nology May 2006

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New Products
PWM Controller
The IR3624 from Interna-
tional Recti er is a 600-kHz
single-phase synchronous
buck PWM controller IC
designed for high-density,
10-A nonisolated point-of-
load (POL) regulators. The
600-kHz switching frequency
enables the use of a reduced
footprint inductor and fewer
output capacitors, saving
board area.
For system robustness,
the IR3624 features inte-
grated thermal shutdown
and programmable overcur-
rent limit protection. The
IR3624 includes a 0.6-V volt-
age reference. For applica-
tions below 5 A, even higher
density can be achieved by
using one SO-8 dual n-chan-
nel HEXFET MOSFET such
as the IRF8910 to replace the
two stand-alone MOSFETs
and further shrink the board
area to within 150 mm
2
.
Pricing for both the
I R 3 6 2 4 M P b F a n d t h e
IR3624MTRPbF is $0.85 each
in 10,000-unit quantities, and
are available either in tubes or
tape and reel.
International Recti er
El Segundo, Calif.
www.irf.com
SOD-723 Package Diodes
ON Semiconductor has
developed three Schottky
and three ESD diodes in
a 1.4-mm 0.6-mm
0.5-mm SOD-723 package.
Compared to the SOD-
323 package, the SOD-723
offers a 73% reduction in
footprint and a 50% reduc-
tion in profile height. In
comparison to the previous
generation SOD-523 pack-
age, the SOD-723 delivers
a 13% footprint reduction
and a 28% reduction in
pro le height.
The SOD-723 package
devices are priced between
$0.023 and $0.035 per unit in
quantities of 10,000 units.
ON Semiconductor
Phoenix
www.onsemi.com
Power MOSFETs
T h e S T K 8 0 0 2 0 - A
and STK850 30-A power
MOSFETs are the rst power
devices from STMicroelec-
tronics to be assembled in
the metal-topped PolarPAK
package. The devices occupy
the same 5-mm 6-mm
board area as a standard
SO-8 package, and with an
even lower profile of just
0.8 mm as a result of both top
and bottom heat-dissipation
paths.
T h e S T K 8 0 0 s a n d
STK850s leadframe and
plastic encapsulation are
similar to those used for most
standard power MOSFET
packages, ensuring good die
protection and easy han-
dling in manufacturing.
The devices are manufac-
tured using STs STripFET
technology to achieve very
low on-resistance and losses
while using less silicon area.
Typical R
DS(ON)
of the STK800
is 6 m and of the STK850 is
2.9 m, at 10 V.
The STK800 is priced at
$1.20 each and the STK850
at $1.60 each in quantities
of 1000.
STMicroelectronics
Geneva, Switzerland
www.stm.com
DC-DC Controller
Linear Technologys LT3844
is a 4-V to 60-V input dc-
dc controller with adjustable
100-kHz to 500-kHz switch-
ing frequency. For noise-sen-
sitive applications, the LT3844
can be synchronized to an
external clock from 100 kHz
to 600 kHz. It also can be
used in several dc-dc to-
pologies such as stepdown,
stepup, inverting and SEPIC
(buck-boost) converters. In
addition, the output voltage
can be adjusted over a wide
range from 1.23 V to 36 V.
The LT3844 is a current-
mode controller and drives
an n-channel MOSFET. It
maintains high ef ciency at
light loads with its burst-
mode operation and 120-µA
quiescent current.
The LT3844 is offered in
a 16-pin thermally enhanced
TSSOP. Pricing starts at $3.10
each for 1000 pieces.
Linear Technology
Milpitas, Calif.
www.linear.com
IBC Bricks
Ericson Power Modules
PKM4402NG is an interme-
diate bus converter (IBC)
providing up to 660 W in a
quarter-brick package. The
resulting power density is
475 W/in
3
. The IBC packs
two quarter bricks into the
space of one, providing
twice the power.
T he PKM4402NG is
optimized for use as an
IBC by customers using a
nonbattery backup, nominal
48-V input system. With a
38-V to 55-V input range,
the PKM4402NG is also com- Power Electronics Technology May 2006

