FEATURES

Wide Input Supply Range: −20 V to −80 V

Transient Rating to −100 V

Insertion/Removal Detection Delay

Extended Debounce Delay

Programmable Current Limit

Programmable Current Slew Rate

Programmable UV/OV Thresholds/Hysteresis

Open-Drain Power Good (PG) Output

Fault Timer to Eliminate Nuisance Trips

Open-Drain Fault Output (FAULT)

14-Pin TSSOP package

APPLICATIONS

−48-V Distributed Power Systems

Central Office Switching

Wireless Base Station

DESCRIPTION

The TPS2393A integrated circuit is a hot swap

power manager optimized for use in nominal

−48-V systems. It operates with supply voltage

ranges from −20-V to −80-V, and is rated to

withstand spikes to −100 V. In conjunction with an

external N-channel FET and sense resistor, it can

be used to enable live insertion of plug-in cards

and modules in powered systems. It provides load

current slew rate control and peak magnitude

limiting. Undervoltage and overvoltage shutdown

thresholds are easily programmed via a

three-resistor divider network. In addition, two

active-low, debounced inputs provide plug-in

insertion and removal detection. The associated

debounce delay applies to both actions. A power

good (PG) output enables downstream

converters. The TPS2393A also provides the

basic hot swap functions of electrical isolation of

faulty cards, filtered protection against nuisance

overcurrent trips, and single-line fault reporting.

The TPS2393A periodically retries the load in the

event of a fault.