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LTM4600 DC/DC ?Module thermal performance

Posted: 20 May 2009 ?? ?Print Version ?Bookmark and Share

Keywords:LTM4600? stepdown regulator? guideline design?

The LTM4600 DC/DC ?Module is a complete high power density stepdown regulator for 10A continuous (14A peak) loads. The ?Module has two voltage options: 20Vin maximum for the LTM4600EV and 28Vin maximum for the LTM4600HVEV each housed in a small 15mm x 15mm x 2.8mm LGA surface mount package. Load current derating curves are provided in the datasheet for several input voltage, output voltage and ambient temperatures with air flow. These derating curves provide guidelines for using the LTM4600 in ambient environments with regard to safe-operating-area.

The purpose of this thermal application note is to provide a guideline for using the ?Module in ambient environments with or without air flow. The goal is to measure the temperature of a design, derive thermal models for different cases and finally determine the junction-to-ambient thermal resistance in units of C/W in the heat path. The data includes power loss curves, safe operating curves, thermal camera images and current derating curves verses ambient temperature with and without a heat sink. Also air flow will be included in the derating curves. The 24V designs are analyzed for a worse case temperature rise due to the lower efficiency exhibited in these higher input voltage designs.

View the PDF document for more information.





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