UCC3921D

Overview

The UCC3921D is a latchable negative floating hot swap power manager from the UCC3921 family, designed for complete power management and fault handling in negative voltage systems. It operates within a supply voltage range of 8.5 V to 10.5 V with a single channel configuration. The device features adjustable current limiting and supports surface-mount installation in an SOIC-8 package. It functions reliably across an operating temperature range of -40°C to +85°C, consuming approximately 2 mA of quiescent current.

Feature Summary

• Provides complete power management and fault handling capabilities for negative floating hot swap applications
• Features precision fault thresholds with programmable average power limiting and linear current control
• Includes overcurrent limit and fault time protection mechanisms

Applications

• Negative voltage hot swap controller implementations
• System power management requiring latchable fault handling
• Fault protection circuits for floating negative rails

Procurement Notes

Verify the specific manufacturer designation when sourcing, as the component appears under both Unitrode and Texas Instruments branding due to corporate history. Confirm the exact suffix (e.g., D vs. DTRG4) determines packaging type such as tube or tape-and-reel. Ensure compatibility with negative voltage system architectures before procurement.

Selection Notes

Select this component for applications requiring precise control over negative voltage hot swap events. The adjustable current limiting allows customization for specific load requirements. Consider the latchable nature of the fault handling for systems requiring persistent fault indication until manual reset. Verify that the negative floating topology aligns with the target system design.

Part Context

The UCC3921D belongs to the UCC3921 family of negative floating hot swap power managers. Originally developed by Unitrode, these components are now associated with Texas Instruments following industry consolidation. The family provides integrated solutions for managing power insertion and removal in systems utilizing negative voltage rails, ensuring safe operation during hot swap events.

Replacement Considerations

Publicly confirmed substitute part numbers for the UCC3921D were not identified in the provided source material. Users should consult official manufacturer documentation for direct replacements or verify functional equivalence with other negative hot swap controllers if cross-referencing is required.