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SC668 bảng dữ liệu(PDF) 23 Page - Semtech Corporation

tên linh kiện SC668
Giải thích chi tiết về linh kiện  8 LED Light Management Unit Automatic Dropout Prevention , Ambient Light Sense Input, PWM Dimming, and 4 LDOs
PDF  46 Pages
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nhà sản xuất  SEMTECH [Semtech Corporation]
Trang chủ  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC668 bảng dữ liệu(HTML) 23 Page - Semtech Corporation

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SC668
23
Applications Information (continued)
PCB Layout Considerations
The layout diagram in Figure 16 illustrates a two-layer
PCB layout for the SC668 and supporting components.
F o l l o w i n g f u n d a m e n t a l l a y o u t r u l e s i s
critical for achieving the performance specified in the
Electrical Characteristics table. The following guidelines
are recommended when developing a PCB layout:
Place all bypass and decoupling capacitors —
C
IN, CLDO1, CLDO2, CLDO3, CLDO4, and CBYP as close to
the device as possible.
Ensure that all connections to pins IN and OUT
make use of wide traces so that the resistive
drop on each connection is minimized.
The thermal pad should be connected to the
ground plane using multiple vias to ensure
proper thermal connection for optimal heat
transfer.
The following capacitors — C
LDO1, CLDO2, CLDO3,
C
LDO4, and CBYP should be grounded together.
Connect these capacitors to the ground plane at
one point near the SC668 as shown in Figure 16.
•
•
•
•
Figure 17 shows the component copper layer.
Make all ground connections to a solid ground
plane as shown in Figure 18.
All LDO output traces should be made as wide
as possible to minimize resistive losses.
•
•
Figure 16 — Recommended PCB Layout
Figure 17 — Layer 1
Figure 18 — Layer 2
CLDO1
BL8
BL7
PWM
SDA
SCL
LDO1
BL1
VIN
SC668
GND
VIN
ADI
CBYP
GND
GND
Ground
Plane
CIN
CLDO2
CLDO3
CLDO4



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