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Six-phase controllers enhance energy efficiency

Posted: 20 Oct 2008     Print Version  Bookmark and Share

Keywords:desktop computers  monitoring features  Fast Enhancement PWM  Pulse Width Modulation 

ADP4000, ADP4100

ON Semiconductor touts the industry's first 6-phase Pulse Width Modulation (PWM) controllers. The ADP4000 and ADP4100 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 utilise features of VR11.1, the new desktop/server spec from Intel for 2008 desktop and server platforms, to conserve power during light-loading 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 have various protection and monitoring features. Current limit protection is available with delayed latch-off function that allows 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 for 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 optimise compensation and control performance, saving design-time and decreasing time to market. 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.

"When implemented along with ON Semiconductor MOSFETs and MOSFET drivers, they deliver a complete power management sub-system for the latest microprocessors while also providing both power efficiency and board space benefits," said Bill Schromm, senior vice president and general manager of ON Semiconductor's Computing Products Group.

The ADP4000 is available in a Pb-free, RoHS-compliant LFCSP-48 package, and is priced at Rs.161.29 ($3.75 U.S.) per unit in 2,500 quantities. The ADP4100 is available in a Pb-free, RoHS-compliant LFCSP-48 package, and is priced at Rs.148.39 ($3.45 U.S.) per unit in 2,500 quantities.

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