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PM6641 bảng dữ liệu(PDF) 41 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Monolithic VR for chipset and DDR2/3 supply for ultra-mobile PC (UMPC) applications
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PM6641
Application examples
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9
Application examples
The following application examples are typical or customized applications. Each example
has been tested and evaluated and the schematic and BOM are available for reference
design.
9.1
UMPC DDR2 and chipset power supply
Figure 34. System architecture for DDR2 and chipset power supply
This application is conceived for real estate constrained portable equipment with DDR2
memory. An input power voltage pre-regulated to 3.3 V or 5 V is available and the available
output maximum power levels are shown in Figure 34. The switching regulator average load
is estimated to be about 50 % of the maximum load; this upper limit must be respected in
order to avoid dangerous stresses for internal power MOSFETs. The following table
resumes these current values.
Table 12. Expected average and peak currents for DDR2 and chipset power supply
Output rail
Max non continuous load [A]
Expected average load [A]
1.8 V (VDDQ)
2.5
1.3
0.9 V (VTT)
±2
0.3
1.5 V
2.8
1.4
1.05 V
4
2
PM6641
3.3V
VDDQ
1.8V @
VTT (LDO)
0.9V @ 2A
1.5V @
1.05V @ 4A
2.5A
2.8A



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