Intel VC820 - Desktop Board Motherboard Design Manual page 234

8 7
Voltage Regulators
VCC 5V DUAL VOLTAGE SWITCHER
The VCC5DUAL plane should not drive any logic components requiring 5V.
It should be used only for further regulation of lower voltage power planes
because the true voltage of VCC5DUAL will not remain constant
D
Rdson of the FET is not negligible for large currents
SN74LVC07A has 5V input and output tolerance.
VCC5SBY VCC3_3SBY
U18
U14
74LS132 VCC
14 VCC
4
SLP_S3#
C 6 1
11,33
5
PWROK
9,11,18,33 VD_G1
7 GND GND
SN74LVC07A
VCC3_3
VTT 1.5 VOLTAGE REGULATOR
VR4
LT1585A-1_5
VOUT
3
VIN
GND
B
VCC 1.8 VOLTAGE REGULATOR
VCC3_3
VR8
LT1587ADJ
2
VOUT
3
VIN
1 VCC1_8_ADJ
ADJ
A
8 7
6
VCC5SBY
VCC12
C347
47UF
VCC5SBY
VCC5DUAL_R
C
Q13
3
R340
2
B 1
VD_G2 VD_G3 2
1K
E
VTT1_5
2
1
VCC1_8
VCC2_5SBY
BAT17
CR11
VCC5
Place C311 at regulator.
Place C108, C333 at RIMMs
6
5 4
VCC5
VCC5DUAL
C324
47UF
Q12
SI4562DY
S1 D1
1 8
G1 D1A
2 7
S2 D2
3 6
G2 D2A
4 5
VCC3_3
VCC1_8
Q18 C
3
B 1
2
E
R379
TYPEDET#
21
10K TYPEDET_R#
VCC2_5
VCC2_5 VOLTAGE REGULATOR
VR5
LT1587ADJ
2
VOUT
3
VIN
1 VCC2_5_ADJ
ADJ
5 4
3 2
AGP VDDQ VOLTAGE REGULATOR
VCC3_3
VCC12
VR6
LT1575
1 8
SHDN IPOS
2 7
VIN INEG
R135
3 6 VDDQ_G VDDQ_G2 1
GND GATE
5.1-5%
4 5
FB COMP
VDDQ_COMP
C164 10PF
R137
VDDQ_COMP_R
+
2 1
C168
7.5K-1%
47UF
VDDQ_FB
Q7 C
3
B 1
2
E
Route VR6 GND to VDDQ output caps and then via to ground.
VCC5DUAL
VCC3_3SBY VOLTAGE REGULATOR
VR1
LT1529-3_3
5
VIN
4
SHDN# SENSE
TITLE: INTEL(R) 820 CHIPSET DUAL PROCESSOR CUSTOMER REFERENCE BOARD
VOLTAGE REGULATORS
PCD PLATFORM DESIGN
R
1900 PRAIRIE CITY ROAD
FOLSOM, CALIFORNIA 95630
3 2
1
D
VDDQ
220UF
+
1 2
C160
Q6
3
3
1
2
2
C
B
VCC3_3SBY
1
VOUT
2
A
REV:
3.03
DRAWN BY: PROJECT:
LAST REVISED: SHEET:
11-29-1999_14:46 31 OF 38
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