The 25-year-old all-rounder, who was named man of the match in this year's World Cup final, was nearly three times over the limit when his car was involved in a minor collision with the back of another vehicle in Manchester, northwest England.
Faulkner, who plays with English county Lancashire in the city, had been at a restaurant and did not want to walk a mile home in heavy rain, Manchester Magistrates' Court heard.
Sentencing him, District Judge Mark Hadfield said: "I am sure you accept it was foolhardy in the extreme to get behind the wheel of your vehicle having been out for a meal with your friend."
Lancashire head coach Ashley Giles was present in court. Cricket Australia last month temporarily banned Faulkner for "conduct that is unbecoming of a representative", meaning he will miss Australia's limited overs matches against England and Ireland in August and September.
He will have to undergo an alcohol management counselling programme. Outside court, a statement was read to reporters on Faulkner's behalf.
"My decision to drive that day was wholly my own and clearly it was an error in my judgement," the cricketer said.
"I apologise unreservedly for my behaviour but I accept this does not and should not excuse my actions.
"I am deeply embarrassed and sorry. I will ensure this remains an isolated bad decision on my part."