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Step-down DC/DC offers 70?A quiescent current

Posted: 16 Mar 2007 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC? regulator? converter? Linear Tech? Burst Mode?

Linear Technology Corp. has announced a 2A, 38V step-down switching regulator with input transient protection up to 60V. Designated LT3480, this regulator's Burst Mode operation promises to keep quiescent current under 70?A in no load standby conditions, making it suitable for applications that demand always-on operation and optimum battery life.

The LT3480's 3.6-38V input voltage range and 60V transient protection makes it suitable for load dump and cold-crank conditions found in automotive applications. Its 3A internal switch can deliver up to 2A of continuous output current to voltages as low as 0.79V. Switching frequency is user programmable from 200KHz to 2.4MHz, optimizing efficiency while avoiding critical noise-sensitive frequency bands. The combination of its 3-by-3mm DFN-10 package for thermally enhanced MSOP-10E and high switching frequency keeps the external capacitors and inductor small, providing a compact, thermally efficient footprint.

The LT3480 uses a high-efficiency 3A, 0.25-ohm switch, with the necessary boost diode, oscillator, control and logic circuitry integrated on-chip. Low ripple Burst Mode operation maintains high-efficiency at low output currents while keeping output ripple below 15mVPK-PK. Special design techniques and a new high voltage process enable efficiency over a wide input voltage range while the LT3480's current mode topology enables fast transient response and loop stability. Other features include external synchronization (from 250kHz to 2MHz), a power good flag and soft-start capability.

The LT3480EDD and LT3480EMSE are priced starting at $3.45 and $3.55) each, respectively, for 1,000-piece quantities. The LT3480IDD and LT3480IMSE, which operate in the -40C to 125C temperature range, are priced at $4.14 and $4.26 each, respectively in 1,000-piece quantities.

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Related Datasheets
Part Number Description Category
? LT3480 38V, 2A, 2.4MHz Step-Down Switching Regulator with 70μA Quiescent Current ICs, Interface



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