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Converter can be configured as dual boost, boost/inverter, or dual inverter

Posted: 11 Nov 2004 ?? ?Print Version ?Bookmark and Share

Linear Technology Corp. introduced a dual channel (boost/inverter), 1.3A, 1.2MHz dc-dc converter housed in a low profile (0.75mm), 10-lead 3-by-3mm DFN package.

The new LT3471 converter can be configured as a dual boost, a boost/inverter, or a dual inverter, since the output voltage error amplifiers can sense to ground, providing boost or inverting control capability. The product's input voltage range of 2.4V to 16V makes it suitable for Li-ion, multiple cell Alkaline/NiMH batteries, as well as 12V power.

The converter's low VCESAT bipolar switches enable it to deliver 42V high current outputs from a 9mm? package. The press release said that the LT3471 switches at 1.2MHz, allowing the use of tiny, low cost, low profile inductors and capacitors. High inrush current at start-up is eliminated using a programmable soft-start function, where an external RC sets the current ramp rate, and the constant frequency current mode PWM architecture provides a low, predictable output noise that is easy to filter.

The LT3471 is rated at 42V, making it suitable for boost converters up to 40V as well as SEPIC and flyback designs. Each channel can generate 5V at up to 630mA from a 3.3V supply, or 5V at 360mA from four alkaline cells in a SEPIC design.

The LT3471EDD is available from stock and pricing starts at $2.80 each for 1,000-piece quantities.

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