FEATURES
Wide Input Supply Range: −36 V to −80 V
Transient Rating to −100 V
Improved Transient Response
Enable Input (EN)
Programmable Current Limit
Programmable Current Slew Rate
Fault Timer to Eliminate Nuisance Trips
Open-Drain Power Good Output (PG)
8-Pin MSOP Package

APPLICATIONS
−48-V Distributed Power Systems
Redundant Negative Voltage Supplies
Central Office Switching

DESCRIPTION
The TPS2398 and TPS2399 integrated circuits
are hot swap power managers optimized for use
in nominal −48-V systems. For redundant-supply
systems, they incorporate an improved circuit
breaker response that provides rapid protection
from short circuits, while still enabling plug-ins to
tolerate large transients that can be generated by
the sudden switchover to a higher voltage supply.
They are designed for supply voltage ranges up to
−80 V, and are rated to withstand spikes to −100 V.
In conjunction with an external N-channel FET
and sense resistor, they can be used to enable live
insertion of plug-in cards and modules in powered
systems. Both devices provide load current slew
rate and peak magnitude limiting, easily
programmed by sense resistor value and a singleexternal
capacitor.