April 2004

1

M9999-042204

MIC2593

Micrel

MIC2593

Dual-Slot PCI Hot Plug Controller

General Description

The MIC2593 is a power controller supporting power distribu-

tion requirements for Peripheral Component Interconnect hot

plug systems compliant to PCI v2.3 and PCI-X 1.0b. The

MIC2593 provides complete power control support for two

PCI slots, including the 3.3V

specification. Support for +5V, +3.3V, +12V, and –12V sup-

plies is provided and includes programmable current limit,

voltage supervision, fault reporting, and circuit breaker func-

tions which provide fault isolation. The MIC2593 also incor-

porates an SMBus interface that provides complete status

and control of power within each slot.

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

Features

• Supports two completely independent PCI slots:

- Compliant to PCI v2.3 and PCI-X 1.0b power control

requirements

- Provides all major power control functions for two

independent PCI-X 2.0 slots

• Five voltage supplies supported: +12V, -12V, +5V,

+3.3V, and +3.3V

AUX

- Integrated gate driver circuits, current sense,

and power MOSFETs for 3.3V

- High-side +5V and +3.3V gate driver circuits for

external N-Channel MOSFETs

• Overcurrent protection with adjustable timeout elimi-

nates false tripping of circuit breakers

• Dual-level, dual-speed overcurrent detection circuitry for

quick fault response without nuisance tripping

• Slot power control with “Power-is-Good” and Fault

status reporting

- Via software over an SMBus interface or

- Via dedicated hardware input/output lines: Hot Plug

Interface (HPI)

• Complete thermal isolation between circuitry for Slot A

and Slot B

• One General Purpose Input (GPI) pin per slot for

mechanical switch or plug-in card retention/removal

input

Applications

• PCI hot plug power distribution

Ideal Applications:

• Mid- and High-end Server Applications compliant to

PCI v2.3, PCI-X 1.0b, and PCI-X 2.0

Ordering Information

5V & 3V Fast-trip

+12V & –12V Fast-trip

Part Number

Threshold

Threshold

Operating Temp. Range

Package

MIC2593-2BTQ

100mV

1.5A/0.4A

0

°C to +70°C

48-Pin TQFP

MIC2593-5BTQ

Disabled*

1.5A/0.4A

0

°C to +70°C

48-Pin TQFP

*Contact factory for availability.

LITTLE FOOT is a registered trademark of Siliconix Incorporated

.