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MIC2580
Micrel
MIC2580
Hot-Swap PCI Power Controller
Preliminary Information
General Description
The MIC2580 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 MIC2580 incorporates a circuit breaker function that
protects all four supplies (+12V, +5V, +3.3V, and –12V) 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 “power good” (/PWRGD) and “overcurrent fault”
(/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 –12V 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 –12V 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
10mΩ
1µF
Platform
Adapter
IRF7413
10mΩ
IRF7413
MIC2580
+12V
+5V
+3.3V
GND
–12V
1µF
5VIN
12VIN
12VOUT
5VSENSE
5VGATE
5VOUT
3VSENSE
3VGATE
3VIN
1µF
1.2k
/PCIRST
/ON
CSLEW
3VOUT
VPCHG
/POR
CRST
/LPCIRST
Overcurrent
Fault
V
IO
V
PCH
= +1V
±20%
(PRECHARGE SUPPLY)
+12V/1A
+5V/8A
+3.3V/8A
GND
–12V/1A
+12V
+5V
VIO
V
IO
+3.3V
/PCI_RST
/BD_SEL
/PCIRST
/ON
/HEALTHY
/PGD
/FAULT
/EPWRGD CSTART
GND
/PWRGD
M12VIN M12VOUT
1µF
–12V
/LPCIRST
/ENUM
D0
D0
PCI
D1 Controller D1
D2
D2
Dn
Dn
Data Bus
CompactPCI™ Adapter with Early Power
Compact PCI is a trademark of the PCI Industrial Computer Manufacturer’s Group.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
November 2001
1
Data Bus
MIC2580
MIC2580
Micrel
Ordering Information
Part Number
MIC2580-1.0BTS
MIC2580-1.6BTS
Precharge Voltage
1V
1.6V
Temperature Range
–40°C to +85°C
–40°C to +85°C
Package
24-lead TSSOP
24-lead TSSOP
Pin Configuration
12VOUT 1
3VGATE 2
3VOUT 3
3VSENSE 4
3VIN 5
/PCIRST 6
/LPCIRST 7
/EPWRGD 8
/PWRGD 9
VPCHG 10
GND 11
M12VIN 12
24 12VIN
23 5VGATE
22 5VOUT
21 5VSENSE
20 5VIN
19 /FAULT
18 CSTART
17 CSLEW
16 /POR
15 CRST
14 /ON
13 M12VOUT
24-lead TSSOP (TS)
Pin Description
Pin Number
1
2
Pin Name
12VOUT
3VGATE
Pin Function
+12V Switched Supply (Output): Load carrying output.
3.3V Gate Drive (Output): Drives gate of external N-channel MOSFET +3V
switch. Adding capacitance will slow the slew rate of the external MOSFET
switch turn-on. (The external MOSFET’s gate is charged by an internal
current source.)
+3.3V Output Voltage Sense (Input): Connect to source of external
N-channel MOSFET (+3V switched output) to monitor for output undervolt-
age conditions.
+3.3V Current Sense (Input): Measures voltage drop across an external
sense resistor with respect to 3VIN for overcurrent detection through the
+3.3V switch.
3V Supply (Input): +3.3V-supply input for current monitoring (reference input
for 3VSENSE). Not a load-current carrying input.
PCI-Bus Reset (Input): Input from PCI bus that resets the internal logic.
3
3VOUT
4
3VSENSE
5
6
3VIN
/PCIRST
MIC2580
2
November 2001
MIC2580
Pin Number
7
8
Pin Name
/LPCIRST
/EPWRGD
Pin Function
Micrel
Local PCI Reset (Open-Drain Output): Local PCI reset output to PCI
controller. Compliant to CompactPCI specification for LOCAL_PCI_RESET.
Early Power Good (Open-Drain Output): This signal goes active should
/FAULT or /PWRGD go active. No deglitch filtering is provided. This signal
satisfies PCI /RST timing for T
FAIL
per PCI Local Bus Specification, ver-
sion 2.1.
Power Good (Open-Drain Output): Active-low output goes active when all
supplies are within tolerance. (A 20µs delay is inserted prior to activation to
reduce nuisance tripping.)
Precharge Supply (Output): (MIC2580-1.0) +1V
±20%
supply used for
precharge bias for I/O terminations (CompactPCI only).
Ground
–12V Supply (Input): Input for internal –12V switch.
–12V Switched Supply (Output): Switched –12V supply to PCI Hot Plug
compliant socket. Load carrying output.
On-Off Control (Input): Logic low turns on all switches; logic high turns off all
switches. Also used to reset the device from a circuit breaker condition.
Reset Delay (External Component): Connect to external capactior (C
RST
) to
increase power-on reset delay.
Reset (Open-Drain Output): Active-low signal remains active for a time
determined by C
RST
after all supplies are within tolerance; i.e., /PWRGD is
active. This signal may be used as a reset for logic controllers.
Slew (External Component): Connect to external capacitor (C
SLEW
) to
program the output slew rate of 3VGATE, 5VGATE, 12VGATE (internal) and
M12VGATE (internal).
