Head coach quits Wolfsburg after five months
Schmidt told Wolfsburg he was stepping down "to improve the current situation with new impulses from the coaching bank", the club said in a statement.
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The 50-year-old Swiss had only been at the helm for five months.
Schmidt's last game was Saturday's 2-1 home defeat by runaway league leaders Bayern Munich, who needed a 91st-minute penalty to seal the win.
Wolfsburg say Schmidt walked away to "relieve the increasing public pressure -- and especially against him personally -- on the club".
He took over in September after predecessor Andries Jonker was sacked.
Schmidt leaves with the 2015 German Cup winners 14th in the table and only one point above the relegation play-off place.
The club said a caretaker coach will be announced on Tuesday ahead of Friday's league game at Mainz, who are third from bottom.