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Linear launches power chip in tiny packet

Posted: 30 May 2008 ?? ?Print Version ?Bookmark and Share

Keywords:boost regulator? converter? batteries?

Linear Technology Corp. has introduced the LTC3100, a triple output converter, which includes a 700mA (ISW) synchronous boost regulator, a 250mA (IOUT) synchronous buck regulator and a 100mA (IOUT) LDO in a 3mm x 3mm QFN-16 package.

Both the boost and the buck regulators switch at 1.5MHz and use current mode, synchronous topologies. The LTC3100's boost converter operates from an input voltage range of 0.65V (start-up) to 5V making it compatible with single or multiple cell alkaline/NiMH and single cell Li-ion/polymer batteries and can deliver output voltage from 1.5V to 5.25V. The 250mA buck converter can be run directly from the output of the boost converter or from an independent 1.8V to 5.5V input and can deliver outputs for as low as 0.6V. The LDO's input is tied to the output of the boost converter, and requires only 130mV of dropout voltage offering an additional low-noise output adjustable to 0.6V.

The combination of a boost, buck and LDO make the LTC3100 well suited for applications powered by low-voltage inputs such as single or dual cell alkaline batteries. For example, from a single cell alkaline input, the synchronous boost converter can deliver a higher voltage rail such as 3.3V for microprocessor I/O, then the LDO will deliver a 3.0V output for memory and the synchronous step-down connected to the output of the boost regulator can deliver a 1.0V VCORE rail.

Synchronous rectification enables efficiencies of over 90 percent and burst-mode operation lowers quiescent current to 15�A, providing extended battery runtime. Constant 1.5MHz frequency operation ensures low-noise and high-efficiency operation with tiny external inductors and capacitors.

- Ismini Scouras

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