LM2576S-ADJ

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LM2576S-ADJ

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SWITCHING REGULATOR, VOLTAGE-MOD

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Présentation

Description

The LM2576S-ADJ is a versatile step-down voltage regulator designed by Texas Instruments. It is part of the LM2576 series, which is known for efficiency and simplicity in DC-DC conversion applications. This specific model, denoted by "ADJ," offers an adjustable output voltage, making it suitable for various custom voltage requirements. It can deliver an output current of up to 3A with a wide input voltage range, typically from 4V to 40V, accommodating numerous power sources.
Key features include a high-efficiency performance typically around 77-88%, a fixed switching frequency of 52 kHz to minimize noise and electromagnetic interference, and built-in thermal shutdown and current limit protection for enhanced reliability. The LM2576S-ADJ is easy to use, requiring only a few external components, such as an inductor, a diode, and capacitors, to function. Its TO-263 package helps in efficient heat dissipation, making it suitable for applications in battery-powered devices, power supply units, and industrial equipment requiring reliable and adjustable voltage regulation.

Equivalent

The LM2576S-ADJ is a DC-DC step-down voltage regulator. Equivalent products include the LM2596S-ADJ which offers similar functionality and pin compatibility. Other alternatives include the L78S40, L4970Aand MC34063A, though they may differ in features or performance specifications. Always compare electrical characteristics, package type, and thermal parameters to ensure compatibility with your specific application.

Features

The LM2576S-ADJ is a versatile DC-DC step-down voltage regulator. Key features include:
1. Adjustable Output Voltage: Offers an adjustable output range from 1.23V to 37V with a fixed 52 kHz switching frequency.

2. High Efficiency: Capable of achieving up to 90% efficiency, making it suitable for power-sensitive applications.
3. Output Current: Supports up to 3A of output current, making it ideal for various power applications.
4. Simple Design: Requires minimal external components, simplifying circuit design and reducing PCB space.
5. Heat Management: Equipped with thermal shutdown, current limiting, and overvoltage protection for reliable operation.
6. Wide Input Voltage Range: Operates efficiently across a wide input voltage range from 4V to 40V.
7. Low Standby Current: Features a low standby current for energy efficiency in idle states.
8. Various Packages: Available in different packages, such as TO-220 and TO-263, providing flexibility for different design requirements.
These features make the LM2576S-ADJ suitable for a broad range of applications, including battery-powered devices, embedded systems, and industrial electronics.

Pinout

The LM2576S-ADJ is a 5-pin adjustable switching voltage regulator. It is designed for simple and efficient step-down (buck) voltage regulation. The pin functions are as follows:
1. VIN: This pin is the input voltage supply, where the input voltage is connected to power the regulator.
2. Output: This pin is the regulated output voltage, where the load is connected.
3. Feedback (FB): This pin is used to set the output voltage by connecting it to a voltage divider from the output.
4. ON/OFF: An optional pin for enabling or disabling the regulator. Pulling it low shuts the regulator down, reducing supply current to a few microamperes.
5. Ground (GND): This pin is the ground connection for the input voltage and output voltage.
The LM2576S-ADJ supports an adjustable output voltage by setting the appropriate resistive divider connected to the feedback pin. It is commonly used in power supply applications requiring efficiency and simplicity.

Manufacturer

The LM2576S-ADJ is manufactured by Texas Instruments. Texas Instruments, often abbreviated as TI, is an American technology company that designs and manufactures semiconductors and various integrated circuits. It is one of the largest semiconductor companies in the world. TI primarily focuses on developing analog chips and embedded processors, which are used in a wide range of electronic devices. The company is known for its innovation in the semiconductor industry and provides components critical for electronics such as calculators, digital signal processors, microcontrollers, and power management systems.

Application

The LM2576S-ADJ is a versatile adjustable voltage regulator commonly used in applications requiring efficient step-down voltage conversion. Key application areas include power supplies for industrial equipment, battery-operated devices, and automotive systems. It's also employed in telecommunication circuits, distributed power systems, and as a component in DC-DC converter modules. The regulator's efficiency and simplicity make it suitable for maintaining stable power levels in various electronic devices and systems.

Package

The LM2576S-ADJ is a step-down voltage regulator with an adjustable output. It comes in a TO-263 package, which is a surface-mount package type. This package is designed for efficient thermal performance and ease of mounting on a PCB.

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