MIC2592B
Dual-Slot PCI Express Hot-Plug Controller
General Description
The MIC2592B is a dual-slot power controller supporting the
power distribution requirements for Peripheral Component
Interconnect Express (PCI Express) Hot-Plug compliant
systems. The MIC2592B 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, pro-
grammable current limit, and circuit breaker functions. These
features provide comprehensive system protection and fault
isolation. The MIC2592B also incorporates an SMBus interface
via which complete status of each slot is provided.
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
3.3V
- Standby operation for Wake-on-LAN applications with
low backfeed on Main +12V and +3.3V rails.
• 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.
Ordering Information
MIC2592B – 2BTQ
Part Number
Standard
Pb-Free
MIC2592B – 2YTQ
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
MIC2592B – 3BTQ* MIC2592B – 3YTQ*
MIC2592B – 5BTQ* MIC2592B – 5YTQ*
* Contact factory for availability
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
March 2005
1
M9999-033105
MICREL [ MICREL SEMICONDUCTOR ]
