This document is about LT1766/LT1766-5, LT1766/LT1766-5 are 200kHz monolithic buck switching regulators that accept input voltages up to 60V. It includes a high efficiency 1.5A, 0.2Ω switch, as well as all the necessary oscillator, control and logic circuitry. A current mode control architecture delivers fast transient response and excellent loop stability. Special design techniques and a new high voltage process achieve high efficiency over a wide input range. By using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch, efficiency is maintained over a wide output current range. Patented circuitry* maintains peak switch current rating.
The LT1766/LT1766-5 is a 200 kHz monolithic buck regulator that accepts a wide input range of 5.5 V to 60 V and delivers up to 1.5 A of peak switch current. It features a constant‑frequency current‑mode architecture, a shutdown pin that reduces supply current to 25 µA, and an optional synchronizable output.
The document includes absolute maximum ratings, detailed electrical characteristics, pin descriptions, block diagrams, and package dimensions for both the 16‑lead TSSOP and SSOP versions. It also lists ordering information, typical performance curves, and layout recommendations for optimal thermal performance.
| Input Voltage Range | 5.5 V to 60 V |
|---|---|
| Peak Switch Current | 1.5 A |
| Switching Frequency | 200 kHz |
| Shutdown Current | 25 µA |
| SENSE Pin Resistance (LT1766-5) | 13.8 kΩ (typical) |
The LT1766 operates from 5.5 V up to 60 V input.
When the shutdown pin is asserted, the supply current is reduced to about 25 µA.