PM6680TR

Overview

The PM6680TR is a dual step-down controller designed for notebook PC chipset power systems. It operates with an input voltage range of 6V to 28V and provides two adjustable output channels, supporting voltages from 0.9V to 5.5V and 0.9V to 3.3V respectively. The device utilizes a constant on-time architecture for fast transient response and lossless current sensing via low-side MOSFETs. Key electrical parameters include a selectable minimum switching frequency of 33kHz in pulse skip mode, a maximum quiescent power of 4mW, and an internal reference voltage accuracy of ±1%. It features independent power good signals and soft-start capabilities.

Feature Summary

• Lossless current sensing technique using low-side MOSFETs RDS(on) for high efficiency conversion
• Constant on-time architecture ensuring fast load transient response
• Selectable pulse skipping at light loads to increase efficiency and avoid audio noise
• Embedded voltage feed-forward providing nearly constant switching frequency operation

Applications

• Notebook PC chipset power systems
• Dual output point-of-load converters
• Compact DC-DC multi-output power supplies

Procurement Notes

Verify the specific suffix TR indicates tape and reel packaging when ordering. Confirm the component status as active with STMicroelectronics before finalizing design-in. Ensure compatibility with the 32-VFQFPN package dimensions during PCB layout. Check for any updated environmental compliance documentation such as RoHS3 status prior to procurement.

Selection Notes

Select this controller for applications requiring high efficiency in notebook power architectures. The lossless current sensing reduces external component count compared to traditional sense resistor methods. Consider the 6V to 28V input range suitability for battery-powered systems. Evaluate the need for selectable switching frequencies to meet EMI requirements or avoid audible noise.

Part Context

The PM6680 is part of STMicroelectronics' PMIC portfolio focused on mobile computing power management. It serves as a core controller for generating multiple voltage rails required by modern processors and chipsets. The TR variant specifically denotes the reel packaging format suitable for automated surface mount assembly processes.

Replacement Considerations

PM6680ATR is a related variant within the same family offering similar functionality with potentially different operating temperature ranges or input specifications.