Industry's First Six-Phase Controllers from ON Semiconductor Comply with Intel's Latest VR11.1 Requirements

PHOENIX—(BUSINESS WIRE)—October 15, 2008— ON Semiconductor (Nasdaq: ONNN), a global supplier of high performance, energy efficient, silicon solutions, has introduced the industrys first six-phase Pulse Width Modulation (PWM) controllers. The ADP4000 and ADP4100 satisfy the demanding performance requirements of Intels 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 possess 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 Fast Enhancement PWM (FEPWM) architecture 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 vice president and general manager of ON Semiconductors 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 is available in a Pb-free, RoHS-compliant LFCSP-48 package, and is priced at $3.75 U.S. per unit in 2,500 unit quantities. The ADP4100 is available in a Pb-free, RoHS-compliant LFCSP-48 package, and is priced at $3.45 U.S. per unit in 2,500 unit quantities.

For additional information visit http://, or contact David Chu at Email Contact.

About ON Semiconductor

With its global logistics network and strong product portfolio, ON Semiconductor (Nasdaq: ONNN) is a preferred supplier of high performance, energy efficient, silicon solutions to customers in the power supply, automotive, communication, computer, consumer, medical, industrial, mobile phone, and military/aerospace markets. The companys broad portfolio includes power, analog, DSP, mixed-signal, advance logic, clock management, non-volatile memory and standard component devices. Global corporate headquarters are located in Phoenix, Arizona. The company operates a network of manufacturing facilities, sales offices and design centers in key markets throughout North America, Europe, and the Asia Pacific regions. For more information, visit

ON Semiconductor and the ON Semiconductor logo are registered trademarks of Semiconductor Components Industries, LLC. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders. Although the company references its website in this news release, such information on the website is not to be incorporated herein.


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