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Intersil 4-phase controller touts benchmark performance

Posted: 21 May 2004 ?? ?Print Version ?Bookmark and Share

Keywords:intersil? endure? isl564? pwm controller?

Intersil says its Endura ISL6564, for embedded computing through point-of-load applications, is the most advanced four-phase synchronous-buck PWM controller available.

The company touts the 6-bit VID (voltage identification) device as delivering the industry's lowest output range (down to 0.525V), and tightest phase balance and voltage regulation. It contains the industry's only self-clocked VID (no external clock required) and an output-current indicator.

"The ISL6564 is the industry's highest performing and most flexible PWM controller for precision high-current dc-dc converter applications," said Cindy Drapcho, VP of Power Products. "It raises the bar on performance and cost savings for a wide range of high-current precision voltage conversion and regulation applications."

The controller, combined with the company's HIP660XB or ISL661X MOSFET drivers or ISL6571 integrated power stages, forms a complete high-performance high-current power solution that provides high power-efficiency and cost savings. With a switching frequency up to 1.5MHz per phase, an ISL6564-based voltage regulator requires fewer components and less PCB area than competing solutions.

The chip's Dynamic VID technology allows seamless on-the-fly VID changes that adjust the output voltage in mV increments. The ISL6564 detects the difference between the actual output voltage and the VID input, and controls its own transition to the new VID setting. This ensures smooth ramp-up to the new, programmed output voltage without false triggering of the overvoltage protection circuit. An offset pin allows accurate voltage offset settings that are independent of the VID setting. The ISL6564 features a high-bandwidth control loop to provide optimal response to load transients. A unity-gain differential amplifier is provided for remote voltage-sensing. Differences in potential between remote and local grounds are eliminated using the remote-sense amplifier, thus improving regulation and protection accuracy. Designers also have a choice of current-sensing techniques: using the voltage across the lower-MOSFET's on-resistance, RDS(on), or the dc resistance of the output inductor during conduction intervals.

A threshold-sensitive enable input is also available to accurately coordinate the start up of the ISL6564 with any other voltage rail. This feature eliminates additional supervisory circuits. The chip, normally operating from a 5V source, also includes a shunt regulator to allow 12V bias (12V-only operation) using only a small external limiting resistor.

The ISL6564CR, in a 40-pad 6-by-6 mm QFN package, is available now at a suggested resale price of $1.95 each in 100 to 1,000-unit quantities. ICs are available on tape and reel.

- eeProductCenter

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