Intel Pentium 4 Processor VR-Down Design Guidelines
Table Of Contents
- Output Requirements
- Voltage and Current REQUIRED
- Voltage Tolerance REQUIRED
- Load Line Definitions REQUIRED
- Processor Electrical And Thermal Current Support EXPECTED
- No-Load Operation EXPECTED
- Turn-on Response Time PROPOSED
- Processor Power Sequencing REQUIRED
- Overshoot at Turn-On or Turn-Off REQUIRED
- Converter Stability REQUIRED
- Thermal Monitoring PROPOSED
- Input Voltage and Current
- Control Inputs REQUIRED
- Power Good Output (PWRGD) PROPOSED
- Efficiency PROPOSED
- Fault Protection
Intel
®
Pentium
®
4 Processor VR-Down Design Guidelines
11
Figure 5: Processor Current during Thermal Monitor Operation
Notes:
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Duration of on-off periods depends on processor speed: faster processors have shorter durations.
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Other operating system-controlled events could have on-times as short as 700 internal clock cycles.
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A possible worst-case routine could cause processor Icc to go through a 100% → 40% → 100% set of transitions
within 30-50 cycles.
100%
40%
50%
5%
1
2
1
400
100%
40%
50%
5%
1
5-10
250
20
100% I
max
2.1 -
2.6 µs
2.2 -
2.7 µs
5% I
max
Units
• % of Icc-max
• number of clock cycles