Hi Anjum,
At this moment TI does not offer a dual channel bipolar output regulator. Even all our single channel negative output regulators require a negative input.
You could visit TI's WEBENCH tool for suggestions on how to design a dual bipolar output supply
http://webench.ti.com/webench5/power/webench5.cgi?app=powerarchitect&lang_chosen=en_US
Please let me know if you have any more questions.
Regards,
Kartik