Question: End Application: Industrial Digital Printer Part Number: LTM4644 Hi, I'm using the Quad DC/DC Module Regulator, LTM4644 in a few circuit boards without any problems. I have a slightly different application in that I only need to use 3 outputs. On the unused section, can you tell me what connections I should make to the pins, e.g. to ground, no connect etc. Answer: Yes, you can leave the phases for the unused phase open, but it would be recommended to ground the RUN, SVIN, PVIN pin for that phase to be sure. Internally the phases only have a clock connection between them, otherwise they are separate. It would be recommended they leave the 4th output as the unused phase.