Low Voltage Distribution; Figure 7-3. Low Voltage Supply - Compaq Deskpro 4000N Technical Reference Manual

7.3.2

LOW VOLTAGE DISTRIBUTION

The system board includes a provision for producing 2.5 VDC for microprocessors that require
such a level for core power. The low voltage circuitry (Figure 7-3) consists of a power MOSFET
and regulator components that produce 2.8 VDC, plus or minus 3.57%.
Power Supply
Assembly
Microprocessor
Figure 7–3. Low Voltage Supply, Block Diagram
2SK1388
+3.3 VDC
Regulator
+12 VDC
Circuit
2.5 V Proc. Detect
Compaq Deskpro 4000N and 4000S Personal Computers
First Edition - September 1997
Technical Reference Guide
+2.8 VDC
Microprocessor
7-5