Linear Technology Corporationannounces the LT8640, a 5A, 42V input capable synchronous step-down switching regulator. A unique Silent Switcher™ architecture, combined with spread spectrum frequency modulation, reduces EMI/EMC emissions by more than 25dB even with switching frequencies in excess of 2MHz, enabling it to easily pass the automotive CISPR25, Class 5 peak limits. Synchronous rectification delivers efficiency as high as 95% with a switching frequency of 2MHz. Its 3.4V to 42V input voltage range makes it suited for both automotive and industrial applications.
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The LT8640’s internal high efficiency switches deliver up to 5A of continuous output current and peak loads of 7A to voltages as low as 0.97V. The devices’s Burst Mode® operation keeps quiescent current under 2.5µA in no-load standby conditions, making it well-suited for applications such as automotive “always-on” systems, which need to extend operating battery life. The LT8640’s unique design maintains a minimum dropout voltage of only 100mV at 1A under all conditions, enabling it to excel in scenarios such as automotive cold-crank.
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The LT8640 utilizes 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 LT8640’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.
The LT8640EUDC is packaged in a 3mm x 4mm QFN package and is priced at $4.35 each. An industrial temperature version, the LT8640IUDC, is tested and guaranteed to operate from a -40 to 125 degrees C operating junction temperature and is priced at $4.79 each. An automotive temperature version, the LT8640HUDC, is tested and guaranteed to operate from a -40 to 150 degrees C operating junction temperature and is priced at $5.04 each. All pricing is for 1,000-piece quantities and all versions are available from stock.
source: http://www.powerpulse.net/story.php?storyID=31260
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