Power Electronics

New Products

PWM Controllers

STMicroelectronics' family of flexible and high-performance pulse-width modulation (PWM) controllers are intended for the motherboard and point-of-load markets. Two of the chips, the L6726A and L6727, are low-cost single-phase PWM controllers with embedded high-current drivers, enabling the easy creation of general-purpose dc-dc stepdown converters for a broad range of applications.

The L6728 and L6728A add to the simpler devices the characteristics required by the high-end motherboard market, including ±0.8% voltage accuracy over line and temperature variations, and a PowerGOOD output to provide real-time information on output-voltage status.

Housed in an SO-8, the L6726A and L6727 are priced at $0.50 each in quantities of 1000. The L6728 and L6728A are packaged in a 3-mm × 3-mm DFN.
Lexington, Mass.


Permanent Magnet Materials

Ansoft has added a library of permanent magnet materials from Shin-Etsu Magnetics for its Maxwell electromagnetic field simulation software. Maxwell users now have access to the latest materials from Shin-Etsu to use directly within their simulations of new or existing designs.

Ansoft's library contains more than 31 high-performance permanent magnets defined at different operating temperatures using rare earth elements that can be downloaded by Ansoft customers and are ready for use within Maxwell.
Pittsburgh, Pa.


LED/OLED Display Drivers

National Semiconductor has added three power management products for driving light-emitting diodes (LEDs) and powering organic LED (OLED) displays to its PowerWise family. The LM2755 LED driver, the LM2757 inductorless switched-capacitor boost regulator and the LM4510 high-voltage boost regulator extend battery life and enable next-generation visual effects in portable media devices.

The LM2755 enables multizone backlighting for three independent RGB or white-indicator LEDs controlled by programmable pattern generators. The LM2757 requires four ceramic capacitors for a total solution size of less than 12 mm2. With high output current and pin-selectable output voltages, the LM2757 is suited for peripheral lighting features, such as keypad lighting, and also can be used to power USB on-the-go peripherals.

The LM4510 is a synchronous high-voltage boost regulator that supports OLED displays. The LM4510 features up to 85% efficiency for longer battery life and is offered in a small LLP package.

The LM2755 and LM2757, both offered in micro-SMD packages, are priced at $1.50 each in 1000-unit quantities. Housed in a 10-pin thermally enhanced LLP package, the LM4510 is priced at $1.80 each in quantities of 1000.
National Semiconductor
Santa Clara, Calif.


Zero-Recovery Rectifier

Cree's 8-A Zero Recovery rectifier significantly increases power-supply efficiency in computer servers. The CSD08060 8-A Schottky diode expands Cree's Zero Recovery product line, which includes 600-V diodes with 1-, 2-, 4-, 6-, 10- and 20-A ratings.

Compared with traditional silicon-based diodes, Cree SiC-based rectifiers can simplify power factor correction boost design; eliminate the need for snubbers; reduce power losses; produce significantly less EMI; offer faster switching speeds without reverse-recovery currents; enable streamlined circuit design, resulting in smaller board size and component counts; and allow higher power-density designs for compact power supplies for high-performance applications.
Durham, N.C.


SPICE Simulator

Intusoft's ICAP/4 8.×.11 Build 3090 SPICE-simulation tool suite for analog, mixed-signal and mixed-system design contains a host of enhancements over the former Build 2817 suite. The 11th-generation tool suite is compliant with Windows Vista and other Windows platforms, in either 32- or 64-bit operating systems.

In the modeling domain, Intusoft's free custom-modeling program added 25 new simulation devices to ICAP/4's previous release of 40 new devices. This brings the total simulation library size to more than 23,600 device models. Also, the latest Berkeley BSIM4 v4.6.1 has been added for IC design.
Gardena, Calif.


Automotive-Grade IC

The A4401 from Allegro MicroSystems is a converter control IC designed to work over the automotive battery voltage range of 7 V to 40 V and over the temperature range of -40°C to 125°C ambient. The IC is targeted primarily for use in vacuum fluorescent-display power supplies, which require multiple voltage rails. It also can be used in other automotive applications that require several regulated voltage rails.

The A4401 includes an integrated transconductance amplifier, which can be used to monitor and regulate the voltage on either one or several outputs where good cross regulation is required. Housed in an 8L SOIC, the A4401 costs $1.04 each in quantities of 1000.
Allegro MicroSystems
Worcester, Mass.


Eighth-Brick Heatsinks

Aavid Thermalloy has expanded its line of heatsinks to include eighth-brick form factors. The eighth-brick heatsinks help engineers overcome the power-density hurdle with complete off-the-shelf cooling solutions. Aavid's designs feature thin-fin geometry to improve thermal performance. Thinner fins also reduce pressure drop, thereby improving system airflow and lowering fan costs. In addition, all heatsinks are ready for mounting with interface material preapplied.

The eighth-brick heatsinks will be available in December in both length-wise and cross-wise airflow directions and in three different heights. Pricing will start at $2 each in OEM quantities of 1000.
Aavid Thermalloy
Concord, N.H.


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