Boost converter will deliver 15V from 500mV

Linear Tech has introduced a boost converter that starts from 1.8V minimum, but will run with inputs from 0.5-5.5V.

It is synchronous, with 1.5A switches, delivering up to 400mA at 12V from 5V.

“Its 1.5A current limit makes it well suited for input current constrained applications such as PCI Express while minimizing the size of the required externals,” said the firm.

Called LTC3121, it has an output disconnect to prevent the battery bleeding through the chip on shut-down (with <1µA quiescent from battery), and in normal operation it stays in regulation when the input voltage exceeds the output voltage.

Pin-selectable burst mode which drops quiescent current to 25µA, or constant PWM mode keeps noise to a minimum.

For compact dc-dc converters, it comes in a 3 x 4mm DFN-12 thermally-enhanced package switches at 3MHz for small passive components, or it can run as slow as 100kHz.

Switch on-resistances of 121mΩ (n-channel) and 188mΩ (p-channel) contribute to the 95% peak efficiency.

Additional features include external synchronisation, soft start, output over-voltage protection and short-circuit protection.

The industrial-grade LTC3121IDE is guaranteed to operate over -40°C to 125°C operating junction temperature.

steve bush

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