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Step-down regulators offer controlled frequency

Posted: 17 Aug 2009     Print Version  Bookmark and Share

Keywords:buck regulator  Li-ion  voltage monitor 

Linear Technology Corp. has rolled out a synchronous buck regulator that incorporates a controlled frequency, current mode architecture. The 4MHz LTC3601 can deliver up to 1.5A of continuous output current at output voltages as low as 0.6V from a 3mm x 3mm QFN or a thermally enhanced MSOP-16 package. The regulator operates from an input voltage of 4V to 15V and it is suitable for dual-cell Li-ion applications and 12V intermediate bus systems. Switching frequency is user programmable from 800kHz to 4MHz, enabling the use of tiny, low-cost capacitors and inductors.

The LTC3601 uses internal switches with RDS(ON) of only 100mΩ and 130mΩ to deliver efficiencies as high as 96 per cent. Its unique control architecture enables it to achieve duty cycles as low as 5 per cent while maintaining switching frequencies as high as 2.25MHz making it suitable for high step-down ratio applications, such as 12VIN to 1.2Vout conversions. Burst Mode operation is used to maximise light load efficiency requiring only 300µA at no load, making it well-suited for applications demanding maximum battery run time. For applications that require the lowest possible noise, the LTC3601 can be configured to run in forced continuous mode, reducing noise and potential RF interference. Additional features include a Power Good voltage monitor, external synchronisation capability and thermal protection.

The LTC3601EUD is available in a 3mm x 3mm QFN-16, and the LTC3601MSE is offered in a 16-lead, thermally enhanced MSOP package. Pricing for both package options starts at Rs.112.35 ($2.30) each in 1,000-piece quantities. Industrial grade versions, the LTC3601IUD and LTC3601IMSE, are guaranteed to operate over the -40°C to 125°C operating junction temperature range and are priced at Rs.132.38 ($2.71) each in 1,000-piece quantities. All versions are available from stock.

Get related application notes and technical articles on Power Design India.

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