Document 580-1
Coupled Inductors – LPD4012
For Flyback, SEPIC
and other Applications
• Only 1.1 mm high and 4 mm square
• Ideal for use in flyback, multi-output buck and SEPIC
applications.
• High inductance, high efficiency and excellent current handling
• Can also be used as two single inductors connected in
series or parallel or as a common mode choke.
+
D
+
L1
V
IN
C
SW
L2
C
V
OUT
–
–
Typical Flyback Converter
+
C
V
OUT
AUX
L2
+
0.155 ±0.003
3,94 ±0,076
1
4
D
–
+
SW
D
V
IN
L1
C
V
OUT
Dot indicates pin 1
–
–
Typical Buck Converter with auxiliary output
+
L1
V
IN
2
XXX X
Dash
number
0.155 ±0.003
3,94 ±0,076
3
D
C1
Q
+
C
V
OUT
C
L2
Internal
code
–
0.0433 ±0.004
1,10 ±0,10
Recommended
Land Pattern
1
4
0.103 0.049
2,606 1,24
2
0.031
0,78
45°
typ
0.174
4,40
3
0.060
1,52
1
L1
2
L2
4
0.049
1,24
0.103
2,606
0.174
4,40
Dimensions are in
inches
mm
3
Core material
Ferrite
Core and winding loss
Go to online calculator
+
+
Weight
54 – 64 mg
L2
C1
Environmental
RoHS compliant, halogen free
Q
V
Terminations
RoHS compliant matte tin over nickel over silver.
OUT
D
C
C
V
IN
L1
Other terminations available at additional cost.
Ambient temperature
–40°C to +85°C with
Irms
current, +85°C to
–
–
+125°C with derated current
Typical Zeta
–40°C to +125°C.
Storage temperature
Component:
schematic
Tape and reel 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
Tested with pure water or alcohol only. For other solvents,
see Doc787_PCB_Washing.pdf.
Document 580-1
Revised 07/10/13
Typical SEPIC schematic
–
US
+1-847-639-6400 sales@coilcraft.com
UK
+44-1236-730595 sales@coilcraft-europe.com
Taiwan
+886-2-2264 3646 sales@coilcraft.com.tw
China
+86-21-6218 8074 sales@coilcraft.com.cn
Singapore
+ 65-6484 8412 sales@coilcraft.com.sg
© Coilcraft Inc. 2014
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.
Document 580-2
Coupled Inductors for SEPIC Applications – LPD4012 Series
Part number
1
LPD4012-331NR_
LPD4012-561NR_
LPD4012-821NR_
LPD4012-152NR_
LPD4012-222NR_
LPD4012-332NR_
LPD4012-472MR_
LPD4012-562MR_
LPD4012-682MR_
LPD4012-822MR_
LPD4012-103MR_
LPD4012-153MR_
LPD4012-223MR_
LPD4012-333MR_
LPD4012-473MR_
LPD4012-683MR_
LPD4012-823MR_
LPD4012-104MR_
LPD4012-124MR_
LPD4012-154MR_
LPD4012-184MR_
LPD4012-224MR_
LPD4012-334MR_
Inductance DCR max SRF typ
(µH)
(Ohms)
(MHz)
2
3
4
Coupling Leakage
coefficient
L typ
5
typ
(µH)
0.94
0.95
0.97
0.97
0.98
0.98
0.98
0.99
0.99
0.99
0.99
0.99
0.99
>0.99
>0.99
>0.99
>0.99
>0.99
>0.99
>0.99
>0.99
>0.99
>0.99
0.06
0.08
0.09
0.11
0.14
0.16
0.18
0.20
0.22
0.24
0.26
0.30
0.34
0.41
0.51
0.66
0.75
0.86
0.98
1.19
1.40
1.66
2.45
10%
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
Isat
(A)
6
20%
30%
drop
drop
5.4
3.8
3.3
2.81
2.40
1.90
1.70
1.60
1.52
1.20
1.00
0.92
0.82
0.57
0.39
0.36
0.27
0.28
0.26
0.26
0.21
0.16
0.16
5.6
3.9
3.4
2.91
2.50
2.00
1.80
1.60
1.63
1.30
1.10
0.94
0.84
0.58
0.40
0.37
0.29
0.29
0.27
0.27
0.23
0.17
0.16
Irms
(A)
both
one
windings
7
winding
8
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
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
0.33 ±30%
0.56 ±30%
0.82 ±30%
1.5 ±30%
2.2 ±30%
3.3 ±30%
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%
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
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
1. Please specify
termination
and
packaging
codes:
LPD4012-334MRC
Termination: R
= RoHS compliant, matte tin over nickel over silver.
Special order:
Q
= RoHS tin-silver-copper (95.5/4/0.5) or
P
= 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. Leakage Inductance is for L1 and is measured with L2 shorted.
6. 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.
7. Equal current when applied to each winding simultaneously that
causes a 40°C temperature rise from 25°C ambient. See temperature
rise calculation.
8. Maximum current when applied to one winding that causes a 40°C
temperature rise from 25°C ambient. See temperature rise calculation.
9. 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.
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.
Go to online calculator.
US
+1-847-639-6400 sales@coilcraft.com
UK
+44-1236-730595 sales@coilcraft-europe.com
Taiwan
+886-2-2264 3646 sales@coilcraft.com.tw
China
+86-21-6218 8074 sales@coilcraft.com.cn
Singapore
+ 65-6484 8412 sales@coilcraft.com.sg
Document 580-2
Document 580-2
Revised 07/10/13
Revised 02/15/11
© Coilcraft Inc. 2014
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.
Document 580-3
Coupled Inductors for SEPIC Applications – LPD4012 Series
Typical L vs Current
1000
330 µH
Typical L vs Frequency
1000
330 µH
100 µH
33 µH
10 µH
3.3 µH
1.5 µH
100
100 µH
33 µH
100
Inductance (µH)
10
10 µH
3.3 µH
1.5 µH
Inductance (µH)
10
1
0.33 µH
1
0.33 µH
0.1
0.01
0.1
Current (A)
1
10
0.1
0.1
1
Frequency (MHz)
10
100
Typical Current Derating
120
110
100
Percent of rated current
90
80
70
60
50
40
20
10
0
30
Isat
Irms
-40
-20
0
20
25°C
40
60
80
100
120 140
Ambient temperature (°C)
US
+1-847-639-6400 sales@coilcraft.com
UK
+44-1236-730595 sales@coilcraft-europe.com
Taiwan
+886-2-2264 3646 sales@coilcraft.com.tw
China
+86-21-6218 8074 sales@coilcraft.com.cn
Singapore
+ 65-6484 8412 sales@coilcraft.com.sg
Document 580-3
Document 580-3
Revised 07/10/13
Revised 02/15/11
© Coilcraft Inc. 2014
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.
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