ISL6531CRZ

Special Purpose Regulators Overview

The ISL6531CRZ is a dual synchronous buck pulse-width modulation (PWM) controller manufactured by Renesas Electronics Corporation. Designed for DDRAM memory power applications, it regulates VDDQ and VTT termination voltages. The device operates within an input voltage range of 10.8V to 13.2V and provides two independent outputs. It utilizes a 32-pin QFN package with exposed pad for surface mount installation. The component supports continuous conduction mode operation and features internal compensation for input voltage and loading variations.

Special Purpose Regulators Feature Summary

• Dual output architecture specifically optimized for simultaneous VDDQ and VTT regulation in DDR memory systems
• Integrated internal compensation circuitry eliminates external components for stability across varying load and input conditions
• Synchronous buck topology enables high efficiency and precise voltage control for sensitive memory termination requirements

Special Purpose Regulators Applications

• DDR SDRAM VDDQ power supply regulation
• VTT termination voltage generation for DDR memory buses
• Intel platform motherboard power management designs

Special Purpose Regulators Procurement Notes

Verify the specific suffix CRZ indicates lead-free RoHS compliance and tape-and-reel packaging configuration. Confirm the manufacturer status as discontinued or end-of-life before finalizing design-in decisions. Ensure compatibility with existing Intel VRM specifications if replacing legacy components. Check for available evaluation boards such as the ISL6530CB for initial prototyping and validation purposes.

Special Purpose Regulators Selection Notes

Select this controller when designing power stages for DDR memory architectures requiring dedicated VDDQ and VTT rails. The integrated compensation simplifies layout compared to discrete solutions. Verify that the 32-QFN package fits the thermal and spatial constraints of the target motherboard. Consider the operating temperature range and input voltage window relative to the system's power delivery network capabilities.

Special Purpose Regulators Part Context

This component belongs to the Intersil/Renesas ISL65xx series of specialized voltage regulator controllers. These devices were widely used in early 2000s computer motherboards to manage complex memory power sequencing. The ISL6531 specifically addresses the dual-rail requirement common in DDR memory interfaces, distinguishing itself from single-output regulators in the same family.

Special Purpose Regulators Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. As the component is marked as discontinued, engineers must evaluate newer generations of memory power controllers or compatible multi-phase PWM controllers from current product lines.