FEATURES

Wide Input Supply Range: −36 V to −80 V

Transient Rating to −100 V

Programmable Current Limit

Programmable Current Slew Rate

Enable Input (EN)

Fault Timer to Eliminate Nuisance Trips

Open-Drain Fault Output (FAULT)

Requires Few External Components

8-Pin MSOP Package

APPLICATIONS

−48-V Distributed Power Systems

Central Office Switching

Wireless Base Station

DESCRIPTION

The TPS2390 and TPS2391 integrated circuits

are hot swap power managers optimized for use

in nominal −48-V systems. 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 single-external capacitor.

They also provide single-line fault reporting,

electrical isolation of faulty cards, and protection

against nuisance overcurrent trips. The TPS2390

latches off in response to current faults, while the

TPS2391 periodically retries the load in the event

of a fault.