© Coilcraft, Inc. 2009
Specifications subject to change without notice.
Please check our website for latest information.
Document 713-1
CoupledInductors–LPR4012
The LPR4012 miniature shielded coupled inductors are
only 1,1 mm high and 4 mm square. The excellent
coupling coefficient (k = 0.95) makes them ideal for use
as flyback transformers in DC-DC converters or as
coupled inductors in buck regulators to provide multiple
outputs. The wide selection of turns ratios makes them
suitable for a variety of voltage step-up and step-down
applications. They can also be used in autotransformer
applications.
The high
Isat and low DCR ratings of these low profile
parts provide high efficiency and excellent current han-
dling in a rugged, low cost design.
Custom inductance values and turn ratios are available
upon request.
Document 713-1
Revised 10/05/09
Primary (L1)
SRF
inductance2
Turns
DCR max (Ohms)
typ3
Isat(A)4
Irms(A)5
Part number1
± 20% (µH)
ratio
L1
L2
(MHz)
10% drop 20% drop 30% drop
20°C rise 40°C rise
LPR4012-202AML_
2.0
1 : 1.5
0.240
0.255
61.5
1.71
1.73
1.74
1.10
1.45
LPR4012-202BML_
2.0
1 : 2
0.240
0.400
49.4
1.71
1.73
1.74
1.10
1.45
LPR4012-202DML_
2.0
1 : 3
0.240
1.15
31.0
1.71
1.73
1.74
1.10
1.45
LPR4012-202LML_
2.0
1 : 10
0.240
9.64
7.43
1.71
1.73
1.74
1.10
1.45
LPR4012-103BML_
10.0
1 : 2
0.600
1.55
19.5
0.62
0.64
0.65
0.52
0.70
LPR4012-103DML_
10.0
1 : 3
0.600
3.71
12.8
0.62
0.64
0.65
0.52
0.70
LPR4012-223BML_
22.0
1 : 2
1.16
3.65
11.2
0.43
0.45
0.46
0.43
0.57
LPR4012-223DML_
22.0
1 : 3
1.16
7.08
8.00
0.43
0.45
0.46
0.43
0.57
1. Please specify termination and packaging codes:
LPR4012-223XM
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 is measured at 100 kHz, 0.1 Vrms, 0 Adc on an Agilent/HP 4284A LCR meter or equivalent.
3. SRF measured using an Agilent/HP 4191A or equivalent. When leads are connected in parallel, SRF is the same value.
4. DC current applied to L1, at which the inductance drops the specified amount from its value without current.
5. Current applied to L1 that causes the specified temperature rise from 25°C ambient.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
For DC-DC converters
and other applications
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