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 “live” 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