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Linear Tech dc-dc converter generates 8V, 30mA

Posted: 24 May 2004 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? dc-dc converter? ltc3459?

Linear Technology Corp. has released a 10V synchronous boost dc-dc converter with onboard output disconnect and inrush current limiting packaged in a ThinSOT.

The LTC3459 operates from an input voltage of 1.5- to 5.5V, making it suitable for single cell Li-Ion, or multicell NiMH, alkaline applications, as well as more general-purpose fixed rail systems. According to the company, it is well suited for "keep-alive" battery back-up systems that are required to deliver milliamps of current to rails as high as 9V when the main battery is being replaced.

With a 5V input voltage, the new dc-dc converter can generate 8V, 30mA. Additional features include output disconnect, inrush current limiting and short circuit protection. The LTC3459 Burst Mode operation uses 10?A of quiescent current, while a constant off-time (COT) architecture enables the use of tiny low cost capacitors and inductor.

During start-up, inductor current is controlled, preventing the inrush surge current found in many boost converters. In shutdown, the output is disconnected from the input and quiescent current is reduced to <1?A.

Pricing for the LTC3459 starts at $1.95 each in 1,000-piece quantities. The device is offered in low profile (1mm) SOT-23 package.





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