Demonstration circuit DC1663A features the LTM®4628EV, the high efficiency, high density, dual 8A output, switch mode step-down power module. The input voltage is from 4.5V to 26.5V. The output voltage is programmable from 0.6V to 5.5V. Output current derating is necessary for certain VIN, VOUT, and thermal conditions. The board operates in continuous conduction mode in heavy load conditions. For high efficiency at low load currents, the MODE jumper (JP1) selects pulse-skipping mode for noise sensitive applications or Burst Mode® operation in less noise sensitive applications. The DC1663A sets the LTM4628EV default switching frequency to 400kHz; however the frequency is resistor programmable from 250kHz up to 780kHz. An internal phase-lock loop allows the module to be synchronized to an external clock. The board allows the user to program how its output ramps up and down through the TRACK/SS pin. The output can be set up to either coincidentally or ratio metrically track with another supply’s output. Remote output voltage sensing is available for improved output voltage regulation at the load point. These features and the availability of the LTM4628EV in a compact 15mm × 15mm × 4.32mm LGA package make it ideal for use in many high density point of load regulation applications. The LTM4628 datasheet must be read in conjunction with this demo manual for working on or modifying the demo circuit DC1663A. 

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