كتب : Hatem Maher
The Real Madrid forward converted home the awarded spot kick nine minutes after the break after he was brought down by Ecuador's Ecuador's Giovanni Espinoza.
Robinho's fourth strike in the tournament handed Brazil their second successive victory following their opening defeat at the hands of Mexico.
Ecuador then pushed forward searching for the equalizer but couldn't deliver to crash out of the tournament following a third successive defeat.
Mexico and Chile have also booked their berth in the last eight after they played out a goalless draw in a dull match.
Mexio are on top of Group B with seven points, one ahead of Brazil and three clear of third-placed Chile.