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PWM controllers cut bulk output capacitance

Posted: 12 May 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Vince Biancomano? Intersil? IS6326? IS6326B? IS6327?

Intersil Corp.'s IS6326, 6326B and 6327 PWM controllers, suited to driving 4 to 6 synchronous-rectified buck channels for VR11 CPU applications, deliver cost and real-estate savings with a design that cuts the amount of output bulk capacitance. Utilizing the company's active pulse positioning (APP) and adaptive phase alignment (APA) modulation schemes, the chips achieve what the company says is the industry's fastest transient response time with the fewest output capacitors.

APP and APA are designed to effectively speed up transient response at the load and thus reduce capacitance requirements. Other features include an internal unity-gain, differential amplifier to facilitate remote voltage sensing and eliminate any potential difference between remote and local grounds. The chips also include adjustable switching frequency up to 1MHz per phase; 8bit VID input with selectable VR11 code and extended VR10 code at 6.25mV per bit; 10.5 percent system accuracy over life, load, line and temperature; thermal monitoring, and integrated programmable temperature compensation.

The ISL6326 and ISL6326B (2-, 3- or 4-phase operation) are available now in 40-lead QFN packaging and are priced at $3.81, and $4.03, respectively. The ISL6327 (2-, 3-, 4-, 5- and 6-phase operation) is available in a 48-lead QFN package and is priced at $4.58. All pricing is for 1,000-unit orders.

- Vince Biancomano

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