MIC2589

The MIC2589 and MIC2595 are single-channel, negativevoltage 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. This family offers two responses to a circuit breaker fault condition:the MIC2589 and MIC2595 latch the circuit breaker's output off if the overcurrent threshold interval is exceeded while the MIC2589R and MIC2595R automatically attempt to restart at a fixed duty cycle after a current limit fault. A primary Power-Good signal and two secondary (delayed and staggered)Power-Good signals are provided to indicate that the output voltage of the inrush current limiter is within its valid operating range. These signals can be used to perform an allat-once or a sequenced enabling of one or more DC-DC power modules.

All support documentation can be found on Micrel's web site at www.micrel.com.