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Step-down regulator touts 95% efficiency

Posted: 30 Jan 2009 ?? ?Print Version ?Bookmark and Share

Keywords:buck regulator? efficiency high? frequency constant?

Linear Technology Corp. has released the LTC3603 high efficiency, 3MHz synchronous buck regulator that uses a constant frequency, current mode architecture.

The device can deliver up to 2.5A of continuous output current at output voltages as low as 0.6V from a 4mm x 4mm QFN or a thermally enhanced MSOP-16 package. The LTC3603 operates from an input voltage of 4.5- to 15V, making it suitable for dual cell Li-ion applications as well as 12V fixed rail systems. Its switching frequency is user programmable from 300kHz to 3MHz, enabling the use of tiny low cost capacitors and inductors.

The LTC3603 uses internal switches with RDS(ON) of only 45m? and 85m? to deliver efficiencies as high as 95 percent. It is capable of low dropout 99 percent duty cycle operation to allow output voltages very close to VIN. No load quiescent current is only 75?A and less than 1?A in shutdown. An adjustable burst mode clamp can be programmed to maximize light load efficiency, making it well-suited for applications that demand maximum battery run-time. For applications that require the lowest noise possible, the LTC3603 can be configured to run in forced continuous mode reducing noise and potential RF interference. Additional features include a Power Good voltage monitor, external synchronization capability and thermal protection.

The LTC3603EUF is available in a 4mm x 4mm QFN-16, and the LTC3603MSE is offered in a 16-lead, thermally enhanced MSOP package. Pricing for both package options starts at $3.80 each in 1,000-piece quantities. Industrial grade versions, the LTC3603IUF and LTC3603IMSE, are guaranteed to operate over the -40C to 125C operating junction temperature range and are priced at $4.47 each in 1,000-piece quantities. All versions are available from stock.

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