Document 580-1
Coupled Inductors–LPD4012
For SEPIC and other
Applications
The LPD4012 coupled miniature shielded inductors are
only 1,1 mm high and 4 mm square. Their excellent
coupling coefficient (k
≥
0.94) makes them ideal for use
in SEPIC applications. In SEPIC topologies, the re-
quired inductance for each winding in a coupled induc-
tor is half the value needed for two separate inductors,
allowing selection of a part with lower DCR and higher
current handling.
These inductors provide high efficiency and excellent
current handling in a rugged, low cost part.
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.
0.155 ±0.003
3,94 ±0,076
1
4
D1
Dot indicates pin 1
+
L1
C1
V
IN
+
+
V
OUT
2
XXX X
Dash
number
0.155 ±0.003
3,94 ±0,076
3
Q1
L2
C2
Load
–
–
Internal
code
Typical SEPIC schematic
Refer to Application Note, Document 639,
“Selecting Coupled Inductors for SEPIC Applications”
0.0433 ±0.004
1,10 ±0,10
Recommended
Land Pattern
1
4
0.103 0.049
2,606 1,24
0.031
0,78
45°
typ
0.174
4,40
2
3
0.060
1,52
1
L1
2
L2
4
0.049
1,24
0.103
2,606
0.174
4,40
3
Dimensions are in
inches
mm
Core material
Ferrite
Core and winding loss
See www.coilcraft.com/coupledloss
Weight
54 – 64 mg
Terminations
RoHS compliant silver-palladium-platinum-glass frit.
Other terminations available at additional cost.
Ambient temperature
–40°C to +85°C with
Irms
current, +85°C to
+125°C with derated current
Storage temperature
Component: –40°C to +125°C.
Packaging: –40°C to +80°C
Winding to winding isolation
100 V
Resistance to soldering heat
Max three 40 second reflows at
+260°C, parts cooled to room temperature between cycles
Moisture Sensitivity Level (MSL)
1 (unlimited floor life at <30°C /
85% relative humidity)
Failures in Time (FIT) / Mean Time Between Failures (MTBF)
38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332
Packaging
1000/7″reel; 3500/13″ reel Plastic tape: 12 mm wide,
0.25 mm thick, 8 mm pocket spacing, 1.32 mm pocket depth
Recommended pick and place nozzle
OD: 4 mm; ID:
≤
2 mm
PCB washing
Only pure water or alcohol recommended
Document 580-1
Revised 02/04/10
Specifications subject to change without notice.
Please check our website for latest information.
© Coilcraft, Inc. 2010
Document 580-2
Coupled Inductors for SEPIC Applications – LPD4012 Series
Inductance
2
Part number
1
LPD4012-331NL_
LPD4012-561NL_
LPD4012-821NL_
LPD4012-152ML_
LPD4012-222ML_
LPD4012-332ML_
LPD4012-472ML_
LPD4012-562ML_
LPD4012-682ML_
LPD4012-822ML_
LPD4012-103ML_
LPD4012-153ML_
LPD4012-223ML_
LPD4012-333ML_
LPD4012-473ML_
LPD4012-683ML_
LPD4012-823ML_
LPD4012-104ML_
LPD4012-124ML_
LPD4012-154ML_
LPD4012-184ML_
LPD4012-224ML_
LPD4012-334ML_
LPD4012-474ML_
LPD4012-564ML_
DCR max
3
(Ohms)
0.042
0.087
0.100
0.185
0.235
0.320
0.500
0.620
0.530
0.600
0.750
1.13
1.63
1.83
2.52
3.23
3.66
4.76
5.54
6.90
8.75
11.24
17.00
24.50
26.00
SRF typ
4
(MHz)
255
185
130
86
70
48
39
32
31
29
25
21
15
12
8.8
7.8
7.3
6.1
5.3
4.6
4.1
3.3
2.8
2.3
2.1
(µH)
0.33 ±30%
0.56 ±30%
0.82 ±30%
1.5 ±20%
2.2 ±20%
3.3 ±20%
4.7 ±20%
5.6 ±20%
6.8 ±20%
8.2 ±20%
10 ±20%
15 ±20%
22 ±20%
33 ±20%
47 ±20%
68 ±20%
82 ±20%
100 ±20%
120 ±20%
150 ±20%
180 ±20%
220 ±20%
330 ±20%
470 ±20%
560 ±20%
Isat
(A)
5
10% drop 20% drop 30% drop
5.2
3.7
3.2
2.50
2.30
1.80
1.60
1.50
1.20
