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Intersil's new regulator offers faster transient response

Posted: 18 Mar 2005 ?? ?Print Version ?Bookmark and Share

Keywords:intersil? microprocessor core? microprocessor? intel? intel pentium m?

Intersil Corp. unveiled a new precision multiphase microprocessor core voltage regulator that can be programmed for one-, two- or three-channel operation to implement next-generation Intel Pentium M protocols. The ISL6260 supports the Pentium mobile processor voltage regulation specifications and PSI#, a feature recommended for Intel's next generation CPUs.

According to the press release, the ISL6260 offers world-class efficiency at full and light load, and seamless integration with the entire Intersil multiphase controller lineup. The company added that its new product delivers faster transient response than competitors' devices through the use of its Robust Ripple Regulator (R3) technology, which enables variable switching frequency during load transients. Cindy Drapcho, VP of Intersil's Power Management Computing Products, commented, "The ISL6260, matched with our ISL6208 gate driver, provides precise, optimum steady state and transient performance along with a new level of design flexibility for notebook power supply designers."

The ISL6260 uses interleaved channels to multiply the output voltage ripple frequency and reduce output channel currents. This reduction in ripple results in fewer external components and reduces the physical size and complexity of the CPU core power circuitry, said Intersil. In addition, the ISL6260 allows flexibility in choosing the number of phases required for the CPU design.

R3 technology

The R3 technology (patents pending) combines the best features of fixed-frequency PWM and hysteretic PWM, while eliminating many of their shortcomings, said Intersil. This regulation method internally synthesizes an analog signal of the inductor ripple currents and uses hysteretic comparators on those signals to determine PWM pulse widths. Operating on these large-amplitude, noise-free synthesized signals allows the PWM to achieve lower output ripple and lower phase jitter than conventional hysteretic and fixed-frequency PWM controllers, explained the company.

The ISL6260 is available in a standard lead finish or Pb-free, 40-lead 6-by-6mm QFN package, with a suggested price of $3.50 each in 1,000-unit orders.

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