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Synchronous step-down switching regulator offers 96% efficiency

Posted: 24 May 2012 ?? ?Print Version ?Bookmark and Share

Keywords:step-down switching regulator? DC/DC converter?

Linear Technology Corp. has rolled a 2.5A, 42V input capable synchronous step-down switching regulator. Synchronous rectification in the LT8610 enables 96 percent efficiency, and burst mode operation maintains quiescent current

Input voltage range of 3.4V to 42V suits the device for automotive and industrial applications. It has internal 3.5A switches that can deliver up to 2.5A of continuous output current to voltages as low as 0.97V.

The LT8610 is designed to maintain minimum dropout voltage of only 200mV (@1A) under all conditions, making it suitable for scenarios such as automotive cold-crank. Also, minimum on-time of only 50ns enables 2MHz constant frequency switching from a 16V input to a 1.8V output, enabling designers to optimize efficiency while avoiding critical noise-sensitive frequency bands. The LT8610�s 16-lead thermally enhanced MSOP package and high switching frequency keeps external inductors and capacitors small, providing a compact, thermally efficient footprint.

The LT8610 uses internal top and bottom high efficiency power switches 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 10mVPK-PK. Special design techniques and a new high speed process enable high efficiency over a wide input voltage range, and the LT8610s�s current-mode topology enables fast transient response and excellent loop stability. Other features include internal compensation, a power good flag, output soft start/tracking and thermal protection.

Linear is also offering the LT8611. This device includes all of the features of the LT8610, plus a built-in current sense amplifier with monitor and control pins, enabling accurate input or output current regulation and limiting. It is offered in a 3 x 5mm 24-lead QFN package.

The LT8610EMSE comes in a thermally enhanced MSOP-16 package and is priced from $3.55 each. An industrial temperature version, the LT8610IMSE, is tested and guaranteed to operate from a -40?C to 125?C operating junction temperature and is priced from $3.91. An automotive temperature version, the LT8610HMSE, is tested and guaranteed to operate from a -40?C to 150?C operating junction temperature and is priced from $4.16 each. All pricing is for 1,000 piece quantities and all versions are available from stock.

The LT8611EUDD is packaged in a 3mm x 5mm QFN-24 package and is priced from $3.80 each. An industrial temperature version, the LT8611IUDD, is tested and guaranteed to operate from a -40?C to 125?C operating junction temperature and is priced from $4.16. An automotive temperature version, the LT8611HUDD, is tested and guaranteed to operate from a -40?C to 150?C operating junction temperature and is priced from $4.41 each. All pricing is for 1,000 piece quantities and all versions are available from stock.





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