Achieving typical efficiencies greater than 95%, the miniature AP3403 step-down dc-dc converter from Diodes Incorporated helps lengthen the battery lifetime of smartphones and other low-voltage portable products. This converter is a synchronous pwm device that drives a load at up to 600mA, with high efficiency maintained through a configuration of external resistor, capacitor and inductor components.
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To support mini Li-Ion battery operation, the input voltage range is low at 2.7V to 5V, with no-load current being only 34µA. The buck converter ensures excellent line and load regulation and employs current mode control to deliver fastest possible transient response and cycle-by-cycle current limit. By operating at a ripple-reducing fixed 2MHz, the AP3403 is able to help reduce the cost and size of external circuit components, while its ultra-small, thermally efficient U-DFN1616 package further aids a reduction in overall circuit footprint.
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The AP3403 600mA buck converter from Diodes Incorporated is priced at $0.33 USD each in 1k quantities. An evaluation board is also available.
source: http://www.powerpulse.net/story.php?storyID=32347
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