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Synchronous buck switching controller offered in SOT-23 package

Posted: 11 Oct 2005 ?? ?Print Version ?Bookmark and Share

Keywords:national semiconductor? buck switching controller? lm1770?

SOT-23 synchronous buck switching controller

The LM1770 from National Semiconductor Corp. is claimed to be the industry's first SOT-23 synchronous buck switching controller for low-voltage DC/DC conversion. This device provides low-voltage point-of-load regulation from standard 5V and 3.3V rails in space-constrained applications such as STBs, cable modems, digital video recorders and printers.

Packaged in the tiny SOT23-5, the LM1770 utilizes constant on-time control, making it easy to employ because it does not require external compensation. National added that its new solution replaces switching regulators and LDOs in enterprise server and point-of-sale applications where efficiency is crucial.

"With the LM1770, National continues to set the standard in power management with products that offer benchmark performance and are easy to use, accelerating the customer's time-to-market," said Paul Greenland, director of strategic marketing for the company's Power Management Group. "The LM1770 allows designers to solve point-of-load regulation issues with a small-footprint solution which reduces power consumption and eliminates compensation components."

The LM1770 features a fast transient response, which allows for fewer or smaller filter capacitors; an input voltage range of 2.8V to 5.5V; an output voltage as low as 0.8V; an internal soft-start; short circuit protection; and three on-time options that allow for selection of operating frequency range.

Already available, the LM1770 is priced at 95 cents in 1,000-unit quantities.

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