MIC2341/2341R

Dual-Slot PCI Express Hot-Plug

Controller

PCI Express is a registered trademark of the PCI SIG

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

October 2007

M9999-102507-A

(408) 944-0800

General Description

The MIC2341 is a dual-slot power controller supporting the

power distribution requirements for Peripheral Component

Interconnect Express (PCI Express) Hot-Plug compliant

systems. The MIC2341 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.

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Features

•

Supports two independent PCI Express slots

•

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

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