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3-20-2000_10:15 34
VOLTAGE REGULATORS
100-1%
R538
100-1%
R539
100-1%
R133
100-1%
R134
301-1%
R311
131-1%
R309
5.1-5%
R135
R146
1.21K-1%
1%
R141
301
7,8,9,36
PWROK
R331
1K
8,9,36
SLP_S3#
VR8
3
2
1
U18
7
14
6
5
4
VD_G2VD_G1 VD_G3
VCC2_5_ADJ
VDDQ_FB
VDDQ_COMP_R
7.5K-1%
R137
VDDQ_G VDDQ_G2
U14
12
7
14
C324
47UF
1UF-X7R
C104
1
2
1UF-X7R
C268
2
1
100UF
C124
2
1
100UF
C142
1
2
100UF
C319
1
2
C159
100UF
2
1
100UF
C167
1
2
C161
1UF-X7R
1
2
C193
10UF
1
2
C174
1UF
2
1
47UF
C173
2
1
1UF-X7R
C200
2
1
C225
1UF-X7R
2
1
1UF-X7R
C211
1
2
C179
1UF-X7R
2
1
VR5
3
2
1
C160
220UF
21
VDDQ_COMP
LT1575
VR6
4
3
2
1
5
6
7
8
10PF
C164
C168
0.001UF
21
22UF
C242
1
2
1500UF
C352
2
1
1500UF
C336
1
2
R340
1K
C311
100UF
2
1
R330
1K
C347
47UF
VCC5DUAL_R
R158
2.2K
R360
10K
24
TYPEDET#
R361
1K
R362
1K
VR_SDB
R218
1K
VR_SHUTDOWN
R363
0K
Q6
1
2
3
Q7
MMBT3904LT1
E
C
B
Q16
MMBT3904LT1
B
C
E
MMBT3904LT1
Q13
E
C
B
SI4562DY
Q12
8
5
2
4
1
3
7
6
VCC1_8_ADJ
VR4
1
2
3
VR1
3
2
1
100UF
C91
1
2
C35
1UF-X7R
1
2
C15
100UF
2
1
VCC2_5SBY_ADJ
VCC5_MTH_SBY
VCC3_3
VCC3_3SBY
VCC5
VCC2_5
VCC5
VTT1_5
VCC3_3
VCC3_3
VCC5DUAL
VCC12
VCC12
VCC5SBY
VIN
VOUT
ADJ
LT1587ADJ
74LS132
VCC
GND
VCC5SBY
SN74LVC07A
GND
VCC
VDDQ
+ +
+
+
+
+
+
+
+
+
+
+
+
+
+
VIN
VOUT
ADJ
LT1587ADJ
+
IPOS
INEG
GATE
COMP
SHDN
VIN
GND
FB
+
+
+
+
+
DRAWN BY:
LAST REVISED: SHEET:
FOLSOM, CALIFORNIA 95630
1900 PRAIRIE CITY ROAD
87 6 54 32 1
A
B
C
D
12345678
D
C
B
A
PCG PLATFORM DESIGN
REV:
0.5
PROJECT:
OF 40
TITLE: INTEL(R) 820E CHIPSET 2 DIMM FCPGA REFERENCE BOARD
R
PCG AE Camino2
VCC5SBY
VCC3_3
VCC1_8
VCC1_8
IRL2203NS
1
3
2
1
3
2
1
3
2
1
3
2
D1
D2A
G1
G2
S1
S2
D1A
D2
LT1585A
VIN
VOUT
GND
VIN
VOUT
ADJ
LT1587ADJ
+
+
+
VCC2_5SBY_MTH
It should be used only for further regulation of lower voltage power planes
The VCC5DUAL plane should not drive any logic components requiring 5V.
because the true voltage of VCC5DUAL will not remain constant
Rdson of the FET is not negligible for large currents
VTT 1.5 VOLTAGE REGULATOR
AGP VDDQ VOLTAGE REGULATOR
VCC 5V DUAL VOLTAGE SWITCHER
VCC2_5 VOLTAGE REGULATOR
VCC 1.8 VOLTAGE REGULATOR
Voltage Regulators
SN74LVC07A has 5V input and output tolerance.
No stuff R363
Place C311 at regulator.
VCC2_5SBY VOLTAGE REGULATOR
Route VR6 GND to VDDQ output caps and then via to ground.