2.4-MHz DC-DC Converter Withstands High Temperatures

Sept. 10, 2009
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The H-grade version of the LT3972 is a 3.5-A, 33-V step-down switching regulator with Burst Mode operation to keep quiescent current under 75 µA. The LT3972 operates within a VIN range of 3.6 V to 33 V, with overvoltage lockout protection against transients as high as 62 V, making it ideal for load dump and cold-crank conditions found in automotive applications. Its internal 4.6-A switch can deliver up to 3.5 A of continuous output current to voltages as low as 0.79 V. The devices’s Burst Mode operation offers ultralow 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 200 kHz to 2.4 MHz, enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency bands. The H-grade version operates up to a guaranteed maximum junction temperature of 150ºC, making it suited for automotive and industrial applications, which are subjected to high ambient temperatures. Pricing for the LT3972HMSE starts at $5.47 each in lots of 1000; the part is available from stock. LINEAR TECHNOLOGY CORP., Milpitas, CA. (408) 432-1900.


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