The LTC1873 is a dual switching regulator controller optimized for high efficiency with low input voltages
The LTC1873 is a dual, 550 kHz synchronous 2‑phase step‑down regulator controller designed for high‑efficiency microprocessor power supplies. It features two independent PWM controllers, an on‑chip 5‑bit VID DAC, and low shutdown current, making it suitable for Intel desktop VID applications and other high‑performance loads.
The document provides absolute maximum ratings, electrical characteristics, pin descriptions, package dimensions, and a typical 25 A dual‑output application. It also includes performance graphs, VID programming tables, and a detailed pin‑function guide for designers.
| Switching Frequency | 550 kHz |
|---|---|
| Output Voltage Range (Channel 1) | 1.3 V to 3.5 V |
| Maximum Output Current per Channel | 25 A |
| Shutdown Current | < 100 nA |
| Package | 28‑Lead Plastic SSOP |
The LTC1873 operates at a dual 550 kHz switching frequency.
The shutdown current is less than 100 nA.
It contains two independent PWM controllers in one package.