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PWM control IC incorporates MOSFET drivers

Posted: 26 Oct 2004 ?? ?Print Version ?Bookmark and Share

Keywords:intersil? isl6566? a pwm control ic? mosfet driver? intel?

PWM control IC incorporates MOSFET drivers

Intersil Corp. developed a three-phase PWM control IC, with integrated MOSFET drivers, that provides a precision voltage regulation system that includes programmable VID codes compatible with Intel Pentium 4 VRM9 and VRM10/10.1 and AMD Opteron and Athlon microprocessors.

The integration of power MOSFET drivers into the controller IC marks a departure from the separate PWM controller and driver configuration of previous multiphase product families, Intersil said. By integrating a number of external parts, the new ISL6566 reduces BoM cost and PCB area, while providing compliance to the Intel and AMD CPU core specifications.

"The ISL6566 represents Intersil's continuing ability to provide the industry's highest performance-to-price ratio in advanced CPU power solutions," commented Cindy Drapcho, VP of Intersil's Power Management Computing Products.

A unique feature of the ISL6566 is the all-in-one VID inputs. The device can accept voltage identification (VID) digital inputs from both Intel and AMD CPUs. According to the company, this greatly simplifies the customers' logistics as the ISL6566 becomes a single-chip solution on Intel Celeron and P4 processors (5xx, 6xx and Extreme Edition), and AMD Athlon, Athlon64 and Opteron platforms.

The Dynamic-VID technology allows seamless on-the-fly voltage changes utilizing the VID bus, while the offset pin allows accurate voltage offset settings that are independent of VID bus setting.

The ISL6566 also combines use of both DCR and RDS(ON) current sensing. Load line voltage positioning (droop) and over-current protection are accomplished through continuous inductor DCR current sensing, while RDS(ON) current sensing is used for accurate channel-current balance. Using both methods of current sampling utilizes the best advantages of each technique.

A unity gain, differential amplifier is provided for remote voltage sensing, compensating for any potential difference between remote and local grounds. The output voltage can also be positively or negatively offset through the use of a single external resistor. The adjustable switching frequency of up to 1.5MHz/phase enables the system designer to optimize the conduction and switching losses in his/her design.

The ISL6566's 6-by-6mm QFN package enables good thermal performance as the bottom of the IC is a copper pad that can be directly connected to the PCB ground layer, facilitating easy transfer of heat from the switching regulator to the inner PCB copper layers.

Protection features of the controller chip include a set of sophisticated over-voltage, under-voltage, and over-current protection. Over-voltage results in the converter turning the lower MOSFETs ON to clamp the rising output voltage and protect the microprocessor, while the over-current protection level is set through a single external resistor. The ISL6566 also includes protection against an open circuit on the remote sensing inputs.

Housed in lead-free, 6-by-6mm QFN packaging, the ISL6566 has a suggested price of $1.75 each in 10,000 unit quantities. Additional information can be found online.

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