RT8008
Typical Application Circuit
L
2.2µH
4
1
3
5
V
V
OUT
IN
VIN
RT8008
LX
2.2V to 5.5V
C
IN
4.7µF
C
OUT
EN
VOUT
10µF
GND
2
Figure 1. Fixed Voltage Regulator
L
2.2µH
4
V
3
IN
V
VIN
RT8008
OUT
LX
FB
2.2V to 5.5V
C
IN
C1
4.7µF
R1
R2
C
OUT
1
5
EN
10µF
GND
2
I
R2
R1
R2
⎛
⎞
⎟
VOUT = VREF x 1+
⎜
⎝
⎠
with R2 = 300kΩ to 60kΩ so the IR2 = 2μA to 10μA,
and (R1 x C1) should be in the range between 3x10-6 and 6x10-6 for component selection.
Figure 2. Adjustable Voltage Regulator
Layout Guide
GND
GND
V
V
V
V
IN
IN
OUT
L
OUT
L
C
C
C
C
OUT
LX
IN
IN
OUT
LX
4
3
2
1
4
3
2
1
VIN
FB
VIN
GND
EN
GND
EN
C1
5
5
VOUT
R1
R2
V
OUT
GND
GND
Figure 3
Layout note:
1. The distance that CIN connects to VIN is as close as possible (Under 2mm).
2. COUT should be placed near RT8008.
www.richtek.com
2
DS8008-07 March 2011
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
