Overview

Product Details

Demonstration circuit DC2681A-A features the LTM4645EY, a 25A high efficiency, switch mode stepdown power µModule® regulator. The input voltage range is from 6V to 15V. To use DC2681A-A for input voltage range from 4.7V to 6V, connect INTVCC to SVIN (change R22 from OPT to 0Ω), DRVCC to VIN (change R21 from 0Ω to OPT, R28 from OPT to 0Ω). The output voltage range is 0.6V to 1.8V. Derating is necessary for certain VIN, VOUT, frequency and thermal conditions. The DC2681A-A offers the TRK/SS pin allowing the user to program output tracking or soft-start period. The board operates in continuous conduction mode in heavy load conditions. For high efficiency at low load currents, the MODE_PLLIN jumper selects pulse-skipping mode for noise sensitive applications or burst mode operation in L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. BOARD PHOTO less noise sensitive applications. The MODE_PLLIN pin also allows the LTM4645 to synchronize to an external clock signal (between 400kHz and 800kHz). DC2681A-A has the option of choosing both internal and external compensation circuit for LTM4645. Tying the PHASMD pin to different voltage generates certain phase difference between MODE_PLLIN and CLKOUT. The LTM4645 data sheet must be read in conjunction with this demo manual prior to working on or modifying demo circuit DC2681A-A.

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