Hello Dirk,
The maximum leakage current on ALERT (output) pin at 125degC will be <1uA (0.2uA typically). Since this is an open drain output pin the current direction will be into the device ie. From ALERT output pin into the ESD-gnd and Open drain ground inside the device. One more important consideration to your low current design is the Quiescent current, found in Page 3 of datasheet. Thanks for posting and I hope to have answered your question.
Best Regards,
Abhi Muppiri
Applications Engineer
MHR- Sensing Products
Texas Instruments
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