Step-Down DC/DC Converter

Linear Technology has announced the H-grade version of the LT3692A, a monolithic, dual output step-down switching regulator that delivers up to 3.5 A of continuous output current from each channel. It operates from a VIN range of 3 V to 36 V with transient protection to 60 V, making it well suited for load dump and cold-crank conditions found in automotive applications. Independent input, shutdown, feedback, soft-start, current limit and comparator pins for each channel simplify complex power supply tracking/sequencing requirements. The LT3692A’s switching frequency is user-programmable from 250 kHz to 2.25 MHz, enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency bands.

The H-grade versions operate up to a junction temperature of 150°C, compared to the E- and I-grade versions’ 125°C maximum junction temperature. All electrical specifications are identical for the E, I and H. The H-grade parts are tested and guaranteed to the maximum junction temperature of 150°C, and are suited for automotive and industrial applications which are subject to high ambient temperatures.

The LT3692AHUH is packaged in a 32-lead 5 mm by 5 mm QFN, priced starting at $4.95 each for 1,000 piece quantities. LT3692AHFE is packaged in a thermally enhanced TSSOP-38 and is FMEA compliant, pricing starts at $5.37 each for 1,000 piece quantities.

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