MICROCHIP MIC2587-1YM

The MIC2587 and MIC2587R are single-channel positive voltage hot swap controllers designed to provide safe insertion and removal of boards for systems that require live (always-powered) backplanes. These devices use few external components and act as controllers for external Nchannel power MOSFET devices to provide inrush current control and output voltage slew rate control. Overcurrent fault protection is provided via programmable analog foldback current-limit circuitry equipped with a programmable overcurrent filter. These protection circuits combine to limit the power dissipation of the external MOSFET to ensure that the MOSFET is in its SOA during fault conditions. The MIC2587 provides a circuit breaker function that latches the output MOSFET off if the load current exceeds the current limit threshold for the duration of the programmable timer. The MIC2587R provides a circuit breaker function that automatically attempts to restart power after a load current fault at a low duty cycle to prevent the MOSFET from overheating. Each device provides either an activeHIGH (−1YM) or an active-LOW (−2YM) “Power-is-Good” signal to indicate that the output load voltage is within tolerance of the application circuit’s design objective.

• MIC2587: Pin-for-pin functional equivalent to the LT1641
• Operates from +10V to +80V with 100V ABS MAX operation
• Programmable current limit with analog foldback
• Active current regulation minimizes inrush current
• Electronic circuit breaker for overcurrent fault protection:
  • Output latch off (MIC2587)
  • Output auto-retry (MIC2587R)
  • Fast responding circuit breaker (< 1 μs) for circuit loads
• Programmable input undervoltage lockout
• Open-drain “Power-is-Good” output for enabling DC/DC converter(s):
  • Active-HIGH: MIC2587-1/MIC2587R-1
  • Active-LOW: MIC2587-2/MIC2587R-2
• Fault Reporting

• General-purpose hot board insertion
• High-voltage, high-side electronic circuit breaker
• +12V/+24V/+48V distributed power systems
• +24V/+48V industrial/alarm systems
• Telecom systems
• Medical systems