Start-Up Timer (External Component): Connect to external capacitor
(C
START
) to increase the filter delay used to gate the /FAULT output upon
start-up. Used to prevent nuisance tripping during turn-on of supplies.
Fault (Open-Drain Output/Input): This active-low output signal activated
upon overcurrent or thermal shutdown. Includes 20µs deglitch filter. Fault is
reset using /ON.
Forcing pin low turns off all switches but does not activate the circuit breaker
function.
5V Supply (Input): +5V-supply input for current monitoring (reference
voltage for 5VSENSE). Not a load-current carrying input.
+5V Current Sense (Input): Measures voltage drop across an external
sense resistor with respect to 5VIN for overcurrent detection through the +5V
switch.
+5V Output Voltage Sense (Input): Connect to source of external N-channel
MOSFET (+5V switched output) to monitor for output undervoltage condi-
tions.
5V Gate Drive (Output): Drives gate of external N-channel MOSFET +5V
switch. Adding capacitance will slow the slew rate of the external MOSFET
switch turn-on. (The external MOSFET’s gate is charged by an internal
current source.)
12V Supply (Input): MIC2580 power supply and input for internal +12
switch. Supplies power for internal circuitry.
9
/PWRGD
10
11
12
13
14
15
16
VPCHG
GND
M12VIN
M12VOUT
/ON
CRST
/POR
17
CSLEW
18
CSTART
19
/FAULT
20
21
5VIN
5VSENSE
22
5VOUT
23
5VGATE
24
12VIN
November 2001
3
MIC2580
MIC2580
Micrel
Absolute Maximum Ratings
(Note 1)
Supply Voltages
+12V Input (V
12VIN
) ................................................. +14V
+5V Input (V
5VIN
) ....................................................... +7V
+3.3V Input (V
3VIN
) .................................................... +7V
–12V Input (V
M12VIN
) ............................................... –14V
/PWRGD, /FAULT, /POR, /EPWRGD, and /PCIRST
Output Current ........................................................... 10mA
Lead Temperature (soldering, 5sec.) ........................ 260°C
ESD Rating,
Note 3
..................................................... TBD
Operating Ratings
(Note 2)
Supply Voltages
+12V Input (V
12VIN
) ............................. +11.4V to +12.6V
–12V Input (V
M12VIN
) ........................... –11.4V to +12.6V
+5V Input (V
5VIN
) ................................... +4.25V to +5.25
+3.3V Input (V
3VIN
) .................................. +3.1V to +3.5V
Temperature Range (T
A
) ........................... –40°C to +85°C
Junction Temperature (T
J
) ........................................ 160°C
Package Thermal Resistance
(θ
JA
)
24-Lead TSSOP .................................................. 83°C/W
Electrical Characteristics
V
12VIN
= 12V, V
5VIN
= 5V, V
3VIN
= 3.3V, V
M12VIN
= –12V; T
A
= 25°C,
bold
values indicate –40°C
≤
T
A
≤
+85°C; unless noted
Symbol
I
12IN
I
5IN
I
3IN
I
12MIN
V
UVLO
Undervoltage Lockout
V
12VIN
increasing
V
12VIN
UVLO hysteresis
V
M12VIN
decreasing
V
M12VIN
UVLO hysteresis
V
5VIN
increasing
V
5VIN
UVLO hysteresis
V
3VIN
increasing
V
3VIN
UVLO hysteresis
V
5VGATE
V
3VGATE
I
5VGATE
I
3VGATE
V
PGTH
5VGATE Voltage
3VGATE Voltage
5VGATE Output Current
during start-up, V
5VGATE
= 5V
during turnoff; /FAULT = 0
3VGATE Output Current
during start-up, V
5VGATE
= 5V
during turnoff; /FAULT = 0
Power Good Threshold Voltage
V
12VOUT
increasing
V
12VOUT
Power-Good hysteresis
V
M12VOUT
decreasing
V
M12VOUT
Power-Good hysteresis
V
5VOUT
increasing
V
5VOUT
Power-Good hysteresis
V
3VOUT
increasing
V
3VOUT
Power-Good hysteresis
V
IL
V
IH
I
IL
Input Leakage Currnet (/ON)
Input Voltage Level (/ON)
logic low
logic high
2.0
–1
1
2.95
60
0.8
4.6
100
3.16
–11.2
300
4.8
11
200
–10.3
10.5
10.5
2.4
60
11
11
–40
6
–40
6
11.4
2.1
20
2.6
-10.5
100
3.1
8.9
300
-8.3
Parameter
Supply Current
Condition
/ON > V
IH
Min
Typ
2.2
4
0.23
3
Max
3
6
0.4
5
9.8
Units
mA
mA
mA
mA
V
mV
V
mV
V
mV
V
mV
V
V
µA
mA
µA
mA
V
mV
V
mV
V
mV
V
mV
V
V
µA
MIC2580
4
November 2001
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