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Two-phase core controller promises 0.5 percent accuracy

Posted: 12 Oct 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Intersil? ISL6264? AMD? Turion? R3?

Intersil's ISL6264 two-phase <a href=core controller" ALIGN="RIGHT">

Intersil Corp. has introduced a new two-phase core controller with embedded gate drivers to power AMD's next-generation (64bit Turion) mobile CPUs. This device, ISL6264, promises improved transient response and load line accuracy enabled by the company's patented R3 (Robust Ripple Regulator) Technology.

Intersil said its new R3 controller uses post-package trimming to remove all errors associated with assembly and offers 0.5 percent accuracy across the entire temperature range, said to be the best in the industry. The device uses two interleaved channels to double the output voltage ripple frequency, reducing output voltage ripple amplitude with fewer components, lower component cost, reduced power dissipation and smaller real estate area.

"The ISL6264 uses Intersil's patented R3 Technology to meet the transient response and light-load efficiencies required by AMD (Turion) processors," said Majid Kafi, director of Intersil's Notebook Power products group. "The dynamic phase adding/dropping optimizes the efficiency of the CPUs, improving battery life."

Compared with traditional multiphase controllers, Intersil said the ISL6264 has the fastest transient response due to the R3 modulator commanding variable switching frequency during a load transient. To boost battery life, the device supports PSI_L by automatically enabling different operation modes. At heavy load operation in the active mode, the controller commands the two-phase continuous conduction mode (CCM) operation. While the PSI_L is asserted during the deeper sleep mode or the light load of active mode, the device smoothly disables one phase and operates in a one-phase diode emulation mode (DE) to maximize the efficiency at light load.

A 6bit DAC allows dynamic adjustment of the core output voltage from 0.375V to 1.55V. A unity-gain differential amplifier is provided for remote CPU die sensing. This allows the voltage on the CPU die to be accurately measured and regulated per AMD mobile CPU specifications. Current sensing can be realized using either lossless inductor DCR sensing or precision resistor sensing. A single NTC thermistor network thermally compensates the gain and the time constant of the DCR variations.

The ISL6264 is available today in a 40-lead QFN package and is priced at $3.80 in 1,000-unity quantities. Evaluation boards are also available for the ISL6264.

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