Intel VC820 - Desktop Board Motherboard Design Manual page 192

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
9,31
5
PWROK
7,9,16,31 VD_G1
7 GND GND
SN74LVC07A
VCC3_3
VTT 1.5 VOLTAGE REGULATOR
VR4
LT1587-1_5
VOUT
3
VIN
1 1 GND
2 2
B
VCC 1.8 VOLTAGE REGULATOR
VCC3_3
VR8
LT1587ADJ
2
VOUT
3
VIN
1 VCC1_8_ADJ
1 1 ADJ
A
2 2
8 7
6
VCC5SBY VCC5
VCC12
C347
47UF
Q12
SI4562DY
S1
1
VCC5DUAL_R
VCC5SBY G1
2
S2
3
G2
4
C
Q13
3
R340
2
B 1
VD_G2 VD_G3 2
1K
E
VTT1_5
2
1
1
2
VCC1_8 VCC2_5SBY
BAT17
A C
1 1 1
CR11
2 2 2
Place C311 at regulator.
Place C108 and C333 at RIMM termination
6
5 4
VCC5DUAL
C324
47UF
1 1
No stuff R363
D1
8
2 2
D1A
7
D2
6
D2A
5
VCC3_3
VCC1_8
VR_SHUTDOWN
Q16 C
R360
3 TYPEDET#
VR_SDB B 1 19
10K
2
E
VCC2_5 VOLTAGE REGULATOR
VCC5
VR5
LT1587ADJ
2
VOUT
3
VIN
1 VCC2_5_ADJ
1 1 ADJ
2 2
5 4
3 2
AGP VDDQ VOLTAGE REGULATOR
VCC3_3
VCC12
1
1
2
2
VR6
LT1575
1 8
1
SHDN IPOS
2 7
VIN INEG
R135
3 6 VDDQ_G VDDQ_G2 1
GND GATE
2
5.1-5%
4 5
FB COMP
VDDQ_COMP
C164 10PF
R137
2 1 VDDQ_COMP_R
+
C168
7.5K-1%
0.001UF
VDDQ_FB
Q7 C
3
B 1
2
E
Route VR6 GND to VDDQ output caps and then via to ground.
VCC2_5
VCC5DUAL
VCC3_3SBY VOLTAGE REGULATOR
1 VR1
LT1529-3_3
5
VIN
2 1
1
4
SHDN# SENSE
2
2
TITLE: INTEL(R) 820 CHIPSET 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
1 1 1 1 1
2 2 2 2 2
B
VCC3_3SBY
1
VOUT
1
2
2
A
REV:
1.01
DRAWN BY: PROJECT:
LAST REVISED: SHEET:
11-18-1999_11:24 29 OF 36
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