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38V, 2MHz Step-Down DC/DC Converter at Only 2.8µA Quiescent Current

17th November 2009

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Datasheet

Linear Technology has announced the LT3971, a 1.2A, 38V step-down switching regulator with an integrated boost diode. Its Burst Mode operation keeps quiescent current under 2.8µA in no load standby conditions. The LT3971's 4.3V to 38V input voltage range makes it ideal for automotive and industrial applications. Its internal 2.4A switch can deliver up to 1.2A of continuous output current to voltages as low as 1.19V.

The LT3971's Burst Mode operation offers ultralow quiescent current, making it well suited for applications such as automotive or industrial systems, which demand always-on operation and optimum battery life. Switching frequency is user programmable from 200kHz to 2MHz, enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency bands. The combination of its 10-lead 3mm x 3mm DFN-10 (or thermally enhanced MSOP) package and high switching frequency keeps external inductors and capacitors small, providing a compact, thermally efficient footprint.

The LT3971 utilizes a high efficiency 2.4A, 330mOhm switch, with the necessary boost diode, oscillator, control and logic circuitry integrated into a single die. 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 high efficiency over a wide input voltage range, and the LT3971's current mode topology enables fast transient response and excellent loop stability. Other features include a power good flag, soft-start capability, external clock synchronization and internal compensation.