User's Manual

11-29-1999_14:46 31
VOLTAGE REGULATORS
Q18
MMBT3904LT1
B
C
E
R383
1K 1K
R382
100-1%
R133
100-1%
R134
301-1%
R311
131-1%
R309
R146
1.21K-1%
1%
R141
301
9,11,18,33
PWROK
R330
1K
1K
R340
R331
1K
11,33
SLP_S3#
VR8
3
2
1
U18
7
14
6
5
4
VR4
LT1585A-1_5
3
2
1
VD_G2VD_G1 VD_G3
VCC1_8_ADJ
VCC2_5_ADJ
VDDQ_FB
VDDQ_COMP_R
7.5K-1%
R137
VDDQ_G VDDQ_G2
U14
12
7
14
C347
47UF
C324
47UF
1UF-X7R
C104
12
1UF-X7R
C268
21
100UF
C124
21
100UF
C142
12
100UF
C319
12
C159
100UF
21
100UF
C167
12
1UF-X7R
C35
12
C161
1UF-X7R
12
C91
100UF
21
C193
10UF
12
C174
1UF 21
47UF
C173
21
1UF-X7R
C200
21
C225
1UF-X7R
21
1UF-X7R
C211
12
C179
1UF-X7R
21
VR5
3
2
1
C160
220UF
21
VDDQ_COMP
330UF-T510
C15
21
LT1575
VR6
4
3
2
1
5
6
7
8
10PF
C164
C168
47UF
21
22UF
C242
12
VCC5DUAL_R
MMBT3904LT1
Q13
E
C
B
LT1529-3_3
VR1
6
24
51
3
Q6
1
2
3
1500UF
C352
21 1500UF
C336
12
R135
5.1-5%
21
TYPEDET#
TYPEDET_R#
SI4562DY
Q12
8
5
2
4
1
3
7
6
100UF
C311
21
C368
100UF
12
100UF
C372
21
R379
10K
2.2K
R158
MMBT3904LT1
Q7
E
C
B
R381
1K
BAT17
CR11
A
C
PCD PLATFORM DESIGN
REV:
DRAWN BY:
LAST REVISED:
PROJECT:
SHEET:
FOLSOM, CALIFORNIA 95630
1900 PRAIRIE CITY ROAD
87654321
A
B
C
D
12345678
D
C
B
A
TITLE: INTEL(R) 820 CHIPSET DUAL PROCESSOR CUSTOMER REFERENCE BOARD
3.03
OF 38
R
VCC3_3
1
3
2
VCC1_8
VCC3_3SBY
VCC5
VCC5DUAL
VCC5
VTT1_5
VCC3_3
VCC3_3SBY
VCC3_3
VCC5DUAL
VCC12
VCC3_3
VCC12
VCC5SBY
VCC5SBY
VIN
VOUT
ADJ
LT1587ADJ
74LS132
VCC
GND
VCC5SBY
VIN
VOUT
GND
SN74LVC07A
GND
VCC
VDDQ
+ + +
+
+
+
+
+
+
+
+
+
+
+ + + +
VIN
VOUT
ADJ
LT1587ADJ
+
+
IPOS
INEG
GATE
COMP
SHDN
VIN
GND
FB
+
+
1
3
2
VIN VOUT
SHDN#
GND3
TAB
SENSE
IRL2203NS
1
3
2
+ +
D1
D2A
G1
G2
S1
S2
D1A
D2
+ + +
VCC2_5
VCC1_8
1
3
2
VCC2_5SBY
- +
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
VCC3_3SBY VOLTAGE REGULATOR
AGP VDDQ VOLTAGE REGULATOR
VCC 5V DUAL VOLTAGE SWITCHER
VCC2_5 VOLTAGE REGULATOR
VCC 1.8 VOLTAGE REGULATOR
SN74LVC07A has 5V input and output tolerance.
Route VR6 GND to VDDQ output caps and then via to ground.
Voltage Regulators
Place C311 at regulator.
Place C108, C333 at RIMMs