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36VIN with 60V Transient Protection, Dual Tracking 3.5A(IOUT), 2.25MHz Step-Down DC/DC Converter with 150°C Maximum Junction Temperature

17th January 2012

Linear Technology (UK) Limited

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Datasheet

Linear Technology announces the H-grade version of the LT3692A, a monolithic, dual output step-down switching regulator that delivers up to 3.5A of continuous output current from each channel. It operates from a VIN range of 3V to 36V with transient protection to 60V, making it ideal 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 250kHz to 2.25MHz, 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 ideal for automotive and industrial applications which are subject to high ambient temperatures.

The LT3692AHUH is packaged in a 32-lead 5mm x 5mm 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. Both versions are available from stock.

Summary of Features: LT3692AH

• Wide Input Range:

o Operation from 3V to 36V

o OVLO Protects Circuit Through 60V Transients

• Program or Pin-Strap Six Output Ranges: 0V to 5V, 0V to 10V, –2.5V to 7.5V, ±2.5V, ±5V, ±10V

• Independent Supply, Shutdown, Soft-Start, UVLO, Programmable Current Limit & Programmable Power Good for Each 3.5A Regulator

• Die Temperature Monitor

• Adjustable/Synchronizable Fixed Frequency Operation from 250kHz to 2.25MHz with Synchronized Clock Output

• Independent Synchronized Switching Frequencies Optimize Component Size

• Antiphase Switching

• Outputs Can Be Paralleled

• Flexible Output Voltage Tracking

• Low Dropout: 95% Maximum Duty Cycle

• 5mm x 5mm QFN Package or FMEA Compliant 38-Pin Exposed Pad TSSOP Package

• -40°C to 150°C Junction Temperature Range