We study the asymptotic behaviour, as
$p\to 1^+$
, of the solutions of the following inhomogeneous Robin boundary value problem:
P
\begin{equation*} \begin{cases} \displaystyle -\Delta_p u_p = f & \text{ in }\Omega,\\ \displaystyle |\nabla u_p|^{p-2}\nabla u_p\cdot \nu +\lambda |u_p|^{p-2}u_p = g & \text{ on } \partial\Omega, \end{cases} \end{equation*}
where
$\Omega$
is a bounded domain in
$\mathbb {R}^{N}$
with sufficiently smooth boundary,
$\nu$
is its unit outward normal vector and
$\Delta _p v$
is the
$p$
-Laplacian operator with
$p>1$
. The data
$f\in L^{N,\infty }(\Omega )$
(which denotes the Marcinkiewicz space) and
$\lambda,\,g$
are bounded functions defined on
$\partial \Omega$
with
$\lambda \ge 0$
. We find the threshold below which the family of
$p$
–solutions goes to 0 and above which this family blows up. As a second interest we deal with the
$1$
-Laplacian problem formally arising by taking
$p\to 1^+$
in (P).