Switching regulator suits automotive applications

Edited by the Electronicstalk editorial team Oct 28, 2005

The LT3437 is a 60V (with transients up to 80V) 200kHz step-down switching regulator with quiescent current under 100uA.

Linear Technology has developed the LT3437, a 60V (with transients up to 80V) 200kHz step-down switching regulator with quiescent current under 100uA.

The LT3437 operates within an input range of 3.3 to 60V, making it ideal for load dump or cold-crank conditions commonly found in automotive applications.

Its 500mA internal switch can deliver up to 400mA of continuous output current at voltages as low as 1.25V.

The LT3437's burst mode operation offers ultralow quiescent current, well suited for applications such as automotive or telecomms systems, which demand always-on operation and optimum battery life.

The combination of its 3 x 3mm DFN package (or thermally enhanced TSSOP-16E) and 200kHz switching frequency, which keeps external inductors and capacitors small, provides a very compact, thermally efficient footprint.

The LT3437 utilises a high efficiency 500mA, 0.8ohm switch with the necessary oscillator, control and logic circuitry integrated into a single die.

Special design techniques and a high voltage process 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 external synchronisation (from 240 to 700kHz), soft-start capability and burst mode defeat for low noise applications.

Pricing for the LT3437EDD DFN version starts at $2.25.

The LT3437IDD, which is tested and guaranteed to operate from a -40 to +125C operating junction temperature, is priced at $2.70 each.

The LT3437EFE TSSOP-16E version pricing starts at $2.30 each.

All prices are for 1000-piece quantities and all versions are available from stock.