Microchip Technology MIC2589-1BM

General Description

The MIC2589 and MIC2595 are single-channel, negative voltage hot swap controllers designed to address the need for safe insertion and removal of circuit boards into “live” system backplanes, while using few external components. The MIC2589/89R and the MIC2595/95R are each available in 14-pin SOIC packaging 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 for which the overcurrent threshold and the overcurrent duration are programmable. Very fast fault response is provided to ensure that system power supplies maintain regulation even during output short circuits.

Features

• Provides safe insertion and removal from live –48V (nominal) backplanes
• Operates from –19V to –80V
• Fast responding circuit breaker (<1µs) to short circuit conditions
• User-programmable overcurrent detector response time
• Electronic circuit breaker function:
Output latch OFF (MIC2589/95) or
Output auto-retry (MIC2589R/95R)
• Active current regulation precisely controls inrush currents
• Regulated maximum output currents into faults
• Programmable undervoltage and overvoltage lockouts (MIC2589/89R)
• Programmable UVLO hysteresis (MIC2595/95R)
• Staggered ‘Power-Good’ outputs provide load sequencing
• Fault reporting:
Active-HIGH (MIC25XX-1) and Active-LOW
(MIC25XX-2) Power-Good signal output

Applications

• Central office switching
• –48V power distribution
• Distributed power systems