PM6675STR

Overview

The PM6675STR is a Power Management Integrated Circuit (PMIC) from STMicroelectronics, designed for complete DDR2/3 memory power supply control. It integrates a high-efficiency step-down controller and an independent Low Drop-Out (LDO) linear regulator in a single package. The device supports an input voltage range of 4.5 V to 28 V. The switching section utilizes Constant On-Time (COT) architecture for fast transient response, while the LDO can source or sink up to 2 A. It features adjustable output voltages, selectable current limits, and low-noise modes suitable for audio-sensitive applications.

Feature Summary

• Integrates a high-efficiency step-down controller with Constant On-Time (COT) architecture and an independent LDO linear regulator.
• Supports wide input voltage range from 4.5 V to 28 V with adjustable output voltages.
• Features selectable low-consumption mode and low-noise mode for optimized efficiency and audio sensitivity.
• Includes dedicated power-good signals and active soft-end functionality for both regulators.

Applications

• DDR2/DDR3 memory power supply control
• Audio-sensitive applications requiring low-noise operation
• Systems requiring combined switching and linear regulation

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Check for RoHS compliance status and specific packaging details such as tape and reel specifications. Confirm lead times and availability as inventory levels fluctuate. Ensure proper handling procedures are followed due to surface mount packaging requirements.

Selection Notes

Select this component when a combined buck and LDO solution is required for memory power rails. Consider the COT architecture for faster transient response compared to traditional voltage-mode controllers. Evaluate the need for low-noise modes if the application involves sensitive analog circuits. Verify that the 24-pin VFQFPN package fits the PCB layout constraints.

Part Context

The PM6675 series belongs to STMicroelectronics' portfolio of specialized power management ICs for memory applications. These devices are designed to simplify power supply design by integrating multiple regulators into a single chip. The STR suffix typically indicates a specific tape and reel packaging variant for automated assembly processes.

Replacement Considerations

Check for direct pin-to-pin replacements within the same family, such as PM6675S or PM6675TR, ensuring functional equivalence. Verify compatibility with existing board layouts and thermal requirements before substitution.