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Linear Tech releases switch regulator with Burst Mode

Posted: 23 May 2006     Print Version  Bookmark and Share

Keywords:Linear  LT3481  switching  regulator 

Linear Technology Corp. has announced the LT3481, a 2A, 36V step-down switching regulator with Burst Mode operation to keep quiescent current under 50μA.

The device operates within a VIN range of 3.6V to 34V, making it suitable for load dump and cold-crank conditions in automotive applications. Its 3.2A internal switch can deliver up to 2A output current and as low as 1.26V voltage.

According to Linear Tech, the product's Burst Mode operation offers ultra-low quiescent current suited for automotive or telecom systems, which demand always-on operation and optimum battery life. Switching frequency is user programmable from 300kHz to 2.8MHz, enabling optimisation efficiency while avoiding critical noise-sensitive frequency bands.

The device utilises a 3.2A, 0.18 ohm switch with boost diode, oscillator, control and logic circuitry integrated into a single chip. Low ripple Burst Mode operation is said to maintain high efficiency at low output currents while keeping output ripple below 15mVPK-PK.

The device is able to operate efficiently over a wide input voltage range and its current mode topology enables fast transient response and excellent loop stability, Linear said. Other features include external synchronization from 275kHz to 475kHz, a power good flag and soft-start capability.

The combination of the product's 3-by-3mm DFN-10 package (or thermally-enhanced MSOP-10E) and high switching frequency is said to keep external inductors and capacitors small.

Pricing for the LT3481EDD and LT3481EMSE versions of the device starts at Rs.146.61 ($3.25) each, for 1,000-piece quantities. The LT3481IDD and LT3481IMSE versions operate over a -40°C to 125°C temperature range and priced at Rs.175.93 ($3.90) each in 1,000-piece quantities. All versions are available from stock.

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Related Datasheets
Part Number Description Category
LT3481 36V, 2A, 2.8MHz Step-Down Switching Regulator with 50µA Quiescent Current ICs, Interface



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