Features and Benefits
- Wide Input Range: 5.5V to 60V
- 1.5A Peak Switch Current
- Constant 200kHz Switching Frequency
- Saturating Switch Design: 0.2Ω
- Peak Switch Current Rating Maintained Over Full Duty Cycle Range
- Low Effective Supply Current: 2.5mA
- Low Shutdown Current: 25μA
- 1.2V Feedback Reference Voltage (LT1766)
- 5V Fixed Output (LT1766-5)
- Easily Synchronizable
- Cycle-by-Cycle Current Limiting
- Small 16-Pin SSOP and Thermally Enhanced TSSOP Packages
The LT1766/LT1766-5 are 200kHz monolithic buck switching regulators that accept input voltages up to 60V. A high efficiency 1.5A, 0.2Ω switch is included on the die along with 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. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch. Patented circuitry maintains peak switch current over the full duty cycle range. A shutdown pin reduces supply current to 25μA and the device can be externally synchronized from 228kHz to 700kHz with logic-level inputs.
The LT1766/LT1766-5 are available in a 16-pin fused-lead SSOP package or a TSSOP package with exposed backside for improved thermal performance.
- High Voltage, Industrial and Automotive
- Portable Computers
- Battery-Powered Systems
- Battery Chargers
- Distributed Power Systems
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
Documentation & Resources
R365 Reliability Data3/23/2018
60V/3A Step-Down DC/DC Converter Maintains High Efficiency over a Wide Range of Input Voltages8/1/2002 LT Journal
LT1766: 1.5A Converter Runs Directly from 60V DC5/1/2001 LT Journal
Tools & Simulations
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LT1766 Companion Parts
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