1.5-A Buck Regulator Withstands 60-V Input

June 18, 2001
The LT1766 step-down 200-kHz switching regulator IC from Linear Technology features a peak switch current of 15 A. Able to withstand from 5.5 to 60 V of input, it achieves a high efficiency of up to 90% under a wide range of loads. Unlike...

The LT1766 step-down 200-kHz switching regulator IC from Linear Technology features a peak switch current of 15 A. Able to withstand from 5.5 to 60 V of input, it achieves a high efficiency of up to 90% under a wide range of loads.

Unlike other high-voltage switches that have a 1- to 2-V drop that causes low efficiency, the LT1766's low-resistance on-chip switch (300 mV at 1.5 A) delivers high efficiency even at low input voltages.

A patented slope-compensation circuit maintains 1.5 A of peak switch current over the entire duty cycle range. This makes the LT1766 ideal for telecommunication, industrial, and automotive applications that must operate across a wide range of input voltages. Its current-mode topology provides fast transient response and excellent loop stability.

The LT1766 can be synchronized up to 700 kHz with logic-level inputs. It features a low shutdown supply current of only 25 µA. Internal control circuitry is powered directly from the output, minimizing the power drawn from the input supply.

Also, the device incorporates all oscillator, control, and protection circuitry for a complete switching regulator. It's packaged in a small 16-lead SSOP, which is significantly smaller than competitive solutions. And, it's available in commercial and industrial temperature ranges.

Pricing starts at $3.65 each for the commercial-grade parts and $4.35 each for the industrial-grade parts, both in 1000-piece quantities.

Linear Technology Corp., 1630 McCarthy Blvd., Milpitas, CA 95035-7417; (408) 432-1900; fax (408) 434-6441; www.linear-tech.com.

About the Author

Roger Allan

Roger Allan is an electronics journalism veteran, and served as Electronic Design's Executive Editor for 15 of those years. He has covered just about every technology beat from semiconductors, components, packaging and power devices, to communications, test and measurement, automotive electronics, robotics, medical electronics, military electronics, robotics, and industrial electronics. His specialties include MEMS and nanoelectronics technologies. He is a contributor to the McGraw Hill Annual Encyclopedia of Science and Technology. He is also a Life Senior Member of the IEEE and holds a BSEE from New York University's School of Engineering and Science. Roger has worked for major electronics magazines besides Electronic Design, including the IEEE Spectrum, Electronics, EDN, Electronic Products, and the British New Scientist. He also has working experience in the electronics industry as a design engineer in filters, power supplies and control systems.

After his retirement from Electronic Design Magazine, He has been extensively contributing articles for Penton’s Electronic Design, Power Electronics Technology, Energy Efficiency and Technology (EE&T) and Microwaves RF Magazine, covering all of the aforementioned electronics segments as well as energy efficiency, harvesting and related technologies. He has also contributed articles to other electronics technology magazines worldwide.

He is a “jack of all trades and a master in leading-edge technologies” like MEMS, nanolectronics, autonomous vehicles, artificial intelligence, military electronics, biometrics, implantable medical devices, and energy harvesting and related technologies.

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