UCC2921D

Overview

The UCC2921D is a single-channel hot-swap voltage controller manufactured by Texas Instruments, designed for safe insertion and removal of circuit boards under load. It operates within a supply voltage range of 8.5 V to 10.5 V and features an adjustable current limit. The device supports surface-mount installation in an SOIC-8 package and functions reliably across an industrial temperature range from -40°C to +85°C, with a typical operating supply current of 2 mA.

Feature Summary

• Provides controlled power-up sequencing to prevent bus voltage collapse during board insertion
• Features adjustable current limiting to protect against overcurrent conditions
• Includes latchback negative floating functionality for robust fault handling

Applications

• Telecommunications equipment requiring -48V or similar bus protection
• Industrial control systems with hot-swappable backplanes
• Data center infrastructure supporting live board replacement

Procurement Notes

Verify the specific suffix designation matches the required tape-and-reel or tube packaging configuration. Confirm RoHS compliance status and moisture sensitivity level requirements prior to procurement. Ensure the ordering information aligns with the exact functional variant intended for the design.

Selection Notes

Select this component when designing systems that require precise control over inrush current and thermal management during hot-swap events. Consider the SOIC-8 package constraints and the need for external N-channel MOSFETs to handle the primary power path. Evaluate the adjustable current limit settings against the maximum allowable bus current for the specific application.

Part Context

This part belongs to the UCC2921 series of hot-swap controllers, which are specialized power management integrated circuits. These devices are engineered to manage the transient currents associated with plugging in printed circuit boards into live backplanes, ensuring system stability and component safety.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing design-in alternatives through detailed electrical parameter comparison before considering any substitution.