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SLUS471D − JUNE 2002 − REVISED JANUARY 2008
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FEATURES
DESCRIPTION
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Wide Input Supply Range: −36 V to −80 V
Transient Rating to −100 V
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.
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
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−48-V Distributed Power Systems
Central Office Switching
Wireless Base Station
APPLICATION DIAGRAM
V
+
OUT
R3
10 kΩ
1 W
−48V_RTN
+
+
DC/DC
CONVERTER
MODULE
C
OUT
C3
100 µF
100 V
V
OUT
−
D2
TPS2390/1
1
2
3
8
7
6
5
FAULT
RTN
R2
100 kΩ
Q1
IRF530
DGK PACKAGE
(TOP VIEW)
EN
GATE
1
8
7
6
5
FAULT
EN
RTN
FLTTIME
IRAMP
ISENSE
−VIN
2
GATE
ISENS
−VIN
C1
0.1 µF
R1
0.02 Ω
1/4 W 1%
3
4
FLTTIME
IRAMP
4
C2
−48V_IN
3900 pF
UDG−02085
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
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Copyright 2002 − 2008, Texas Instruments Incorporated
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