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Demonstration circuit 2147A features the LTM4631, the high efficiency, high density, dual 10A, switch mode step-down μModule® power module regulator in an ultrathin 1.91mm height package. The input voltage is from 4.5V to 15V and the demo board provides 1.2V and 1V outputs at up to 10A maximum from each channel. As explained in the data sheet, 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. Two outputs can be connected in parallel for a single 20A output solution with optional jumper resistors. 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 LTM4631 in a compact 16mm × 16mm × 1.91mm LGA package make it ideal for use in many high density point-of-load regulation applications. The LTM4631 data sheet must be read in conjunction with this demo manual for working on or modifying the demo circuit DC2147A.

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