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Six-phase PWM controllers meet Intel VR11.1 requirements

Posted: 20 Oct 2008 ?? ?Print Version ?Bookmark and Share

Keywords:PWM controller? Intel VR11.1 spec? desktop computer?


ON Semiconductor has introduced the ADP4000 and ADP4100 six-phase pulse width modulation (PWM) controllers. The devices satisfy the demanding performance requirements of Intel's VR11.1 specification and enable energy efficient motherboard and graphics card designs for servers and high-end desktop computers.

The ADP4000 and ADP4100 utilize features of VR11.1, the new desktop/server spec from Intel for 2008 desktop and server platforms, to conserve power during light-loading in order to save energy and generate less heat than earlier industry solutions. Dynamic VID transitions adjust both the processor voltage and processor frequency to switch between power/performance states. IMON (Current Monitoring) is required by VR11.1 for power management features of the processor.

The ADP4000 and ADP4100 are also packed with various protection and monitoring features. Current limit protection is available with delayed latch-off function. This allows for inherent per-phase protection against faulty components. Power Good monitoring is also present. High pull-up indicates that the voltage is within normal limits.

The devices also include Fast Enhancement PWM (FEPWM) architecture, which is an improved version of EPWM, to achieve extremely fast turn-on during transients yet preserves the clocking system for stability. FEPWM also maintains interleaving between phases even during transients for input filter power dissipation reduction. PWM clocking is still used for steady-state operation.

The ADP4000 includes a PMBus programmable digital interface that allows designers to optimize compensation and control performance, saving design-time and decreasing time to market. PMBus, which is based on SMBus, is an open standard for communicating power information over a digital interface. It is intended to work with all types of converters. Several functions can be programmed over PMBus including output voltage (VID code), output voltage offset for over-clocking, and current limit thresholds. The ADP4000 supports 25 PMBus-defined commands and 38 manufacturer-specific commands.

"These industry leading, six-phase controllers enable VR11.1 compliant designs in significant sectors of the worldwide computing market," said Bill Schromm, senior VP and general manager of ON Semiconductor's computing products group. "When implemented along with ON Semiconductor MOSFETs and MOSFET drivers, they deliver a complete power management subsystem for the latest microprocessors while also providing both power efficiency and board space benefits."

The ADP4000 and ADP4100 are available in a Pb-free, RoHS-compliant LFCSP-48 package, and priced at $3.75 and $3.45 each, respectively, in 2,500-unit quantities.

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