According to the PT2272 data sheet at www.princeton.com.tw/portals/0/product/pt2272.pdf the decoder outputs can drive only a few milliamps. You need a simple driver, like a 2N7000. Connect the data output to the gate of the 2N7000, the 2N7000 source to ground, and its drain to the motor negative lead. The motor positive lead goes to +5V. If the motor draws more than about 1 amp the 2N7000 will burn up, so use a FET with a higher drain current rating. It is a good idea to put a diode like a 1N4007 across the motor, with the diode cathode connected to +5V. This will supress voltage spikes that might be generated by the motor's inductance, which could damage the FET.