I am not aware of a pinyin dictionary, perhaps others out there are.
If you google pinyin converter you will find lots of resources to convert our lessons to pinyin to help you. We will in the future provide a pinyin version for our beginner texts but I cannot tell you when.
The LingQing and dictionary resources will continue to be based on characters. We have no immediate plans to change this.
Sorry if LingQ does not suit your style of studying.