Power Electronics

New Products

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PWM Controller

The IR3624 from International Rectifier 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 integrated thermal shutdown and programmable overcurrent limit protection. The IR3624 includes a 0.6-V voltage reference. For applications below 5 A, even higher density can be achieved by using one SO-8 dual n-channel HEXFET MOSFET such as the IRF8910 to replace the two stand-alone MOSFETs and further shrink the board area to within 150 mm2.

Pricing for both the IR3624MPbF and the IR3624MTRPbF is $0.85 each in 10,000-unit quantities, and are available either in tubes or tape and reel.
International Rectifier
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% reduction in profile height. In comparison to the previous generation SOD-523 package, the SOD-723 delivers a 13% footprint reduction and a 28% reduction in profile 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

The STK800 20-A and STK850 30-A power MOSFETs are the first power devices from STMicroelectronics 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.

The STK800's and STK850's leadframe and plastic encapsulation are similar to those used for most standard power MOSFET packages, ensuring good die protection and easy handling in manufacturing. The devices are manufactured using ST's STripFET technology to achieve very low on-resistance and losses while using less silicon area. Typical RDS(ON) of the STK800 is 6 mΩ and of the STK850 is 2.9 mΩ, 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 Technology's LT3844 is a 4-V to 60-V input dc-dc controller with adjustable 100-kHz to 500-kHz switching frequency. For noise-sensitive 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 topologies 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 efficiency 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 Module's PKM4402NG is an intermediate bus converter (IBC) providing up to 660 W in a quarter-brick package. The resulting power density is 475 W/in3. The IBC packs two quarter bricks into the space of one, providing twice the power.

The 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 completely n+1 parallelable without external circuitry. The devices have figures up to 97% efficiency 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-output 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-rectifier topology with the latest components and proven SMT-on-pc board construction, the UWR 7-15W series gives highly reliable and highly efficient (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
Mansfield, Mass.

www.cd4power.com

Resistor Arrays

Stackpole Electronics has expanded its RAV16-4D series of chip resistor arrays to include 0.5% and 0.1% tolerances. The RAV16-4D series is an isolated resistor 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 Ω to 1 MΩ, though the value range is limited for tighter tolerances. Tolerances of 1% and 0.5% are available in E24 values from 10 Ω to 330 kΩ, and 0.1% tolerance is available in E24 values from 100 Ω to 33 kΩ. 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

Stepdown Converter

Advanced Analogic Technologies' AAT1121 stepdown converter offers 250-mA output current at up to 96% efficiency.

The AAT1121 operates over a 2.7-V to 5.5-V input range with an output as low as 0.6 V. With efficiency 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 amplifier with internal compensation 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

LEM's Sentinel is a comprehensive battery-monitoring sensor, designed for standby batteries. The sensor measures voltage and impedance per cell, and offers 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 lifetime 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 Austriamicrosystems is an ultralow dropout regulator optimized to deliver improved operating times in battery-powered portable equipment. 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 extraordinarily 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 fulfills the noise requirements for mobile phone applications.

The AS13985 device is available in a 1-mm × 1.4-mm five bumps WL-CSP, which is 15% of the size of a standard SOT-23 package.
Austriamicrosystems
Raleigh, N.C.

www.austriamicrosystems.com

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