1.10
0.98
0.90
0.70
0.37
0.33
0.27
0.27
0.22
0.21
0.18
0.16
0.15
0.13
0.10
0.07
5.4
3.8
3.3
2.81
2.40
1.90
1.70
1.60
1.52
1.20
1.00
0.72
0.82
0.57
0.39
0.36
0.27
0.28
0.26
0.26
0.21
0.16
0.16
0.11
0.14
5.6
3.9
3.4
2.91
2.50
2.00
1.80
1.60
1.63
1.30
1.10
0.74
0.84
0.58
0.40
0.37
0.29
0.29
0.27
0.27
0.23
0.17
0.16
0.12
0.15
Irms
(A)
both
one
windings
6
winding
7
1.87
1.30
1.21
1.15
0.95
0.75
0.65
0.55
0.60
0.55
0.50
0.43
0.34
0.31
0.28
0.25
0.23
0.20
0.19
0.17
0.14
0.12
0.10
0.09
0.08
2.65
1.84
1.72
1.62
1.35
1.06
0.92
0.78
0.86
0.78
0.71
0.60
0.48
0.44
0.39
0.36
0.31
0.27
0.27
0.23
0.18
0.17
0.14
0.13
0.12
1. Please specify
termination
and
packaging
codes:
LPD4012-564MLC
Termination: L
= RoHS compliant Silver-palladium-platinum-glass frit.
Special order:
T
= RoHS tin-silver-copper (95.5/4/0.5) or
S
= non-RoHS
tin-lead (63/37).
Packaging: C
= 7″ machine-ready reel. EIA-481 embossed plastic
tape (1000 parts per full reel).
B
= Less than full reel. In tape, but not machine ready. To
have a leader and trailer added ($25 charge), use
code letter D instead.
D
= 13″ machine-ready reel. EIA-481 embossed plastic
tape. Factory order only, not stocked (3500 parts per
full reel).
2. Inductance shown for each winding, measured at 100 kHz, 0.1 Vrms,
0 Adc on an Agilent/HP 4284A LCR meter or equivalent. When leads are
connected in parallel, inductance is the same value. When leads are
connected in series, inductance is four times the value.
3. DCR is for each winding. When leads are connected in parallel, DCR is
half the value. When leads are connected in series, DCR is twice the
value.
4. SRF measured using an Agilent/HP 4191A or equivalent. When leads
are connected in parallel, SRF is the same value.
5. DC current, at which the inductance drops the specified amount from its
value without current. It is the sum of the current flowing in both
windings.
6. Equal current when applied to each winding simultaneously that causes
a 40°C temperature rise from 25°C ambient. See temperature rise
calculation.
7. Maximum current when applied to one winding that causes a 40°C
temperature rise from 25°C ambient. See temperature rise calculation.
8. Electrical specifications at 25°C.
Refer to Doc 639 “Selecting Coupled Inductors for SEPIC Applications.”
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Temperature rise calculation based on specified
Irms
Winding power loss = (
I
L12
+
I
L22
) × DCR in Watts (W)
135°C
Temperature rise = Winding power loss ×
W
Examples for LPD4012-821ML:
Equal current in each winding (1.21 A):
Winding power loss = (1.21
2
+ 1.21
2
) × 0.10 = 0.293 W
Temperature rise = 0.293 W × 135°C = 39.6°C
W
Unequal current (I
L1
= 1.5 A,
I
L2
= 0.8 A):
Winding power loss = (1.5
2
+ 0.8
2
) × 0.10 = 0.289 W
135°C = 39.0°C
Temperature rise = 0.289 W ×
W
Coupled Inductor Core and Winding Loss Calculator
This web-based utility allows you to enter frequency, peak-to-peak (ripple)
current, and
Irms
current to predict temperature rise and overall losses,
including core loss. Visit www.coilcraft.com/coupledloss.
Specifications subject to change without notice.
Please check our website for latest information.
Document 580-2
Revised 02/04/10
© Coilcraft, Inc. 2010
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