BL3406B-2.5V 데이터 시트보기 (PDF) - Shanghai Belling Co., Ltd.
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BL3406B-2.5V Datasheet PDF : 11 Pages
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BL3406B
1.5 MHz, 800mA Synchronous Buck Converter
frequency. Ceramic capacitors with X5R or
X7R dielectrics are recommended due to
their low ESR and high ripple current. The
output ripple ∆VOUT is determined by:
∆VOUT
≤
VOUT×(VIN −VOUT)
VIN × fOSC×L
×
ESR+
8×
1
fOSC×C2
Layout Considerations
When laying out the printed circuit board, the
following checklist should be used to ensure
proper operation of the BL3406B. These
items are also illustrated graphically in
Figures 5 and 6. Check the following in your
layout:
1. The power traces, consisting of the GND
trace, the SW trace and the VIN trace
should be kept short, direct and wide.
2. Does the VFB pin connect directly to the
feedback resistors? The resistive divider
R1/R2 must be connected between the (+)
plate of Cout and ground.
3. Does the (+) plate of CIN connect to VIN as
closely as possible? This capacitor
provides the AC current to the internal
power MOSFETS.
4. Keep the switching node, SW, away from
the sensitive VFB node.
5. Keep the (-) plates of CIN and COUT as
close as possible.
2.7V - 4.2V
VIN
C1
4.7uF
4 VIN
L1
SW 3 2.2µH
BL3406B-ADJ
C3
22pF
1 Run
VFB 5
R2
GND
200k
R1
100k
2
VOUT1.8V
C2
10uF
2.7V - 4.2V
VIN
C1
4.7uF
4 VIN
L1
SW 3 2.2µH
BL3406B-18
1 Run
VOUT 5
GND
2
VOUT1.8V
C2
10uF
Figure 3. BL3406B-ADJ Layout Circuit
Figure 4. BL3406B-1.8 Layout Circuit
Figure 5. BL3406B-ADJ Suggested Layout
Figure 6. BL3406B-1.8 Suggested Layout
PPMIC BU
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9
BL3406B Rev 1.5
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10/2009
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