Electronic Design


Power Modules Offer 36- To 75-V Input Range With 87% Efficiency
The Onami 5- and 12-V power modules offer typical efficiencies of 87%. Both modules are 125-W dc-dc converters housed in open-construction SIP connector packages. Also, both offer telecom-wide input ranges from 36 to 75 V.

Offering true current-sharing capability, the Onami modules are parallel-able. The devices are small and share a vertical plug-in profile. According to the company, these power modules are suited for distributed power architecture applications such as servers, computers, data networking, wireless base stations, telecom, and test equipment.

The Onami 5-V power module will be available this month, with the 12-V version following in December. In 1000-unit quantities, the devices cost $85.00 each.

Lucent, 600 Mountain Ave., Murray Hill, NJ 07974; (800) 526-7819; www.lucent.com.

5-Bit DC-DC Converter VRM Requires Only 5-V Input
The EM5-V-20LC 5-bit dc-dc converter voltage regulator module (VRM) requires only a 5-V input. At 20 A, the output ranges from 1.3 to 3.5 V. This device meets or exceeds Intel VRM8.4 specifications. It converts the raw input of 5 V into a well-regulated voltage as required by the CPU.

Features of the device include a 5-bit digital input that selects output voltage and remote-sensing output voltage. Also, overload and short-circuit protection (auto recovery), overvoltage protection (latching), and high-efficiency synchronous rectification (SR) are provided by the VRM. A digitally controlled soft start eliminates turn-on overshoot and prevents clamping of the output if voltage is present.

With an operating-temperature range of 0°C to 70°C, the device may be used with Pentium III, Athlon Processors, and advanced microprocessor supplies. Also, the VRM features a typical output ripple of 25 mV.

For pricing and availability information, contact the company.

Powercube, 9340 Owensmouth Ave., Chatsworth, CA 91311; (818) 734-6500; fax (818) 734-6540; www.powercube.com.

Voltage Regulator Features 250-mA Output With 180-mV Dropout
The Si9182DH low-dropout regulator has a maximum continuous output current of 250 mA. The corresponding dropout voltage is 180 mV. In power-conversion designs, the regulator functions with either 2.2-µF ceramic or tantalum capacitors on the input and output.

A typical line-and-load transient response of less than 2 µs allows the device to be used with the fastest slew-rate DSPs and microcontrollers. The regulator has an input range of 2 to 6 V and is compatible with single- or multi-cell battery packs in cell phones, communicators, and portable instruments. Also, the device features an output range of 1.8 to 5 V and an out-of-regulation error flag to ensure smooth operation.

The device maintains regulation at peak currents up to 500 mA to ensure steady operation in systems that produce a high surge current upon turn-on. The device comes packaged in an 8-pin MSOP.

Available now, the device costs $0.55 each in 100,000-piece quantities.

Vishay, 63 Lincoln Hwy., Malvern, PA 19355-2120; (610) 644-1300; fax (610) 296-0657; www.siliconix.com.

85-V High-Power MOSFETs Are Made From A Single Die
Models in a series of high-power MOSFETs rated at 85 V are made from a single die. At 25°C, the IXF_80N085 is rated at 80 A and 300 W. It has an RDS(ON) of less than 9 mΩ. Also, it is available in either the TO-247 through-hole or surface-mountable TO-269 packages. The IXF_180N085 offers a 560-W power dissipation and an RDS(ON) of less than 6 mΩ.

Three package parts are available: the IXFK180N085 in the JEDEC TO-264 package, the IXFX180N085 in the PLUS247 ("hole-less" TO-247) package, and the IXFR180N085 in the isolated ISOPLUS247 package. The HiPerFET process is used to provide high ava-lanche energy capability, high current transconductance for high peak current capability, and reduced reverse recovery switching time of the body diode.

Available now, 1000-unit pricing starts at $8.85 for the IXFH80N085.

IXYS Corp., 3540 Bassett St., Santa Clara, CA 95054; (408) 982-0700; fax (408) 496-0670; www.ixys.com.

Low-Voltage Power MOSFETs Target Automotive Applications
The low-voltage HEXFET line of power MOSFETs has been extended to target under-the-hood automotive applications. The 40-V devices are made for electric power-assisted steering (EPS) applications while the 75-V models are suited for integrated starter-alternator (ISA) applications.

For ABS applications, highly efficient 55-V versions are offered. These allow the designer to use smaller-die devices in the circuit, reducing size and cost.

Available now, the cost for 10,000-piece quantities ranges from $0.79 to $3.90 each.

International Rectifier, 233 Kansas St., El Segundo, CA 90245; (310) 252-7105; www.irf.com.

Multiple-Output 3-MHz Converter Generates Voltage Up To 30 V
The LT1948 multiple-output dc-dc converter can generate voltage up to 30 V. Two independent switching regulators include a 1.1-A switch that can generate up to 30 V and a second regulator that generates 24 V at up to 10 mA for positive bias. A level-shift charge pump off the main switch accommodates negative bias voltage.

This converter offers an input range of 2.6 to 6 V and operates at a fixed frequency of 3 MHz. It comes packaged in an 8-lead MSOP. The device provides the high voltage and low-noise bias voltages required by large thin-film transistor (TFT) LCD panels. According to the company, the converter is suited for such TFT-LCD applications as notebook and desktop display panels and digital cameras.

The LT1948 costs $2.90 each in 1000-piece quantities.

Linear Technology Corp., 1630 McCarthy Blvd., Milpitas, CA 95035-7417; (800) 4-LINEAR; www.linear-tech.com.

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