Document 528-1
For SEPIC and other
Applications
Coupled Inductors
–
MSD1260
The excellent coupling coefficient (k ≥ 0.94) makes the
MSD1260 series of coupled inductors ideal for use in
SEPIC applications. In SEPIC topologies, the required
inductance for each winding in a coupled inductor is half
the value needed for two separate inductors, allowing
selection of a part with lower DCR and higher current
handling.
These parts provide high inductance, high efficiency
and excellent current handling in a rugged, low cost
part. They are also well suited for use as a VRM
inductors in high-current DC-DC converters and VRM/
VRD controllers.
They can also be used as two single inductors con-
nected in series or parallel, as a common mode choke
or as a 1 : 1 transformer.
0.484
max
D1
12,3
+
+
L1
Q1
C1
Dot indicates pin1
+
Parts manufactured
prior to Sept. 2007
were marked with
1 2 3
V
V
OUT
L2
C2
Load
IN
0.484
12,3
Dash number
max
only the dash number.
X
Internal code
–
–
Typical SEPIC schematic
Refer to Application Note, Document 639,
“Selecting Coupled Inductors for SEPIC Applications”
0.236 ±0.008
6,0 ±0,2
Recommended
Land Pattern
Core material Ferrite
0.217
5,5
0.197
5,0
Terminations RoHS compliant matte tin over nickel over phos
bronze. Other terminations available at additional cost.
0.157
4,0
0.138
3,5
Weight: 2.8 – 3.2 g
2
3
1
4
3
4
1
Ambient temperature –40°C to +85°C with Irms current, +85°C to
+125°C with derated current
0.197
5,0
0.177
4,5
2
Storage temperature Component: –40°C to +125°C.
Packaging: –40°C to +80°C
Winding to winding isolation 500 Vrms
0.059
1,5
0.079
2,0
Resistance to soldering heat Max three 40 second reflows at
+260°C, parts cooled to room temperature between cycles
inches
mm
Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30°C /
85% relative humidity)
1
2
Dimensions are in
L1
L2
Failures in Time (FIT) / Mean Time Between Failures (MTBF)
38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332
4
3
Packaging 500/13″ reel; Plastic tape: 24 mm wide, 0.35 mm thick,
16 mm pocket spacing, 6.6 mm pocket depth
PCB washing Only pure water or alcohol recommended
Specifications subject to change without notice.
Please check our website for latest information.
Document528-1 Revised12/05/08
© Coilcraft, Inc. 2010