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SC250 датащи(PDF) 10 Page - Semtech Corporation

номер детали SC250
подробное описание детали  Step-Down DC-DC Converter with Bias LDO for RF Power Amplifi ers
PDF  18 Pages
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производитель  SEMTECH [Semtech Corporation]
домашняя страница  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC250 датащи(HTML) 10 Page - Semtech Corporation

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© 2006 Semtech Corp.
www.semtech.com
SC250
PRELIMINARY
POWER MANAGEMENT
Applications Information (Cont.)
PCB Layout Considerations
Poor layout can degrade the performance of the DC-
DC converter and can be a contributory factor in EMI
problems, ground bounce and resistive voltage losses.
Poor regulation and instability can result.
A few 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 and V
DAC path away
from inductor and LX node to minimize noise and
magnetic interference.
1.
2.
Maximize ground metal on component side to improve
the return connection and thermal dissipation.
Separation between the LX node and GND should be
maintained to avoid coupling of switching noise to the
ground plane.
To further reduce noise interference on sensitive
circuit nodes, use a ground plane with several vias
connecting to the component side ground.
3.
4.
LX
LOUT
COUT
SC250
VOUT
VREF
GND
CREF
VIN
CIN
VDAC
EN
PGND
1



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