LM2596S-5V 3A 5V Fixed Step-Down DC-DC Regulator, TO-263 SMD
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Prices updated: 13 Oct 2026
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About this product
LM2596S-5V is a step-down (buck) switching regulator IC in a TO-263 surface-mount package, with a fixed 5 V output and up to 3 A load current. It switches at about 150 kHz, which allows smaller filter components than lower-frequency regulators. Used to derive a 5 V rail from a higher DC input such as a 12 V or 24 V supply.
Specifications
- Output voltage
- 5 V fixed
- Output current
- 3 A (max)
- Input voltage
- 4.5 V to 40 V
- Switching frequency
- 150 kHz
- Topology
- Step-down (buck)
- Package
- TO-263 (SMD)
Frequently asked questions
Does it work on its own or does it need external parts?
It needs external components as specified in its datasheet: an input capacitor, an output inductor, a catch (freewheeling) diode, and an output capacitor. The number of external parts is small, but they are required for correct operation.
What input voltage can I use?
The input must always be higher than the 5 V output, since this is a step-down regulator and cannot boost. The datasheet input range is 4.5 V to 40 V, so keep enough headroom above 5 V for the regulator to hold its output.
