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STW41412 Datasheet(PDF) 24 Page - STMicroelectronics

Part # STW41412
Description  Single-coil dual-output step-down DC/DC converter for digital base band and multimedia processor supply
PDF  30 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STW41412 Datasheet(HTML) 24 Page - STMicroelectronics

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Application information
STw4141
24/30
4.7.1
PCB layout
Figure 16 and Figure 17 show the PCB layout. All components are on the top side of the
board.
4.7.2
TFBGA16 internal bumps access
Pad centers are at 500 µm distance. Pad diameter is 275 µm. The distance between two
adjacent pad edges is only 225 µm. We recommend a distance for lead-out signals from the
center of pad matrix by 75 µm wide trace. Isolation distance in this case is 75 µm (see
Figure 18 and Figure 19).
Figure 18.
TFBGA16 ball pad spacing and track parameters to internal pads
Figure 16.
Demoboard top layer
Figure 17.
Demoboard assembled with 22 µF
output capacitor
Grid dot distance :
with
A = 500
µm
B = 275
µm
C = 75
µm



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