Datasheet

7
LT1610
APPLICATIONS INFORMATION
WUU
U
A SEPIC (Single-Ended Primary Inductance Converter)
schematic is shown in Figure 4. This converter topology
produces a regulated output over an input voltage range
1
2
8
7
3
4
6
5
C2
LT1610
V
IN
GND
SHUTDOWN
R1
R2
MULTIPLE
VIAs
GROUND PLANE
1610 F05
+
C3
D1
V
OUT
L1 L2
C1
+
Figure 5. Recommended Component Placement for SEPIC
SHUTDOWN
C2
22µF
6.3V
C1
22µF
6.3V
L1
22µH
L2
22µH
C3
1µF
CERAMIC
D1
INPUT
Li-ION
3V to 4.2V
V
OUT
3.3V
120mA
1610 F04
+
+
1M
604k
C1, C2: AVX TAJA226M006
C3: AVX 1206YC105 (X7R)
D1: MOTOROLA MBR0520
L1, L2: MURATA LQH3C220 (UNCOUPLED)
OR SUMIDA CLS62-220 (COUPLED)
65
•
•
2
3
4
7
8
1
V
IN
SW
PGND
FB
SHDN
GND
COMP
LT1610
V
C
Figure 4. Li-Ion to 3.3V SEPIC DC/DC Converter
that spans (i.e., can be higher or lower than) the output.
Recommended component placement for a SEPIC is
shown in Figure 5.