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DC/DC converter offers 4.2-42V input voltage range

Posted: 28 Oct 2011 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC converter? switching regulator? quiescent current?

Linear Technology Corp. has rolled a series of 750mA, 42V LT3973 DC/DC converters with integrated boost and catch diodes. It has a Burst Mode operation that keeps quiescent current under 2.5?A IQ at 12VIN to 3.3VOUT. The step-down switching regulator delivers 4.2-42V input voltage range that makes it ideal for automotive and industrial applications, said the company.

The unique design of the LT3973 maintains a minimum dropout voltage of 530mV when the output voltage drops below the programmed output voltage, ideal for applications subjected to scenarios such as automotive cold-crank. Switching frequency is user programmable from 200kHz-2.2MHz, enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency bands, noted Linear Tech.


The step-down regulator delivers up to 750mA of continuous output current.

The LT3973 uses a high efficiency 250mVCE(sat) switch, with the necessary boost and catch diodes, oscillator, control and logic circuitry integrated into a single die. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 10mVPK-PK. Special design techniques and a new high voltage process enable high efficiency over a wide input voltage range, and the LT3973's current mode topology enables fast transient response and excellent loop stability, claimed the company. Other features include a power good flag, internal catch diode current limit and thermal protection.

The LT3973EDD is packaged in a 3 x 3mm DFN-10, and the LT3973EMSE is in a thermally enhanced MSOP-10, priced starting at $2.75 and $2.85 each, respectively, for 1,000 piece quantities. The LT3973IDD and LT3973IMSE are tested and guaranteed to operate from a -40C to 125C operating junction temperature and are priced at $3.03 and $3.14 each, respectively, in 1,000 piece quantities. The LT3973HDD and LT3973HMSE are tested and guaranteed to operate from a -40C to 150C operating junction temperature and are priced at $3.38 and $3.49 each, respectively, in 1,000 piece quantities All versions are available from stock.

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