Datasheet LT1610 (Analog Devices) - 7

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