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What’s New Efficient 5A buck regulator

Vishay Intertechnology has expanded its microBUCK family of integrated synchronous buck regulators with a 5A device offering programmable switching frequencies to 4MHz. The Vishay Siliconix SiP12108 features integrated high­ and low­side power MOSFETs in a 3 by 3mm QFN­16 package, providing a high­current solution in 180mm².

The new regulator provides an input

voltage range of 2.8 to 5.5V and an adjustable output voltage down to 0.6V with ±1 per cent accuracy, while a selectable power­saving mode enables

Timing devices for PCIe

Micrel has introduced the PL6020xxx and PL6070xxx families of clock generators and the SY7557xL clock distribution family for PCI­Express reference clock signals. The new products exceed the requirements of the current PCIe Gen1, Gen2 and Gen3 standards and support SST for EMI reduction.

The clock generators feature one, two,

four or eight outputs with industry­leading sub­200fs phase jitter and output­to­output skew of 50ps. The PL6070xxx supports spread spectrum technology for EMI reduction. The devices accept a fundamental crystal or reference input of 25MHz and produce output frequencies ranging from 25 to 200MHz, with 100MHz phase noise performance of ­135dBc at 10kHz offset.

The SY75576L and SY75578L clock buffers,

with four and eight outputs respectively, offer additive phase jitter of less than 150fs with sub­50ps output­to­output skew.

All devices are production released

with an industrial temperature range of ­40 to 85°C and have Green, RoHS and PFOS compliant packaging. They are offered in 6­pin SOT (1 output), 16­pin 3 by 3mm QFN (2 outputs), 24­pin 4 by 4mm QFN (4 outputs), or 44­pin 7 by 7mm QFN (8 outputs) package options.

efficiency to 95 per cent across the full range of load current. The device’s current­mode constant on­time architecture delivers ultra­fast transient response with minimum output capacitance and tight ripple regulation at very light loads.

The SiP12108 offers a full protection

feature set, including output undervoltage and overvoltage protection, thermal shutdown, input undervoltage lockout, internal soft start and a power­good indicator. An ‘A’ version of the device has the output undervoltage protection

feature disabled. The SiP12108 is footprint­compatible with Vishay's 3A SiP12107. 1W DC­DC converters

Murata Power Solutions has announced the MEF1 series of 1W regulated DC­DC converters. These tightly­regulated single output converters, rated to better than 1 per cent of nominal output voltage, are packaged in a fully encapsulated single­in­ line through­hole format occupying less than 1.17cm² footprint.

The converters are available with either

1 or 3kVDC input­to­output isolation, the latter model having an enhanced immunity to voltage transients. Output voltage options are 3.3 or 5.0VDC, with input voltages covering the popular nominal

inputs from 3.3 to 24VDC. Compared to previously available models, the MEF1 offers a 13 per cent improvement in energy efficiency. Both the 3.3VDC input and 3.3VDC output options can operate over the full industrial temperature range of ­40 to 85˚C without derating.

Certification to the internationally

recognized safety standard UL60950 is pending. With lead­times from stock to 10 weeks, pricing in OEM quantities is in the $3.00 range.


MIL­qualified toggle switches

C&K Components has developed a series of MIL­S­83731 qualified toggle switches designed for military, aerospace and other high­reliability applications. They are rated for logic level up to 5A resistive loads and 2A inductive loads for use in various applications.

The switches feature extra thick

50µin selective gold over silver contact plating and flame retardant housing material. The internal O­ring and external panel seal offer an IP67 seal for use in harsh environmental conditions including, water, dust, shock, vibration and salt spray. The RoHS­compliant and

compatible switches have epoxy sealed terminals for process compatibility. They are available with several panel and PC mounting options and multiple poles and circuits are available.­ February 2014 | 35

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