The LTC1703 is a dual switching regulator controller optimized for high efficiency with low input voltages. It includes two complete, on-chip, independent switching regulator controllers. Each is designed to drive a pair of external N-channel MOSFET devices in a voltage mode feedback, synchronous buck configuration. It uses a constant- frequency, true PWM design switching at 550kHz, minimiz- ing external component size and cost and optimizing load transient performance.
The LTC1703 is a dual, step‑down (buck) voltage‑mode switching regulator controller designed for synchronous operation with two external N‑channel MOSFETs per channel. It operates from a low‑voltage supply (up to 7 V) and provides high‑efficiency, tightly regulated outputs suitable for microprocessor power supplies.
Key features include a 550 kHz switching frequency, on‑chip 5‑bit VID DAC for Intel Mobile VID compliance, independent channel control, burst‑mode operation for light loads, and a low shutdown current (< 100 µA). The device is offered in a 28‑lead plastic SSOP package and includes extensive pin‑out and electrical characteristic tables.
| Switching Frequency | 550 kHz |
|---|---|
| Maximum Output Current per Channel | 25 A |
| Package Type | 28‑Lead Plastic SSOP |
| Supply Voltage Range | -0.3 V to 7 V |
| Operating Temperature Range | -40 °C to 85 °C |
| Shutdown Current | < 100 µA |
| Internal Reference Voltage | 0.8 V ±1 % |
The LTC1703 operates at a fixed 550 kHz switching frequency.
It provides two independent output channels.
Each channel can deliver up to 25 A of output current.
The device is supplied in a 28‑lead plastic SSOP package.