AP1522
Step-Up DC/DC Converter
Typical Application Circuit (Continued)
Step up DC-DC Regulator
V
IN
2.5V~3.3V
L
22uH
D
V
OUT
4.8V
C
IN
4.7uF
V
IN
SHDN
GND
SW
FB
57K
4.7pF
AP1522
C
OUT
4.7uF
20K
1-Cell Li-lon to 3.3V SEPIC Converter
V
IN
2.5V to 4.2V
5
V
IN
C1
4.7uF
4
SHDN
GND
2
20K
AP1522
L1
10uH
C3
1uF
D1
3.3V
50mA
L2 33K
10uH
3
4.7pF
C2
10uF
1
SW
FB
4-Cell to 5V SEPIC Converter
V
IN
3V to 6V
5
V
IN
C1
4.7uF
4
SHDN
GND
2
10K
AP1522
L1
10uH
C3
1uF
D1
5V
40mA
L2
10uH
3
30K 4.7pF
C2
10uF
1
SW
FB
Anachip Corp.
www.anachip.com.tw
4/8
Rev. 1.0
May. 5, 2005