As far as I know no company will pay you maternity leave if you are intending not to come back. The idea behind it is for you to rest up after the birth then come back to work.

At my work we get 6 weeks paid leave and the policy states if you are not intending to come back don't take it. If employed under 5 years at my company you have to pay the company back if you don't return. It's not the best way to spend a big chunk of your baby bonus. If like me you have been employed over 5 years you don't have to pay it back, so in my case I could decide to not return without worrying about repayment.