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11.2.5
1.8 V
The 1.8 V power plane is created using a switching regulator sourcing from the 5 V power rail on
the power supply. The 1.8 V plane powers the ICH3-S core logic, the 1.2 V regulator, and the Hub
Interface I/O rings of the Intel
maximum current. The Hub Interface on each Intel P64H2 device consumes about 2.66 A. The
Hub Interface on the ICH3-S device consumes about 550 mA of current. This regulator is required
in all designs.
11.2.6
1.2 V
The 1.2 V power plane powers the MCH core logic requiring 4.5 A. A switching regulator using
the 5 V power rail is the regulator's input to power the 1.2V plane.
11.2.7
5 VSB
The 5 VSB power plane comes directly off the 5 VSB power rail and provides 1.8 VSB power
through a linear regulator. The resume I/O segment of the ICH3-S requires 64 mA of current, while
the 5 VSB-to-1.8 VSB regulator requires 14.01 mA.
11.2.8
3.3 VSB
The 3.3 VSB power plane comes directly off the 3.3 VSB power rail. The power plane is used
solely for the resume I/O features of the Intel ICH3-S. This segment is given only about
64 mA. This regulator is required in all designs.
11.2.9
1.8 VSB
As stated before, the 1.8 VSB provides power to the resume logic within the Intel ICH3-S. This
logic uses about 14 mA. This regulator is required in all designs.
11.2.10
Power Summary
Table 86
datasheet.
Table 86.
Power Summary (Sheet 1 of 2)
Power Rail
0.7 - 1.708 V
1.05
2.5 V
1.25 V
1.8 V
1.2 V
Design Guide
®
Intel
Pentium
®
P64H2s. This voltage rail requires approximately 11.63 A
summarizes the platform power. For current up-to-date values, refer to each component's
Source
Voltage regulator
Voltage regulator
5 V power supply
5 V to 2.5 V switching regulator
5 V power supply
1.8 V switching regulator
®
M Processor and Intel
Platform Power Delivery Guidelines
Destination
CPU Core
CPU PSB, MCH PSB, Intel
MCH DDR
MCH DDR
®
Intel
P64H2, Intel ICH3-S
MCH
®
E7501 Chipset Platform
Max Current
32 A
®
ICH3-S
2.5 A
27 A
12.5 A
13.86 A
3.1 A
191
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