Fully-integrated DCDC buck converter based on PID algorithm

Abstract

With the continuous development of power supply technology, the application of power management chips becomes more extensive, and the requirements for fully integrated power management chips are getting higher. This paper designs a buck converter with a fully integrated digital control circuit and power circuit with an output voltage of 2V. In voltage mode, digital pulse width modulation (DPWM) technology and PID algorithm are used, and a digital closed-loop control buck circuit system is designed by cadence tools. The performance of analog and digital closed-loop control circuits is compared at the same buck power stage. Under rated load conditions, the lock-up time of the digital control buck circuit is 826us, the output voltage ripple is 14.75mV, the response time of load sudden change at light load is about 900us, and the response time of load sudden change at heavy load is about 2ms.