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LM2596S DC-DC Adjustable Step-Down Power Supply Module 3A Regulator Board
LM2596S DC-DC Adjustable Step-Down Power Supply Module 3A Regulator Board
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LM2596S DC-DC Adjustable Step-Down Buck Converter — 3A, Power Supply Regulator Module
A DC-DC step-down (buck) converter module based on the Texas Instruments LM2596S switching regulator IC, providing adjustable output voltage from 1.25V to 37V at up to 3A continuous output current from a 4.5V–40V input. The onboard trimmer potentiometer allows continuous output voltage adjustment. The LM2596S operates at a fixed 150kHz switching frequency, providing a good balance between efficiency, component size, and output ripple. Suitable for Arduino, Raspberry Pi, and embedded system power supply, battery charging, and general-purpose DC voltage conversion.
Technical Specifications
| Parameter | Value |
|---|---|
| IC | LM2596S (Texas Instruments) |
| Topology | Buck (step-down) |
| Input Voltage | 4.5V – 40V DC |
| Output Voltage | 1.25V – 37V DC (adjustable) |
| Output Current | 3A continuous (4A peak) |
| Switching Frequency | 150kHz (fixed) |
| Efficiency | Up to 92% |
| Output Ripple | <50mV (at 3A, 12V→5V) |
| Protection | Internal current limiting, thermal shutdown |
| Adjustment | Onboard trimmer potentiometer |
| Indicator | Power LED |
| PCB Size | ~43 × 21mm |
| Certification | RoHS |
Common Voltage Conversion Reference
| Input | Output | Application |
|---|---|---|
| 12V | 5V / 3.3V | Arduino, ESP32, Raspberry Pi from 12V supply |
| 24V | 12V / 5V | Industrial 24V to 12V/5V for sensors and controllers |
| 12V | 8.4V | 2S Li-ion battery charger (CV stage) |
| 19V (laptop) | 5V | USB device charging from laptop power supply |
Typical Applications
- Arduino / ESP32 Power: Step down 12V or 9V to 5V for Arduino Uno, Mega, and ESP32 development board power supply
- Raspberry Pi Power: Step down 12V to 5.1V for Raspberry Pi 3B+/4B power supply from a 12V battery or power supply
- Battery Charging: Adjustable CV power supply for Li-ion and LiPo battery charging (set output to 4.2V for 1S, 8.4V for 2S)
- LED Driver: Constant-voltage LED driver for 12V LED strips powered from a 24V supply
- Automotive Electronics: Step down 12V vehicle power to 5V or 3.3V for in-vehicle IoT sensors and data loggers
FAQ
Q: Can the LM2596S module output more than 3A?
A: The LM2596S is rated for 3A continuous. Brief peaks up to 4A are tolerated. For loads above 3A, use a higher-current module (LM2596HV, XL4016, or MP2307) or parallel multiple modules with current sharing.
Q: Does this module need a heatsink?
A: At loads above 2A, the LM2596S IC may run warm. Attach a small heatsink to the IC for continuous 3A operation, especially when the input-output voltage difference is large (e.g., 24V in, 5V out at 3A = 57W input, 15W output, 42W dissipated).
Package Contents
- 1 × LM2596S DC-DC adjustable step-down buck converter module
