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Intersil regulator IC reduces space, BoM cost

Posted: 18 Feb 2004 ?? ?Print Version ?Bookmark and Share

Keywords:endure? power regulator ic? intersil? isl6537? isl6506?

The two Endura power regulator ICs from Intersil Corp. are designed to provide reduced BoMs, manufacturing costs, board space and routing problems for the next-generation Intel-based computing platforms.

With the option of being used separately, the ISL6537 and ISL6506 regulate a total of six motherboard voltages: the DDR memory core, DDR termination, chipset core, 5V(dual), 3.3V(dual), as well as the CPU bus termination voltage, with full ACPI compliance. The ISL6506 works well to complement the ISL6537 providing the 5V(dual) voltage that the ISL6537 requires for down-conversion to the DDR core.

The ISL6537 integrates one PWM controller, one 3A low dropout (LDO) regulator, and two LDO controllers, along with all the power sequencing, system monitoring and protection functions required for DDR and chipset regulation on Intel-based motherboards. It reduces critical board area and overall BoM cost while maintaining ease of routing and thermal margin to meet higher power density requirements of next-generation Intel CPUs.

The ISL6537 also provides a ACPI-compliant power solution for up to four DIMM dual-channel DDR/DDR2 memory systems. The synchronous buck controller supplies VDDQ during the S0/S1 and S3 states. During the S0/S1 state, a fully integrated 3A sink-source regulator generates a high-current VTT voltage without the need for a negative supply. A buffered version of the VDDQ/2 reference is provided as VREF.

Two on-chip LDOs provide graphics memory controller hub (GMCH) core voltage regulation and GMCH/CPU VTT bus termination voltage regulation. The ISL6537 GMCH core LDO is a dual-stage LDO. The DDR core voltage is stepped down to an intermediate voltage, and the intermediate voltage is stepped down to the desired GMCH core voltage through a second power MOSFET. This provides the benefit of spreading the thermal dissipation on the motherboard, reducing the size of the MOSFETs and the PCB area.

Designed to serve standby system and peripheral power requirements, the ISL6506 is packaged in a thermally enhanced 8-lead exposed-pad SOIC, and provides 5V(dual) for USB, keyboard and mouse, and 3.3 (dual) and 3.3V(standby) for PCI, auxiliary and LAN circuits.

The Advanced Configuration and Power Interface (ACPI) specification is an industry standard that enables system power components to be software controlled in real time to improve power and OS efficiency.

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