General Description

The MIC2588 and the MIC2594 are single-channel, negative-voltage hot swap controllers designed to address the need for safe insertion and removal of circuit boards into “l(fā)ive” high-voltage system backplanes, while using very few external components. The MIC2588 and the MIC2594 are each available in an 8-pin SOIC package and work in conjunction with an external N-Channel MOSFET for which the gate drive is controlled to provide inrush current limiting and output voltage slew-rate control. Overcurrent fault protection is also provided and includes a programmable overcurrent threshold. During an output overload condition, a constantcurrent regulation loop is engaged to ensure that the system power supply maintains regulation.

Features

? MIC2588:

Pin-for-pin functional equivalent to the

LT1640/LT1640A/LT4250

? Provides safe insertion and removal from live –48V (nominal) backplanes

? Operates from –19V to –80V

? Electronic circuit breaker function

? Built-in 400μs “nuisance-trip” delay (tFLT)

? Regulated maximum output current into faults

? Programmable inrush current limiting

? Fast response to short circuit conditions (< 1μs)

? Programmable undervoltage and overvoltage lockouts (MIC2588-xBM)

? Programmable UVLO hysteresis (MIC2594-xBM)

? Fault reporting:

Active-HIGH (-1BM) and Active-LOW (-2BM)

Power-Good output signal

Applications

? Central office switching

? –48V power distribution

? Distributed power systems

? Server Networks