SC4505EVB SEMTECH [Semtech Corporation], SC4505EVB Datasheet - Page 12

• Manufacturer Part Number: SC4505EVB
• Description: High Efficiency Boost Converter for Backlight/Flash LED Driver
• Manufacturer: SEMTECH [Semtech Corporation]

Layout Guideline
The SC4505 contains a boost converter. The placements
of the power components outside the SC4505 should
follow the guideline of general boost converter layout.
The application circuit (Figure 7a) will be used as an
example. The layout illustration diagram is shown as in
Figure 6a and Figure 6b.
POWER MANAGEMENT
Applications Information
2006 Semtech Corp.
EN_BL
PGND
EN_FL
PGND
VIN
FL_TRB
VIN
VIN
VIN
C4
C1
C2
L1
Figure 6b Layout Illustration -- Bottom Layer
Figure 6a Layout Illustration -- Top Layer
12
1
R3
SC4505
SC4505
R4
C3
D5
9
4
12
VOUT
As shown in Figure 6a, C1 serves as decoupling capacitor
for the SC4505. It should be placed close to the VIN
and PGND of SC4505 to achieve the best performance.
C2 is the input power filtering capacitor for the boost
converter power train. L1 is the boost converter input
inductor. D5 is the output rectifying diode. It is
recommended that a schottky diode is used for fast
reverse recovery.
C6
R2
C8
VOUT
C5
C7
D4
D9
D8
D3
D7
D2
D6
D1
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SC4505