ACPI-compliant power for DDR and DDR2 memories

The Endura ISL6532CR and ISL6532ACR are power regulators for dual-channel DDR and DDR2 memory systems.

The Endura ISL6532CR and ISL6532ACR are power regulators for dual-channel DDR and DDR2 memory systems.

The ISL6532A is the industry's only triple-output DDR memory power IC, and both ICs are the industry's only multioutput DDR regulators that include a 3A (maximum) VTT linear low dropout (LDO) voltage regulator.

Both controllers offer high performance in an ultra-small 6 x 6mm QFN package.

These ACPI-compliant controllers join Intersil Endura power solutions that support VR10 and Intel i865 and i875 chipset computing platforms.

The ISL6532 regulates the DDR/DDR2 memory core voltage (VDDQ) and the DDR memory bus termination voltage (VTT).

In addition to the VDDQ and VTT regulation, the ISL6532A offers a third linear FET controller to power chipsets, graphics GPU cores or the accelerated graphics port (AGP).

Other applications for the third linear regulator in the ISL6532A include power for ASICs, CPU VID-generating circuitry, DSPs, FPGAs, embedded processors and I/O ports.

This additional on-chip LDO saves parts count, costs and board space in addition to a reduction in design time.

Included in the ISL6532/32A are a synchronous-buck PWM controller to supply VDDQ with high current during run states and an integrated LDO to supply standby current during the suspend-to-RAM state.

Continuous VDDQ regulation is ensured during transitions from active (S0) to stand-by (S3) ACPI states and vice-versa.

Such performance is essential for the proper operation of the DDR memory and the computer motherboard.

The ISL6532/32A accept the SLP-S3, SLP-S5 ACPI signals directly from the chipset, without the need for any glue logic.

During run mode, a fully integrated sink-source regulator generates an accurate (VDDQ/2) high current VTT voltage without the need for a negative supply.

A buffered version of the VDDQ/2 reference is provided as VREF.

Both the switching regulator and standby LDO provide a maximum static regulation tolerance of +/-2% over line, load, and temperature ranges.

Each output is monitored via the feedback pins for under- and overvoltage events.

The undervoltage lockout feature provides short-circuit protection on the VTT and VDDQ regulators by monitoring their outputs for hard shorts (undervoltage events).

Thermal shutdown protection is integrated on chip.

The ISL6532 and ISL6532A complement Intersil's CPU core multiphase regulators and ACPI power controllers to provide a complete VRM9/VRM10 computer motherboard power system solution.

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 ISL6505 ACPI-compliant controller provides CPU-guided system power management.

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