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Switching regulator handles cold-crank in cars

Posted: 29 Oct 2007 ?? ?Print Version ?Bookmark and Share

Keywords:step-down switching regulator? linear controller? automotive applications?

A switching regulator and a linear controller suitable for load dump and cold-crank conditions found in automotive applications has been launched by Linear Technology.

Packaged in a 3mm x 3mm DFN, the LT3500 is 2A, 36V step-down switching regulator that operates from a VIN range of 3V to 36V (40VMAX). Its 2.3A internal switch can deliver up to 2A of continuous output current at voltages as low as 0.8V. Switching frequency is user programmable from 250kHz to 2.2MHz, enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency bands. The integrated LDO controller, combined with an NPN transistor, ensures very low noise output from the primary channel or as a second channel. The LT3500's 3mm x 3mm DFN-10 package and high switching frequency, which keeps external capacitors and inductor small, provide a very compact, thermally efficient footprint.

The LT3500's main switcher utilizes a high efficiency 2.3A, 450mVCESAT switch, with the necessary oscillator, control, logic circuitry and LDO controller integrated into a single die. Special design techniques enable high efficiency over a wide input voltage range while its current mode topology enables fast transient response and excellent loop stability. Other features include a power good flag and soft-start capability.

The LT3500EDD pricing starts at $3.25 each for 1,000-piece quantities. The LT3500IDD is tested to operate from a -40C to 125C operating junction temperature and is priced at $3.90 each. The LT3500HDD is tested and guaranteed to operate from a -40C to 150C operating junction temperature and is priced at $4.15 each. All versions are available from stock.




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