rt8009 Richtek Technology Corporation, rt8009 Datasheet - Page 2

• Manufacturer Part Number: rt8009
• Description: 1.25mhz, 600ma, High Efficiency Step-down Dc/dc Converter
• Manufacturer: Richtek Technology Corporation

RT8009
Typical Application Circuit
Layout Guide
www.richtek.com
2
Layout note:
1. The distance that C
2. C
OUT
V
C
should be placed near RT8009.
IN
IN
GND
VIN
EN
IN
1
2
3
connects to V
5
4
2.5V to 5.5V
2.5V to 5.5V
LX
VOUT
V
IN
V
L
IN
IN
Figure 2. Adjustable Voltage Regulator
is as close as possible (Under 2mm).
C
Figure 1. Fixed Voltage Regulator
OUT
V
4.7uF
GND
C
OUT
4.7uF
C
IN
IN
1
3
1
3
EN
VIN
VIN
EN
RT8009
Figure 3
GND
RT8009
GND
2
VOUT
2
FB
LX
LX
5
4
4.7uH
5
4
V
C
L
IN
IN
4.7uH
L
C1
GND
VIN
EN
R1
R2
C
10uF
1
2
3
10uF
C
OUT
V
OUT
OUT
V
OUT
5
4
LX
FB
V
with
V
DS8009-03 March 2007
OUT
REF(Typ.)
L
R2
R1
=
R1
C1
+
V
C
R2
REF
OUT
=
0.5V
≤
x
V
V
GND
1M
OUT
OUT
⎛
⎜
⎝
1
Ω
+
R2
and
R1
⎞
⎟
⎠