LM2575 Buck Converter Datasheet, Pinout, Features, Applications

27 - Sep - 2020

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Hi Guys! Glad to see you around. I welcome you on board. In this post today, I’ll walk through the Introduction to LM2575. LM2575 is a step-down voltage regulator mainly used to step down the voltage. It is also known as a buck converter and is used to drive load under 1A. In the customized output version of the buck converter, you can set the output voltage as you like better. It comes with an extremely good load and line regulation and is available in fixed output voltages with 3.3V, 5V, and 12V. I suggest you read this post all the way through, as in this post I’ll detail the Introduction to LM2575 covering the datasheet, pinout, features, and applications of this component LM2575. Let’s get started.

Introduction to LM2575

LM2575 is a voltage regulator and simplified version of switching power supplies that carry all functions required to step down the voltage in the circuit.
This buck converter is incorporated with an integrated switch that can support load under 1A.

LM2575 carries an excellent load line and load regulation. It comes in two versions: fixed output voltage version with voltage 3.3V, 5V, 12V, and adjustable output version that gives the ability to pick your desired output.
It is also called the DC-to-DC power converter employed to step down the voltage from its input supply to its output load. The current increases during this voltage regulation.
This regulator is integrated with a fixed-frequency oscillator of about 52 kHz and an in-built frequency compensation method.

Frequency compensation is applied to reduce vibration and oscillation in the circuit. It can be obtained using resistance-capacitance networks.
Apart from the remarkable load and line regulation, this device comes with a manual shutdown option through an external ON/OFF pin.
Less external components are needed for this buck converter since it works at a fixed frequency of 52 kHz.

LM2575 Features

Fixed versions with 3.3-V, 5-V, 12-V, and adjustable output versions
Adjustable output version with voltage range: 1.2-V to 37-V ±4% maximum over load and line conditions
Available in two packages named TO-263 and TO-220 packages.
Can drive load under 1A.
Comes with low power standby mode, commonly less than 200 µA.
Uses easily available standard inductors and is highly efficient.
4.75 to 40 V is the input voltage range.
23V to 37V is the output voltage range.

80% efficiency.
Excellent load and line regulations.
Fixed internal oscillator frequency of 52 kHz.
TTL shutdown capability.
Protection against overcurrent and thermal shutdown.

LM2575 Pinout

LM2575 comes with five terminals. The following figure shows the pinout diagram of LM2575.

ON/OFF = I = this terminal can shut down the voltage regulator circuit with input supply current decreasing to 50uA. Its working is simple and straightforward. When the voltage available on this pin is turned below the threshold voltage of 1.3V, it results in turning on the voltage regulator. And when the voltage is turned above the 1.3V, it results in turning off the voltage converter. You can remove this shutdown feature by connecting the pin to the ground or leaving it open. In both cases, the regulator will be turned ON. VIN = I = this is the 16 number input terminal attached with the input bypass capacitor to reduce voltage transients and to provide the switching current. Output = O = this is the 3 number pin that acts like an internal switch where voltage switches between (Vin – Vsat) and -0.5V. The duty cycle on this pin is Vout/Vin. The PCB copper area connected to this pin is mainly used to reduce the coupling. Ground = three pins number 5,12 & 13 are attached to the ground. Feedback = I = this is the 7 number pin that indicates the regulated output voltage for the feedback loop.

LM2575 Datasheet

Before you install this component into your project, it’s wise to scan through the datasheet that covers the main characteristics of the component. Click the link below and download the datasheet of LM2575.

LM2575 Applications

LM2575 is used in the following applications.

Used in a simple efficient step-down regulator.
Used as a pre-regulator in linear regulator
Used to drive load under 1A.
Incorporated in On-card switching regulators.
Employed in a positive-to-negative converter.

That was all about the Introduction to LM2575. Hope you find this post helpful. If you have any query, you can approach me in the section below, I’d love to help you the best way I can. Feel free to keep us updated with your valuable feedback and suggestions, they help us produce quality content customized to your exact needs and requirements. Thank you for reading the article.