analog 0-5v

I have 0-5vdc analog output but only good for 20ma, I need a isolation amplifier that I can input 0-5v and output 0-5v but up to 300ma. Does anyone know of any such device, I found this DIN1X1-ISO-L-U1-P1-O4 but its in china. I was wondering maybe op amp but I forgot my schooling

thanks, new guy to site