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Buck regulators tout ultrafast operation

Posted: 29 Jan 2009     Print Version  Bookmark and Share

Keywords:dual regulator  buck regulators  PWM frequency 

Micrel Inc. has announced the availability of the MIC4742 and MIC4744 dual non-synchronous PWM buck regulators operating at 2MHz and 4MHz, respectively, with a maximum load current of 2 per channel.

The ICs address a designer's need for a dual regulator solution for the 5- and 3.3V buses, as well as the need for smaller footprint and substantial cost savings.

The chips target a wide range of applications including wired and wireless broadband communication equipments, printers, HD STBs, computing peripherals and low power FPGAs—all applications where total solution cost is a critical design consideration.

The MIC4742 and MIC4744 feature ultrafast operation and a proprietary internal compensation, which allows for ultrafast transient response. Further, the high PWM frequency of operation allows the use of the smallest and most cost-effective LC components. Each channel provides up to 2A of output current, while designers can realise more than 92 per cent efficiency. The output voltage can be adjusted down to 0.6V and these devices can operate with a maximum duty cycle of 100 per cent for use in low dropout conditions.

Both regulators are housed in highly reliable exposed pad 16-pin 3mm x 3mm MLF and thermally-enhanced TSSOP-16 packages. The MIC4742 and MIC4744 are available in volume quantities, with pricing starting at Rs.114.58 ($2.29) and Rs.135.10 ($2.70) respectively, for 1,000 units.





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