The LM2596 series of regulators are monolithic integrated circuits designed for step-down (buck) switching applications. They are capable of driving a 3-A load with exceptional line and load regulation.
Available in fixed output voltages of 3.3 V, 5 V, and 12 V, as well as an adjustable output version, these regulators support an input voltage range of up to 40 V.
Key features include:
| Pin | Name | Description |
|---|---|---|
| 1 | VIN | Positive input supply for the IC switching regulator. Requires an input bypass capacitor to minimize voltage transients. |
| 2 | Output | Internal switch. The voltage at this pin switches between (+VIN − VSAT) and approximately −0.5 V, with a duty cycle of VOUT / VIN. |
| 3 | Ground | Circuit ground |
| 4 | Feedback | Senses the regulated output voltage to complete the feedback loop. |
| 5 | ON/OFF | Logic input that allows the switching regulator circuit to be shut down, reducing input supply current to approximately 80 µA. |