Micrel, Inc.
MIC2590B
September 2008
2
M9999-091808
Typical Application
VAUXA
5VINA
12VIN1 12VIN2    12MVIN1 12MVIN2
5VSENA
5VGATEA
5VOUTA
VSTBY1
VSTBY2
12SLEWA
12SLEWB
CFILTERA
3.3VAUXA
PCI Bus
5V, 5A
3VINA
3VSENSEA
3VGATEA
3VOUTA
12VOUTA
12MVOUTA
5VINB
3.3V, 7.6A
12V, 0.5A
12V, 0.1A
5VSENSEB
5VGATEB
5VOUTB
3VINB
3VSENSEB
3VGATEB
3VOUTB
12VOUTB
12MVOUTB
VAUXB
5V, 5A
3.3V, 7.6A
12V, 0.5A
12V, 0.1A
3.3VAUXB
R
SENSE
R
5VGATEA
R
3VGATEA
R
5VGATEB
R
3VGATEB
R
SENSE
R
SENSE
C
GATE
C
GATE
R
SENSE
PCI Bus
4.7礔
4.7礔
4.7礔
4.7礔
MIC2590B
IREF
CFILTERB
GND
AUXENA/AUXENB
/FAULTA, /FAULTB
A0
A1
A2
/INT
SCL
SDA
PCI
Connector
Power
Supply
+12V
12V
+5.0V
+3.3V
VSTBY
1A Schotty Diode
(Clamp)
/INT
SCL
SDA
SMBus I/O
Management
Controller
2
SDA
SCL
/INT
20k
1%
Hot-Plug
Controller
ONA/ONB
AUXENA/AUXENB
/FAULTA, /FAULTB
ONA/ONB
2
2
C
GATE
C
GATE
A
Bus Switch
B
/OE