A 464-nA Quiescent Current Buck Converter With 93.7% Peak Efficiency for IoT Devices

This article presents a low-quiescent current, high-efficiency buck converter. A dynamic pulse frequency modulation control with adaptive off-time was proposed to increase efficiency. An ultra-low power system can be achieved with minimized quiescent current in each block and a low-power bandgap reference. The entire proposed buck converter consumed a quiescent current of 464 nA with a peak efficiency of 93.7$%$ over the load range from 0 to 50 mA. In addition, a maximum converter output ripple of only 28 mV was achieved at this ultra-low quiescent current.