New products

Mar 1, 2010 12:00 PM

DC-DC µModule Regulator

THE LTM8027 from Linear Technology Corporation is a 4-A system-in-a-package dc-dc µModule® regulator that can operate from a 60-V supply without input protection. The device fits an inductor, power switches, switching regulator, and all support components in a 2.6-g, 15- × 15- × 4.32-mm LGA plastic package.

The device can regulate an output voltage ranging from 2.5 to 24 V from an input supply of 4.5 to 60 V (65 V is the absolute maximum). The LTM8027's voltage rating suits the device for 12- and 24-V automotive and heavy equipment such as industrial robotics, 48-V telecom, as well as avionics and industrial control systems.

The voltage regulator's operating frequency is adjustable from 100 to 500 kHz with a resistor, or the device can be synchronized to an external clock to optimize efficiency for a given input-to-output voltage ratio or to prevent the device from interfering with a system's sensitive operating frequency. Because of synchronous switching of the internal MOSFETs, the LTM8027 can deliver 4 A at 12 V^OUT from 24 V_IN with 93% efficiency. The device draws only 10 µA in shutdown.

The LTM8027 is offered in temperature grades of -40° to 125°C and -55° to 125°C. 1,000-piece prices start at $16.50 each.

Linear Technology
Milipitas, CA
http://www.linear.com

Ultra-Compact LED Driver

THE LDU Series of 300- to 1,000-mA PCB mount LED drivers from XP Power measure 20.32 × 10.16 × 6.88 mm for the LDU08 300-mA model and offer a typical efficiency of 95%. Models within the series offer constant-current outputs of 300, 350, 500, 600, 700, and 1,000 mA.

The non-isolated step-down drivers can accommodate a wide range of input voltages, from 7 to 30 Vdc. Dimming options include two analog methods (voltage or resistance) or a pulse-width modulation (PWM) input signal, which has a maximum operating frequency of 1 kHz with a minimum 200-ns on/off time. When using an analog dimming method, the output-current range can be adjusted from 25% to 100% of nominal current.

The drivers offer a MTBF in excess of 5 million hours that complies with MIL-HDBK-217F reliability standards at 25°C. The LDU series suits a broad range of energy-efficient LED lighting designs, such as those used for advertising displays, traffic signs, automotive lighting, and consumer appliances.

A remote on/off control input provides the designer with the ability to control the output or sequence the start-up. Short- and open-circuit protection is also provided.

The LDU series is available from stock from Newark or direct from XP Power. The devices have a three-year warranty and are priced from $7.80 for the LDU08 300-mA unit to $13.26 for LDU24 1,000-mA unit in medium quantities.

XP Power
Sunnyvale, CA
http://www.xppower.com

Integrated Voltage Regulator

THE IR3870M SupIRBuck integrated voltage regulator from International Rectifier is designed for applications such as notebook and desktop computers, game consoles, consumer electronics applications such as set-top boxes, and general-purpose POL dc-dc converters. The regulator features a hysteretic constant on-time modulator with adaptive dead-time control and on-state resistance, R_DS(on), current sensing to achieve maximum efficiency for notebooks.

The IR3870M can deliver up to 10 A in environments with up to 60°C ambient temperatures, and the device features diode emulation for improved light-load efficiency. The device also offers a charge pump output (CPO) option for enhancing the MOSFET gate drive to deliver the highest efficiency at medium- to full-load conditions. In addition, the IR3870M has a wide input voltage range of 3 to 26 V and can be programmed for output voltages of 0.5 to 12 V by an external resistor divider network.

The IR3870M also features pre-bias start-up, very precise 0.5-V reference, overvoltage and undervoltage shut-down, power good output, and enable input with voltage monitoring capability. The device also offers constant on-time control, programmable switching frequency, soft start, and overcurrent protection.

The SupIRBuck family of single-output integrated POL dc-dc voltage regulators integrates the company's high-performance control ICs, optimized with benchmark HEXFET® MOSFETs in a 5- × 6- × 0.9-mm power QFN package. With a unique, scalable common footprint, SupIRBuck provides an easy-to-implement, flexible, compact, cost-effective, high-performance POL solution.

The controller IC used in the IR3870M is also available as a stand-alone device, the IR3710M, to allow designers who use the IR3870 for lighter loads to easily scale up to loads as high as 24 A by using the IC with a pair of external IR MOSFETs. Both the IR3870M and IR3710M are Pb-free and RoHS compliant.

International Rectifier
El Segundo, CA
http://www.irf.com

SMT Spring-Loaded Connectors

OFFERED AS discrete contacts, the 0910-0 and 0910-1 through -4 SMT spring-loaded connectors (SLCs) from Mill-Max are specifically designed for production tape and reel assembly. Part 0967 is a horizontal-mount SMT SLC designed for low-profile board-to-board interconnections.

The SLCs feature a large base for either increased PC board stability or assembly in non-PC board applications, such as a face plate. These part families offer a range of application heights from 3.48 to 10.92 mm.

Mill-Max
Oyster Bay, NY
http://www.mill-max.com

Low-profile Coolers

THE NTELLIJET™ Series of low-profile coolers from Jaro Thermal are low-acoustic coolers that use rapid-fire pulses of turbulent air — produced by an oscillating diaphragm working between 50 and 200 hz — to cool heat sinks and surrounding components. The coolers represent a unique concept for thermal cooling.

In addition to ultra-high reliability and a low profile (max 15-mm height), the coolers eliminate mechanical wear, dirt, and dust clogging. The coolers are also shock- and vibration-resistant, and provide 100,000 hours at 60°C. The NtelliJet suits applications that require focused cooling for specific chips or coverage areas.

Created using the company's patented actuator technology and proprietary fluidic packaging expertise, the vortex-dominated NtelliJet flow enhances small-scale mixing near heated surfaces to yield more effective heat transfer at low-volume flow rates compared to conventional air movers. System-wide heat removal takes advantage of the ejector effect inherent to high-momentum jet flows. As it operates, the NtelliJet module expels high-momentum pulses of air that pull nearby ambient air behind it in its wake. Lead time for production orders is 6 to 8 weeks ARO.

Jaro Thermal
Boca Raton, FL
http://www.jarothermal.com

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