Robinson attended Louisiana State University, where he played two seasons of college football for the LSU Tigers under head coach Les Miles.

[1] Robinson was suspended indefinitely from LSU's football team midway through the 2014 season due to a failed drug test and substandard academics.

Robinson's performance was sub-par and he elected to skip the bench press and wasn't able to complete the short shuttle or three-cone drill after suffering a calf injury.

On March 14, 2016, he attended LSU's Pro Day, but held a private workout afterwards due to his tumultuous past with the team.

Robinson was considered to be one of the top press corners in the draft and was described in scouting reports as a player with a long frame and great man coverage ability.

[11] He competed with Kenneth Acker, Keith Reaser, Dontae Johnson, Marcus Cromartie, Chris Davis, Will Redmond, and Prince Charles Iworah throughout training camp for a role as the backup cornerback.

Head coach Chip Kelly named him the fifth cornerback on the depth chart to begin the season, behind Tramaine Brock, Jimmie Ward, Davis, and Johnson.

On October 2, 2016, Robinson earned the first start of his career in place of Jimmie Ward, who suffered a quad injury during a special teams play the week prior.

[15] He finished his rookie season with a total of 28 combined tackles (25 solo), 8 pass deflections, and 1 interception in 14 games and 6 starts.

[16] Robinson entered training camp competing for one of the vacant starting cornerback jobs after Jimmie Ward was moved to free safety and Tramaine Brock was released following a domestic violence incident.

Head coach Kyle Shanahan named him the starting cornerback opposite Dontae Johnson to begin the 2017 season.

[17] Robinson started the 49ers' season-opener against the Panthers and recorded four combined tackles and recovered a fumble after forcing it from Christian McCaffrey in the fourth quarter in a 3–23 loss.

Robinson was suspended indefinitely from LSU's football team midway through the 2014 season due to a failed drug test and substandard academics.