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Intersil's New Four-Output ACPI Linear Power Controller Delivers Highest Performance-to-Price Ratio on Intel i865/i875 Motherboards with Hyper-Threading Technology

-- Four regulators in one SOIC or QFN package reduce parts count, board space and costs~-- Device also replaces 5-lead SOT-23 Vcc-VID LDO in discrete solution

MILPITAS, CA, May 1, 2003 – Intersil Corporation (NASDAQ: ISIL), a world leader in the design and manufacture of high performance analog and wireless networking solutions, today announced the new ISL6505 four-output linear regulator with ACPI control interface. This industry-enabling IC contains four (4) linear Low Drop-Out (LDO) regulators, switching, monitoring, protection and control functions in a 20-lead wide-body Small Outline IC (SOIC) or space-saving, near-chip-scale, 20-pad 5 X 5 Quad Flat No-lead (QFN) package. The ISL6505 is designed to provide the industry’s highest performance-to-price ratio for powering systems on new Intel® i865 and i875 chipset-based motherboards with Hyper-Threading Technology.

The ISL6505 regulates a resistor-programmable +1.2 to 1.5 V for the LAN or Gigabit Ethernet (GbE) controller, +1.2 V for the VID generating circuitry residing on-board the CPU, +3.3 V(dual) for the PCI slots, LAN controller, and auxiliary components, and +5 V(dual) for the USB port, Keyboard, and Mouse. Two percent (2%) regulation is ensured on all outputs. The ISL6505 5 X 5 mm QFN package provides the industry’s best thermal dissipation and its near-chip-scale size requires the least board space.

Four discrete linear regulators are replaced by the ISL6505, along with their associated components. One significant advantage of the ISL6505 is that it eliminates the need for a separate 5-lead SOT-23- packaged LDO required for the VID generating circuit. The integrated VCC-VID LDO in the ISL6505 provides 180-mA current, 30 mA more than discrete VCC-VID LDOs available today.

The ISL6505 enables quick cut-and-paste designs from one motherboard model to the next, due to its simplicity. There’s no need for glue logic, as the chip is designed from the ground up to interface directly with the SLP_S3#, and SLP_S5# ACPI signals from Intel’s i865/i875 chipsets. The benefit of this design is that it offers the industry’s lowest-noise computer motherboard ACPI power management solution with seamless switching between active and standby states while maintaining continuous voltage regulation.

Typical discrete solutions utilize various on-board regulators for LAN/GbE, VCC-VID, PCI slots, Universal Serial Bus, keyboard, and mouse consisting of voltage references, resistors, capacitors, op amps, diodes, bipolar and MOS transistors. Noise coupled into these circuits can result in “illegal” ACPI state transitions and power upsets that lead to loss of critical data. Switching between supplies while they have not fully stabilized, or switching several loads into the same supply line causes momentary power overloads and brownouts, which leads to output regulation falling outside design limits. Glitches may trick the regulators to enter a fault state or latch off. The typical result of data loss is a system crash, followed by the need to reboot the system.

A typical discrete ACPI power management system takes up precious board area and lacks system monitoring and protection functions that could otherwise significantly reduce the total cost of ownership and prolong the life of an ACPI-compliant computer. The surface-mount placement cost associated with these discrete components also contributes to a higher implementation cost. Additionally, the reliability of the computer is potentially reduced, as compared to an integrated solution, as there are many more components on the board that could fail over time.

The ISL6505 provides the industry’s highest degree of integration, greatly reducing parts count, PCB area, and bill-of-materials cost, while reducing the time-to-market. A full set of monitoring and protection circuits ensures safe and reliable operation. Short-circuit protection is provided for all outputs. Other protections include thermal shutdown, under-voltage lockout and VID power good. A special LAN pin is provided to select LAN or Gigabit Ethernet where VOUT1 is always on for LAN mode and on only during active states for the Gigabit Ethernet mode.

The ISL6505 ACPI controller is part of a total system solution with Intersil’s CPU core multiphase regulators and DDR memory power controllers to provide a complete VRM10/i865/i875 computer motherboard power system solution enabling Intel’s Hyper-Threading Technology. Intersil’s new ISL6556A/B and ISL6561 two-to-four phase VRM10 PWM controllers, combined with the HIP660XB or ISL6605 MOSFET drivers, provide solid CPU core regulation. The new ISL6532A dual DDR memory controller regulates DDR memory core (VDDQ), DDR memory termination bus (VTT), and chipset core or Advanced Graphics Port (AGP) power. Intersil delivers the industry’s highest performance-to-price ratio across-the-board power solutions for the new Intel® i865 and i875 chipset computing platforms that is Intel’s Hyper-Threading Technology.

ISL6505 and ISL6505A Features Summary

• Industry’s highest integration, least parts count and lowest BOM cost
• Optimized for i865/i875 platforms
• Part of a total across-the-board power system solution which reduces parts and cost
• Four outputs from one IC
  • VOUT1 resistor programmable +1.2 to 1.5 V for LAN/Ethernet
  • VOUT2 +1.2 V for the VID generating circuit
  • VOUT3 +3.3 V(dual) with switched +3.3 V(standby) for PCI/Auxiliary/LAN
  • VOUT4 +5 V(dual) with switched +5 V(standby) for USB/Keyboard/Mouse
• 2% regulation across temperature for all outputs
• Under-voltage monitoring of all outputs
• Short-circuit protection on all outputs
• Thermal shutdown protection
• Dual-mode LAN pin to select regulation for Gigabit Ethernet or LAN 10/100 controllers
• 20-lead wide-body SOIC or near-chip-scale 20-pad 5 X 5 QFN package
• QFN package offers enhanced space and thermal efficiencies

ISL6505 and ISL6505A Availability and Pricing
The ISL6505CB and ISL6505CR are available now. Pricing, for thousand unit quantities, is $2.30 for the ISL6505CB and $2.38 for the ISL6505CR. Tape-reel is available. Evaluation platforms are available. For further information on this or other Endura products, visit Intersil’s Endura Power Management Web site at: http://www.intersil.com/design/powermanagement/index.asp About Intersil
Intersil Corporation is a global semiconductor leader in the design and manufacture of high performance analog and wireless networking solutions. Intersil’s product portfolios address four fast growing markets – flat panel displays, optical storage (CD and DVD recordable), power management and wireless networking. Intersil brings added customer value in providing complete silicon, software and reference design solutions to new products that enhance the computing experience for people wherever they live, work or travel. For more information about Intersil or to find out how to become a member of our winning team, visit the company's web site and career page at: www.intersil.com

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