MIC2591B Dual-Slot PCI Express Hot-Plug Controller - Micrel - #1

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March 2005 1 M9999-033105 MIC2591B Dual-Slot PCI Express Hot-Plug Controller 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) Specifi cation v1.0. The MIC2591B provides complete power control support for two PCI Express slots, including the 3.3VAUX defi ned by the PCI Express standards. Support for 12V, 3.3V, and 3.3VAUX supplies is provided including programmable constant-current inrush limiting, voltage supervision, programmable current limit, and circuit breaker functions. These features provide comprehensive system protection and fault isolation. The MIC2591B also incorporates an SMBus interface via which complete status of each slot is provided. Data such as voltage and current from each supply of each slot can be obtained for IPMI sensor records in addition to the power status of each slot. All support documentation can be found on Micrel’s web site at www.micrel.com. Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com 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 Specifi cation 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 ÄÓ ADC - Compliant to the Intelligent Platform Management Interface (IPMI) Specifi cation 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 Ordering Information Part Number 12V and 3V 3.3VAUX Package Standard Pb-Free Fast-Trip Thresholds Current Limit MIC2591B – 2BTQ MIC2591B – 2YTQ 100mV 0.375A 48 Pin TQFP MIC2591B – 3BTQ* MIC2591B – 3YTQ* 150mV 0.375A 48 Pin TQFP MIC2591B – 5BTQ* MIC2591B – 5YTQ* Disabled 0.375A 48 Pin TQFP * Contact factory for availability