MIC2342 Datasheet, PDF (1/32 Pages) Micrel Semiconductor – Dual-Slot PCI Express® Hot-Plug Controller

MIC2342/2342R
Dual-Slot PCI Express^® Hot-Plug
Controller
General Description
The MIC2342 is a dual-slot power controller supporting the
power distribution requirements for Peripheral Component
Interconnect Express (PCI Express^®) Hot-Plug compliant
systems. The MIC2342 provides complete power control
support for two PCI Express slots, including the 3.3VAUX
defined by the PCI Express standards. Support for the
12V, 3.3V, and 3.3VAUX supplies includes programmable
gate voltage slew-rate control, voltage supervision,
programmable current limit, and circuit breaker functions.
These features provide comprehensive system protection
and fault isolation. Additionally, in the event of an
overcurrent fault on 3.3VAUX that “trips” the circuit breaker
to cause the 3.3VAUX output to shut down, the MAIN
outputs (3.3V and 12V) for the affected 3.3VAUX slot, A or
B, will also be shut down. The MIC2341 controller
provides truly independent output operation for MAIN and
AUX.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• Supports two independent PCI Express slots
• MAIN & AUX outputs are inter-dependent during AUX
overcurrent conditions
• 12V, 3.3V, and 3.3VAUX supplies supported per PCI
Express Specification v1.0a, v.2.0
• Integrated Power MOSFETS for 3.3VAUX rails
• Standby Operation for Wake-on-LAN applications with
low backfeed on Main +12V and +3.3V rails
• Electronic circuit breakers for each supply per slot
- Programmable gate voltage slew-rate control
- Active current regulation controls inrush current
• High accuracy Primary and Secondary Circuit Breaker
Current-limit Thresholds
• Dual-level, dual-speed fault detection for fast response
without nuisance tripping
• User-programmable Primary Overcurrent Detector
• /PWRGD and Delayed /PWRGD (164 ms) Signal
Outputs per slot
• Separate /FAULT output signals for MAIN and AUX
rails for each slot
• Global Systems Power-is-Good Output
• Both slots thermally isolated
• Internally Debounced Plug-in Card Retention Switch
Inputs per slot.
Applications
• PCI Express v1.0a, v2.0 hot-plug power control
June 2008
1
M9999-062008-A