UCC3917D

Overview

The UCC3917D is a positive floating hot-swap power manager from Texas Instruments, designed for controlled insertion and removal of live circuit boards. It integrates an internal N-channel MOSFET with precise current limiting and thermal protection to prevent bus voltage collapse during fault conditions. The device operates within a supply voltage range of 8.5 V to 10.5 V and supports continuous load currents up to 3 A. It features a PDIP-8 package for through-hole mounting and functions reliably across commercial temperatures from 0°C to +70°C.

Feature Summary

• Integrates an internal N-channel MOSFET for compact board-level hot-swap control
• Provides programmable current limiting and thermal shutdown to protect against short circuits and overloads
• Supports controlled ramp-up of output voltage to minimize inrush current and bus disturbances

Applications

• Controlled insertion and removal of daughter cards in backplane systems
• Power management for telecommunications and industrial equipment modules
• Protection of high-value circuit boards during maintenance or replacement

Procurement Notes

Verify the specific suffix 'D' indicates the SOIC-8 package variant, as datasheets may list PDIP-8 for the base UCC3917. Confirm RoHS compliance status and check for End-of-Life notices, as older TI components often face discontinuation. Ensure the design accounts for the floating gate drive requirements associated with positive hot-swap applications.

Selection Notes

Select this component when a single-chip solution for positive voltage hot-swap is required without external discrete MOSFETs. It is suitable for applications needing integrated current limiting and thermal protection. Compare against the UCC3915 series if lower voltage operation or different pin configurations are preferred. Verify that the internal MOSFET Rds(on) meets the efficiency requirements for the target load current.

Part Context

The UCC3917 belongs to the UCC39xx family of hot-swap controllers, which are specialized power management ICs. This family addresses the need for safe board exchange in systems where powering down is not feasible. The UCC3917 specifically targets positive voltage rails, distinguishing it from negative counterparts like the UCC2913.

Replacement Considerations

Public confirmed substitute part numbers: None identified.