The LM2678 is a high-efficiency 5A step-down voltage regulator from TI. It integrates all active functions and can drive a 5A load with excellent line and load regulation characteristics. The regulator uses a low on-resistance DMOS power switch to achieve high efficiency of up to 92%. The series includes fixed output voltages of 3.3V, 5V, and 12V, as well as an adjustable output version.
The LM2678 series provides a monolithic high‑efficiency step‑down (buck) regulator capable of delivering up to 5 A. It integrates a low‑ON‑resistance DMOS power switch, internal oscillator, thermal shutdown, current limiting and an ON/OFF control input.
The device is offered in fixed 3.3 V, 5 V and 12 V versions as well as an adjustable version, with a wide input voltage range of 8 V to 40 V and operation from –40 °C to 125 °C. Typical applications include system pre‑regulators, battery chargers and other high‑efficiency power supplies.
| Output Voltage (fixed versions) | 3.3 V, 5 V, 12 V |
|---|---|
| Adjustable Output Range | 1.2 V to 37 V |
| Maximum Output Current | 5 A |
| Efficiency | up to 92 % |
| Input Voltage Range | 8 V to 40 V |
| Standby Quiescent Current (OFF) | 50 pA |
| Switching Frequency | 260 kHz (fixed) |
| Operating Temperature Range | -40 °C to 125 °C |
The LM2678 operates with an input voltage between 8 V and 40 V.
When the regulator is turned OFF, it draws only 50 pA of standby current.
The device uses a fixed internal oscillator at 260 kHz.
The LM2678 can deliver up to 5 A of continuous output current.