TPS2390

TPS2390 TPS2391 SLUS471D − JUNE 2002 − REVISED JANUARY 2008 SIMPLE -48ĆV HOT SWAP CONTROLLER FEATURES D Wide Input Supply Range: −36 V to −80 V D Transient Rating to −100 V D Programmable Current Limit D Programmable Current Slew Rate D Enable Input (EN) D Fault Timer to Eliminate Nuisance Trips D Open-Drain Fault Output (FAULT) D Requires Few External Components D 8-Pin MSOP Package ⋅APPLICATIONS D −48-V Distributed Power Systems D Central Office Switching D 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. APPLICATION DIAGRAM −48V_RTN R3 10 kΩ 1W D2 R2 100 kΩ TPS2390/1 1 FAULT RTN 8 2 EN GATE 7 −48V_IN C1 0.1 µF 3 FLTTIME ISENSE 6 4 IRAMP −VIN 5 C2 3900 pF VOUT+ + DC/DC + C3 CONVERTER COUT 100 ...