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SLUS562A − JUNE 2003 − REVISED SEPTEMBER 2003
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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 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 single-
external capacitor.
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
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−48-V Distributed Power Systems
Redundant Negative Voltage Supplies
Central Office Switching
APPLICATION DIAGRAM
V
DD
−48V_RTN
VIN+
EN
VOUT+
VOUT+
R3
30 kΩ
0.5 W
10 µA
+
+
C
OUT
R2
C3
100 kΩ
100 µF
100 V
VIN−
VOUT−
VOUT−
TPS2398/TPS2399
DC/DC CONVERTER
1
RTN
8
PG
EN
Q1
IRF530
2
3
4
GATE 7
FLTTIME ISENS 6
IRAMP
C1
D2
0.047 µF
R1
0.02 Ω
1%
−48V_INB
5
−VIN
C2
3900 pF
D1
UDG−03069
−48V_INA
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, Texas Instruments Incorporated
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ꢡ ꢥ ꢢ ꢡꢚ ꢛꢯ ꢝꢜ ꢠ ꢨꢨ ꢦꢠ ꢞ ꢠ ꢟ ꢥ ꢡ ꢥ ꢞ ꢢ ꢪ
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