Document 713-1
Coupled Inductors–LPR4012
For DC-DC converters
and other applications
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.
Part number
1
LPR4012-202AML_
LPR4012-202BML_
LPR4012-202DML_
LPR4012-202LML_
LPR4012-103BML_
LPR4012-103DML_
LPR4012-223BML_
LPR4012-223DML_
Primary (L1)
inductance
2
± 20% (µH)
2.0
2.0
2.0
2.0
10.0
10.0
22.0
22.0
Turns
ratio
1
:
1.5
1
:
2
1
:
3
1
:
10
1
:
2
1
:
3
1
:
2
1
:
3
DCR max (Ohms)
L1
L2
0.240
0.240
0.240
0.240
0.600
0.600
1.16
1.16
0.255
0.400
1.15
9.64
1.55
3.71
3.65
7.08
SRF
typ
3
(MHz)
61.5
49.4
31.0
7.43
19.5
12.8
11.2
8.00
Isat
(A)
4
10% drop 20% drop 30% drop
1.71
1.71
1.71
1.71
0.62
0.62
0.43
0.43
1.73
1.73
1.73
1.73
0.64
0.64
0.45
0.45
1.74
1.74
1.74
1.74
0.65
0.65
0.46
0.46
Irms
(A)
5
20°C rise 40°C rise
1.10
1.10
1.10
1.10
0.52
0.52
0.43
0.43
1.45
1.45
1.45
1.45
0.70
0.70
0.57
0.57
1. Please specify
termination
and
packaging
codes:
LPR4012-223XMLC
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.
Specifications subject to change without notice.
Please check our website for latest information.
Document 713-1
Revised 10/05/09
© Coilcraft, Inc. 2009
Document 713-2
Coupled Inductors – LPR4012 Series
+
D
C
L2
+
V
IN
SW
V
OUT
AUX
–
+
L1
D
C
V
OUT
–
–
Typical Buck Converter with auxiliary output
+
D
+
L1
L2
C
V
OUT
V
IN
C
PWM
–
Core material
Ferrite
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)
Mean Time Between Failures (MTBF)
26,315,789 hours
Failures in Time (FIT)
38 per one billion hours
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
–
Current Derating
Typical Flyback Converter
120
110
100
Dot indicates pin 1
Percent of rated current
90
80
70
60
50
40
20
10
0
-40
-20
30
Isat
Irms
0
20
1
4
1
0.155 ±0.003
3,94 ±0,076
L1
2
L2
4
2
XXXX
Dash
number
3
3
0.0433 ±0.004
1,10 ±0,10
0.155 ±0.003
3,94 ±0,076
Recommended
Land Pattern
1
4
25°C
40
60
80
100
120 140
Ambient temperature (°C)
45°
typ
0.174
4,40
0.103 0.049
2,606 1,24
0.031
0,78
2
3
0.060
1,52
Dimensions are in
inches
mm
0.049
1,24
0.103
2,606
0.174
4,40
Specifications subject to change without notice.
Please check our website for latest information.
Document 713-2
Revised 10/05/09
© Coilcraft, Inc. 2009
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