Power Electronics

New Products

Synchronous Buck Converter

The FAN5350 from Fairchild Semiconductor is a 3-MHz, 600-mA dc-dc synchronous buck converter. At moderate and light loads, the converter switches to PFM operation, achieving a quiescent current of 16 uA typ. The device is designed to power DSP-core processors, application processors and I/O interfaces. Inductors can be 1 µH. Package options include both 1.00-mm × 1.37-mm WLCSP and 3-mm × 3-mm MLP packages. Efficiency exceeds 90% for both PFM and PWM modes.

Pricing starts $0.80 in quantities of 1000 pieces.
Fairchild Semiconductor
San Jose, Calif.


PWM Motor Controller

Performance Motion Devices' MC73110 motor control IC with 40-kHz pulse-width modulated (PWM) waveform generation is a single-axis IC that provides advanced fully digital velocity and torque control of brushless dc motors. Using the MC73110, only a MOSFET or IGBT triple-half-bridge is needed to create a complete intelligent motor controller. The MC73110 operates in one of three modes: internal velocity profile mode, velocity mode with an external command signal, and torque mode with an external command signal.

The MC73110 is packaged in a 64-pin PQFP, and operates from 3.3 V. Prices start at $18 in OEM quantities.
Performance Motion Devices
Lincoln, Mass.


Linear Li-Ion Charger

Summit Microelectronics' SMB139 is a single-cell Li-ion and Li-polymer battery charger. The device's battery-charging profile can be configured to adapt to new system designs and battery types. The device comprises a highly integrated 210-mA linear charger that uses a fully programmable algorithm for single-cell Li-ion and Li-polymer cells. The SMB139 operates from a +4.35 V to +6.5 V input, making it suitable for either USB or ac adapter power sources. The device will tolerate +10-V inputs without damage.

Available now in a 1.3-mm × 2.1-mm 15-ball CSP, pricing is $0.85 each in quantities of 10,000 units.
Summit Microelectronics
Sunnyvale, Calif.


Dual-Ouput Digital Controller

Primarion's dual-output, four-phase PX7542 with 100-ps PWM resolution is a member of the Primarion Di-POL digital power-conversion and power-management family of ICs. The device targets synchronous dc-dc telecom converters, compliant with PMBus 1.1 specifications. The control function handles both DCR and RDS(ON) current-sense topologies. The output-voltage range is 0.5 V to 8 V. The PX7542 is driven by a single +5-V supply and operates from 150 kHz to 1 MHz. Precise current sharing enables multiphase operation. The PX7542 maintains accuracy through internal calibrations.

Now available for general sampling, Primarion's PX7542 is housed in a 6-mm × 6-mm 40-lead QFN package.
Torrance, Calif.


Dual-Channel Synchronous Converter

Linear Technology's LTC3522 is a dual-channel 1-MHz synchronous converter. One channel uses a synchronous buck-boost topology that can deliver up to 400 mA of continuous output current with inputs above, equal to or below the output. The second channel is a synchronous buck regulator that can continuously deliver 200 mA at voltages as low as 0.6 V. This combination is ideal for powering applications, such as DSPs and microcontrollers, that require both a 3.3-V I/O rail and a 0.6-V to 1.8-V rail for the core voltage.

The LTC3522EUD is available in a 16-lead QFN package. Pricing is $2.50 each for 1000-piece quantities.
Linear Technology
Milpitas, Calif.


Multilayer Ceramic Capacitors

Vishay Intertechnology's VJ series of surface-mount open-mode-design multilayer ceramic capacitors (MLCCs) are available with polymer terminations to prevent cracking caused by pc board flexing. Breakdown voltage ranges from 50 Vdc to 3000 Vdc. The devices offer a wide capacitance range of 100 pF to 1.8 µF (with X7R dielectric) and 10 pF to 4700 pF (with C0G dielectric), with high reliability and thermal shock performance. Case sizes range from 0805 to 2225.

Samples and production quantities are currently available. Pricing for K tolerance 0805 case size parts begins at $0.0675 in quantities of 1000 pieces.
Vishay Intertechnology
Malvern, Penn.


AC-DC Power Modules

Synergistic Technology Solutions' BlueCube compact board-mount ac-dc converters provide regulated and fault-protected power up to 5 W. The LX3i (3 W) and LX5i (5 W) units are a self-contained drop-in ac-dc solution. All BlueCube modules operate over the universal input voltage and offer outputs of 5 Vdc, 9 Vdc, 12 Vdc, 15 Vdc or 24 Vdc. They meet worldwide energy-efficiency specifications, including Energy Star and California's CEC standard for external power supplies. The modules are fully potted and are completely fault-protected. The units are UL/CSA-recognized and FCC-certified for EMI.

Pricing for the LX3i and LX5i modules is $4.28 and $4.93 each, respectively, for 10,000 pieces.
Synergistic Technology Solutions
Vernon Hills, Ill.


