The MIC2580A incorporates a circuit breaker function that protects all four supplies (+12V, +5V, +3.3V, and –12V) upon an overcurrent fault condition. Current foldback limiting prevents large transient currents caused by plugging adapter cards into live backplanes, such as in a CompactPCI system. A programmable slew-rate control limits high inrush currents to all loads that occur when power is applied to large capacitive loads.

Voltage supervisory functions for all four power supplies are provided by “power good” (/PWRGD) and “overcurrent fault” (/FAULT) diagnostic outputs. Power good and overcurrent fault include deglitch filters to prevent nuisance tripping. Power good is active when all four supplies are within tolerance. Fault (/FAULT) goes active upon overcurrent or overtemperature conditions. The on-off control input (/ON) is used to cycle power to the adapter card.

• PCI hot-plug and CompactPCI™ hot-swap support
• +12V, +5V, +3.3V, and –12V power supply control
• Circuit breaker function to protect system
• Programmable slew rate control for all supplies
• Foldback current-limiting
• +5V and +3.3V programmable current-limit thresholds
• Undervoltage and overcurrent diagnostic outputs
• Deglitch filters on diagnostic fault outputs
• Integrated +12V and –12V MOSFET switches
• Integrated high-side drivers for 3.3V and 5V external switches
• Precharge supply for CompatPCI™ I/O termination

• PCI hot-plug systems
• CompactPCI™ hot-swap systems