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LM2596 Buck Converter (1.25–35 V, 3 A)

Efficient adjustable step-down converter: 4–40 V in, 1.25–35 V out, up to 3 A peak. Turn a 12 V adapter or battery pack into a clean 5 V or 3.3 V supply for your boards.

Regulator IC
LM2596S-ADJ
Input Voltage
4–40 V DC
Output Voltage
1.25–35 V (adjustable)
Output Current
2 A continuous, 3 A peak
Switching Frequency
150 kHz
Efficiency
Up to about 90 %
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Specifications

Manufacturer Part Number
LM2596S-ADJ
Regulator IC
LM2596S-ADJ
Input Voltage
4–40 V DC
Output Voltage
1.25–35 V (adjustable)
Output Current
2 A continuous, 3 A peak
Switching Frequency
150 kHz
Efficiency
Up to about 90 %
Dropout
About 1.5 V minimum (IN − OUT)
Adjustment
Multi-turn potentiometer
Board Size
43 × 21 × 14 mm

Downloads

Description

A linear regulator like the 7805 wastes the extra voltage as heat. The LM2596 is a switching regulator – it converts it efficiently (up to about 90 %), so it stays cool even when stepping 24 V down to 5 V.

Features

  • Texas Instruments–type LM2596S-ADJ switching regulator, 150 kHz
  • Input 4–40 V DC, output adjustable 1.25–35 V
  • Output current 2 A continuous, 3 A peak (add a heatsink above 2 A)
  • Multi-turn trimpot for fine voltage setting
  • Solder pads IN+ / IN− / OUT+ / OUT−

How to set the voltage

Connect the input supply and a multimeter on the output, then turn the brass screw of the blue trimpot – it takes many turns, so keep going if nothing seems to change. The input must be at least about 1.5 V higher than the output. Set the voltage before connecting your board.

Package includes

1 × LM2596 buck converter module