LT1010 (Unitay Gain Buffer) - Voltage output depends on load? (LTSpice simulation)
Look at the negative saturation voltage curve in the datasheet. If you operate this part with a single supply, the output won't be able to swing to ground. At 25C with 150mA load you will only be able to get down to about 2.9V. This isn't really meant for digital applications like this, you should look for a high current digital buffer or maybe a discrete circuit.