Hi,
I guess not every part has a Spice model because - if you stop to think of semiconductor to mathematical model that will cover every simulation scenario it may be used under - they must be horrendously hard to make realistic, and let's consider the time-invested in making a model for its ROI... Even "simple" transformers are far from fun to simulate with and I understand extremely hard to model.
One approach, but may take more time than you may be able to or want to invest, is to consider the "functional block diagram" on page 9 and make a discrete version in TINA, then use the insert block option to make your own version of the IC, accepting that it may not be a perfect approximation but at least a reasonable guide to whatever it is you need to see in a simulation.
How about buying a PDIP version to prototype/breadboard with it? Sometimes, there's no other choice.
I see it's similar in functionality to the 7660 charge pump inverter IC. Could you scour the Internet to find a Spice model of any similar charge pump inverter IC as a drop-in substitute?
If you're looking for a perfect match, woe is you, I suspect. Due to a variety of issues I've found through time, including no model available or very rarely a model looking suspiciously rubbish and not especially realistic based on real-world use, as you'll know, sometimes it's better to break a simulation down into several parts and invent an equivalent solution to fill the gap, and then cross fingers and have to waste money on a sacrificial part in a prototype.
Good luck.