New Coilcraft power inductors
11 May 2012
Circuit designers usually try to use capacitors
rather than inductors in their circuits because of their smaller size, reduced
interference effects, and ease of manufacture.
Coilcraft, Inc. has introduced a type of coil design that has made it
easier to make use of coils in circuits where an inductance would work
better than capacitance, such as oscillators, tuned circuits, and resonant
Coilcraft’s new PFL family of coils is especially
designed for applications that require ultra-small inductors that can still
handle significant current levels.
The PFL series comes in a wide assortment of
footprints that would fit in a variety of applications. The new PFL4514 and
PFL4517 are the latest additions to the PFL line of miniature power inductors.
These low-profile inductors feature a magnetic shield, which reduces the
effects of magnetic coupling between components, and allows for tighter
component spacing without electromagnetic interference. The unique PFL design
provides the same performance as found in the larger standard-sized inductors,
so circuit designers can now increase board density at a low cost without
sacrificing any efficiency.
The PFL4514 and PFL4517 are wirewound
surface-mount inductors that feature very low profiles.
The PFL4514 Series
Shielded Power Inductor requires only 16 mm2 of board space and is 1.4 mm high.
The 4.2 A current handling capability compares to much larger inductors. The inductance
values of the PFL4514 Series range from 1.0 µH to 22 µH and feature an
operating temperature range of -40 to +125°C. The DC resistance of the PFL4514
is relatively low, as low as 80 milli-ohms, making it more suitable for
The PFL4517 Series features and even lower DC
resistance, which can be as low as 40 milli-ohms. Inductance values ranging
from 0.68 µH to 10 µH are offered for the PFL4517. The PFL4517 is taller than
the PFL4514 by 0.3 mm, and is designed for higher current levels up to 6.5A.
These low-profile, magnetically shielded
inductors share a common footprint for design and prototyping flexibility.
These devices have a composite-core construction with relatively heavy gauge
windings to provide the high current handling capability and low DC resistance.
The parts are halogen-free and RoHS-compliant, with matte tin over nickel
terminations that are compatible with 260°C processing.
Coilcraft offers free evaluation samples on its
website to qualifying designers, or a combined Designers Kit C451 can be
purchased, which contains three samples of both the PFL4514 and PFL4517 in a
range of values.