LM2596S HW-411 DC-DC Step-Down Power Supply Module - Adjustable 3A Buck Converter

The LM2596S HW-411 is an adjustable DC-DC step-down power supply module built around the Texas Instruments LM2596S switching regulator, designed to convert a higher input voltage into a stable, user-adjustable output for a wide range of electronic loads. It accepts an input from 3.2V to 46V DC and delivers an output from 1.25V to 35V DC, set through an onboard multi-turn potentiometer, with a maximum output current of 3A when adequate cooling is provided. The module achieves conversion efficiency of up to 92% and maintains output ripple below 30mV, making it suitable for powering microcontrollers, communication modules such as SIM800L and SIM900, and industrial or automotive circuits that require a clean, regulated rail. Its 150kHz switching frequency allows compact filter components, and the board includes built-in over-current, over-temperature, and short-circuit protection. Measuring 43mm × 21mm × 14mm, this LM2596S power supply module uses solder pads for input and output connections and includes mounting holes for secure installation. Natural convection cooling is sufficient for moderate loads, but a heatsink is recommended when the output current exceeds 2.5A or the output power exceeds 10W. Whether the goal is to build a bench supply, regulate a 12V or 24V rail for sensors, or replace a linear regulator with a more efficient 3A step-down module, this DC-DC voltage regulator offers a practical, well-documented solution for prototyping and production.

Application

1. Powering microcontrollers, sensors, and logic circuits from 12V or 24V sources.
2. Supplying SIM800L, SIM900, and other communication modules with a stable regulated rail.
3. Driving LED strips, relays, and small motors in DIY and industrial projects.
4. Battery charging experiments and solar-powered embedded nodes requiring adjustable output.
5. Bench testing, field repairs, and custom enclosures where a compact 3A step-down module is needed.

Specifications

1. Model: LM2596S HW-411
2. Regulator IC: Texas Instruments LM2596S
3. Input voltage: 3.2V to 46V DC
4. Output voltage: 1.25V to 35V DC (adjustable via potentiometer)
5. Maximum output current: 3A (heatsink required above 2.5A or 10W)
6. Maximum output power: 15W
7. Conversion efficiency: up to 92%
8. Output ripple: less than 30mV
9. Switching frequency: 150kHz
10. Operating temperature: -40°C to +85°C (module); -40°C to +125°C (LM2596S IC)
11. Protections: over-temperature, over-current, short-circuit
12. Cooling: natural convection; heatsink recommended for high loads
13. Connections: solder pads for input and output
14. Mounting: screw holes for secure installation
15. Dimensions: 43mm × 21mm × 14mm (length × width × height)