Hi Guys! Welcome you on board. Happy to see you around. In this post today, I’ll detail the Introduction to LM2596.LM2596 is a step-down voltage regulator, also known as buck convertor, mainly used to step down the voltage or to drive load under 3A. It carries the remarkable load and line regulation and is available in fixed output voltages including 3.3V, 5V, 12V. It also comes with a customized output version where you can set the output voltage as per your requirement.Just stay with me for a little while, as in this post I’ll walk you through the Introduction to LM2596 covering the datasheet, pinout, features, and main applications of this tiny device.Let’s jump right in.
Introduction to LM2596
LM2596 is a voltage regulator mainly used to step down the voltage or to drive load under 3A.
It is also known as DC-to-DC power converter or buck converter which is used to step down the voltage from its input supply to the output load. The current goes up during this voltage step down process.
LM2596 comes with a remarkable load and line regulation. It is available in both versions: fixed output voltage version with 3.3V, 5V, 12V, and customized output version where you can choose the output as per your requirement.
This regulator is incorporated with a fixed-frequency oscillator and an internal frequency compensation method.
Frequency compensation is applied by adjusting both phase and gain characteristics of the open-loop output to avoid oscillation and vibration in the circuit. This is achieved with the help of resistance-capacitance networks.
A minimum number of external components are required for this regulator that works at a fixed frequency of 150 kHz.
It is available in surface mount package TO-263 and standard 5-pin package TO-220.
LM2596 Datasheet
Before you use this device for your electrical project, it’s wise to have a look at its datasheet that gives you an overview of the main characteristics of the component.Click below to download the datasheet of LM2596.
LM2596 Pinout
The following figure shows the pinout diagram of LM2596.The LM2596 comes with total five pins as follow:Vin = I = this is the input supply pin interlaced with the input bypass capacitor to provide the switching current and to reduce voltage transients.Output = O = this is the internal switch with voltage switches between (Vin – Vsat) and -0.5V. It comes with a duty cycle of Vout/Vin. The PCB copper area attached to this pin is used to minimize the coupling.
Lm2596 Circuit Voltage Regulator And Datasheet Eleccircuit Com Lm2596 Typical Application Reference Design Dc To Dc Single. Arduino Mega 2560 Driver Download.
LM2596-33 (Limits) Units Typ Limit (Note3) (Note4) SYSTEMPARAMETERS(Note5)TestCircuitFigure2 VOUT OutputVoltage 475V s VIN s 40V02A s ILOAD s 3A 33 V 3168 3135 V(min) 3432 3465 V(max) h Efficiency VIN e 12VI LOAD e 3A 73% LM2596-50 Electrical Characteristics Specifications with standard type face are for TJ e 25§C and those with boldface.
Buck/Step down Switch mode power supply supports wide range input voltage, from 3.2V to 46V. The output voltage (1.25V to 35V) is adjustable with on board multiturn potentiometer, and maximum continuous output current is 2A.
Old version datasheet LM2596 SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator: LM2596SX-3.3 Old version datasheet LM2596 SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator: LM2596SX-5.0 Old version datasheet LM2596 SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator: LM2596SX-ADJ.
This item Ultra-Small LM2596 Power Supply Module DC/DC Buck 3A Adjustable Buck Module Regulator Ultra LM2596S Compatible with Arduino by Atomic Market (6 Pcs) MCIGICM LM2596 Buck Converter, DC to DC 3.0-40V to 1.5-35V Step Down Power Supply High Efficiency Voltage Regulator Module.
Ground = this pin is connected to the ground.Feedback = I = this pin identifies the regulated output voltage for the feedback loop.ON/OFF = I = this pin is used to shut down the voltage regulator circuit with input supply current reducing to 80uA. When the voltage on this pin goes below the threshold voltage of 1.3V, it turns on the buck converter. And when the voltage goes above the 1.3V, it turns off the converter. You can get rid of this shutdown feature by attaching the pin to the ground or leaving it open. In both cases, the regulator remains ON.
LM2596 Features
Fixed versions i.e. 3.3-V, 5-V, 12-V, and customizable output versions
Customizable output version with voltage range: 1.2-V to 37-V ±4% maximum over load and line conditions
Available in two packages including TO-263 and TO-220 packages.
Can drive load under 3A.
40 V is the input voltage range
4 external components are needed
Remarkable load and line regulations
Internal oscillator with a fixed frequency of 150 kHz
TTL shutdown capability
Comes with low power standby mode, commonly 80 μA
High efficient and readily available
Protection against thermal shutdown and current
LM2596 Power Ratings
The following table represents the absolute maximum ratings of regulator LM2596.Absolute Maximum Ratings LM2596
No.
Rating
Value
Unit
1
Maximum Supply Voltage
45
V
2
SD/SS Input Voltage
6
V
3
Delay Pin Voltage
1.5
V
4
Flag Pin Voltage
45
V
5
Feedback Pin Voltage
25
V
6
Output Voltage to Ground
-1
V
7
Storage Temperature
-65 to 150
C
While working with this component, make sure stresses don’t exceed the absolute maximum ratings, else they can permanently damage the component.
Plus, if stresses are applied for more than the required time, they can affect device reliability.
LM2596 Applications
Used to step down voltage
Can drive load under 3A
Provide remarkable load and line regulation
That’s all for today. I hope you find this read helpful. If you’re unsure or have any questions, you can leave your query in the section below, I’d love to help you the best way I can. You’re most welcome to share your feedback and suggestions, they help us create quality content. Thank you for reading the article.
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Lm2596 Adjustable Voltage Regulator
Syed Zain Nasir
@syedzainnasir
I am Syed Zain Nasir, the founder of The Engineering Projects (TEP).I am a programmer since 2009 before that I just search things, make small projects and now I am sharing my knowledge through this platform.I also work as a freelancer and did many projects related to programming and electrical circuitry. My Google Profile+
Short circuit protection: current limiting, since the recovery
Operating temperature: Industrial grade (-40 to +85 ) (output power 10W or less)
Full load temperature rise: 40
Load regulation: ± 0.5%
Voltage regulation: ± 2.5%
Dynamic response speed: 5% 200uS
Input voltage:4.5-40V
Output voltage:1.5-35V(Adjustable)
Output current:Rated current is 2A,maximum 3A(Additional heatsink is required)
Dimension:43*20*14mm(L*W*H)
The LM2596 regulator is monolithic integrated circuit ideally suited for easy and convenient design of a step−down switching regulator (buck converter). It is capable of driving a 3.0 A load with excellent line and load regulation. This device is available in adjustable output version and it is internally compensated to minimize the number of external components to simplify the power supply design.
Since LM2596 converter is a switch−mode power supply, its efficiency is significantly higher in comparison with popular three−terminal linear regulators, especially with higher input voltages. The LM2596 operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Available in a standard 5−lead TO−220 package with several different lead bend options, and D2PAK surface mount package.
Datasheet PDF : [ TI LM2596-ADJ.PDF , Onsemi LM2596-D.PDF ]