SPICE

Document 267
SPICE Model – LPS4012
This lumped-element (SPICE) model data simulates the
frequency-dependent behavior of Coilcraft power inductors within the frequency range shown in the accompanying table for each individual inductor.
The data represents de-embedded measurements, as
described below. Effects due to different customer circuit board traces, board materials, ground planes or
interactions with other components are not included and
can have a significant effect when comparing the simulation to measurements of the inductors using other
production verification instruments and fixtures.
The value of the frequency-dependent variable resistor
RVAR1 is calculated from:
RVAR1 = k1 *
• k1 is shown for each value in the accompanying table.
• f is the frequency in Hz
• RVAR1 is the resistance in Ohms
The value of the frequency-dependent variable resistor
RVAR2 is calculated from:
RVAR2 = k2 *
Lumped Element Modeling Method
• k2 is shown for each value in the accompanying table.
Measurements were made using a 50 Ohm impedance
analyzer. Fixture compensation was performed to remove fixture effects. No DC bias current was applied in
any of the measurements. The lumped element values
were determined by optimizing the simulation model to
an average of the measurements. This method results in
a model that represents as closely as possible the typical
frequency-dependent behavior of the component within
the model frequency range.
• f is the frequency in Hz
The equivalent lumped element model schematic is
shown below. Each model should be analyzed only at
the input and output ports. Conclusions based on individual lumped element values may be erroneous.
• k3, k4, and k5 are shown in the accompanying table.
• RVAR2 is the resistance in Ohms
Note: The log function in the following equation is the
natural logarithm, base e, not base 10.
The value of the frequency-dependent inductance LVAR
is calculated from:
LVAR = k3 − k4
* LOG (k5 * f)
• f is the frequency in Hz
• LVAR is the inductance in µH
• LOG is the natural LOG (base e)
Disclaimer
RVAR2
VAR
C
R2
RVAR1
VAR
R1
LVAR
Coilcraft makes every attempt to provide accurate measurement data and software, representative of our components, in a usable format. Coilcraft, however, disclaims
all warrants relating to the use of its data and software,
whether expressed or implied, including without limitation any implied warranties of merchantability or fitness
for a particular purpose. Coilcraft cannot and will not be
liable for any special, incidental, consequential, indirect
or similar damages occurring with the use of the data
and/or software.
Specifications subject to change without notice.
© Coilcraft, Inc. 2007
Document 267-1 Revised 08/03/07
Document 267
SPICE Model for Coilcraft LPS4012 Power Inductors
Part number
LPS4012-331
LPS4012-681
LPS4012-102
LPS4012-152
LPS4012-222
LPS4012-332
LPS4012-472
LPS4012-562
LPS4012-682
LPS4012-103
LPS4012-153
LPS4012-223
LPS4012-333
LPS4012-473
LPS4012-683
LPS4012-104
LPS4012-124
LPS4012-154
LPS4012-184
LPS4012-224
LPS4012-334
LPS4012-474
LPS4012-564
LPS4012-684
LPS4012-824
LPS4012-105
LPS4012-155
LPS4012-185
LPS4012-225
LPS4012-335
Frequency limit
of model (MHz)
Lower Upper
0.1
100
0.1
200
0.1
100
0.1
100
0.1
100
0.1
100
0.1
100
0.1
100
0.1
80
0.1
60
0.1
40
0.1
40
0.1
40
0.1
40
0.1
30
0.1
20
0.1
20
0.1
10
0.1
10
0.1
8
0.1
7
0.1
7
0.1
5
0.1
5
0.1
5
0.1
5
0.1
3
0.1
2
0.1
2
0.1
1
LVAR Coefficients
⏲)
R1 (⏲
220
550
155
160
110
165
165
240
105
400
300
200
16
55
170
1000
150
3300
170
1080
1030
650
1000
280
280
275
1000
2000
5300
2100
⏲)
R2 (⏲
0.023
0.055
0.060
0.070
0.100
0.100
0.175
0.260
0.340
0.350
0.550
0.600
0.825
1.40
1.70
2.40
3.30
3.50
5.00
5.20
7.20
10.0
12.5
13.5
20.0
21.5
35.0
36.0
40.0
76.0
C (pF)
1.70
0.790
2.06
2.36
2.36
2.35
2.41
2.80
3.36
2.14
3.25
3.27
1.49
1.83
1.32
3.12
1.93
8.60
1.88
5.51
5.34
3.17
3.81
2.73
3.67
3.03
2.95
3.30
7.72
6.93
k1
6.00E-05
2.00E-06
6.00E-05
8.00E-05
9.00E-05
1.40E-04
7.00E-05
5.00E-05
5.00E-05
1.00E-05
1.00E-06
3.50E-04
2.00E-04
1.00E-06
2.00E-05
1.00E-06
4.00E-04
1.00E-06
1.00E-06
1.00E-06
1.00E-06
2.00E-03
1.00E-06
1.00E-04
1.00E-04
1.00E-06
1.00E-06
1.00E-06
1.00E-06
1.00E-06
k2
0.128
0.191
0.210
0.290
0.425
0.350
0.598
0.695
1.10
0.950
2.08
3.40
5.57
11.6
16.0
18.0
30.0
9.05
44.0
20.0
30.0
82.0
60.0
160
160
204
250
173
100
310
k3
0.33
0.68
1.0
1.5
2.2
3.3
4.7
5.6
6.8
10
15
22
33
47
68
100
120
150
180
220
330
470
560
680
820
1000
1500
1800
2200
3300
Specifications subject to change without notice.
© Coilcraft, Inc. 2006
k4
0.007
0.012
0.024
0.034
0.034
0.085
0.085
0.111
0.120
0.158
0.245
0.410
0.452
0.452
0.620
0.460
1.20
0.800
1.23
1.80
3.58
4.00
5.80
9.20
8.50
9.00
10.4
16.0
9.30
44
k5
9.70E-06
9.70E-06
9.70E-06
9.70E-06
9.60E-06
9.60E-06
9.70E-06
9.80E-06
9.90E-06
9.70E-06
9.90E-06
9.82E-06
9.86E-06
9.96E-06
9.96E-06
1.00E-05
1.00E-05
8.97E-06
1.01E-05
1.00E-05
1.02E-05
1.05E-05
1.05E-05
1.05E-05
1.11E-05
1.13E-05
1.26E-05
1.24E-05
3.06E-05
1.89E-05
Document 267-52 Revised 11/01/06