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Dual channel DC/DC converter gives CCD bias

Posted: 30 May 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Linear? LT3487? DC/DC? converter?

Linear Technology Corp. has announced the LT3487, a dual channel (boost/inverter), 2MHz DC/DC converter with output disconnect. The device's internal 750mA/900mA 30V switches can deliver up to 45mA at 15V and 90mA at -8V from a single Li-ion cell, providing bias for the latest generation CCD imagers, said the company.

The product input voltage range of 2.3V to 16V enables inputs from Li-ion to multiple cell alkaline/NiMH batteries. Switching at a constant 2MHz, the device uses tiny low profile capacitors and inductors, generating low noise outputs that are easy to filter, said Linear Tech. Schottky diodes are integrated into the IC while output voltages can be set with only one resistor per channel, reducing external component count. Packaged in a 3-by-3mm DFN, the entire solution has less than a 1mm profile and occupies just 50mm2.

Linear Tech said the device offers internal sequencing circuitry that disables the negative channel until the positive channel has reached 87 percent of its final value. This ensures that the sum of the two outputs is always positive. Intelligent soft-start allows sequential soft-start of the two channels with a single capacitor.

The LT3487EDD is available from stock and pricing starts at $2.30 each for 1,000-piece quantities.

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Related Datasheets
Part Number Description Category
? LT3487 Boost and Inverting Switching Regulator for CCD Bias ICs, Interface



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