MIC2591B_05 Datasheet, PDF (1/34 Pages) Micrel Semiconductor – Dual-Slot PCI Express Hot-Plug Controller

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) 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.
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.
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
Ordering Information
Part Number
Standard
Pb-Free
MIC2591B – 2BTQ MIC2591B – 2YTQ
MIC2591B – 3BTQ* MIC2591B – 3YTQ*
MIC2591B – 5BTQ* MIC2591B – 5YTQ*
* Contact factory for availability
12V and 3V
Fast-Trip Thresholds
100mV
150mV
Disabled
3.3VAUX
Current Limit
0.375A
0.375A
0.375A
Package
48 Pin TQFP
48 Pin TQFP
48 Pin TQFP
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
March 2005
1
M9999-033105