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MIC2580A_05 Datasheet, PDF (1/21 Pages) Micrel Semiconductor – Hot-Swap PCI Power Controller | |||
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MIC2580A
Micrel, Inc.
MIC2580A
Hot-Swap PCI Power Controller
General Description
The MIC2580A is a hot-swap controller that provides for safe
and orderly insertion and removal of PCI based adapter cards
from a PCI hot-plug compliant system backplane or
CompactPCI⢠system.
The MIC2580A incorporates a circuit breaker function that
protects all four supplies (+12V, +5V, +3.3V, and â12V) upon
an overcurrent fault condition. Current foldback limiting pre-
vents large transient currents caused by plugging adapter
cards into live backplanes, such as in a CompactPCI system.
A programmable slew-rate control limits high inrush currents
to all loads that occur when power is applied to large capaci-
tive loads.
Voltage supervisory functions for all four power supplies are
provided by âpower goodâ (/PWRGD) and âovercurrent faultâ
(/FAULT) diagnostic outputs. Power good and overcurrent
fault include deglitch filters to prevent nuisance tripping.
Power good is active when all four supplies are within
tolerance. Fault (/FAULT) goes active upon overcurrent or
overtemperature conditions. The on-off control input (/ON) is
used to cycle power to the adapter card.
Features
⢠PCI hot-plug and CompactPCI⢠hot-swap support
⢠+12V, +5V, +3.3V, and â12V power supply control
⢠Circuit breaker function to protect system
⢠Programmable slew rate control for all supplies
⢠Foldback current-limiting
⢠+5V and +3.3V programmable current-limit thresholds
⢠Undervoltage and overcurrent diagnostic outputs
⢠Deglitch filters on diagnostic fault outputs
⢠Integrated +12V and â12V MOSFET switches
⢠Integrated high-side drivers for 3.3V and 5V external
switches
⢠Precharge supply for CompatPCI⢠I/O termination
Applications
⢠PCI hot-plug systems
⢠CompactPCI⢠hot-swap systems
Typical Application
1µF
10m⦠IRF7413
10m⦠IRF7413
+12V/1A
+5V/8A
+3.3V/8A
GND
â12V/1A
VIO
/PCI_RST
/BD_SEL
/HEALTHY
/ENUM
+12V
+5V
+3.3V
GND
â12V
MIC2580A
12VIN
5VIN
1µF
12VOUT
5VSENSE
5VGATE
5VOUT
3VSENSE
3VGATE
VIO
3VIN
3VOUT
1µF
VPCHG
/PCIRST
/ON
1.2k
/POR
VIO
/PCIRST
CRST
/ON
/LPCIRST
CSLEW
/FAULT
/PGD
/EPWRGD CSTART
/PWRGD
GND
M12VIN M12VOUT
1µF
+12V
+5V
VPCH = +1V ±20%
(PRECHARGE SUPPLY)
+3.3V
Overcurrent
Fault
â12V
/LPCIRST
D0
D1
PCI
Controller
D0
D1
D2
D2
Dn
Dn
CompactPCI⢠Adapter with Early Power
CompactPCI is a trademark of the PCI Industrial Computer Manufacturerâs Group.
Micrel, Inc. ⢠2180 Fortune Drive ⢠San Jose, CA 95131 ⢠USA ⢠tel + 1 (408) 944-0800 ⢠fax + 1 (408) 474-1000 ⢠http://www.micrel.com
February 2005
1
MIC2580A
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