RT8009 データシートの表示（PDF） - Richtek Technology
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RT8009 Datasheet PDF : 13 Pages
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` Connect feedback network behind the output capacitors.
Keep the loop area small. Place the feedback
components near the RT8009.
` Connect all analog grounds to a command node and
then connect the command node to the power ground
behind the output capacitors.
` An example of 2-layer PCB layout is shown in Figure 7
and Figure 8 for reference.
VIN
1
RT8009
VIN
LX
5
L1
4.7uH
R3
C1
3 EN
FB 4
C3
C2
4.7uF
GND
2
VOUT
R1
C4
R2 10uF
RT8009
Figure 7. Top Layer
Figure 6. EVB Schematic
Figure 8. Bottom Layer
Recommended component selection for Typical Application
Table 1. Inductors
Component Supplier Series Inductance (uH) DCR (mΩ) Current Rating (mA) Dimensions (mm)
TAIYO YUDEN NR 3015
2.2
60
148 0
3x3x1.5
TAIYO YUDEN NR 3015
4.7
1 20
102 0
3x3x1.5
Sumida
CDRH2 D14
2.2
75
150 0
4.5 x3 .2x 1.55
Sumida
CDRH2 D14
4.7
1 35
100 0
4.5 x3 .2x 1.55
GOTREND
GT SD32
2.2
58
150 0
3.8 5x 3.85 x1. 8
GOTREND
GT SD32
4.7
1 46
1100
3.8 5x 3.85 x1. 8
Com ponent Supplier
TDK
TDK
M URATA
M URATA
M URATA
TAIYO YUDEN
TAIYO YUDEN
TAIYO YUDEN
Table 2. Capacitors for CIN and COUT
Part No.
Capacitance (uF)
C160 8J B0J 47 5M
4. 7
C201 2J B0J 10 6M
10
GRM1 88R6 0J4 75K E 19
4. 7
GRM2 19R6 0J 106 ME1 9
10
GRM2 19R6 0J1 06K E 19
10
J MK 107 BJ 47 5RA
4. 7
JM K1 07B J1 06M A
10
J MK 212B J 106 RD
10
Case Size
060 3
080 5
060 3
080 5
080 5
060 3
060 3
080 5
DS8009-03 March 2007
www.richtek.com
11
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