The LM2678 is a high‑efficiency 5 A step‑down (buck) switching regulator. It integrates all active functions needed for a complete power supply design, including a low‑ON‑resistance DMOS power switch, thermal shutdown, current limiting, and an ON/OFF control input.
The document provides electrical characteristics, absolute maximum ratings, typical performance graphs, pin descriptions, package dimensions, and ordering information for both TO‑263 and TO‑220 packages, along with application hints and design considerations.
| Fixed output voltages | 3.3 V, 5 V, 12 V |
|---|---|
| Maximum output current | 5 A |
| Efficiency | up to 92 % |
| Input voltage range | 8 V to 40 V |
| Switching frequency | 260 kHz (fixed) |
| Standby quiescent current (OFF) | 50 pA |
The standby quiescent current is 50 pA.
The regulator uses a fixed 260 kHz oscillator.
The regulator is guaranteed to operate with an input voltage between 8 V and 40 V.