MIC2778 Micrel Semiconductor, MIC2778 Datasheet - Page 2

• Manufacturer Part Number: MIC2778
• Description: Mic2778 Voltage Monitor With Adjustable Hysteresis
• Manufacturer: Micrel Semiconductor

Typical Application
March 2005
/FORCE_ONA
/FORCE_ONB
GPI_A0
GPI_B0
SMBus I/O
100k
Controller
Hot-Plug
Address
100k
/PWRGDA
/PWRGDB
SMBus
AUXENA
AUXENB
/FAULTA
/FAULTB
Base
SDA
SCL
/INT
ONA
ONB
10k x 3
V
100k
STBY
System
Supply
Power
100k
V
VSTBY
STBY
+3.3V
+12V
V
V
C1
STBY
STBY
110k
C2
10k x 4
10k x 4
1%
20
35
28
38
45
42
44
43
31
36
41
40
39
37
47
48
2
9
4
6
1
0.1µF
RFILTER[A&B]
CFILTERA
CFILTERB
A0
A1
A2
/INT
SCL
SDA
SDA
SCL
/INT
/FORCE_ONA
/FORCE_ONB
GPI_A0
GPI_B0
AUXENA
AUXENB
ONA
ONB
/PWRGDA
/PWRGDB
/FAULTA
/FAULTB
VSTBYA
11
Management
MIC2592B
Controller
VSTBYB
26
2
12VSENSEA
12VSENSEB
3VSENSEA
3VSENSEB
0.1µF
12VGATEA
12VGATEB
12VOUTA
3VGATEA
12VOUTB
3VGATEB
3VOUTA
3VOUTB
12VINA
12VINB
VAUXA
VAUXB
3VINA
3VINB
GND
GND
GND
15
5
8
3
10
12
13
14
16
32
29
34
27
25
24
23
21
22
17
33
46
#
6800pF
* Values for R
#
¥ Bold lines indicate high current paths
C
#
C
MILLER
22nF
22nF
depending upon the C GS of the external MOSFETs.
These components are not required for MIC2592B
operation but can be implemented for GATE output
slew rate control (application specific)
#
GATE
22nF
C
#
C
GS
0.1F
0.1F
0.1F
GS
0.1F
*R
#
6800pF
*R
*R
C
12VGATE[A/B]
12VGATEA
15
15
MILLER
3VGATEA
#
22nF
12VGATEB
15
C
GATE
*R
3VGATEB
15
and R
3VGATE[A/B]
Si4435DY
Si4420DY
Si4435DY
Si4420DY
R
0.020
R
0.020
R
0.013
R
0.013
SENSE
SENSE
SENSE
SENSE
may vary
PCI Express Connector
PCI Express Connector
M9999-033105
12V
2.1A (x4/x8)
3.3V
3.0A
12V
2.1A (x4/x8)
3.3V
3.0A
3.3AUX
375mA
PCI
Express
Bus
PCI
Express
Bus
3.3AUX
375mA