PM6680A

Overview

The PM6680A is a dual synchronous step-down controller designed for high-efficiency DC-DC conversion. It features an input voltage range of 6V to 36V and provides two adjustable output channels, OUT1 (0.9V to 5V) and OUT2 (0.9V to 3.3V). The device utilizes a constant on-time architecture with lossless current sensing for fast transient response. It includes an embedded 5V LDO delivering 100mA peak current, selectable switching frequencies, and pulse skipping modes to minimize quiescent power consumption.

Feature Summary

• Dual synchronous buck control with lossless current sensing using low-side MOSFETs
• Constant on-time architecture ensuring fast load transient response
• Embedded 5V linear regulator providing 100mA peak auxiliary current
• Selectable minimum switching frequency in pulse skip mode to prevent audio noise

Applications

• Compact dual output point-of-load converters
• Embedded computer systems requiring multiple voltage rails
• High efficiency DC-DC conversion modules

Procurement Notes

Verify the specific suffix against the manufacturer's latest datasheet to confirm pinout compatibility and electrical specifications. Ensure the selected package variant matches the thermal requirements of the target application. Cross-reference the ordering information with official STMicroelectronics documentation to avoid discrepancies between distributor listings and actual component capabilities.

Selection Notes

Select this controller when designing multi-rail power systems requiring independent adjustment of two output voltages from a wide input range. The integrated LDO simplifies designs needing a stable auxiliary supply. Consider the constant on-time topology for applications demanding rapid response to load changes without external compensation complexity.

Part Context

The PM6680A belongs to the PM6680 family of power management ICs from STMicroelectronics. It is positioned as a specialized solution for notebook and embedded PC power architectures. The component integrates advanced control loops to optimize efficiency across varying load conditions while maintaining compact board space requirements through its integrated features.

Replacement Considerations

PM6680TR serves as a related variant within the same product family, offering similar dual-output control functionality with potentially different input voltage ranges or packaging options. Verify functional equivalence before substitution.