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Buck regulator claims 93% current efficiency

Posted: 19 Oct 2011     Print Version  Bookmark and Share

Keywords:H-grade  MP-grade  step-down switching regulator 

Linear Technology introduces high temperature (H-grade) and High Reliability (MP-grade) versions of its step-down regulator, the LT3690.


This 36V input capable, synchronous step-down switching regulator can deliver up to 4A of continuous output current at efficiencies as high as 93 per cent.

The LT3690 operates within a VIN range of 3.9V to 36V, and offers transient protection to 60V targeting load dump and cold-crank conditions found in automotive applications. The LT3690's Burst Mode operation requires only 70µA of quiescent current, aimed at applications such as automotive or telecom systems, which demand always-on operation and optimum battery life. Switching frequency is user-programmable from 170kHz to 1.5MHz, enabling the designer to optimise efficiency while avoiding critical noise-sensitive frequency bands.

The combination of its 4mm x 6mm QFN-26 package and high switching frequency keeps external inductors and capacitors small, providing a compact, thermally efficient footprint.

The H-grade version offers guaranteed and tested operation from -40°C to a junction temperature of 150°C. Similarly, the MP-grade version offers guaranteed and tested operation from -55°C to a junction temperature of 150°C. Electrical specifications for the H-grade and the MP-grade are identical to the E and I grades. They are targeted at automotive, industrial and military applications, which are subject to high ambient temperatures.

Both the LT3690HUFE and the LT3690MPUFE are available in 26-lead 4mm x 6mm QFN packages. Pricing starts at Rs.255.61 ($5.70) and Rs.659.19 ($14.70) each, respectively, for 1,000-piece quantities and are available from stock.

Other features of LT3690HUFE and LT3690MPUFE include:
 • 4A continuous maximum output current.
 • Integrated 30mΩ n-channel synchronous switch.
 • 70µA IQ at 12VIN to 3.3VOUT.
 • Low Ripple Burst Mode Operation allows output ripple <15mVP-P.
 • Programmable input under-voltage lockout.
 • 0.8V feedback reference voltage.
 • Output voltage 0.8V to 20V.
 • Programmable and synchronisable oscillator (170kHz to 1.5MHz).
 • Soft-Start-up and output voltage tracking.
 • Short-Circuit Robust.
 • Power Good Flag.

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