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LTC4440 - Charging pump not working


my circuit is running. I try to switch the N-FET


but the charging pump is not working working. The voltage is too less.

I use the same circuit like in the datasheet ( page 1). The difference is, that I use only the High-side switch and I have only the N FET connected.

Is it possible, that there must be an resistor load at the TS pin?

Best reagrds,

Dirk Seidel

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