H-grade regulator for automotive applications

Linear Technology has announced an 'H'-grade version of the LT3680 3.5A, 36V step-down switching regulator, which is said to be ideal for automotive and industrial applications.

The step-down switching regulator features burst-mode operation to keep quiescent current under 75uA.

The LT3680 operates within a VIN range of 3.6-36V, making it suitable for load-dump and cold-crank conditions in automotive applications.

The H-grade version operates up to a junction temperature of 150C, compared with the 'E' and 'I' versions' 125C maximum junction temperature.

All electrical specifications are identical for the E-, I- and H-grade versions.

The H-grade devices are tested and guaranteed to the maximum junction temperature of 150C, making them ideal for automotive and industrial applications that are subjected to high ambient temperatures.

The LT3680's 4.6A internal switch can deliver up to 3.5A of continuous output current at voltages as low as 0.79V.

Its burst-mode operation ensures ultra-low quiescent current, well suited for applications such as automotive or telecom systems, which demand always-on operation and optimum battery life.

Switching frequency is user-programmable from 250kHz to 2.4MHz, enabling the designer to optimise efficiency while avoiding critical noise-sensitive frequency bands.

The LT3680's thermally enhanced MSOP-10E package and high switching frequency keep external inductors and capacitors small, providing a compact, thermally efficient footprint.

Other features include external synchronisation (from 250kHz to 2MHz), a 'power good' flag and soft-start capability.

Back to top