Micrel, Inc.
MIC2593
Typical Application
Power
Supply
+12V
12V
+5.0V
+3.3V
0.1µF
0.1µF
VSTBY
0.1µF
5
32
17
18
0.1µF
PCI Connector
12VINA 12VINB
VSTBYA
12MVINA 12MVINB
VAUXA
5VINA
15
PCI Bus
0.1µF
11
6
0.1µF
26
VSTBYB
5VSENSEA
7
R
SENSE
*R
12VGATEA
3.3VAUXA
375mA
3
34
12VSLEWA
12VSLEWB
5VGATEA
5VOUTA
3VINA
8
0.01µF
9
Si4420DY
**C3
**C4
12
0.1µF
13
R
SENSE
2
35
CFILTERA
CFILTERB
3VSENSEA
3VGATEA
*R
3VGATEA
V
STBY
**C1
**C2
14
16
10
19
Si4420DY
3.3V, 7.6A
12V, 0.5A
–12V, 0.1A
100k
GPIA
GPIB
100k
4
38
GPIA
GPIB
MIC2593
3VOUTA
12VOUTA
12MVOUTA
V
STBY
C
GATE
0.01µF
31
5VINB
10k × 4
AUXENA
AUXENB
ONA
ONB
Hot Plug
Controller
V
STBY
45
42
44
43
0.1µF
30
5VSENSEB
AUXENA
AUXENB
ONA
ONB
R
SENSE
*R
12VGATEB
5VGATEB
5VOUTB
29
0.01µF
28
Si4420DY
5V, 5A
0.1µF
10k × 2
/FAULTA
/FAULTB
1
36
3VINB
/FAULTA
/FAULTB
A0
A1
A2
/INT
SCL
SDA
3VSENSEB
3VGATEB
3VOUTB
12VOUTB
12MVOUTB
VAUXB
GND
GND
R
SENSE
25
24
*R
3VGATEB
23
21
27
20
22
33
46
Si4420DY
3.3V, 7.6A
12V, 0.5A
–12V, 0.1A
3.3VAUXB
41
SMBus
Base
Address
V
STBY
40
39
37
47
48
C
GATE
0.01µF
10k × 3
SDA
SMBus I/O
SCL
/INT
*
PCI Bus
SDA
SCL
/INT
Management
Controller
PCI Connector
Values for R
5VGATE[A/B]
and R
3VGATE[A/B]
may vary depending upon the C
GS
of the external MOSFETs.
** Values determined by design requirements. See “Functional Description” section for detailed information.
# MBRS140T3 or equivalent is recommended.
Bold lines indicate high current paths
September 2008
2
M9999-092208
MICREL [ MICREL SEMICONDUCTOR ]
