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PWM controller boosts efficiency, saves space

Posted: 06 Feb 2007 ?? ?Print Version ?Bookmark and Share

Keywords:PWM controller? MOSFET? DDR memory? Intersil? controllers?

ISL6535 PWM controller from Intersil

Intersil Corp. has introduced the ISL6535 high-performance pulse width modulation (PWM) controller that integrates the control, gate drivers, output adjustment, monitoring and protection functions into a near-chipscale-sized 4-by-4mm 16-lead QFN package.

The device has 12V, high-speed, 3A MOSFET gate drivers for efficient gate drive capability with less expensive MOSFETs. Also, the converter can source and sink current, which is suitable for DDR memory applications.

"The ISL6535 error amplifier features 15MHz gain bandwidth and a 6V/?s slew rate that enables high converter bandwidth for fast transient performance," said Philip Chesley, marketing manager of Intersil's desktop power products group. "The overcurrent protection monitors the current by using the Rds(on) of the upper MOSFET, eliminating the need for a current sensing resistor and reducing the overall BOM cost."

The ISL6535 provides a simple, single feedback loop and voltage mode control architecture. It includes programmable switching frequency that is adjustable from below 50kHz to over 1.5MHz.

The output voltage of the converter can be precisely regulated to as low as 0.597V, with a maximum tolerance of 1 percent over the commercial temperature range, and &pusmn;1.5 percent over the industrial temperature range. Full (0 to 100 percent) PWM duty cycle support and pre-biased soft-start features are also provided.

The ISL6535 is available in a 16-lead QFN package with prices starting at $1.52 each, and in a 14-lead SOIC package with prices starting at $1.39 each. Pricing is in 1,000-unit quantities.

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