The LM2679 is a high efficiency 5A step-down switching regulator with adjustable current limit. It features a low ON-resistance DMOS power switch and achieves up to 92% conversion efficiency. The device uses a fixed frequency oscillator (260KHz) which allows for smaller physical components.
The LM2679 Simple Switcher® provides all active functions needed for a buck switching regulator capable of delivering up to 5 A. It features a low‑ON‑resistance DMOS power switch, a fixed 260 kHz oscillator, and resistor‑programmable peak current limit (3 A‑7 A). Efficiency can reach 92 % and the output voltage is guaranteed within ±2 % tolerance.
Designed for easy implementation, the device uses a minimal number of off‑the‑shelf external components. Application hints, design nomographs, and the free LM267X Made Simple software are provided to aid quick circuit design. The regulator is suitable for power‑up pre‑regulation, battery chargers, and other high‑efficiency step‑down applications.
| Input Voltage Range | 8 V to 40 V |
|---|---|
| Maximum Output Current | 5 A |
| Efficiency | up to 92 % |
| Switching Frequency | 260 kHz (fixed) |
| Peak Current Limit (adjustable) | 3 A to 7 A |
| Quiescent Current | 4.2 mA |
The LM2679 operates with an input voltage between 8 V and 40 V.
Typical efficiency can reach up to 92 %.
The device uses a fixed internal oscillator at 260 kHz.