Adjustable step-down output set by a multi-turn trimmer potentiometer
In stock
Buck Boost
LM2596 DC-DC Buck Converter Step-Down Module
Adjustable step-down regulator, 4-40V in to 1.25-37V out, up to 3A load.
₹75 + 18% GST
SKU: BOTBIT-PWR-05 · Best for: Stepping 12V down to 5V or 3.3V for Arduino/ESP projects
Overview
About LM2596 DC-DC Buck Converter Step-Down Module.
The LM2596 DC-DC buck converter is the workhorse adjustable step-down regulator of the maker world. It takes a higher DC input and efficiently drops it to a lower, adjustable output using a switching regulator, so it runs far cooler and wastes far less energy than a linear regulator would for the same job.
A multi-turn trimmer potentiometer sets the output anywhere from about 1.25V to 37V, and the module accepts inputs from roughly 4V to 40V while delivering up to 3A (with a heatsink recommended above ~1.5-2A of continuous load). This makes it the default choice for stepping 12V down to 5V for logic, or a car's 12-14V down to charge and power projects.
At around Rs 75 it is one of the most cost-effective and widely stocked power modules in India. It is the go-to answer whenever a project needs a clean, adjustable voltage from a battery pack, adapter or vehicle supply.
Key features
Why it stands out.
Wide input range of about 4V to 40V DC
Output adjustable from 1.25V up to 37V
Up to 3A output current (heatsinking advised above ~1.5A continuous)
High switching efficiency, typically up to ~92%
Compact board with input/output solder pads or screw points
Specifications
Selection facts.
| Regulator IC | LM2596S |
|---|---|
| Input voltage | 4V to 40V DC |
| Output voltage | 1.25V to 37V (adjustable) |
| Output current | Up to 3A (2A continuous recommended) |
| Conversion efficiency | Up to ~92% |
| Switching frequency | 150kHz (fixed) |
| Adjustment | Multi-turn potentiometer |
| Load/line regulation | Typ ±0.5% (load), ±2.5% (line) |
| Board size | Approx 43 x 21 x 14mm |
Applications
Where it is used.
- Stepping 12V down to 5V or 3.3V for Arduino/ESP projects
- Powering logic and modules from a battery pack or DC adapter
- Automotive 12-14V to 5V USB or device supply
- Charging circuits and adjustable bench-power experiments
- LED driving at a set voltage on a breadboard project
- Replacing hot, wasteful linear regulators (7805 etc.)
Buying guide
How to choose.
Choose the LM2596 when you need an inexpensive, reliable adjustable step-down and your load is up to about 2-3A. Always set the output voltage with a multimeter on the trimmer before connecting your circuit, because the pot has many turns and the output can start high.
The output must always be lower than the input (this is a buck-only converter, it cannot boost). If your source can drop below your target output, for example a LiPo sagging under load, choose a boost (MT3608) or buck-boost (XL6009) module instead. For sustained loads above ~1.5A add a heatsink or pick the higher-current XL4015.
Pair it with a multimeter for setting the voltage, and screw terminals or a barrel jack for tidy input/output connections.
FAQ
Common questions.
Can it output 5V from a 12V input?
Yes, that is one of its most common uses. Feed 12V in, turn the trimmer while measuring with a multimeter until you read 5.0V out, then connect your load. It handles 3.3V, 5V, 9V and other targets the same way.
Can it step voltage up?
No. The LM2596 is a buck (step-down) converter only. The output is always lower than the input. For stepping up use an MT3608 boost or an XL6009 buck-boost module.
How do I set the output voltage?
Turn the small multi-turn brass screw on the blue potentiometer while measuring the output with a multimeter. It takes several turns; set the voltage before connecting your sensitive circuit.
Do I need a heatsink?
For light loads no. For continuous currents above roughly 1.5-2A the IC gets warm, so a small heatsink and airflow are recommended. For heavier steady loads consider the XL4015 5A module.
Is it available in India?
Yes, the LM2596 module is one of the most commonly stocked power modules in India and ships nationwide from BotBit.
More in Power & Prototyping
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Buck Boost
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High-current adjustable step-down module, 4-38V in to 1.25-36V out, 5A with heatsink.
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