PM6641TR STMicroelectronics, PM6641TR Datasheet - Page 27
PM6641TR
Manufacturer Part Number
PM6641TR
Description
IC CTLR DDR2/3 MONO VR 48VFQFPN
Manufacturer
STMicroelectronics
Datasheet
1.PM6641TR.pdf
(47 pages)
Specifications of PM6641TR
Applications
Converter, DDR2, DDR3
Voltage - Input
2.7 ~ 5.5 V
Number Of Outputs
3
Voltage - Output
0.8 ~ 5.5 V
Operating Temperature
0°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
48-VFQFN
For Use With
497-8425 - KIT EVAL PM6641 CHIPSET/DDR2/3
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-6893-2
PM6641TR
PM6641TR
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PM6641TR
Manufacturer:
STM
Quantity:
35 839
PM6641
7.5
Output voltage divider
PM6641 switching regulators are adjustable voltage converters.
If the feedback pin (VFB_1S8, VFB_1S5, VFB_1S05 respectively belonging to
VDDQ (1.8 V), 1.5 V, 1.05 V rail) is directly tied to the rail output capacitor the internal divider
with pre-fixed output voltage value is activated and the nominal output voltages are
selected.
If the feedback pin is connected to the output voltage divider central tap (as depicted in
Figure 30
Figure 30. SW regulator with external divider
the PM6641 switching regulator automatically recognizes the external divider and the output
voltage is regulated to the following value:
Equation 5
)
Doc ID 13510 Rev 3
Vout
R
R
1
2
_
1
Sxx
=
⎛
⎜ ⎜
⎝
VFB_1Sxx
Vout_1Sxx
R
R
2
1
+
1
⎞
⋅ ⎟ ⎟
⎠
0
8 .
V
Device description
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