  In the framework of a QCD relativistic potential model we evaluate the form
factors describing the exclusive decay B => \pi\pi \ell \nu. The calculation is
performed in a phase space region far away from the resonances and therefore is
complementary to other decay mechanisms where the pions are produced by
intermediate particles, e.g. in the chiral approach. We give an estimate of the
contribution of the non resonant channel of the order of BR(B- => \pi+ \pi-
\ell \nu) \approx 2.2 x 10^(-4).
