The LM2596 is a step-down (buck) switching voltage regulator capable of delivering 3A at fixed voltages (3.3V, 5V, 12V) or an adjustable version. Far more efficient than linear regulators for large voltage drops.
| Pin | Name | Function | Type |
|---|---|---|---|
| 1 | VIN | Input voltage 4.5V–40V | PWR |
| 2 | VIN | Input voltage (connected internally) | PWR |
| 3 | OUTPUT | Switching output to inductor | I/O |
| 4 | FEEDBACK | Feedback from output divider | ADC |
| 5 | ON/OFF | Enable, HIGH = off, LOW = on | I/O |