Santa Clara, Calif.—National Semiconductor says its LM3100, the first member of a new synchronous Simple Switcher family, is the industry’s first synchronous, monolithic, 1.5-amp buck regulator with an input voltage range of 4.5 to 36 volts.
"This synchronous buck regulator combines ease of use, online design tool support, a wide input voltage range and innovative constant on-time architecture," said Paul Greenland, director of strategic marketing for the Power Management group.
The LM3100 employs a constant on-time (COT) architecture with a proprietary flywheel current injection control (FCIC) for ultra-fast response (no external loop compensation) and circuit stability is not degraded by
low-ESR ceramic output capacitors.
Input voltage feed-forward rejects line transients and keeps the switching frequency nearly constant when operating from an unregulated supply. The LM3100 also features a 0.8-volt, ± 1.5 percent reference for next-generation digital cores, adjustable switching frequency to 1 MHz, and an asymmetrical power stage tuned for step-down conversion for FPGA, DSP, digital ASIC, networking, gaming, audio-video, medical and industrial applications. Soft-start circuitry controls in-rush current and prevents output voltage overshoot on power-up. Output over-voltage protection immediately disables the high-side MOSFET. Cycle-by-cycle valley current limiting protects against overload and short-circuit loads. Thermal shutdown circuitry is also included.
Click here for more information about the LM3100. Click here to create a design with the LM3100 and simulate it on National’s Webench online design tool. The LM3100, in a thermally enhanced eTSSOP-20 package, is priced at $2.50 each in 1,000-unit quantities.
National Semiconductor, 1-800-272-9959, www.national.com