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PWM device provides 2 synchronous buck voltage outputs, 1 linear controller output

Posted: 11 Feb 2005 ?? ?Print Version ?Bookmark and Share

Keywords:intersil? isl6534?

PWM device provides 2 synchronous buck voltage outputs, 1 linear controller output

Intersil Corp. released a highly efficient, 3-in-1 PWM solution for providing two synchronous buck voltage outputs and a linear controller output. The new ISL6534 powers next generation Double Data Rate (DDR) memory supplies for servers, motherboards, I/Os, FPGAs and embedded processors, as well as graphic cards and other system electronics.

This triple regulator has two independent synchronous-rectified buck controllers with integrated 12V gate drivers and a linear controller, providing precision regulation of up to three voltage rails. Each output has an internal 0.8 percent accurate reference for regulating any voltage down to as low as 0.6V. An optional shunt regulator allows 12V-only operation, when a 5V supply is not available. When configured in DDR mode, the ISL6534 offers a low cost BoM solution for powering DDR memory by including Vddq to Vtt tracking and a VREF buffered output, as well as an additional linear output.

Each controller has independent soft-start and enable functions. The three soft-start enable pins can be controlled independently or they can be tied together to provide complete control of start-up coordination. The PGOOD function indicates when all regulators have completed their soft start and provides an indication of short circuit conditions on either switching regulator. In addition, the IC has an integrated phase lock loop device that allows for bi-directional frequency synchronization for synchronizing multiple ISL6534s or various other controllers.

Additional information on the ISL6534 can be found online.





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