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Buck converter operates at fixed 1.2MHz frequency

Posted: 02 Dec 2011 ?? ?Print Version ?Bookmark and Share

Keywords:buck converter? LDO? battery-powered application?

Linear Technology Corp. has revealed a couple of 15V fixed frequency synchronous buck converters capable of delivering 300mA of continuous current to output voltages from 0.6-13.8V. The LTC3103 uses 1.8?A of quiescent current, while the LTC3104, which offers a 10mA programmable LDO output, requires 2.6?A of quiescent current. According to the company, the devices target battery-powered applications such as industrial control power, remote sensor networks, low power wireless systems and energy harvesting applications.

LTC3104

The LTC3103 and LTC3104 operate from 2.5-15V input voltage.

The LTC3103 and LTC3104 use synchronous rectification to deliver efficiencies as high as 95 percent, said Linear Tech. In addition, both devices operate from 2.5-15V input voltage. For applications that demand low noise, the devices can work in a 'forced continuous mode' where the part will operate at the 1.2MHz switching frequency. The device can also be commanded to automatically transition from fixed frequency to Burst Mode operation to achieve high efficiency over an extremely wide range of load currents, added the company.

Internal compensation, small-footprint DFN and MSOP packages and fixed 1.2MHz switching frequency enable the use of just a few tiny external components to offer very compact solution footprints, noted Linear Tech. An accurate, programmable RUN comparator offers the user flexibility in programming at what input voltage the part will be enabled. Other features include Power Good, integrated soft-start and overtemperature protection.

Pricing for LTC3103EDD and LTC3103EMSE starts at $2.45 each, for 1,000-piece quantities. Industrial grade versions, the LTC3103IDD and LTC3103IMSE, are tested and guaranteed to operate from a -40C to 125C operating junction temperature, and are priced at $2.70 each, in 1,000-piece quantities.

Pricing for the LTC3104EDE and LTC3104EMSE starts at $2.70 each, for 1,000-piece quantities. Industrial grade versions, the LTC3104IDE and LTC3104IMSE, are tested and guaranteed to operate from a -40C to 125C operating junction temperature, priced at $2.96 each, in 1,000-piece quantities.





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