DS8008-07 Datasheet, PDF (12/14 Pages) Richtek Technology Corporation – 2.5V to 5.5V Input Range

RT8008
} Connect feedback network behind the output capacitors.
Keep the loop area small. Place the feedback
components near the RT8008.
} 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
to Figure 8 for reference.
V_IN
4
RT8008
VIN
LX
3
L1
1 _EN
C3
J1
FB ⁵
GND ²
V_IN
V_OUT
C1
R1
C4
C2
R2 ^10uF
Figure 6. EVB Schematic
Figure 7. Top Layer
Figure 8. Bottom Layer
Suggested Inductors
Component
Supplier
TAIYO YUDEN
TAIYO YUDEN
Sumida
Sumida
GOTREND
GOTREND
Series
NR 3015
NR 3015
CDRH2D14
CDRH2D14
GTSD32
GTSD32
Inductance
(µH)
2.2
4.7
2.2
4.7
2.2
4.7
DCR
(mΩ)
60
120
75
135
58
146
Current Rating
(mA)
1480
1020
1500
1000
1500
1100
Dimensions
(mm)
3 x 3 x 1.5
3 x 3 x 1.5
4.5 x 3.2 x 1.55
4.5 x 3.2 x 1.55
3.85 x 3.85 x 1.8
3.85 x 3.85 x 1.8
Suggested Capacitors for C_IN and C_OUT
Component Supplier
TDK
TDK
MURATA
MURATA
MURATA
TAIYO YUDEN
TAIYO YUDEN
TAIYO YUDEN
Part No.
C1608JB0J475M
C2012JB0J106M
GRM188R60J475KE19
GRM219R60J106ME19
GRM219R60J106KE19
JMK107BJ475RA
JMK107BJ106MA
JMK212BJ106RD
Capacitance (µF)
4.7
10
4.7
10
10
4.7
10
10
Case Size
0603
0805
0603
0805
0805
0603
0603
0805
www.richtek.com
12
DS8008-07 March 2011