Gapped SMD beads for power inductors
Introduction
Traditional power supply architectures
for PC’s are facing problems with the
latest generation of integrated circuits.
Lower voltages and higher currents
lead to increasing losses in supply lines
and sensitivity to interference. On top
of this, fast microprocessors introduce
high frequency transients which are
difficult to regulate with a voltage
regulator module (VRM) from a distant
main supply.
The fundamental solution utilizes an
intermediate voltage and distributed
M
point of load (POL) converters. These
+
are small dc/dc converters, placed
close to the load on the PCB.
Vi
FERROXCUBE now introduces gapped
D
SMD beads, perfectly suitable for the
POL concept. They are small inductors
−
typically meant to serve as output
inductor in buck / boost stages and
Buck or down converter
feature the state of the art power
material 3C96. Depending on relative
ripple current, switching frequencies
up to 1 MHz are possible to realize
compact geometries. Saturation rated
current goes up to 20 A and the dc
resistance is less than 1 mΩ.
These gapped beads are available in 2
sizes (1812 and 3512), packed in tape
on reel and they are SMD mountable.
Furthermore, they are lead-free and
fully comply with the RoHS regulations
on hazardous substances.
L
+
Features
•
Very suitable for POL converter
concept.
•
High switching frequency, up to 1
MHz.
•
High current rating, up to 20 A.
•
Low dc resistance, less than 1 mΩ.
•
Small size (1812 and 3512).
•
SMD mountable.
•
Lead-free / RoHS-compliant.
current flow
mosfet conducting
C
V
o
−
mosfet cut-off
Technical capabilities
General data
ITEM
strip
material
Solderability
Taping
method
SPECIFICATION
copper (Cu), tin (Sn) plated
Pb
see website for lead-free info
IEC 60068-2-58, part 2, test Ta,
method 1
IEC 60286-3, EIA 481-1 and EIA 481-
2
Parameters and type numbers
GRADE
3C96
50
±
20 %
75
±
20 %
3C96
100
±
20 %
150
±
20 %
L at 1 MHz (nH)
I
max(1)
(A) TYPE NUMBER
20
15
20
20
BDS3/3/4.6-3C96-A50
BDS3/3/4.6-3C96-A75
BDS4.6/3/8.9-3C96-A100
BDS4.6/3/8.9-3C96-A150
Note
1. Imax is the saturation rated current.
2. DC resistance
<
0.6 mΩ.
3. DC resistance
<
1.0 mΩ.
BDS 3/3/4.6 ; mass
≈
0.15 g
(2)
BDS 4.6/3/8.9 ; mass
≈
0.5 g
(3)
SMD bead BDS3/3/4.6
4.6
±
0.3
1.2
min
1.1
min
SMD bead BDS4.6/3/8.9
3.05
±
0.15
8.9
±
0.35
1.27
± 0.07
5 min
1.2
min
3
max
4.6
±
0.3
1.27
±
0.07
3
max
0.2
±
0.015
0.2
±
0.015
Advantages of the material 3C96 for power inductors
3C96 - Material Characteristics
CONDITIONS
µ
i
µ
a
B
P
v
25 ºC,
≤
10 kHz, 0.25 mT
100 ºC, 25 kHz, 200 mT
25 ºC, 10 kHz, 1200 A/m
100 ºC, 10 kHz, 1200 A/m
100 ºC, 100 kHz, 100 mT
100 ºC, 100 kHz, 200 mT
100 ºC, 500 kHz, 50 mT
DC, 25 ºC
VALUE
2000
±
20 %
≈
5500
≈
500
≈
440
≈
40
≈
300
≈
250
≈
5
≥
240
≈
4800
mT
kW/m
3
UNIT
Our lowest loss general power
material 3C96 is an excellent choice to
use in high-frequency output inductors.
With a small ripple only, it can work at
much higher switching frequency then
it would as a transformer material,
preserving its higher saturation over
real high-frequency transformer
materials. The main characteristics are
given in the table, but for complete
graphical information, see our
handbook or look on the website.
ρ
T
c
density
Ωm
ºC
kg/m
3
51mcu
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