In a medium bowl, whisk together the flour, baking powder, salt and cinnamon to incorporate.
In a large bowl, whisk together the crushed pineapple, sugars, mashed banana and eggs. Slowly whisk in the buttermilk until smooth. Add the flour mixture and fold until a batter forms. Stir in the brown butter.
Heat two 8-inch nonstick skillets, greased with cooking spray, over medium heat. Ladle ½ cup of batter into each skillet and cook, flipping once, until golden brown and puffed, 2 minutes per side. Repeat with the remaining pancake batter. You should have about 8 pancakes.
Divide the pancakes between plates; garnish with chopped pecans, sliced banana and pineapple; then serve with maple syrup.