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SC121 датащи(PDF) 20 Page - Semtech Corporation

номер детали SC121
подробное описание детали  Low Voltage Synchronous Boost Regulator
PDF  23 Pages
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производитель  SEMTECH [Semtech Corporation]
домашняя страница  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC121 датащи(HTML) 20 Page - Semtech Corporation

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SC121
20
GND
VIN
CIN
SC121
FB
EN
IN
LX
LX
R2
(2
nd layer)
OUT
GND
7.0mm
5.2mm
CFB
R1
VOUT
COUT
Figure 4 — Layout Drawing
PCB Layout Considerations
Poor layout can degrade the performance of the DC-DC
converter and can contribute to EMI problems, ground
bounce, and resistive voltage losses. Poor regulation and
instability can result.
The following simple design rules can be implemented to
ensure good layout:
Place the inductor and filter capacitors as close
to the device as possible and use short wide
traces between the power components.
Route the output voltage feedback path away
from the inductor and LX node to minimize
noise and magnetic interference.
•
•
Maximize ground metal on the component side
to improve the return connection and thermal
dissipation. Separation between the LX node
and GND should be maintained to avoid cou-
pling capacitance between the LX node and the
ground plane.
Use a ground plane with several vias connecting
to the component side ground to further reduce
noise interference on sensitive circuit nodes.
A suggested layout is shown in Figure 4.
•
•
Applications Information (continued)



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