SI9140DQ VISHAY [Vishay Siliconix], SI9140DQ Datasheet - Page 9

• Manufacturer Part Number: SI9140DQ
• Description: MP Controller For High Performance Process Power Supplies
• Manufacturer: VISHAY [Vishay Siliconix]

DESCRIPTION OF OPERATION
Schematics of the Si9140 dc-to-dc conversion solutions for
high-performance PC microprocessors are shown in Figure 1
and 2 respectively. These solutions are geared to meet the
extremely demanding transient regulation and power
requirements of these new microprocessors at minimal cost
Document Number: 70026
S-40699—Rev. H, 19-Apr-04
2 x 220 mF
OS-CON
(V
2 x 220 mF
5 V
(V
OS-CON
IN
5 V
C5, 180 pF
IN
)
10 V
C5, 180 pF
)
C4, 5.6 pF
C1
10 V
C4, 5.6 pF
C1
+
C6
0.1 mF
C6
0.1 mF
+
4.99 k
4.99 k
240 k
R6
V
240 k
R5
R6
V
CCP
R5
CCP
R1
20 k
R4
40.2 k
R1
20 k
R4
24.9 k
C7
0.1 mF
C7
0.1 mF
R2
10 k
R2
10 k
1
2
3
4
5
6
7
8
Power-Good
1
2
3
4
5
6
7
8
Power-Good
MON
FB
V
V
COMP
NI
V
GND
MON
FB
V
V
COMP
NI
V
GND
DD
GOOD
REF
DD
GOOD
REF
Si9140
Si9140
U1
UVLO
U1
ENABLE
UVLO
FIGURE 2. 2.5 V @ 8.5 A
ENABLE
PGND
C
R
FIGURE 1.
PGND
R3
100
C
R
OSC
OSC
SET
DR
D
OSC
OSC
V
SET
C3
0.1 mF
R3
100
DR
D
V
S
S
S
S
C3
0.1 mF
16
15
14
13
12
11
10
9
16
15
14
13
12
10
11
9
2.9 V @ 10 A
and with a minimal parts count. The two solutions are nearly
identical, except for slight variations in output voltage, load
transient amplitude, and specified power. Figure 3 is a
schematic diagram for a 3.3-V logic converter.
R13
10 k
R13
10 k
220 pF
220 pF
R9
11 k
R9
11 k
C9
1 mF
C9
1 mF
C8
C8
2 x Si4435DY
2 x Si4435DY
2 x Si4410DY
Si4410DY
R8
40.2 k
R7
100 k
R8
40.2 k
R7
100 k
R10
14.2 k
0.1%
R10
20 k
0.1%
C10, 180 pF
C10, 180 pF
3 x 330 mF 6.3V
6.3V OS-CON
D1
D1FS4
D1
D1FS4
3 x 330 mF
Vishay Siliconix
1.5 mH
OS-CON
1.5 mH
L1
13.3 k,
13.3 k,
L1
0.1%
0.1%
R11, 4.7 k
R12
R12
R11, 4.7 k
C2
C2
Coiltronics
CTX07-12877
+
Coiltronics
CTX07-12877
+
www.vishay.com
Si9140
2.9 V
(V
2.5 V
(V
OUT
OUT
)
)
9