Linear introduces H-grade switching regulator

Linear Technology has announced a H-grade step-down switching regulator for load dump and cold-crank conditions commonly found in automotive applications as well as 24V industrial supplies.

The LT3686H is a 1.2A, 37VIN step-down switching regulator.

It operates within a VIN range of 3.6V to 37V with over-voltage lockout, protecting the regulator and load from transients as high as 55V.

Its internal 1.85A switch can deliver up to 1.2A of continuous output current at voltages as low as 0.8V.

The LT3686H's switching frequency is user programmable from 300kHz to 2.5MHz, enabling designers to maximise efficiency while avoiding critical noise-sensitive frequency bands.

Its low minimum on time enables it to provide high switching frequencies even with high step-down ratios.

For example, with an input as high as 16V, it can deliver a 3.3V output using a 2MHz switching frequency.

The LT3686H also uses a design that ensures it maintains constant frequency switching, even in very light load conditions.

The device's 3mm x 3mm DFN-10 package and high switching frequency, which keeps the external inductor and capacitors small, provides a compact, thermally efficient footprint.

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

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

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

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