The MIC2589 and MIC2595R-2YM 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/MIC2589R and the MIC2595/MIC2595R 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 via a programmable overcurrent threshold and filter. Very fast fault response is provided to ensure that system power supplies maintain regulation even during output short circuits. These controllers offer two responses to a circuit breaker fault condition: the MIC2589 and MIC2595R-2YM latch the circuit breaker's output off when the overcurrent threshold interval is exceeded and the overcurrent filter times out 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 is within its valid operating range. These signals can be used to perform an all-at-once or a sequenced enabling of one or more DC-DC power modules.
Feature
- 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/MIC2595)
- Output auto-retry (MIC2589R/MIC2595R)
- Active current regulation to control inrush currents
- Programmable undervoltage and overvoltage lockouts (MIC2589/MIC2589R)
- Programmable UVLO hysteresis (MIC2595/MIC2595R)
- Staggered 'Power-Good' output signals provide load sequencing
- Active-HIGH (-1)
- Active-LOW (-2)
