Is the battery only powering the PSoC ? How are the heaters going to be powered and for how long ? I don't think that Li-ion battery is sufficient for your application. Regarding driving circuit, you can find mosfet driving circuits on net for your application. The circuit will dependent upon your driving circuit( whether its a switching type or not).
Thank you so much for your reply.
The battery should power both. I only need to power the heaters one at a time for 5 seconds only. You don't think this is doable with only one battery?
What driving circuit would you suggest, please?