General Description

The MIC2591B is a dual-slot power controller supporting the power distribution requirements for Peripheral Component Interconnect Express (PCI Express) Hot-Plug compliant systems incorporating the Intelligent Platform Management Interface (IPMI) Specification v1.0. The MIC2591B provides complete power control support for two PCI Express slots, including the 3.3VAUX defined by the PCI Express standards.

Features

• Supports two independent PCI Express slots

• SMBus interface for slot power control and status

• Voltage-tolerant I/O for compatibility with SMBus 2.0 systems

• 12V, 3.3V, and 3.3VAUX supplies supported per PCI Express Specification v1.0a

- Intergrated power MOSFETs for 3.3VAUX rails

- Standby operation for Wake-on-LAN applications with low backfeed on Main +12V and +3.3V rails.

• On-chip circuitry for data collection of each rail output voltage and output current for both slots

- Integral analog multiplexer and 8-bit ∆Σ ADC

- Compliant to the Intelligent Platform Management Interface (IPMI) Specification v1.0

- Conversion results available via an SMBus interface

• Programmable inrush current limiting

• Active current regulation controls inrush current

• Electronic circuit breaker for each supply to each slot

• High accuracies for both circuit breaker trip points and nuisance trip prevention timers

• Dual level fault detection for quick fault response without nuisance tripping

• Thermal isolation between circuitry for Slot A and Slot B

• Two General Purpose Input pins suitable for interface to logic and switches.

Applications

• PCI Express v1.0a hot-plug power control