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1.25A step-down regulators fit battery apps

Posted: 03 Feb 2009 ?? ?Print Version ?Bookmark and Share

Keywords:step down regulator? battery application? Li-ion battery?

Linear Technology Corp. has released the LTC3565 high efficiency synchronous step-down regulator which can deliver up to 1.25A of continuous output current from a 3mm x 3mm DFN package.

Using a constant frequency of (up to 4MHz) and current mode architecture, the LTC3565 operates from an input voltage range of 2.5V to 5.5V making it ideal for single cell Li-ion, or multi-cell Alkaline/NiCad/NiMH applications. It can generate output voltages as low as 0.6V, enabling it to power the latest generation of low voltage DSPs and microcontrollers. An independent RUN pin enables simple turn-on and shutdown. Its switching frequency is user programmable from 400kHz to 4MHz, enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency bands. The combination of its 3mm x 3mm DFN-10 (or MSOP-10) package and high switching frequency keeps external inductors and capacitors small, providing a very compact, thermally efficient footprint.

In addition, the LTC3565 uses internal switches with an RDS(ON) of only 0.13? (n-channel lower FET) and 0.15? (p-channel upper FET) to deliver efficiencies as high as 95 percent. It also utilizes low dropout 100 percent duty cycle operation to allow output voltages equal to VIN, further extending battery run-time. The LTC3565 utilizes automatic low ripple ( PK-PK) burst mode operation to offer only 40?A no load quiescent. If the application is noise sensitive, the BurstMode can be disabled using a lower noise pulse-skipping mode which still offers only 330?A of quiescent current. The LTC3565 can be synchronized to an external clock throughout its entire frequency range. Other features include 2 percent output voltage accuracy and over-temperature protection.

The LTC3565EDD is available from stock in a 3mm x 3mm DFN-10, and the LTC3565EMSE is offered in a 10-lead, thermally enhanced MSOP package. Pricing starts at $2 each in 1,000-piece quantities. Industrial grade versions, the LTC3565IDD and LTC3565IMSE are tested and guaranteed to operate from a -40C to 125C operating junction temperature and are priced at $2.30 each in 1,000-piece quantities. All versions are available from stock.

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