Step-down DC-DC converter has low quiescent current

31 May 2006 Power Electronics / Power Management

Linear Technology's LT3481 is a 2 A, 36 V step-down switching regulator with Burst Mode operation to keep quiescent current under 50 μA. The LT3481, available in 10-Pin MSOP and DFN-10 packages, operates within a VIN range of 3,6-34 V, well-suited for load dump and cold-crank automotive conditions. Its 3,2 A internal switch can deliver up to 2 A of continuous output current to voltages as low as 1,26 V. Switching frequency is user-programmable from 300 kHz to 2,8 MHz, enabling the designer to optimise efficiency while avoiding critical noise-sensitive frequency bands. The LT3481 has a high efficiency 3,2 A, 0,18 Ω switch, with the necessary boost diode, oscillator, control and logic circuitry integrated into a single chip. It maintains high efficiency at low output currents while keeping output ripple below 15 mV p-p.

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