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LM2596 Step-Down Adjustable DC-DC Switching Buck Converter
LM2596 Step-Down Adjustable DC-DC Switching Buck Converter


 
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Price: $2.20

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Product Code: AD281
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This module features the adjustable LM2596 step-down (buck) switching regulator, capable of driving a 3A load with excellent line and load regulation.

This module has a multi-turn trimpot (potentiometer) that you can use to adjust the LM2596's output voltage. Since the trimpot has 25 turns of adjustment you can easily adjust the output of the module to exactly the voltage you need.

The simplest way to reduce the voltage of a DC supply voltage is to use a linear voltage regulator (LDO), but linear regulators step down voltage by dissipating the excess energy as heat and do not yield any current step up. Buck converters, on the other hand, can be remarkably efficient and provide a step up in current output. Buck converters are one of the best ways to provide a regulated voltage from a battery since they don't waste near as much energy in the process of dropping the input voltage as a linear regulator would waste.

As an example of the characteristics of this module, Addicore ran a test with a 15V supply input and the output of the module adjusted to 5V with a 100 ohm load connected on the output. The input current was 24.8 mA, while the output current was 47.84 mA. That is nearly double the input current. You won't ever see that happen with a linear voltage regulator. We were able to change the input supply voltage down to 6.5V before the output voltage started to dip below 5V. The output voltage was still 4.99V, even with the input supply voltage at 6V. As we were adjusting the input supply voltage, the output didn't waiver a bit until around the 6.5V mentioned before and we didn't have to adjust the trimpot at all for the LM2596 to maintain the same output voltage. That is a perfect example of why switching buck converters can be such a great way to convert DC voltages.

If you need to increase (step-up) a voltage consider using a boost converter such as our MT3608 boost converter module.

IMPORTANT: This module has an on-board power indicator LED connected on the module's output. This LED has a 1k ohm resistor in series with it as a current limiting resistor. If you adjust the module for an output voltage over 12V we recommend removing the LED or swapping the 1k ohm resistor for a higher resistance to prevent the resistor from getting too hot and to protect the LED from damage.

Product Contents:
  • 1 — LM2596 Adjustable Switching Buck Converter Module
Specifications:
Input Voltage 3 to 40 V
Output Voltage Range 1.23 to 37 V
Max Output Current 3 A
Adjustment 25-Turn Trimpot
Efficiency up to ~93%
Switching Frequency 150 kHz
Built-In Protection thermal shutdown and current limit
Dimensions:
Length 43.2 mm (1.701")
Width 21 mm (0.827")
Height 14 mm (0.551")
Weight 11.23 g (0.396 oz)

Average Rating: 5 of 5 Total Reviews: 5 Write a review

  0 of 0 people found the following review helpful:
 
Great product and quickly shipped. March 19, 2018
By: ted frohling from Tucson, AZ United States  
These step down converters are just great.  Didn't realize they came with a power indicator LED, which is just great.  I also liked the fact that they came set at about 5 volts so no surprises if someone just hooks them up without checking first.

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  0 of 0 people found the following review helpful:
 
LM2596 Buck Converter February 20, 2017
By: Tom Richins from Farmington, UT United States  
These work wonderfully in powering a self contained system with available line power.

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  0 of 0 people found the following review helpful:
 
great custom adjustable power supply December 10, 2016
By: DAVID ARDUINI from Erie, PA United States  
these are great... not previously possible to have a reliable solution without a custom PCB.  Great product!

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  0 of 0 people found the following review helpful:
 
Work well and are small in size October 6, 2016
By: Justin Pittman from MISSION HILLS, CA United States  
I have two of these mounted to an rc car each driving a 3w led sold here. They get warm but not too warm and provide plenty of power for the leds without cutting out. Using a 3V3 ldo regulator was not working out as they'd overheat and cause LEDs to flicker and totally cut out at times.

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  0 of 0 people found the following review helpful:
 
Great Little Board August 23, 2016
By: Aaron Norris from Provo, UT United States  
I've used these to drive my 3W LEDs. Coupled with a power brick from the second-hand store or the AC-DC power bricks from Addicore, these are great little driver boards.

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