1278 COUPLED INDUCTORS
High Reliability Coupled Inductors
ML612PND
The ML612PND series of coupled inductors was designed
for high temperature applications – up to 155°C. The
excellent coupling coefficient (k
≥
0.98) makes it ideal
for use in SEPIC applications. In SEPIC topologies, the
required inductance for each winding in a coupled induc-
tor is half the value needed for two separate inductors,
allowing selection of a part with lower DCR and higher
current handling.
These inductors provide high inductance, high efficiency,
excellent current handling and 500 V isolation in a very
rugged part. They are well suited for use as VRM induc-
tors in high-current DC-DC and VRM/VRD controllers.
They can also be used as two single inductors connected
in series or parallel, as a common mode choke or as a
1 : 1 transformer.
+
L1
V
IN
Q1
C1
D1
+
+
Load
V
OUT
L2
C2
–
Refer to Application Note, Document 639,
“Selecting Coupled Inductors for SEPIC Applications”
–
Typical SEPIC schematic
Dimensions are in
inches
mm
Core material
Ferrite
Terminations
Matte tin over nickel over phos bronze.
Weight:
3.8 g – 4.6 g
Ambient temperature
–55°C to +105°C with
Irms
current, +105°C
to +155°C with derated current
Storage temperature
Component: –55C to +155°C.
Tape and reel packaging: –55°C to +80°C
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)
Winding-to-winding and winding-to-core isolation
500 Vrms
Enhanced crush-resistant packaging
500/13″ reel;
Plastic tape: 24 mm wide, 0.4 mm thick, 16 mm pocket spacing,
8.1 mm pocket depth
®
Specifications subject to change without notice.
Please check our website for latest information.
Document ML704-1
Revised 07/13/12
1102 Silver Lake Road
Cary IL 60013
© Coilcraft, Inc. 2012
Phone 800-981-0363
Fax 847-639-1508
E-mail cps@coilcraft.com
Web www.coilcraft-cps.com
1278 COUPLED INDUCTORS
ML612PND Series (1278)
Part number
1
ML612PND472MLZ
ML612PND562MLZ
ML612PND682MLZ
ML612PND822MLZ
ML612PND103MLZ
ML612PND123MLZ
ML612PND153MLZ
ML612PND183MLZ
ML612PND223MLZ
ML612PND273MLZ
ML612PND333MLZ
ML612PND393MLZ
ML612PND473MLZ
ML612PND563MLZ
ML612PND683MLZ
ML612PND823MLZ
ML612PND104MLZ
ML612PND124KLZ
ML612PND154KLZ
ML612PND184KLZ
ML612PND224KLZ
ML612PND274KLZ
ML612PND334KLZ
ML612PND394KLZ
ML612PND474KLZ
ML612PND564KLZ
ML612PND684KLZ
ML612PND824KLZ
ML612PND105KLZ
Inductance
2
(µH)
4.7 ±20%
5.6 ±20%
6.8 ±20%
8.2 ±20%
10 ±20%
±20%
±20%
±20%
±20%
±20%
±20%
±20%
±20%
±20%
±20%
±20%
±20%
±10%
±10%
±10%
±10%
±10%
±10%
±10%
±10%
±10%
±10%
±10%
±10%
DCR max
3
(Ohms)
0.040
0.046
0.048
0.055
0.058
0.062
0.072
0.080
0.096
0.120
0.150
0.161
0.180
0.190
0.210
0.280
0.300
0.410
0.460
0.510
0.690
0.900
1.02
1.12
1.53
1.69
2.29
2.55
2.87
SRF (MHz)
4
min
typ
26.0
33.0
24.0
30.0
18.0
23.0
16.0
20.0
14.0
17.0
12.0
10.0
