參數(shù)資料
型號(hào)： PM6641TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, QCC48
封裝： 7 X 7 MM, 1 MM HEIGHT, LEAD FREE, VQFP-48
文件頁數(shù)： 36/47頁
文件大?。?/td> 2254K
代理商： PM6641TR
PM6641
Application examples
Doc ID 13510 Rev 3
41/47
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
相關(guān)PDF資料
PDF描述
PM6641 SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, QCC48
PM6670ASTR 3 A SWITCHING CONTROLLER, QCC24
PM6670AS 3 A SWITCHING CONTROLLER, QCC24
PM6670A 1.4 A SWITCHING CONTROLLER, QCC24
PM6670STR 3 A SWITCHING CONTROLLER, QCC24
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