LM22679 is a 5A step-down voltage regulator with adjustable soft-start and current limit. It features a wide input voltage range, internally compensated voltage mode control, stable with low ESR ceramic capacitors, 100 mΩ N-channel MOSFET, adjustable soft-start function, and ±1.5% feedback.
The LM22679 series provides a monolithic step‑down (buck) regulator capable of delivering up to 5 A with high efficiency (>90%). It integrates voltage‑mode control, adjustable soft‑start, adjustable current limit, an internal boot diode, and thermal shutdown, all in a TO‑263 THIN package.
Typical applications include industrial control, telecom and datacom systems, embedded systems, and automotive telematics. The device can be designed with minimal external components using National’s WEBENCH® design tools.
| Input voltage range | 4.5 V to 42 V |
|---|---|
| Switching frequency | 500 kHz |
| Efficiency | >90 % |
| Operating temperature range | -40 °C to 125 °C |
| Package type | 7‑Lead Plastic TO‑263 THIN |
The regulator operates from 4.5 V to 42 V input.
The internal oscillator provides a fixed 500 kHz switching frequency.
By connecting a resistor between the IADJ pin and ground.
Efficiency is greater than 90 % under normal conditions.