Linear Technology Corporationannounces the LT3697, a 35-V input capable step-down switching regulator (with 60V transient protection) designed to power 5V USB applications. The LT3697 delivers precise 5V regulation at 2.5A to a remote USB port using programmable cable drop compensation to accurately correct the voltage drop from a long connecting cable regardless of variations in load current. The 5V output accuracy at the USB port is ±1.0% over the -40 to 125 degrees C temperature range. The LT3697 utilizes an accurate and programmable output current limit, a power good indicator and an output current monitor pin to improve system reliability and safety.
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This also allows the user to implement latchoff or auto-retry functionality, which can eliminate the need for a USB switch IC. An internal high efficiency switch delivers 90% efficiency and can be programmed to switch at 2MHz, keeping switching noise out of critical frequency bands such as AM radio. The combination of its 16-lead thermally enhanced MSOP package and high switching frequency ensures that external inductors and capacitors are small, providing a compact, thermally efficient footprint.
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The LT3697EMSE is packaged in a thermally enhanced MSOP-16 package and is priced at $2.75 each. An industrial temperature version, the LT3697IMSE, is tested and guaranteed to operate from a -40 to 125 degrees C operating junction temperature and is priced at $3.03. All pricing is for 1,000 piece quantities and both versions are available from stock.
source: http://www.powerpulse.net/story.php?storyID=30871
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