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Small 3MHz step-down regulator delivers 2.5A

Posted: 14 Mar 2008 ?? ?Print Version ?Bookmark and Share

Keywords:synchronous buck regulator? Li-ion? internal switches?

Linear Technology has rolled the LTC3602, a high efficiency, 3MHz synchronous buck regulator which 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 TSSOP-16) package. It operates from an input voltage of 4.5V to 10V, making it suitable for dual-cell Li-ion applications, as well as general purpose fixed rail systems. Its switching frequency is user programmable from 300kHz to 3MHz, enabling the utilization of tiny low cost capacitors and inductors.

The LTC3602 uses internal switches with RDS(ON) of only 65m and 90m to deliver efficiencies as high as 95 percent. It also utilizes 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, making it suitable for applications that demand maximum battery runtime. For applications that require the lowest noise possible, the LTC3602 can be configured to run in forced continuous operation reducing noise and potential RF interference. Additional features include a Power Good voltage monitor, external synchronization capability and thermal protection.

The LTC3602EUF is available in a 4mm x 4mm QFN-20, and the LTC3602EFE is offered in a 16-lead, thermally enhanced TSSOP package. Pricing starts at $4 and $4.10 each, respectively, in 1,000-piece quantities. Industrial grade versions, the LTC3602IUF and LTC3602IFE are tested and guaranteed to operate from a -40C to 125C operating junction temperature and are priced at $4.70 and $4.80, respectively, in 1,000-piece quantities. All versions are available from stock.

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