RESHC/2019/048

​This project proposal presents a power management solution for Internet of Things (IoT), wearable devices or other applications, which is an ultra-low quiescent current (<200nA) DC-DC step-down converter. The DC-DC is having three modes to obtain high efficiency over wide output current range and ultra-low quiescent current characteristics: 1) pulse width modulation (PWM) for medium to heavy load, 2) slow clock pulse frequency modulation (SCPFM) and fast clock pulse frequency modulation (FCPFM) for light to medium load, and 3) SCPFM and FCPFM with asynchronous control (ASC) for standby mode to ultra-light load. A low power bandgap voltage reference will be designed to reduce the power consumption and quiescent current especially during standby mode to light load situation. A power supply window for zero current detector (PSW-ZCD) during discontinuous conduction mode (DCM) control can be designed to improve the efficiency in DCM. The DC-DC output voltage can be changed by user between 0.8V, 1.2V, 1.8V and 3V. At the same time, the output current can cover a wide range scale from 1µA to 200mA with high power efficiency (peak efficiency >96%), small output voltage ripple and fast transient response, which is comparable with the state-of-the-art research works and existing products.

• Study the operational principle of bandgap voltage reference and DC-DC Converter

• Study and design a compensation circuit for bandgap voltage reference and DC-DC Converter

• Implementation and Cadence simulation verification of the design bandgap voltage reference / DC-DC converter in 65nm CMOS technology.

A paper preparation for the work and will present in an International Conference.