Specifications subject to change without notice.
Please check our website for latest information.
© Coilcraft, Inc. 2010
Coupled Inductors for SEPIC Applications–LPD4012 Series
Document 580-2
Revised 09/18/09
Document 580-2
Irms (A)
Inductance2
DCR max3
SRF typ4
Isat (A)5
both
one
Part number1
(µH)
(Ohms)
(MHz)
10% drop 20% drop 30% drop
windings6 winding7
LPD4012-331NL_
0.33 ±30%
0.042
255
5.2
5.4
5.6
1.87
2.65
LPD4012-561NL_
0.56 ±30%
0.087
185
3.7
3.8
3.9
1.30
1.84
LPD4012-821NL_
0.82 ±30%
0.100
130
3.2
3.3
3.4
1.21
1.72
LPD4012-152ML_
1.5 ±20%
0.134
86
2.6
2.7
2.8
1.05
1.48
LPD4012-222ML_
2.2 ±20%
0.176
70
2.3
2.4
2.5
0.91
1.29
LPD4012-332ML_
3.3 ±20%
0.242
48
1.8
1.9
2.0
0.78
1.10
LPD4012-472ML_
4.7 ±20%
0.370
39
1.6
1.7
1.8
0.63
0.89
LPD4012-562ML_
5.6 ±20%
0.467
32
1.5
1.6
1.6
0.56
0.79
LPD4012-682ML_
6.8 ±20%
0.500
31
1.3
1.4
1.5
0.54
0.77
LPD4012-822ML_
8.2 ±20%
0.545
29
1.1
1.2
1.3
0.52
0.74
LPD4012-103ML_
10 ±20%
0.638
25
0.98
1.0
1.1
0.48
0.68
LPD4012-153ML_
15 ±20%
0.940
21
0.79
0.82
0.84
0.40
0.56
LPD4012-223ML_
22 ±20%
1.52
15
0.74
0.78
0.79
0.31
0.44
LPD4012-333ML_
33 ±20%
1.74
12
0.45
0.47
0.48
0.29
0.41
LPD4012-473ML_
47 ±20%
2.20
8.8
0.35
0.37
0.38
0.26
0.37
LPD4012-683ML_
68 ±20%
3.19
7.8
0.30
0.32
0.33
0.21
0.30
LPD4012-823ML_
82 ±20%
3.41
7.3
0.26
0.28
0.30
0.21
0.29
LPD4012-104ML_
100 ±20%
4.76
6.1
0.24
0.26
0.27
0.18
0.25
LPD4012-124ML_
120 ±20%
5.20
5.3
0.23
0.24
0.25
0.17
0.24
LPD4012-154ML_
150 ±20%
6.90
4.6
0.21
0.22
0.23
0.15
0.21
LPD4012-184ML_
180 ±20%
7.90
4.1
0.18
0.19
0.20
0.14
0.19
LPD4012-224ML_
220 ±20%
9.80
3.3
0.150
0.16
0.17
0.12
0.17
LPD4012-334ML_
330 ±20%
15.12
2.8
0.140
0.145
0.150
0.10
0.14
LPD4012-474ML_
470 ±20%
20.90
2.3
0.100
0.110
0.120
0.08
0.12
LPD4012-564ML_
560 ±20%
22.10
2.1
0.090
0.105
0.115
0.08
0.12
1. Please specify termination and packaging codes:
LPD4012-564M
LC
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
Temperature rise = Winding power loss ×
135°C
W
Winding power loss = (
+
) × DCR in Watts (W)
II
L1
2
L2
2
Equal current in each winding (1.05 A):
Winding power loss = (1.05 + 1.05 ) × 0.134 = 0.296 W
Temperature rise = 0.296 W ×
135°C
W
= 40°C
22
Unequal current (II
L1
L2
ower loss = (1.3 + 0.7 ) × 0.134 = 0.292 W
Temperature rise = 0.292 W ×
135°C
W
= 39.4°C
22
= 1.3 A,
= 0.7 A):
Winding p
Examples for LPD4012-152ML:
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.
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