Datasheet

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SLUS562A − JUNE 2003 − REVISED SEPTEMBER 2003
   
  
1
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FEATURES
D
Wide Input Supply Range: −36 V to −80 V
D Transient Rating to −100 V
D Improved Transient Response
D Enable Input (EN)
D Programmable Current Limit
D Programmable Current Slew Rate
D Fault Timer to Eliminate Nuisance Trips
D Open-Drain Power Good Output (PG)
D 8-Pin MSOP Package
APPLICATIONS
D
−48-V Distributed Power Systems
D Redundant Negative Voltage Supplies
D 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 single-
external capacitor.
APPLICATION DIAGRAM
UDG−03069
C
OUT
V
DD
R1
0.02
1%
C1
0.047 µF
R3
30 k
0.5 W
R2
100 k
1
2
8
5
RTN
EN
+
−VIN
GATE
ISENS
−48V_INA
TPS2398/TPS2399
3 FLTTIME
4 IRAMP
6
7
C2
3900 pF
VOUT+VIN+
VOUT−
DC/DC CONVERTER
VIN−
VOUT+
VOUT−
+
D1
D2
−48V_INB
−48V_RTN
Q1
IRF530
C3
100 µF
100 V
PG
10 µA
EN
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Copyright 2002, Texas Instruments Incorporated
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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