Power Electronics

New Products

Time Counter

The DS1318 is a 44-bit binary, elapsed-time counter with 244-µs resolution. It combines a 32-bit seconds counter, a 12-bit subseconds counter, periodic interrupt/alarm, and programmable square-wave output in a 24-pin TSSOP package. The elapsed-time counter's 44-bit binary counter increments once every 244 µs. By using a software algorithm, the DS1318 can derive time of day, week, month and year, thereby serving as a real-time clock.
Dallas Semiconductor, Dallas
CIRCLE 301 on Reader Service Card

Controller

The LTC4411 low-loss Power Path controller controls an integrated P-channel MOSFET to create a near-ideal diode function for power switchover or load sharing. When conducting, the voltage drop across the MOSFET is as low as 28 mV — as much as 10 times less than a comparable Schottky diode. Protection features include current limiting, thermal protection and reverse-current detection for input supply protection. A logic-level input pin simplifies microcontroller interfacing, and an open-drain status pin indicates the conduction status of the LTC4411. It operates from 2.6-V to 5.5-V supplies and is housed in a SOT-23 package.
Linear Technology Corp., Milpitas, Calif.
CIRCLE 302 on Reader Service Card

Pb-Free Resistor Components

These lead-free compatible thick-film chip resistor components are for customers transitioning to lead-free circuit assembly. They feature lead-free end-terminal metallizations designed for compatibility with all available lead-free alloys and flux systems. The first group of products with lead-free terminations includes RCI-2512S, RCI-2512T, RCI-2010S and RCI-1206T, as well as RCI-0805S and RCI-0805T. Other sizes, including RCI-0201, will soon be available in lead-free configurations.
IMS, Portsmouth, Rhode Island
CIRCLE 303 on Reader Service Card

Bus Converters

Available in standard quarter-brick format and operating from a 38-Vdc to 55-Vdc input, the IBC family offers nine fixed-ratio standard models with nominal outputs from 3 Vdc to 48 Vdc (3, 4, 6, 8, 9.6, 12, 16, 24 and 48 V). By incorporating V•I Chip Bus Converters (BCMs) into the quarter-brick standard, they double the power capability of older technology IBCs for Intermediate Bus Architecture applications. They deploy either a single BCM, rated up to 300 W, or two parallel BCMs, capable of 600 W.
Vicor Corp., Andover, Mass.
CIRCLE 304 on Reader Service Card

Contacts

These contacts, for use on 0.100-in. grid, come in eight heights from 0.137 in. to 0.295 in., and are supplied in single- and double-row contact strips. The double-row 813 Series comes on 32-mm-wide carrier tape, in four positions (2×2) to 16 positions (2×8). Precision-machined piston/base and gold-plated components assure a 100,000-min. cycle life. Low-resistance, high-current contacts are rated at 2-A continuous, 3-A peak.
Mill-Max, Oyster Bay, N.Y.
CIRCLE 305 on Reader Service Card

Power-Source Selector

The MAX1538 provides power-source selection for notebook and sub-notebook computers and dual-battery portable equipment. Based on the presence of the power sources and the state of the batteries, it selects one of the two batteries or an ac adapter for power. It also enables use of an airline adapter by disabling battery charging while using the airline adapter to supply the system.
Maxim Integrated Products, Sunnyvale, Calif
CIRCLE 306 on Reader Service Card

Digital Power Supplies

The PQD Series of high-density rack-mount dc switching power supplies ranging from 3.3 kW to 10 kW features 48 models with output voltages ranging from 5 Vdc to 600 Vdc, and currents ranging from 5 Adc to 900 Adc. It offers stepless analog and digital control, and can be programmed from the front panel, or through a rear connector or RS232 communications.
Magna Electronics Inc., Boonton, N.J.
CIRCLE 307 on Reader Service Card

Power MOSFETs

This trio of 250-V n-channel TrenchFET power MOSFETs offers the lowest on-resistance available in the SO-8, PowerPAK SO-8 and D2PAK packages for this voltage rating. The Si4434DY (LITTLE FOOT SO-8), Si7434DP (PowerPAK SO-8) and SUM45N25-58 (D2PAK) are designed to serve as primary switches in dc-to-dc converters, ac-to-dc converters and inverters. The Si4434DY and Si7434DP feature a maximum on-resistance value of 155 mΩ at a 10-V gate drive and typical gate-charge value of 34 nC. The SUM45N25-58 has on-resistance on 58 mΩ, a gate-charge value of 95 nC, and a maximum junction temperature rating of 175°C.
Vishay Siliconix, Santa Clara, Calif.
CIRCLE 308 on Reader Service Card

MOSFET Driver ICs

The HIP2100 and HIP2101 high-voltage half-bridge MOSFET driver ICs now come in space-saving and thermally efficient packages. The new 8-lead exposed-pad (EP or E-pad) SOIC package offers enhanced thermal efficiency, and the 4- × 4-mm dual flat no-lead (DFN) package yields the world's smallest 100-V half-bridge MOSFET driver. Applications include telecom and datacom power supplies, avionics dc-dc converters, 2-switch forward converters and active-clamp forward converters.
Intersil Corp., Milpitas, Calif.
CIRCLE 309 on Reader Service Card

Power Conversion IC

The LinkSwitch monolithic high-voltage power conversion IC replaces nonisolated, low-current (<360 mA) resistive/capacitive dropper and linear transformer power supplies. It delivers switcher benefits — smaller size, lighter weight, superior performance and energy efficiency — at equal or lower system cost relative to older technologies. It also uses EcoSmart technology to reduce standby and no-load energy consumption.
Power Integrations, San Jose, Calif.
CIRCLE 310 on Reader Service Card

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