Dr. Phil -- I'm Dumping ANOTHER One of My L.A. Mansions

Dr. Phil is trying to unload his dinky little mansion on the Sunset Strip ... the weakest property in his $40 million dollar L.A. real estate collection ... and all he wants is a mere $2.7 mil.

TMZ has learned ... the doc just officially listed the 2,300 square foot Hollywood home ... which sits right above the infamous Chateau Marmont.

Phil bought the pad in 2008 for $2.56 million -- after falling in love with its 3-bedrooms, 2-baths, hardwood floors, swimming pool and panoramic L.A city views.

The move comes as no surprise -- considering the doc has been on a mission to sell off a bunch if his real estate ever since he dropped $29.5 million on an 11,000 square foot palace in Bev Hills in 2010.

Just last year, Phil sold his OTHER Beverly Hills mansion for $12 million ... and listed his 7,000 square foot hideaway in Beverly Glen for a cool $6.25 mil -- though he's since pulled that home off the market.