Global Sources
EE Times-India
Stay in touch with EE Times India
 
 
Power/Alternative Energy  

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.

 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.





Comment on "Buck regulator claims 93% current ef..."
Comments:  
*  You can enter [0] more charecters.
*Verify code:
 
Highly Recommended Articles

 
Webinars

Seminars

Visit Asia Webinars to learn about the latest in technology and get practical design tips.

 

Go to top             Connect on Facebook      Follow us on Twitter      Follow us on Orkut

 
Back to Top