Intersil Corporation has expanded its family of VR11.1-compliant PWM controllers with new 4-phase and 6-phase PWM controllers that feature high light load efficiency and very fast transient performance.
The ISL6334 and ISL6334A are 4-phase PWM controllers and the ISL6336 and ISL6336A are 6-phase PWM controllers. Both sets regulate microprocessor core voltage by driving multiple channels (up to four for the ISL6334s and up to six for the ISL6336s) using a multiphase architecture that increases channel ripple frequency. The architecture also reduces input and output ripple currents. This enables the use of fewer total components, resulting in a smaller total footprint, lower cost, reduced power dissipation, and improved reliability.
Designed for server, desktop, workstation and gaming motherboards based upon Intel‘s VR11.1 CPUs, the controllers meet the tightly regulated output voltage position requirements of the latest microprocessors by using patented techniques to sense output current continuously. They measure the voltage across the DCR of the output inductor or a dedicated current sense resistor to provide the needed signals for precision droop, channel-current balancing and overcurrent protection. When using DCR current sensing, compensation of all thermal effects is accomplished through addition of a single low-cost NTC resistor network.
Intersil Corporation, www.intersil.com.
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The 4- and 6-phase PWM controllers regulate microprocessor core voltage by driving multiple channels.