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58
New Products
pletely n+1 parallelable without external
circuitry. The devices have gures up
to 97% ef ciency and 63 A, at all input
voltages. In OEM quantities of 1000
pieces, the PKM4402NG is priced at
$60.
Ericson
Willoughby, Ohio
www.ericson.com
DC-DC Converters
C&D Technologies has added low-
output voltage models to its UWR
7-15W series of high-density, single-out-
put isolated dc-dc converters. The models
provide output current at voltages below
2 V in a standard 1-in. 2-in. package.
Available with output voltages of
1.2 V, 1.5 V and 1.8 V, the devices deliver
a continuous output current of up to 6 A.
Input voltage ranges are available in 9 V
to 18 V; 18 V to 36V; and 36 V to 75 V.
By combining a high-frequency,
synchronous-recti er topology with the
latest components and proven SMT-on-
pc board construction, the UWR 7-15W
series gives highly reliable and highly
ef cient (up to 88%) performance.
The newly added dc-dc converters are
fully isolated (1500 Vdc) with numerous
protection features that help reduce the
need for additional external circuitry.
Packaged in a low-cost, lightweight
UL94V-0-rated plastic package, the UWR
7-15W series achieves EMC compliance
through low-noise design rather than
costly metal shielding solutions. Volume
pricing is in the range of $35 each.
C&D Technologies
Mans eld, Mass.
www.cd4power.com
Resistor Arrays
Stackpole Electronics has expanded
its RAV16-4D series of chip resistor ar-
rays to include 0.5% and 0.1% tolerances.
The RAV16-4D series is an isolated resis-
tor network consisting of four 0603-size
resistors in a single 1206-size package.
The RAV16-4D series is offered in
standard E24 values from 10 to 1 M,
though the value range is limited for
tighter tolerances. Tolerances of 1% and
0.5% are available in E24 values from
10 to 330 k, and 0.1% tolerance is
available in E24 values from 100 to
33 k. Custom values may be available
upon request. It has an operating voltage
of 75 V and a power rating of 63 mW
per element.
Standard packaging for the RAV16-
4D series is 5000 pieces per reel, with
typical pricing from $5 per thousand
for 5% tolerance to $0.25 each for 0.1%
tolerance.
Stackpole Electronics
Raleigh, N.C.
www.seielect.com Power Electronics Technology May 2006

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New Products
Stepdown Converter
Advanced Analogic Technologies
AAT1121 stepdown converter offers
250-mA output current at up to 96%
ef ciency.
The AAT1121 operates over a 2.7-V to
5.5-V input range with an output as low
as 0.6 V. With ef ciency as high as 96%,
the AAT1121 maintains a low 30-µA
quiescent current. Switching frequency
for the device is 1.5 MHz. A high dc-gain
error ampli er with internal compensa-
tion controls the output and provides
excellent transient response and load
regulation.
The AAT1121 is available in an 8-pin,
2-mm 2-mm 0.85-mm TDFN
package. The device sells for $0.76 in
1000-piece quantities.
AnalogicTech
Sunnyvale, Calif.
www.analogictech.com
Battery-Monitoring Sensor
LEMs Sentinel is a comprehensive
battery-monitoring sensor, designed for
standby batteries. The sensor measures
voltage and impedance per cell, and of-
fers the ability to monitor the internal
temperature of individual cells.
The LEM Sentinel sensors feature a
custom intelligent system-on-chip device
that processes the signal and interfaces to
the digital S-Bus control bus. Monitoring
voltage, current and impedance allows
users to accurately predict which cells
are likely to fail. Monitoring temperature
allows engineers to ensure that the life-
time of the batteries is maximized, as well
as that thermal runaway situations can be
detected and corrected.
LEM also offers interface module kits,
a low-cost, stand-alone monitor and a
pc board that can be integrated into
OEM equipment. PC-based software
that allows for the analysis of readings
is available as source code for use in
battery-monitoring systems.
LEM
Milwaukee, Wis.
www.lem.com
Chip-Scale LDO
The AS13985 from Austriamicrosys-
tems is an ultralow dropout regulator
optimized to deliver improved operating
times in battery-powered portable equip-
ment. The devices are designed to extend
the talk and standby time of mobile cell
phones as a result of its extremely low
dropout voltage (LDO).
The AS13985 LDO regulator is sold
in a miniature wafer-level chip-scale
package (WL-CSP), which means that
the silicon itself is placed directly on the
pc board. The device features extraor-
dinarily low noise of only 30 µVrms
between 10 Hz and 100 kHz. This allows
the use of a small and less expensive 1-µF
ceramic output capacitor. With a supply
voltage rejection performance of 60 dB at
1 kHz and 55 dB at 10 kHz, the AS13985
perfectly ful lls the noise requirements
for mobile phone applications.
The AS13985 device is available in a
1-mm 1.4-mm ve bumps WL-CSP,
which is 15% of the size of a standard
SO