LM2575 Buck Converter Datasheet, Pinout, Features, Applications
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.
Introduction to LM2575
Hello everyone! I hope you all will be absolutely fine and having fun. Today, I am going to give you an elaboration on
Introduction to LM2575. LM2575 is specially designed to simply the design of switching power supplies. It can be done by providing all the necessary active functions required in Integrated Circuit (IC) for step down regulators. LM-2575 can deliver load current of around 1A along with the good line regulation as well as load regulation. LM 2575 has different builtin functions e.g. frequency compensation, cycle by cycle current limiting, oscillator with the fixed frequency and a lot more.
LM-2575 has many amazing features i.e. it can reduce the heat sink size due to its higher efficiency parameter. In some cases even heat sink is not required. There are several different features including wide output voltage range, high efficiency, wide input voltage ranges, thermal shutdown, TTL shutdown, particular 1A output current. Moreover, LM-2575 has a lot of different applications e.g. high efficiency step down regulator, pre regulator for linear regulators, on card switching regulators, positive to negative converters also known as buck boost. The further detail about LM-2575 will be given later in this tutorial.
Introduction to LM2575
LM2575 is designed for simplifying the design of switching power supplies. We can do it by providing the active functions necessary for step down regulators. It can deliver a load up to 1 ampere current. Its builtin features include internal frequency compensation, cycle by cycle current limiting, fixed frequency oscillator etc. It can be used in on card switching regulators, positive to negative regulators. LM-2575 is shown in the figure given below.
1. LM2575 Pins
- LM 2575 has five (5) pins in total, having different functions.
- These pins are listed in the figure shown below.
2. LM2575 Pins Description
- Pins functions are necessary to be known for the use of any device.
- These pin functions are listed in the function given below.
3. LM2575 Pinout
- Pin configurations can be understand from pinout diagram of any of the electronic device.
- LM-2575 pinout diagram is shown in the figure given below.
4. LM2575 Package
- The different package numbers are assigned to different versions of the same device.
- LM-2575 package is shown in the table given below.
5. LM2575 Package Dimension
- Each package of a device is assigned with the different unique dimension,
- LM-2575 has only a single package and its dimension is shown in the table shown in the figure below.
6. LM2575 Symbolic Representation
- Internal structure of a device can be estimated through its symbolic form.
- LM 2575 symbolic form is given in the figure shown below.
7. LM2575 Ratings
- Before using any device, we must know about its power requirements.
- These power requirements can be estimated from its ratings.
- LM-2575 ratings are listed along with their units in the table shown in the figure given below.
8. LM2575 Features
- Unique features of a device can make it efficient for a lot of purposes.
- LM 2575 features are provided in the table given in the figure shown below.
9. LM2575 Applications
- LM 2575 can be used at several different places in real life.
- Its some of the most common applications are given in the table shown below.
The tutorial
Introduction to LM2575 has thoroughly explained the methods and necessary information about the basic and simple use of the integrated circuit named as LM-2575. I have tried my level best to cover up all the desire information about its basic use, if you find something missing, please do tell me in comments so that I can update it accordingly. I will share further topics in my upcoming tutorials. So, take care till then and bye :)