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Buck regulator enables user-programmable frequency

Posted: 10 May 2010     Print Version  Bookmark and Share

Keywords:buck regulator  frequency  DDR memory 

Linear Technology debuts the LTC3615, a 4MHz synchronous buck regulator that operates from an input voltage of 2.25V to 5.5V, making it suitable for single-cell Li-ion applications as well as 3.3V and 5V intermediate bus systems.

Low resistance internal switches enable the LTC3615 to deliver up to 3A of continuous output current from each channel while its low dropout operation provides an output voltage ranging from 0.6V to just millivolts below VIN. The LTC3615 incorporates a constant frequency, current-mode architecture.

Its switching frequency is user programmable from 400kHz to 4MHz, enabling the use of tiny, low cost capacitors and inductors. The combination of its fast switching capability and the very small 4mm x 4mm QFN-24, or thermally enhanced TSSOP-24 package, offer a highly compact solution footprint for applications requiring dual outputs up to 3A.

The LTC3615 uses internal switches with RDS(ON) of only 55mΩ and 75mΩ to deliver efficiencies up to 94%. Burst Mode operation reduces no-load quiescent current to only 130µA, maximising both light-load efficiency and run time in battery-powered applications. An adjustable Burst Mode clamp enables designers to optimise light load efficiency. For applications requiring the lowest possible noise, the LTC3615 can be configured to run in either pulse-skipping or forced continuous modes, reducing noise and potential RF interference. Programmable switching slew rates further reduce potential noise concerns. Selectable 0°, 90° or 180° of phase shift between its two channels minimise input current ripple as well as output voltage ripple. The LTC3615 offers inputs for tracking capability as well as a DDR memory mode in which the device can source/sink ±1.5A. Additional features include optional active voltage positioning a Power Good voltage monitor, external synchronisation capability and thermal protection.

The LTC3615EUF is available in a 4mm x 4mm QFN-24 and the LTC3615EFE is in a TSSOP-24E with exposed pad. Pricing starts at Rs.182.40 and Rs.189.33 ($3.95 and $4.10) each, respectively in 1,000-piece quantities. Industrial grade versions, the LTC3615IUF and LTC3615IFE, are guaranteed to meet specifications over the -40°C to 125°C operating junction temperature range and are priced at Rs.214.72 and Rs.222.57 ($4.65 and $4.82) each, respectively in 1,000-piece quantities.

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