Step-down DC/DC converter delivers low quiescent current

Milpitas, Calif.—Linear Technology Corp. has developed a 2A, 36V step-down switching regulator with Burst Mode operation to keep quiescent current under 50-µA.

The LT3681 operates within a VIN range of 3.6V to 34V with transient protection to 36-V, making it suitable for load dump and cold-crank conditions found in automotive applications.

Its 3.2-A internal switch can deliver up to 2A of continuous output current to voltages as low as 1.26V. Its integrated Schottky and boost diodes offer a very compact footprint required in automotive and telecom applications. The LT3681's Burst Mode operation offers ultra-low quiescent current, well suited for applications such as automotive or telecom systems, which demand always-on operation and optimum battery life.

Switching frequency is user-programmable from 300-kHz to 2.8-MHz, enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency bands. The combination of its 3mm x 4mm DFN-10 package, integrated diodes and high switching frequency keeps external inductors and capacitors small.

The LT3681 uses a high efficiency 3.2A, 360mVCESAT switch, with the necessary boost diode, Schottky diode, oscillator, control and logic circuitry integrated into a DFN package. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 15mVPK-PK.

Pricing: Starts at $3.65 each for 1,000-piece quantities.
Availability: From stock.
Datasheet: click here.

Linear Technology Corp., 1-408-432-1900,

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