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DC/DC suits cold-crank conditions in automotives

Posted: 04 Apr 2007 ?? ?Print Version ?Bookmark and Share

Keywords:step-down switching regulator? DC/DC voltage converters? cold-crank conditions?

Linear Technology Corp. has announced the LT3684, a 2A, 34V step-down switching regulator packaged in a 3-by-3mm DFN or MSOP-10E. The LT3684 operates within a VIN range of 3.6-34V (36VMAX), making it suitable for load dump and cold-crank conditions found in automotive applications. Its 3.2A internal switch can deliver up to 2A of continuous output current at voltages as low as 1.265V. Switching frequency is user-programmable from 300kHz to 2.8MHz, enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency bands.

Compact footprint
The combination of its DFN-10 package (or thermally enhanced MSOP-10E) and high switching frequency, which keeps external capacitors and inductor small, provides a compact, thermally efficient footprint.

The LT3684 uses a high-efficiency 3.2A, 0.18-ohm switch, with the necessary boost diode, oscillator, control and logic circuitry integrated into a single die. Special design techniques enable high efficiency over a wide input voltage range while its current-mode topology enables fast transient response and excellent loop stability. Other features include a power good flag and soft-start capability.

Pricing, availability
The LT3684EDD and LT3684EMSE pricing starts at $2.95 each for 1,000-piece quantities. The LT3684IDD and LT3684IMSE are tested and guaranteed to operate from a -40C to 125C operating junction temperature, are priced at $3.54 each. All versions are available from stock.

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