  We study the observational predictions of the phenomenological AdS/QCD
inspired model, in which the inflaton field emerges in a four dimensional
strongly coupled gauge theory, in which the chiral symmetry breaking occurs
through the formation of quark condensate. Based on a top-down approach of
AdS/QCD, using a D7 brane in the background of $N_c$ D3 branes, it has already
been shown that chiral symmetry breaking in a magnetic field through the
generation of Higgs vacuum expectation value could be a second order phase
transition, although it was doubted that this scenario could lead to enough
amount of inflation. Using an iterative method, we consistently solve for the
time-dependent parameters, including the embedding function of the D7 brane and
the Hubble parameter of the expanding background. We show that with $N_c\sim
10^7$ and $g_{\rm{}_{UV}}\sim {\rm few}\times 0.1$, the predictions of the
inflationary model is consistent with the most stringent constraints placed on
the inflationary models by Planck 2018. Although the model is capable of
producing a large amount of gravitational waves, $r\simeq 0.01$, the
displacement of the canonical mass dimension one scalar field remains below the
Planck mass, in violation of the Lyth bound.
