck) switching regulators, providing excellent line and load regulation. It is capable of driving a 3A load with excellent line and load regulation. The device is rated over the extended -40°C to +125°C junction temperature range. The LM2574N-015 features a 3A internal switch, low external component count, low ripple and noise, and a wide input voltage range. It is available in a 4-pin SOP package.

The LM2574N-015 uses fixed-frequency, pulse width modulation (PWM) control to maintain an output voltage. The operating frequency can be adjusted externally using a resistor. The duty cycle is controlled using the error amplifier. An internal compensation pin provides excellent stability and transient response. There are several shutdown/inhibit, reset/control and over-current protection features built into the device. An adjustable soft-start feature limits inrush current and prevents output transients.

Operation of the LM2574N-015 is quite simple. When operating normally, the current controlled switch (Q1) is switched rapidly off and on in response to the voltage on the Sense line. The output voltage is regulated by the error amplifier, which compares the feedback voltage and the reference voltage. When an over-current situation occurs, the output switch Q1 is disabled and LIMIT/Q2 is enabled. The current sense detected will limit the current at 1.25 times the limit voltage, VLIMIT, as determined by an external sense resistor. Once the overload condition is resolved, the output will be enabled again.

The LM2574N-015 is perfect for a wide range of DC-to-DC switching applications like telecom power supplies, distributed power architectures and battery-powered systems. It is also suitable for a variety of industrial, automotive and lighting applications. The device is pin- and function-compatible with all standard versions of the LM2574, making it an ideal upgrade or replacement.

The LM2574N-015 uses relatively low component counts and provides excellent line and load regulation, making it ideal for low component cost and high efficiency applications. Its 3A internal switch can be used to drive high power outputs, while its low noise and ripple make it suitable for sensitive load applications. Its versatile package and wide operating temperature range make it well suited for a range of applications.

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