9.6
8.8
8.0
7.6
6.8
6.0
5.6
5.2
4.0
3.6
3.4
3.3
3.2
2.7
2.5
2.3
2.2
1.8
1.6
1.4
1.1
1.0
15.0
13.0
12.0
11.0
10.0
9.5
8.5
7.5
7.0
6.5
5.0
4.5
4.3
4.1
4.0
3.4
3.1
2.9
2.7
2.2
2.0
1.7
1.4
1.3
Isat
(A)
5
Coupling Leakage
coefficient L typ
10%
20%
typ
(µH)
drop drop
0.98
0.22 13.90 15.20
0.98
0.23 13.38 14.86
0.98
0.22 12.10 13.56
0.98
0.34 10.30 11.52
0.98
0.34
8.80 10.00
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
0.99
>0.99
>0.99
>0.99
>0.99
>0.99
>0.99
0.36
0.41
0.37
0.41
0.43
0.56
0.64
0.70
0.76
0.88
0.85
0.90
1.31
1.46
0.93
1.54
1.17
4.14
1.64
0.25
2.68
2.11
2.39
4.28
8.20
7.40
6.50
6.00
5.80
5.50
4.70
3.70
3.60
3.50
3.30
2.80
2.60
2.20
2.10
1.90
1.70
1.50
1.40
1.30
1.20
1.00
0.900
0.850
9.18
8.36
7.38
6.80
6.56
6.10
5.26
4.34
4.18
4.04
3.72
3.24
2.94
2.54
2.42
2.16
1.94
1.70
1.60
1.50
1.34
1.08
1.04
0.948
30%
drop
16.36
15.74
14.20
12.20
10.66
9.74
9.03
7.86
7.26
7.02
6.52
5.60
4.60
4.50
4.32
4.02
3.46
3.16
2.70
2.58
2.28
2.10
1.84
1.70
1.60
1.46
1.22
1.18
1.05
Irms
(A)
both
one
windings
6
winding
7
3.16
4.47
2.87
4.06
2.81
3.98
2.76
3.90
2.56
3.62
2.48
2.30
2.18
1.99
1.78
1.59
1.54
1.45
1.41
1.35
1.16
1.13
0.96
0.91
0.86
0.74
0.65
0.61
0.58
0.50
0.47
0.41
0.39
0.37
3.50
3.25
3.08
2.81
2.52
2.25
2.18
2.05
2.00
1.90
1.65
1.59
1.36
1.29
1.22
1.05
0.92
0.86
0.82
0.70
0.67
0.58
0.55
0.52
12
15
18
22
27
33
39
47
56
68
82
100
120
150
180
220
270
330
390
470
560
680
820
1000
1. When ordering, please specify
testing
code:
ML612PND105KLZ
Testing: Z
= COTS
H
= Screening per Coilcraft CP-SA-10001
N
= Screening per Coilcraft CP-SA-10004
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. Typical 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
®
Specifications subject to change without notice.
Please check our website for latest information.
Document ML704-2
Revised 07/13/12
1102 Silver Lake Road
Cary IL 60013
© Coilcraft, Inc. 2012
Phone 800-981-0363
Fax 847-639-1508
E-mail cps@coilcraft.com
Web www.coilcraft-cps.com
1278 COUPLED INDUCTORS
ML612PND Series (1278)
Typical L vs Current
10000
Typical L vs Frequency
10000
1000
1000 µH
470 µH
1000
1000 µH
470 µH
Inductance (µH)
100
100 µH
47 µH
Inductance (µH)
100
100 µH
47 µH
10 µH
4.7 µH
10
10 µH
4.7 µH
10
1
0.1
1
10
100
1
Current (A)
0.01
0.1
1
10
Frequency (MHz)
Current Derating
120
110
100
90
80
70
60
50
40
30
20
10
0
-55 -40
Percent of rated Current
Isat
Irms
-20
0
20
40
60
80
100
120
140 160
Ambient temperature (°C)
25°C
®
Specifications subject to change without notice.
Please check our website for latest information.
Document ML704-3
Revised 07/13/12
1102 Silver Lake Road
Cary IL 60013
© Coilcraft, Inc. 2012
Phone 800-981-0363
Fax 847-639-1508
E-mail cps@coilcraft.com
Web www.coilcraft-cps.com
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