Figure 14 on the Texas Instruments datasheet is the most important information to refer to. There is a limited current available and an issue with overheating if too much current is drawn. That is why the x axis of the graph is the "duty cycle" - the % time that the current is flowing. If only one output is on and it is properly on, that is, not being driven by p.w.m. or suchlike, then the graph recommends that it should not draw more than about 330mA. If you have two switched on, the total current flow should not 200mA per pin. And so forth. So you should be fine with 4 outputs at 100mA each, all on at the same time, according to the graph.I was thinking 5 20mA LEDs would draw 100mA so if I had 2 outputs live the draw would be 200mA. total.