MIC2593
Dual-Slot PCI Hot Plug Controller
LITTLE FOOT is a registered trademark of Siliconix Incorporated.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
September 2008
M9999-092208
General Description
The MIC2593 is a power controller supporting power
distribution requirements for Peripheral Component
Interconnect hot plug systems compliant to PCI v2.3 and
PCI-X 1.0b. TheMIC2593 provides complete power control
support for two PCI slots, including the 3.3V
AUX
defined by
the PCI v2.3 specification. Support for +5V, +3.3V, +12V,
and –12V supplies is provided and includes programmable
current limit, voltage supervision, fault reporting, and circuit
breaker functions which provide fault isolation. The
MIC2593 also incorporates an SMBus interface that
provides complete status and control of power within each
slot.
Data sheets and support documentation can be found on
Micrel’s web site at: 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
AUX
, +12V, and –12V
– High-side +5V and +3.3V gate driver circuits for
external N-Channel MOSFETs
• Overcurrent protection with adjustable timeout
eliminates 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
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Ordering Information
Part Number
5V & 3V Fast-trip
Threshold
+12V & –12V Fast-trip
Threshold
Operating
Temp. Range
Package Lead Finish
MIC2593-2BTQ 100mV 1.5A/0.4A 0° to +70°C 48-Pin TQFP Standard
MIC2593-2YTQ 100mV 1.5A/0.4A 0° to +70°C 48-Pin TQFP Pb-Free
Note:
Contact factory for availability of the MIC2593-5YTQ option that disables the 100mV fast-trip threshold.