Solid-State Relays

Crydom's line of standard and custom pc-board mount power solid-state relays offer ratings from 1 A to 25 A (forced air) at line voltages up to 660 Vac. This makes them ideal for commercial and industrial switching applications. Their compact design is also well suited for high-density pc-board applications. Life expectancy for these solid-state relays is more than 50 times that of electromechanical relays. Versions are available with either a zero-crossing (resistive loads) or random turn-on (inductive/phase-control loads) output.
San Diego


Thermal Monitoring System

QHi Group's Exertherm continuous thermal monitoring system will be supplied with lifetime calibration and a lifetime warranty. The system consists of infrared sensors, which are small plastic-bodied low-cost devices that can be placed inside electrical enclosures. Requiring no external power source, they work just like a standard thermocouple but are non-contact, enabling 24/7 thermal monitoring of mission-critical equipment. Originally designed for electrical inspection, the Exertherm system can be used to monitor mechanical equipment, using either non-contact IR sensors or a specifically designed range of thermocouples.
QHi Group
Herts, England


Quarter-Brick DC-DC Converter

C&D Technologies' UQQ family of converters features an input voltage of 9 V to 36 V. The units supply up to 100 W. Available models are 3.3-V/25-A, 5-V/20-A, 12-V/8-A, 15-V/7-A and 24-V/4-A, with a basic-grade I/O isolation voltage of 2250 V. With an overall height of 0.43 in., the UQQs can be installed on pc boards with half-inch card spacing. The UQQ's planar magnetics, combined with multilayer heavy-copper pc boards and synchronous rectifier topology, yield efficiencies up to 91%. An optional baseplate maximizes heat transfer to an external mounting surface, giving up to +105°C full-power operation.

Calculated MTBF figures exceed 5 million hours. Unit pricing for 100 units begins at $86.
C&D Technologies
Mansfield, Mass.


Brushless DC Motor

A compact high-performance 8-pole brushless dc motor from Magmotor is suited for automation applications in which high torque-to-weight ratios and efficiency are important. The motor is capable of 20% more torque than a standard 4-pole servo-motor configuration, making it possible to solve demanding applications that may currently require more expensive NEMA 34 motors.

The design produces a continuous torque of up to 230 oz-in, and a peak torque of 690 oz-in. A variety of electrical and mechanical options are available, including an enclosed encoder. Custom mounting configurations and winding configurations are also possible.
West Boylston, Mass.


DC Motor Driver

Allegro MicroSystems' A3903 low-voltage bidirectional dc motor driver supports an input-voltage range of 3.0 V to 5.5 V and output currents up to 500 mA. The output full-bridge incorporates source-side linear operation to allow a constant voltage supply across the motor coil. This regulated output minimizes motor-voltage change due to variations in voltage drop across RDS(ON) variation and battery-voltage tolerance. Logic input pins allow optional PWM of the sink drivers. The A3903 is supplied in a 2.0-mm × 2.0-mm × 0.575-mm nominal, 8-lead DFN package, with exposed thermal pad. It is priced at $0.45 in quantities of 1000.
Allegro MicroSystems
Worcester, Mass.


Schottky Barrier Diode Modules

As part of SanRex's Schottky barrier diode family, the BKR400AB10 uses metal-barrier technology to provide low forward-voltage drop, low thermal resistance and reduced leakage. The BKR400ABZ50 has an IF current of 400 A, VF of 0.52 V, avalance-energy rating of 320 mJ, and θJC of 0.1°C/W. The BKR400AB10 has an IF current of 400 A, VF of 0.68 V, avalance-energy rating of 15 mJ, and θJC of 0.2°C/W. Pricing for the BKR400AB10 series is $23.89 each for 1000 pieces.
Port Washington, N.Y.


Stackable DC-DC Controller

The TPS40180 dc-dc controller from Texas Instruments allows a system designer to stack together multiple power modules, delivering output current from 10 A to 200 A. The TPS40180 features load sharing and automatic phase balancing. The input-voltage range is 2 V to 40 V, and operation is from a 4.5-V to 15-V power source. The device converts 15-V to 0.7-V at a programmable switching frequency of 1 MHz per phase. Line and load regulation is 0.1%. The TPS40180 controller is packaged in a 4-mm × 4-mm, 24-pin QFN. Pricing is $1.95 each in quantities of 1000 units.
Texas Instruments


Digitally Controlled SMPS

Emerson Network Power's Astec NTS503 is a digitally controlled 500-W ac-dc power supply. The supplies generate a tightly regulated 12-V output. The convection-cooled model can deliver up to 16.6 A (200 W), and the forced-air version can deliver up to 41.7 A (500 W). Both versions also provide an auxiliary always-on regulated output at 5 Vdc and 2 A, as well as a 12-V output for powering fans. The power supplies feature a universal input range. The convection-cooled model is suited for 1U rack-mount chassis, while the fan-cooled version can deliver 500 W up to 50°C with 30 CFM forced air.
Emerson Network Power
St. Louis


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