With increasing control applications in large-scale distributed and networked systems, the impact of uncertain time delay is ever-increasing. This paper proposes the use of a novel non-parametric Integral Quadratic Constraint (IQC) to achieve robustness against uncertain time delays. The proposed IQC is then integrated into a frequency-domain controller synthesis approach for robustness guarantees. Numerical simulation of an active suspension system within an intra-car network shows the effectiveness of the proposed method.