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MODE/SYNC Input Specification

Category: Datasheet/Specs
Product Number: MAX17631

I have this circuit where two MAX17631 need to be synchronized with another switching IC (UCC2897A). So I connected the MODE/SYNC input pins of the two MAX together with the SYNC pin of the UCC.

The line is fixed at 5V (and the UCC doesn't work). If I isolate the pin of the UCC, it works (obviously without synchronization).

I tryed to put a 10k pull-down on the line, but it is still fixed at 5V.

In the previous version of the circuit there was only one MAX and it worked correctly.

In the MAX datasheet I found no data about the input current and capacitance of the MODE/SYNC input signal.

Any advice?