The AT9452 is a monolithic, step-down, switch-mode converter with a built-in power MOSFET. It achieves a 1.0A peak-output current over a wide input voltage range. Current mode operation provides a fast transient response and eases loop stabilization. The wide input voltage range (5V to 40V) provides high efficiency output of 1.0A current. Low shutdown mode quiescent current of 2mA (or less) is suitable for battery-powered applications. High efficiency at light load condition is achieved by scaling down the switching frequency to reduce the switching and gate driving losses. The frequency folding technique helps prevent the inductance current from running out of control at startup. Hot shutdown provides reliable, fault tolerant operation.