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34V dc/dc chip suits automotive systems

Posted: 28 Oct 2002 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? lt1934? lt1934 1? dc/dc converter ic? dc/dc conversion ic. Dc converter ic?

Built in bipolar technology, Linear Technology Corp.'s LT1934 step-down dc/dc regulator-IC family features ultralow standby power and an ultrawide input range in a small package for automotive, industrial-control, and distributed-supply applications.

"It is a true micropower chip that features a burst-mode operation and has a 34V input-voltage rating," said Tony Armstrong, product-marketing manager. Those specs, combined with a low-profile, 1mm ThinSOT (SOT-23) package, make "the overall device unique," he said.

The 34V input rating is particularly useful for automotive applications, where the minimum voltage-rating requirements for supporting devices usually call for a potential at least equal to two lead-acid batteries placed in series, such as used in tow trucks for jumping car batteries.

At the same time, the LTC1934's micropower operation is a good fit for automotive applications that use microprocessors, many of which must be in an always-on state when the car is parked, even for weeks at a time.

With a wide input range that goes down to 3.2V, the LT1934 can also be used to regulate a variety of power sources, from four-cell alkaline batteries and 5V logic rails to unregulated wall transformers, the company said.

Quiescent current is 12?A and a zero-current shutdown mode disconnects the load from the input source, simplifying power management in battery-powered systems.

A burst-mode switching feature and a low-loss internal power switch combine to deliver high efficiency over a range of load current at output voltages down to 1.25V. The LTC1934 delivers up to 300mA to its load. A second version of the chip, the LT1934-1, is rated at a lower current, allowing optimum choice of smaller external components when the required output current <60mA.

Pricing for the LT1934 is $2.10 each in 1,000 pieces.

EE Times

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