PM6641TR

Overview

The PM6641TR is a monolithic voltage regulator module designed for chipset and DDR2/3 memory supply in ultra-mobile PC applications. It integrates three independent, adjustable, constant frequency buck converters, a ±2 Apk low dropout linear regulator, and a ±15 mA low noise buffered reference. The device features an input voltage range of 2.7 V to 5.5 V, providing outputs including VDDQ, VTT, and VTTREF with programmable soft-start, current limit, and active soft-end capabilities.

Feature Summary

• Integrates three independent adjustable buck converters for VDDQ and chipset power supplies
• Includes a high-current LDO for DDR2/3 termination voltage (VTT) with foldback protection
• Provides a dedicated low noise buffered reference for DDR2/3 operations
• Supports S0-S5 power states compliant with DDR2/3 specifications

Applications

• Ultra-Mobile PC (UMPC) chipset power supply
• DDR2/3 memory power supply
• Portable systems with space constraints

Procurement Notes

Verify the specific package marking and date code against the official STMicroelectronics datasheet to ensure authenticity. Confirm that the component matches the PM6641 monolithic VR specification for UMPC applications. Check for RoHS compliance documentation as required by your manufacturing standards. Ensure storage conditions respect humidity sensitivity levels indicated in the product data sheet.

Selection Notes

Select this component when designing power solutions for ultra-mobile PCs requiring integrated regulation for both chipset and DDR2/3 memory. It is suitable for space-constrained portable systems needing multiple regulated rails from a single IC. Consider its pulse-skipping efficiency at light loads and thermal protection features for reliable operation in compact enclosures.

Part Context

The PM6641 belongs to STMicroelectronics' portfolio of power management ICs tailored for mobile computing. It serves as a complete voltage regulator solution, replacing discrete components typically used for powering chipsets and DDR memory in notebooks and handheld devices. This integration helps reduce board space and simplify power design complexity.

Replacement Considerations

Check for pin-compatible alternatives within the same PMIC family or updated revisions from STMicroelectronics. Verify functional equivalence regarding output currents, voltage ranges, and control interfaces before substitution.